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#41
Posted to sci.electronics.repair,uk.d-i-y
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AVO 8 Mk 4 ...
"Robin" wrote in message ... I just went and looked at a BAMA mirror site, and lo ! I have found a file that says it's for the Mk IV. I've downloaded it, but now need to find some software to open it. It says that it is .DJVU format ?? The site has links to viewers: see eg http://bama.edebris.com/manuals/avo FWIW I use Irfan. And you will need then the djvu plug-in (from the same site). But I am sorry to have to tell you that if you have downloaded mk4elect.djvu it is the manual for the Avo Electronic Testmeter Mark 4. (I know 'cos I got some of my manuals from BAMA and looked there yesterday when you first asked: I am *really* looking for excuses not to get back to crawling around in the loft!) -- Robin PM may be sent to rbw0{at}hotmail{dot}com I got me a viewer (I actually have Irfan as well, but didn't realise it did these djvu's) and yes, you are quite right, it is the wrong one, even though it appears to be listed as one of the 8's. Anyways, meter is now fixed - see my later post ! :-) Arfa |
#42
Posted to sci.electronics.repair,uk.d-i-y
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AVO 8 Mk 4 ...
"Meat Plow" wrote in message news On Sat, 02 Apr 2011 10:45:22 +0100, Arfa Daily wrote: "Meat Plow" wrote in message news On Fri, 01 Apr 2011 21:46:53 +0100, Arfa Daily wrote: "Robin" wrote in message ... Arfa Daily wrote: Anybody got a copy of the schematic that's in the back of the user guide that they can scan for me, please ? I've searched all my files and drawers high and low, and can't find my book anywhere ... I thought that the 'net would be awash with copies of the schematic, but it seems only for the Mk 2, which is totally different to the MK 4. TIA Is it the circuit diagram at http://www.radiomuseum.org/r/avo_uni...er_8_mk_i.html ? (Registration necessary for download. I have not done it as mine's a Mk II.) -- Robin PM may be sent to rbw0{at}hotmail{dot}com Hi Robin, thanks for that. It would appear to be the correct one. Looks as though you need to pay to become a member, so I will hold off for now until all the feelers that I have out, run dry. It's really annoying because I have owned the meter from new when I was an apprentice, and I have the book, which has the schematic in it, carefully filed away somewhere, but I'm buggered if I can now find it. It is in a box file, but said boxfile is not where I know it should be. Even more annoying is that I have damaged the meter by my own stupidity, so now have the need to fix it ... :-( Arfa That's too bad. I have some old gear I used as an apprentice that have a high value in the nostalgia department. An old EICO 232 VTVM, B&K 1801 freq. counter, Beckman Tech 310 DVM, Amprobe Amp Clamp and some other things that I can't think of right now. Yes, Meat. It's very frustrating. I cut my 'professional' teeth with that meter, and it has served me faithfully over the years without serious mishap. It is still in weekly use, but not quite the daily use that it once was. For some types of repair, the swinging needle of a quality instrument like this, is so much more appropriate than a digital type ... Arfa -- I got used to the LCD after using one for 25 years but it took awhile after using the EICO and a Simpson. The Beckman 310 was the first LCD I owned. I found a benchtop Beckman with LED's back in the 90's I used for several years before it failed beyond repair. Now using my faithful Fluke 77. This is one that had a touch hold button in the middle of the selector. It's hard to put aside the tools you've learned to trust after decades. Indeed it is. I have a hand portable DMM that is now the main workshop workhorse, and I am very easy with it. I also have a bench true RMS 6 digit job that is used fairly rarely. The AVO still gets used where I feel it is the appropriate instrument for the job. I tend to be happier using it around tube circuitry for measuring volts, and I prefer its ohms ranges for measuring semiconductor junctions, even though the DMM has a diode test facility Arfa |
#43
Posted to sci.electronics.repair,uk.d-i-y
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AVO 8 Mk 4 ...
On Sun, 3 Apr 2011 02:02:32 +0100, "Arfa Daily"
wrote: "Meat Plow" wrote in message news On Sat, 02 Apr 2011 10:45:22 +0100, Arfa Daily wrote: "Meat Plow" wrote in message news On Fri, 01 Apr 2011 21:46:53 +0100, Arfa Daily wrote: "Robin" wrote in message ... Arfa Daily wrote: Anybody got a copy of the schematic that's in the back of the user guide that they can scan for me, please ? I've searched all my files and drawers high and low, and can't find my book anywhere ... I thought that the 'net would be awash with copies of the schematic, but it seems only for the Mk 2, which is totally different to the MK 4. TIA Is it the circuit diagram at http://www.radiomuseum.org/r/avo_uni...er_8_mk_i.html ? (Registration necessary for download. I have not done it as mine's a Mk II.) -- Robin PM may be sent to rbw0{at}hotmail{dot}com Hi Robin, thanks for that. It would appear to be the correct one. Looks as though you need to pay to become a member, so I will hold off for now until all the feelers that I have out, run dry. It's really annoying because I have owned the meter from new when I was an apprentice, and I have the book, which has the schematic in it, carefully filed away somewhere, but I'm buggered if I can now find it. It is in a box file, but said boxfile is not where I know it should be. Even more annoying is that I have damaged the meter by my own stupidity, so now have the need to fix it ... :-( Arfa That's too bad. I have some old gear I used as an apprentice that have a high value in the nostalgia department. An old EICO 232 VTVM, B&K 1801 freq. counter, Beckman Tech 310 DVM, Amprobe Amp Clamp and some other things that I can't think of right now. Yes, Meat. It's very frustrating. I cut my 'professional' teeth with that meter, and it has served me faithfully over the years without serious mishap. It is