Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
My hamfest special Fluke 80 something series something 20 year old meter
started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. |
#2
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"Cydrome Leader" wrote in message ... My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. I have been using a CEN-TECH P98674 DMM with an external temperature sensor. It is kind of flimsy (the sensor) so I have been careful when using it. I will not stick it into the shower! I own 2 Fluke DMMs and they are both flaky. Good luck! |
#3
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Cydrome Leader wrote:
My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke does not make meters like they used to any more. Actually, I don't think they make them in the US any more. The last I heard, they are all made in china now.. For a while, they were having the low ends made in china and kept the upper models where ever they were doing it the last time. Then, that changed and all of it is now chinese made.. That's what the sales rep told us. We have a Fluke 289 that was not made in china. Couple of the guys wanted a 289 so when theirs came in, those were made in china and you can see the difference in the case and switch action, they are not the same quality.. It does not surprise me that you have found that design flaw.. You most likely got a chinese designed version in a case that mimics the original fluke and approved by fluke, which is nothing more than an office and web sight, as far as I can see. Jamie |
#4
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"Cydrome Leader" wrote in message ... My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. NOT per http://www.youtube.com/watch?v=CMV7E186_Nw&feature=plcp |
#5
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
On Mon, 3 Sep 2012 20:08:54 +0000 (UTC), Cydrome Leader
wrote: Got a spiffy 87 series V meter from Specialized. Oh-oh. If you have one of the older units, you may have RF susceptibility problems, which includes clearing the flash and bricking the meter (15min): http://www.eevblog.com/2010/09/18/eevblog-112-gsm-vs-the-fluke-87v-multimeter/ and the fixed version (18min): http://www.eevblog.com/2011/07/11/eevblog-185-fluke-87v-multimeter-gsm-fix/ Old and new versions comparison: http://www.flickr.com/photos/eevblog/sets/72157627120630430/ or just listen to the beep. The old model has a rather loud beep. The new version has a much quieter beep. Also, the new one comes with shrouded probe tips. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#6
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Jamie t wrote:
Cydrome Leader wrote: My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke does not make meters like they used to any more. Actually, I don't think they make them in the US any more. The last I heard, they are all made in china now.. From what little experience I have with the new meter vs the one from decaces ago, I'm going to agree. This one is assembled in the US, like my old one though. For a while, they were having the low ends made in china and kept the upper models where ever they were doing it the last time. Then, that changed and all of it is now chinese made.. That's what the sales rep told us. We have a Fluke 289 that was not made in china. Couple of the guys wanted a 289 so when theirs came in, those were made in china and you can see the difference in the case and switch action, they are not the same quality.. It does not surprise me that you have found that design flaw.. You most likely got a chinese designed version in a case that mimics the original fluke and approved by fluke, which is nothing more than an office and web sight, as far as I can see. It's a legit Fluke meter bought in the last 6 months from a valid distributor. It's still preposterous that the slightest amount of moisture causes it to think the leads are in the wrong sockets or that you need to spray WD-40 all over the ****ing thing. |
#7
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Jeff Liebermann wrote:
On Mon, 3 Sep 2012 20:08:54 +0000 (UTC), Cydrome Leader wrote: Got a spiffy 87 series V meter from Specialized. Oh-oh. If you have one of the older units, you may have RF susceptibility problems, which includes clearing the flash and bricking the meter (15min): http://www.eevblog.com/2010/09/18/eevblog-112-gsm-vs-the-fluke-87v-multimeter/ and the fixed version (18min): http://www.eevblog.com/2011/07/11/eevblog-185-fluke-87v-multimeter-gsm-fix/ Old and new versions comparison: http://www.flickr.com/photos/eevblog/sets/72157627120630430/ or just listen to the beep. The old model has a rather loud beep. The new version has a much quieter beep. Also, the new one comes with shrouded probe tips. It's really hard to tell what the heck those photos are supposed to be, but I do have the one with the metal stub on the mode selection switch, which would be rev 11 or the new one, I think. So I just ran a test. power on meter with no leads. Great. I then dampened a qtip and squeezed it as dry as it can get as they're too fat to slide in the jack all the way when fluffed up. I jammed it into the uA range jack and the meter started