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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. |
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#1
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Fluke 73III fluke repair
A couple years ago I bought a Fluke 73III at a yard sale for $20.
Such a deal, I thought. Everything seemed good for a short time, then I noticed when the leads were reversed a dc voltage would measure almost double, then the ohms reading was way off. I put the meter to the side and used a different one. Yesterday I found a schematic so I thought I'd look at it. Only found it because I was looking at purchasing a 87V on ebay. First thing, it didn't power up, I thought maybe I had removed the battery. I opened it, the battery is there, but I had trouble getting it to disconnect from the snaps, so I took the board loose to have more room. I then measured the voltage on the PCB, it was 5.5 volts, then I measured at the battery 9.1 volts. hmm. I ended up using diagonals cutters and prying the snap open to get the battery out. There was some corrosion. I installed a new battery connector and battery. All functions now work and are accurate, I have a calibration unit and used it to check the meter every way I could. I guess it was just a battery problem, but I never noticed a low battery indication. I'm happy. |
#2
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Fluke 73III fluke repair
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#3
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Fluke 73III fluke repair
Most Fluke meters have a lifetime warranty. Keep that in mind before doing major surgery.
Peter Wieck Melrose Park, PA |
#4
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Fluke 73III fluke repair
amdx wrote:
I guess it was just a battery problem, but I never noticed a low battery indication. Most other DVMs I've had would read accurately until the digits could no longer be read, LONG after the low-bat indication was on. At least one Fluke I had would start giving totally impossible readings as soon as the low-bat indicator showed. I guess there was less margin on the voltage reference. Kind of disappointing. Jon |
#5
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Fluke 73III fluke repair
On Sun, 20 Dec 2015 18:10:50 -0800 (PST), "
wrote: Most Fluke meters have a lifetime warranty. Keep that in mind before doing major surgery. Peter Wieck Melrose Park, PA Not exactly: http://www.fluke.com/fluke/iden/support/warranties/ Each Fluke 20*, 70*, 80*, 170 and 180 series DMM will be free from defects in material and workmanship for its lifetime. As used herein, "lifetime" is defined as seven years after Fluke discontinues manufacturing the product, but the warranty period shall be at least ten years from date of purchase. *(Lifetime Warranty applies to products manufactured after October 1996). The Fluke 73 iii shows as discontinued: http://en-us.fluke.com/products/electrical-testers/fluke-77-iii.html No dates, so I can't guess(tm) as to it's warranty status. Drivel: I found an old Fluke 8060A true RMS meter at a thrift shop. I fixed it (cleaned the LCD contacts) but now I can't find the three plastic screws that hold the case together. They're under the mess here somewhere. ARGH! -- 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
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Fluke 73III fluke repair
Jon Elson wrote:
Most other DVMs I've had would read accurately until the digits could no longer be read, LONG after the low-bat indication was on. At least one Fluke I had would start giving totally impossible readings as soon as the low-bat indicator showed. I guess there was less margin on the voltage reference. ** My rather old "Fluke 70 Series 2" displays the battery warning symbol at 6.4 volts - but still works fine to less than 5 volts. The LCD display is good down to 2.5V but readings are are crazy. ...... Phil |
#7
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Fluke 73III fluke repair
On 20/12/2015 23:26, amdx wrote:
A couple years ago I bought a Fluke 73III at a yard sale for $20. Such a deal, I thought. Everything seemed good for a short time, then I noticed when the leads were reversed a dc voltage would measure almost double, then the ohms reading was way off. I put the meter to the side and used a different one. Yesterday I found a schematic so I thought I'd look at it. Only found it because I was looking at purchasing a 87V on ebay. First thing, it didn't power up, I thought maybe I had removed the battery. I opened it, the battery is there, but I had trouble getting it to disconnect from the snaps, so I took the board loose to have more room. I then measured the voltage on the PCB, it was 5.5 volts, then I measured at the battery 9.1 volts. hmm. I ended up using diagonals cutters and prying the snap open to get the battery out. There was some corrosion. I installed a new battery connector and battery. All functions now work and are accurate, I have a calibration unit and used it to check the meter every way I could. I guess it was just a battery problem, but I never noticed a low battery indication. I'm happy. With my Fluke 77 I've had that, erroneous slightly off values and no low batt symbol, but was due to low battery |
#8
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Fluke 73III fluke repair
Jon Elson wrote:
amdx wrote: I guess it was just a battery problem, but I never noticed a low battery indication. Most other DVMs I've had would read accurately until the digits could no longer be read, LONG after the low-bat indication was on. At least one Fluke I had would start giving totally impossible readings as soon as the low-bat indicator showed. I guess there was less margin on the voltage reference. Kind of disappointing. The fluke meters I have are like that. It's really obnoxious, especially on my latest 87V. |
#9
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Fluke 73III fluke repair
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#10
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Fluke 73III fluke repair
"Cydrome Leader" wrote in message
... Jon Elson wrote: amdx wrote: I guess it was just a battery problem, but I never noticed a low battery indication. Most other DVMs I've had would read accurately until the digits could no longer be read, LONG after the low-bat indication was on. At least one Fluke I had would start giving totally impossible readings as soon as the low-bat indicator showed. I guess there was less margin on the voltage reference. Kind of disappointing. The fluke meters I have are like that. It's really obnoxious, especially on my latest 87V. I have a Fluke 28 series II and it's an amazing meter, exactly like my 87-5 in function, but it wastes a lot of battery capacity. AA cells get down to 1.4 volts and it's done. Not so bad really because you get those batteries out of there before they're likely to cause any corrosion. You can "test" the batteries using the backlight and the continuity beeper at the same time. If the batteries are at all marginal, you'll get an early indication. Mark Z. |
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