the several beeps er second and LEAd (or whatever it looks like in 7-segment) freak out input protection mode. I stuck the other dry end of the qtip in the jack and it still won't settle down, even after being shut off and on. A second qtip still can't dry the jack enough. No amount of rotating or just straight up and down action with any number of qtips seems to dry the thing out enough to work again. The only ranges that act normal are mA and uA. From this photo http://www.flickr.com/photos/eevblog...7627120630430/ You can see there are two solder leads per jack. It seems that one side is the "working" terminal of the jack and the other is just for sensing when a probe is inserted because it will short out both pins. Inside the red plastic jack each half terminal is just a nearly semicircle shaped contact that wraps around almost half the banana-ish plug you's stick in there. Whatever they're sensing must be in the microvolts or microamps of leakage between those half terminals. Whatever it is, it's way over sensitive. |
#8
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"Cydrome Leader" wrote in message
... My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke will fix it for free or replace it under the warranty. Do not try to fix it yourself. I have some experience with Fluke Service. Although nobody is perfect, they are really the best in the business. If you needed a waterproof meter you should have bought a 28 series II, which has identical features. Mark Z. |
#9
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"Jamie" t wrote in message
... Cydrome Leader wrote: My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke does not make meters like they used to any more. Actually, I don't think they make them in the US any more. The last I heard, they are all made in china now.. For a while, they were having the low ends made in china and kept the upper models where ever they were doing it the last time. Then, that changed and all of it is now chinese made.. That's what the sales rep told us. We have a Fluke 289 that was not made in china. Couple of the guys wanted a 289 so when theirs came in, those were made in china and you can see the difference in the case and switch action, they are not the same quality.. It does not surprise me that you have found that design flaw.. You most likely got a chinese designed version in a case that mimics the original fluke and approved by fluke, which is nothing more than an office and web sight, as far as I can see. Jamie The Fluke 110 series (116, 117, etc) are Chinese made. The 80 series are all still U.S. made. Even the Chinese ones are made to high standards, but only carry a 3 year warranty, whereas the U.S. made models have the famous "lifetime" warranty. To my knowledge there are no Chinese - made 289's. Frankly somebody would have to prove this to me. I have a brand-new 289 and it is definitely American. Mark Z. |
#10
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"Cydrome Leader" wrote in message
... Jamie t wrote: Cydrome Leader wrote: My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke does not make meters like they used to any more. Actually, I don't think they make them in the US any more. The last I heard, they are all made in china now.. From what little experience I have with the new meter vs the one from decaces ago, I'm going to agree. This one is assembled in the US, like my old one though. For a while, they were having the low ends made in china and kept the upper models where ever they were doing it the last time. Then, that changed and all of it is now chinese made.. That's what the sales rep told us. We have a Fluke 289 that was not made in china. Couple of the guys wanted a 289 so when theirs came in, those were made in china and you can see the difference in the case and switch action, they are not the same quality.. It does not surprise me that you have found that design flaw.. You most likely got a chinese designed version in a case that mimics the original fluke and approved by fluke, which is nothing more than an office and web sight, as far as I can see. It's a legit Fluke meter bought in the last 6 months from a valid distributor. It's still preposterous that the slightest amount of moisture causes it to think the leads are in the wrong sockets or that you need to spray WD-40 all over the ****ing thing. Do not spray WD in there - but since it is necessary to open the unit to replace a fuse for example, you will not void the warranty simply by opening it. Once you do, your problem may be obvious. Perhaps there is more water inside than you realize - in which case you REALLY need to get in there and clean it out to prevent corrosion. Mark Z. |
#11
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"Cydrome Leader" wrote in message
... Jeff Liebermann wrote: On Mon, 3 Sep 2012 20:08:54 +0000 (UTC), Cydrome Leader wrote: Got a spiffy 87 series V meter from Specialized. Oh-oh. If you have one of the older units, you may have RF susceptibility problems, which includes clearing the flash and bricking the meter (15min): http://www.eevblog.com/2010/09/18/eevblog-112-gsm-vs-the-fluke-87v-multimeter/ and the fixed version (18min): http://www.eevblog.com/2011/07/11/eevblog-185-fluke-87v-multimeter-gsm-fix/ Old and new versions comparison: http://www.flickr.com/photos/eevblog/sets/72157627120630430/ or just listen to the beep. The old model has a rather loud beep. The new version has a much quieter beep. Also, the new one comes with shrouded probe tips. It's really hard to tell what the heck those photos are supposed to be, but I do have the one with the metal stub on the mode selection switch, which would be rev 11 or the new one, I think. So I just ran a test. power on meter with no leads. Great. I then dampened a qtip and squeezed it as dry as it can get as they're too fat to slide in the jack all the way when fluffed up. I jammed it into the uA range jack and the meter started the several beeps er second and LEAd (or whatever it looks like in 7-segment) freak out input protection mode. I stuck the other dry end of the qtip in the jack and it still won't settle down, even after being shut off and on. A second qtip still can't dry the jack enough. No amount of rotating or just straight up and down action with any number of qtips seems to dry the thing out enough to work again. The only ranges that act normal are mA and uA. From this photo http://www.flickr.com/photos/eevblog...7627120630430/ You can see there are two solder leads per jack. It seems that one side is the "working" terminal of the jack and the other is just for sensing when a probe is inserted because it will short out both pins. Inside the red plastic jack each half terminal is just a nearly semicircle shaped contact that wraps around almost half the banana-ish plug you's stick in there. Whatever they're sensing must be in the microvolts or microamps of leakage between those half terminals. Whatever it is, it's way over sensitive. Sorry if I responded too quickly to your earlier post if you've already opened it. Nevertheless, you should get it to Fluke for service. They really will fix it for free. I've even heard of many cases where they cover units not 'technically' under warranty, not original owner, no purchase documentation, etc. I'm assuming you are in the U.S. Their turnaround is usually about 2 weeks, including UPS both ways. 1-888-99-FLUKE (1-888-993-5853) Mark Z. |
#12
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Mark Zacharias wrote:
"Jamie" t wrote in message ... Cydrome Leader wrote: My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke does not make meters like they used to any more. Actually, I don't think they make them in the US any more. The last I heard, they are all made in china now.. For a while, they were having the low ends made in china and kept the upper models where ever they were doing it the last time. Then, that changed and all of it is now chinese made.. That's what the sales rep told us. We have a Fluke 289 that was not made in china. Couple of the guys wanted a 289 so when theirs came in, those were made in china and you can see the difference in the case and switch action, they are not the same quality.. It does not surprise me that you have found that design flaw.. You most likely got a chinese designed version in a case that mimics the original fluke and approved by fluke, which is nothing more than an office and web sight, as far as I can see. Jamie The Fluke 110 series (116, 117, etc) are Chinese made. The 80 series are all still U.S. made. Even the Chinese ones are made to high standards, but only carry a 3 year warranty, whereas the U.S. made models have the famous "lifetime" warranty. To my knowledge there are no Chinese - made 289's. Frankly somebody would have to prove this to me. I have a brand-new 289 and it is definitely American. Mark Z. we have at least 7 people in the shop using them and they're all chinese made, accept the one I have. It's possible you can still get US made ones. Our sales rep told us differently.. This reminds me of the Baldor micro AC drives we get, (VS1MD) series. if you go to their web sight and look at the advertised drive, they show a membrane keypad with a slightly different art design on the face. when you actually buy one, you get a chicklet push button keys and the front is just a plane jane control. It really does not matter but the point is, they are not shipping you what they advertise.. Also the ones we get are made in S.Korea. Jamie |
#13
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
On Tue, 4 Sep 2012 06:33:49 +0000 (UTC), Cydrome Leader
wrote: It's really hard to tell what the heck those photos are supposed to be, but I do have the one with the metal stub on the mode selection switch, which would be rev 11 or the new one, I think. Comparison of a Rev 9 meter with a prototype Rev 11 meter. So I just ran a test. You did the water test, not the RF susceptibility test. Find a GSM phone and see what it does. It wasn't my 87-V meter, but one of the techs on a mountain top radio site announced that his meter was dead and unusable anywhere near a source of RF. He sent it back to Fluke for repair. I think (not sure) it was replaced by a later model. As for waterproof, it appears that the 87-V is NOT waterproof. That's the newer type 28 meter. From this photo http://www.flickr.com/photos/eevblog...7627120630430/ You can see there are two solder leads per jack. It seems that one side is the "working" terminal of the jack and the other is just for sensing when a probe is inserted because it will short out both pins. Inside the red plastic jack each half terminal is just a nearly semicircle shaped contact that wraps around almost half the banana-ish plug you's stick in there. Reading from left to right on the above photo, that's: + terminal - terminal mA/uA Amps While the mA/uA and Amps terminals have split pin connections, the + and - terminals do not. I can see a possible problem with leakage across the split terminals, but not across the + and - which don't seem to have a sensor. My guess(tm) would be something is leaking across the PCB, possible from the two Amps terminals to ground or internal power. It might also be testing for any resistance between the two Amps terminals, or between the Amp terminals and the + terminal, which are unusable conditions. Whatever they're sensing must be in the microvolts or microamps of leakage between those half terminals. Whatever it is, it's way over sensitive. True. Find a tiny o-ring that fits into the connector and cram it down to the bottom until it seals the receptacle. That's should help. Incidentally, I have two Fluke meters (Model 10 and 73). No problems and well worth the money. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#14
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Mark Zacharias wrote:
"Cydrome Leader" wrote in message ... Jamie t wrote: Cydrome Leader wrote: My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke does not make meters like they used to any more. Actually, I don't think they make them in the US any more. The last I heard, they are all made in china now.. From what little experience I have with the new meter vs the one from decaces ago, I'm going to agree. This one is assembled in the US, like my old one though. For a while, they were having the low ends made in china and kept the upper models where ever they were doing it the last time. Then, that changed and all of it is now chinese made.. That's what the sales rep told us. We have a Fluke 289 that was not made in china. Couple of the guys wanted a 289 so when theirs came in, those were made in china and you can see the difference in the case and switch action, they are not the same quality.. It does not surprise me that you have found that design flaw.. You most likely got a chinese designed version in a case that mimics the original fluke and approved by fluke, which is nothing more than an office and web sight, as far as I can see. It's a legit Fluke meter bought in the last 6 months from a valid distributor. It's still preposterous that the slightest amount of moisture causes it to think the leads are in the wrong sockets or that you need to spray WD-40 all over the ****ing thing. Do not spray WD in there - but since it is necessary to open the unit to replace a fuse for example, you will not void the warranty simply by opening it. Once you do, your problem may be obvious. Perhaps there is more water inside than you realize - in which case you REALLY need to get in there and clean it out to prevent corrosion. Mark Z. Sadly there isn't anything else wrong with the meter. The sockets for the leads are single piece of sealed looking plastic, which is then o-ring sealed to the front bezel. There was no water splashing around inside the meter, which is what I expected at first. I ran another test. Turn on the meter and place is face down an inch or two over over a cup of warm tap water. Within seconds it sensed a lead errors. I have to see if my breath can trigger it next. |
#15
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Mark Zacharias wrote:
"Cydrome Leader" wrote in message ... My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke will fix it for free or replace it under the warranty. Do not try to fix it yourself. I have some experience with Fluke Service. Although nobody is perfect, they are really the best in the business. If you needed a waterproof meter you should have bought a 28 series II, which has identical features. Mark Z. I'm doubting the meter is "broken" in that it won't behave like any other one just like it. I don't need waterproof, just to know that the meter doesn't have water absorbent plastics in it and it won't completely stop working if my glasses fog up for a second when going to another room. The slightest trace of moisture doesn't seem to need to get past the jack itself, and it's not like I'm pouring water into the jacks. Maybe I need to make some rubber plugs for the damn thing. It reminds me of those horrible ceramic thick film resistor looking dew sensors in VCRs that always failed on their own. Just drawing on them with a pencil seemed to take care of that (not really sure how though). |
#16
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Cydrome Leader wrote:
Jamie t wrote: Cydrome Leader wrote: My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke does not make meters like they used to any more. Actually, I don't think they make them in the US any more. The last I heard, they are all made in china now.. From what little experience I have with the new meter vs the one from decaces ago, I'm going to agree. This one is assembled in the US, like my old one though. For a while, they were having the low ends made in china and kept the upper models where ever they were doing it the last time. Then, that changed and all of it is now chinese made.. That's what the sales rep told us. We have a Fluke 289 that was not made in china. Couple of the guys wanted a 289 so when theirs came in, those were made in china and you can see the difference in the case and switch action, they are not the same quality.. It does not surprise me that you have found that design flaw.. You most likely got a chinese designed version in a case that mimics the original fluke and approved by fluke, which is nothing more than an office and web sight, as far as I can see. It's a legit Fluke meter bought in the last 6 months from a valid distributor. It's still preposterous that the slightest amount of moisture causes it to think the leads are in the wrong sockets or that you need to spray WD-40 all over the ****ing thing. A big NO to WD-40 please! Instead use some Dow Corning Electrical Grease (#4 is what I like) on circuits that seem to be moisture sensitive. It is a water displacement grease, and non-corrosive and won't turn to glue/goo (as a certain heavily advertised produce already mentioned in this note will) over time. John :-#)# -- (Please post followups or tech enquiries to the newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#17
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
John Robertson wrote:
Cydrome Leader wrote: Jamie t wrote: Cydrome Leader wrote: My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke does not make meters like they used to any more. Actually, I don't think they make them in the US any more. The last I heard, they are all made in china now.. From what little experience I have with the new meter vs the one from decaces ago, I'm going to agree. This one is assembled in the US, like my old one though. For a while, they were having the low ends made in china and kept the upper models where ever they were doing it the last time. Then, that changed and all of it is now chinese made.. That's what the sales rep told us. We have a Fluke 289 that was not made in china. Couple of the guys wanted a 289 so when theirs came in, those were made in china and you can see the difference in the case and switch action, they are not the same quality.. It does not surprise me that you have found that design flaw.. You most likely got a chinese designed version in a case that mimics the original fluke and approved by fluke, which is nothing more than an office and web sight, as far as I can see. It's a legit Fluke meter bought in the last 6 months from a valid distributor. It's still preposterous that the slightest amount of moisture causes it to think the leads are in the wrong sockets or that you need to spray WD-40 all over the ****ing thing. A big NO to WD-40 please! Instead use some Dow Corning Electrical Grease (#4 is what I like) on circuits that seem to be moisture sensitive. It is a water displacement grease, and non-corrosive and won't turn to glue/goo (as a certain heavily advertised produce already mentioned in this note will) over time. I don't own WD-40 or duct tape for those reasons. I wish I was making up the WD-40 part, but it's actually in their manual. |
#18
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Cydrome Leader wrote:
John Robertson wrote: Cydrome Leader wrote: Jamie t wrote: Cydrome Leader wrote: My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. Fluke does not make meters like they used to any more. Actually, I don't think they make them in the US any more. The last I heard, they are all made in china now.. From what little experience I have with the new meter vs the one from decaces ago, I'm going to agree. This one is assembled in the US, like my old one though. For a while, they were having the low ends made in china and kept the upper models where ever they were doing it the last time. Then, that changed and all of it is now chinese made.. That's what the sales rep told us. We have a Fluke 289 that was not made in china. Couple of the guys wanted a 289 so when theirs came in, those were made in china and you can see the difference in the case and switch action, they are not the same quality.. It does not surprise me that you have found that design flaw.. You most likely got a chinese designed version in a case that mimics the original fluke and approved by fluke, which is nothing more than an office and web sight, as far as I can see. It's a legit Fluke meter bought in the last 6 months from a valid distributor. It's still preposterous that the slightest amount of moisture causes it to think the leads are in the wrong sockets or that you need to spray WD-40 all over the ****ing thing. A big NO to WD-40 please! Instead use some Dow Corning Electrical Grease (#4 is what I like) on circuits that seem to be moisture sensitive. It is a water displacement grease, and non-corrosive and won't turn to glue/goo (as a certain heavily advertised produce already mentioned in this note will) over time. I don't own WD-40 or duct tape for those reasons. I wish I was making up the WD-40 part, but it's actually in their manual. Ah, right, I have to READ all the text grin...overlooked that WD-40 was 'recommended' in the manual. A bit scary indeed! John :-#(# -- (Please post followups or tech enquiries to the newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#19
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"Jeff Liebermann" wrote in message
... snip down to the bottom until it seals the receptacle. That's should help. Incidentally, I have two Fluke meters (Model 10 and 73). No problems and well worth the money. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 I have a 85-III, an 87-V, a 27-II, an 8800A/AF, the new 289 and an 8840A. In my experience they have been absolutlely reliable, and in measurements there's not over about 400 microvolts difference on DC volts between them, even the 8800 produced around (?) 1975 and the 8840A made around 1986. Yes, I am a "multimeter junkie"... I have left my 87-V in my refrigerator for days on end getting min-max on temperature. It would get condensation when moved from the cold to a warm room, but never malfunctioned. I have not submerged any of them, but the 27-II is supposed to be waterproof... The 87-5 has split terminals for the current jacks - this may explain why the other fellow was getting the "leads" indication with moisture in there. Mark Z. |
#20
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Mark Zacharias wrote:
"Jeff Liebermann" wrote in message ... snip down to the bottom until it seals the receptacle. That's should help. Incidentally, I have two Fluke meters (Model 10 and 73). No problems and well worth the money. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 I have a 85-III, an 87-V, a 27-II, an 8800A/AF, the new 289 and an 8840A. In my experience they have been absolutlely reliable, and in measurements there's not over about 400 microvolts difference on DC volts between them, even the 8800 produced around (?) 1975 and the 8840A made around 1986. Yes, I am a "multimeter junkie"... I have left my 87-V in my refrigerator for days on end getting min-max on temperature. It would get condensation when moved from the cold to a warm room, but never malfunctioned. I have not submerged any of them, but the 27-II is supposed to be waterproof... The 87-5 has split terminals for the current jacks - this may explain why the other fellow was getting the "leads" indication with moisture in there. I just confirmed that just one breath like one would use to clean eyeglasses is enough to "short out" the small current range jack. Can anybody else try this? I'm going to ask fluke about this. |
#21
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"Cydrome Leader" wrote in message
... Mark Zacharias wrote: "Jeff Liebermann" wrote in message ... snip down to the bottom until it seals the receptacle. That's should help. Incidentally, I have two Fluke meters (Model 10 and 73). No problems and well worth the money. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 I have a 85-III, an 87-V, a 27-II, an 8800A/AF, the new 289 and an 8840A. In my experience they have been absolutlely reliable, and in measurements there's not over about 400 microvolts difference on DC volts between them, even the 8800 produced around (?) 1975 and the 8840A made around 1986. Yes, I am a "multimeter junkie"... I have left my 87-V in my refrigerator for days on end getting min-max on temperature. It would get condensation when moved from the cold to a warm room, but never malfunctioned. I have not submerged any of them, but the 27-II is supposed to be waterproof... The 87-5 has split terminals for the current jacks - this may explain why the other fellow was getting the "leads" indication with moisture in there. I just confirmed that just one breath like one would use to clean eyeglasses is enough to "short out" the small current range jack. Can anybody else try this? I'm going to ask fluke about this. I'm going to agree with you. I think that is a fault. I'm going to try it with mine. Mark Z. |
#22
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
On Wed, 5 Sep 2012 04:35:12 +0000 (UTC) Cydrome Leader
wrote in Message id: : [...] I just confirmed that just one breath like one would use to clean eyeglasses is enough to "short out" the small current range jack. Can anybody else try this? I'm going to ask fluke about this. Doesn't happen with mine. Serial # is 96800437. |
#23
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"ED" wrote in message ... "Cydrome Leader" wrote in message ... My hamfest special Fluke 80 something series something 20 year old meter started to act weird so it was time to upgrade. Got a spiffy 87 series V meter from Specialized. It's much larger than the old meter which is sort of a bummer, but it has a nice display and came with a cheapo temp probe. I tried to measure the temp of the shower water I like and few minutes later the meter started to freak out with "L38d" errors. It would not shut the hell up unless it was in the mA or uA range. So apparently the humidity condensed inside the lead sockets and shorted out the other side of the connector shell causing the meter to think I was stuck in a current range of some sort. a dry qtip wasn't able to dry the sockets out. Neither was pure alcohol, or a fan. I was about to get a RAM on the piece of ****, but finally, after about 20 minutes of being set in front of a fan, the thiung dried up enough to work again. I checked the service manual and found a strange section suggesting your spray a swab with WD-40 and work it around inside the lead sockets to prevent this problem. WTF. Is there some some secret settings I can enter on this meter to supress the input warnings, or is it time to unsolder half the connectors? Since the entire meter is semi sealed and had gaskets and orings all over, it seems stupid that a miniscule amout of moisture or a drop of water will completely disable the meter. I'm calling **** design on this one. NOT per http://www.youtube.com/watch?v=CMV7E186_Nw&feature=plcp Just another example of the sales bull**** not matching reality. |
#24
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"JW" wrote in message
... On Wed, 5 Sep 2012 04:35:12 +0000 (UTC) Cydrome Leader wrote in Message id: : [...] I just confirmed that just one breath like one would use to clean eyeglasses is enough to "short out" the small current range jack. Can anybody else try this? I'm going to ask fluke about this. Doesn't happen with mine. Serial # is 96800437. OK, I checked my 87-5. DOES NOT trigger the lead warning by any amount of close-up hot breathing into it. Also checked my 289 again to confirm "Made in America". It is, "of U.S. and non-U.S. components" - about as I expected. Mark Z. |
#25
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Mark Zacharias wrote:
"JW" wrote in message ... On Wed, 5 Sep 2012 04:35:12 +0000 (UTC) Cydrome Leader wrote in Message id: : [...] I just confirmed that just one breath like one would use to clean eyeglasses is enough to "short out" the small current range jack. Can anybody else try this? I'm going to ask fluke about this. Doesn't happen with mine. Serial # is 96800437. OK, I checked my 87-5. DOES NOT trigger the lead warning by any amount of close-up hot breathing into it. I got an RMA today for mine. The tech support guy was basically able to cut me off before I described the problem, and suggested I clean the jack with pure alcohol, which I tried already. That didn't work so it's going back. It was hinted it would take years of grime to build up on the jack before it acts weird, which obviously isn't the case. Also checked my 289 again to confirm "Made in America". It is, "of U.S. and non-U.S. components" - about as I expected. So it's back to the 73 series II for now I guess. I'm really curious as to what the resistance is between the "shorted" contacts, but I can't measure it without desoldering the jack, which would probably cancel any warranty work on the unit. |
#26
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
"Cydrome Leader" wrote in message
... Mark Zacharias wrote: "JW" wrote in message ... On Wed, 5 Sep 2012 04:35:12 +0000 (UTC) Cydrome Leader wrote in Message id: : [...] I just confirmed that just one breath like one would use to clean eyeglasses is enough to "short out" the small current range jack. Can anybody else try this? I'm going to ask fluke about this. Doesn't happen with mine. Serial # is 96800437. OK, I checked my 87-5. DOES NOT trigger the lead warning by any amount of close-up hot breathing into it. I got an RMA today for mine. The tech support guy was basically able to cut me off before I described the problem, and suggested I clean the jack with pure alcohol, which I tried already. That didn't work so it's going back. It was hinted it would take years of grime to build up on the jack before it acts weird, which obviously isn't the case. Also checked my 289 again to confirm "Made in America". It is, "of U.S. and non-U.S. components" - about as I expected. So it's back to the 73 series II for now I guess. I'm really curious as to what the resistance is between the "shorted" contacts, but I can't measure it without desoldering the jack, which would probably cancel any warranty work on the unit. DC resistance between split halves of current jacks on the 87-5 = 2.4 meg on the 85-3 it is 30 meg on mA jack, 25 meg on Amp jack .. The 289 appears to use optical sensing. Mark Z. |
#27
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Mark Zacharias wrote:
"Cydrome Leader" wrote in message ... Mark Zacharias wrote: "JW" wrote in message ... On Wed, 5 Sep 2012 04:35:12 +0000 (UTC) Cydrome Leader wrote in Message id: : [...] I just confirmed that just one breath like one would use to clean eyeglasses is enough to "short out" the small current range jack. Can anybody else try this? I'm going to ask fluke about this. Doesn't happen with mine. Serial # is 96800437. OK, I checked my 87-5. DOES NOT trigger the lead warning by any amount of close-up hot breathing into it. I got an RMA today for mine. The tech support guy was basically able to cut me off before I described the problem, and suggested I clean the jack with pure alcohol, which I tried already. That didn't work so it's going back. It was hinted it would take years of grime to build up on the jack before it acts weird, which obviously isn't the case. Also checked my 289 again to confirm "Made in America". It is, "of U.S. and non-U.S. components" - about as I expected. So it's back to the 73 series II for now I guess. I'm really curious as to what the resistance is between the "shorted" contacts, but I can't measure it without desoldering the jack, which would probably cancel any warranty work on the unit. DC resistance between split halves of current jacks on the 87-5 = 2.4 meg on the 85-3 it is 30 meg on mA jack, 25 meg on Amp jack . The 289 appears to use optical sensing. Interesting- I'll test resistance with HP 34401 (which has been mostly surprise free except for the really low input impedance of the AC ranges) before I ship it off. Yesterday was less humid in the house, and it took an extra puff to trigger the lead error, but it was still easy. Maybe the shroud of the jack uses a water absorbing plastic like nylon. |
#28
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Yesterday was less humid in the house, and it took an extra puff to
trigger the lead error, but it was still easy. Maybe the shroud of the jack uses a water absorbing plastic like nylon. Maybe there's some hygroscopic shmutz around the jacks. Have you thoroughly cleaned/flushed the area? |
#29
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
William Sommerwerck wrote:
Yesterday was less humid in the house, and it took an extra puff to trigger the lead error, but it was still easy. Maybe the shroud of the jack uses a water absorbing plastic like nylon. Maybe there's some hygroscopic shmutz around the jacks. Have you thoroughly cleaned/flushed the area? yeah, it's clean, plus it's basically new. I've not been dragging it around a steel mill or anything like that. |
#30
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Yesterday was less humid in the house, and it took an extra puff
to trigger the lead error, but it was still easy. Maybe the shroud of the jack uses a water-absorbing plastic like nylon. Maybe there's some hygroscopic shmutz around the jacks. Have you thoroughly cleaned/flushed the area? Yeah, it's clean, plus it's basically new. I've not been dragging it around a steel mill or anything like that. This has puzzled me ever since you first posted. CMOS is sensitive to surface contamination -- anything that's conductive, even only slightly including water. You might try hitting the area with freeze spray. This ought to reveal two things... First, is the problem caused simply by blowing on the board (ie, moisture has nothing to do with it). Second, the low temperature will cause moisture to condense. Does the problem occur after the spray has evaporated? If I had access to an ultrasound bath, I'd dunk the board in an inert solvent and clean it thoroughly. If that didn't clear the problem, I'd be surprised. |
#31
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
William Sommerwerck wrote:
Yesterday was less humid in the house, and it took an extra puff to trigger the lead error, but it was still easy. Maybe the shroud of the jack uses a water-absorbing plastic like nylon. Maybe there's some hygroscopic shmutz around the jacks. Have you thoroughly cleaned/flushed the area? Yeah, it's clean, plus it's basically new. I've not been dragging it around a steel mill or anything like that. This has puzzled me ever since you first posted. CMOS is sensitive to surface contamination -- anything that's conductive, even only slightly including water. I've decided not to mess with the inside of the meter itself. It's under warranty, and clearly screwing with it won't help me out in this case. The board itself looks clean- none of that white dust you see on crappy board with water based flux or whatever causes that. Just blowing on the jacks with the meter close will cause the lead error, although today it's harder as it's less humid out. Maybe there's some factory included contanmination on the PCB itself, so that the extra gigaohm of my breath is just too much for it. I did measure the resistance of the current jack, which was about 1.8M and it changed as if there was a cap in the sense circuit. There were visible 1M resistors connected to the sense side of the current jacks. You might try hitting the area with freeze spray. This ought to reveal two things... First, is the problem caused simply by blowing on the board (ie, moisture has nothing to do with it). Second, the low temperature will cause moisture to condense. Does the problem occur after the spray has evaporated? If I had access to an ultrasound bath, I'd dunk the board in an inert solvent and clean it thoroughly. If that didn't clear the problem, I'd be surprised. Fluke seemed keen on getting in for repair, so we'll see what they do to it. |
#32
Posted to sci.electronics.repair
|
|||
|
|||
obnoxious Fluke 87 V meter problem
Fluke seemed keen on getting in for repair, so we'll see
what they do to it. Please let us know. I like to hear solutions to odd problems. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Do I need a new Fluke clamp meter? | Electronics Repair | |||
Dead Fluke 37 meter | Electronics Repair | |||
Fluke 8600a meter repair | Electronics Repair | |||
Fluke scope meter PM97 | Electronics Repair | |||
Fluke meter recommendation | Electronics Repair |