still in weekly use, but not quite the daily use that it once was. For some types of repair, the swinging needle of a quality instrument like this, is so much more appropriate than a digital type ... Arfa -- I got used to the LCD after using one for 25 years but it took awhile after using the EICO and a Simpson. The Beckman 310 was the first LCD I owned. I found a benchtop Beckman with LED's back in the 90's I used for several years before it failed beyond repair. Now using my faithful Fluke 77. This is one that had a touch hold button in the middle of the selector. It's hard to put aside the tools you've learned to trust after decades. Indeed it is. I have a hand portable DMM that is now the main workshop workhorse, and I am very easy with it. I also have a bench true RMS 6 digit job that is used fairly rarely. The AVO still gets used where I feel it is the appropriate instrument for the job. I tend to be happier using it around tube circuitry for measuring volts, and I prefer its ohms ranges for measuring semiconductor junctions, even though the DMM has a diode test facility Arfa It's what you are used to. I started out with an AVO 7 I think it was 500 Ohms per Volt. It certainly had an effect on circuits even in the days before CMOS. I could turn on transistors and generally interact with circuits using it. Although a tool no doubt aimed at Electrical Engineers it proved a useful diagnostic instrument in an electronics environment. Oddly enough the AVO eight was potentially more accurate than todays digital afferings. At 20 K to the Volt, The AVO took half the current of the modern DMM. It was a dashed big needle to shift too. My gripe with the AVO was that although it was a robust instrument, you could buy around fifteen less robust meters for the same price. Similar accuracy, smaller scale though and at a major price reduction. Plus of course the fact that you could buy batteries to keep the Ohm fires burning at your local newsagent. I seem to recollect tht The AVO needed some kind of battery / inverter replacement when Ever Ready stopped producing their very expensive box of volts. Incidentally the final AVOs were not robust. They weighed about as much as two of the £12-00 Tandy meters that I used to use at that time. That was prety light! I zapped a new AVO with one jab at a line output valve topcap. Around 800 V p-p at 15 khz. I still operate using the same philosophy today. I can pay a hundred or so for a Fluke, or throw £20-00 across the counter at Maplin. Both meters do the same at an acceptable accuracy and both share the same fate when I forget to go from mA to volts when measuring across phases. Both meters also tend to go green & gungy when exposed to liquids. At least I do not feel too bad with a defunct £20-00 Tandy HN |
#44
Posted to sci.electronics.repair,uk.d-i-y
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AVO 8 Mk 4 ...
Mike Tomlinson writes:
In article , Arfa Daily writes Even more annoying is that I have damaged the meter by my own stupidity Measured the resistance of the mains? You too, eh? But they are indeed tough beasts; apart from a shaky ohms-adjust pot it's still working 25 years later. Doubtful if you could do that with a modern DVM and get away with it. -- Windmill, Use t m i l l @ O n e t e l . c o m |
#46
Posted to sci.electronics.repair,uk.d-i-y
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AVO 8 Mk 4 ...
In message , Arfa Daily
writes "Robin" wrote in message ... I just went and looked at a BAMA mirror site, and lo ! I have found a file that says it's for the Mk IV. I've downloaded it, but now need to find some software to open it. It says that it is .DJVU format ?? The site has links to viewers: see eg http://bama.edebris.com/manuals/avo FWIW I use Irfan. And you will need then the djvu plug-in (from the same site). But I am sorry to have to tell you that if you have downloaded mk4elect.djvu it is the manual for the Avo Electronic Testmeter Mark 4. (I know 'cos I got some of my manuals from BAMA and looked there yesterday when you first asked: I am *really* looking for excuses not to get back to crawling around in the loft!) -- Robin PM may be sent to rbw0{at}hotmail{dot}com I got me a viewer (I actually have Irfan as well, but didn't realise it did these djvu's) and yes, you are quite right, it is the wrong one, even though it appears to be listed as one of the 8's. Anyways, meter is now fixed - see my later post ! :-) You can get your own DJVU maker (+viewer) here (and several other interesting things): http://www.tuberadio.it/ http://www.tuberadio.it/utils.htm http://www.tuberadio.it/download/dvs31.exe -- Ian |
#47
Posted to sci.electronics.repair,uk.d-i-y
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AVO 8 Mk 4 ...
"Arfa Daily" wrote in message ... "Robin" wrote in message ... I just went and looked at a BAMA mirror site, and lo ! I have found a file that says it's for the Mk IV. I've downloaded it, but now need to find some software to open it. It says that it is .DJVU format ?? The site has links to viewers: see eg http://bama.edebris.com/manuals/avo FWIW I use Irfan. And you will need then the djvu plug-in (from the same site). But I am sorry to have to tell you that if you have downloaded mk4elect.djvu it is the manual for the Avo Electronic Testmeter Mark 4. (I know 'cos I got some of my manuals from BAMA and looked there yesterday when you first asked: I am *really* looking for excuses not to get back to crawling around in the loft!) -- Robin PM may be sent to rbw0{at}hotmail{dot}com I got me a viewer (I actually have Irfan as well, but didn't realise it did these djvu's) Can't remember the exact reason why I stopped using Irfanview for DJVU and went back to the original publishers browser pluggin but the most recent download of DJVU certainly works much better than earlier versions. |
#48
Posted to sci.electronics.repair,uk.d-i-y
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AVO 8 Mk 4 ...
"H. Neary" wrote in message ... On Sun, 3 Apr 2011 02:02:32 +0100, "Arfa Daily" wrote: "Meat Plow" wrote in message news On Sat, 02 Apr 2011 10:45:22 +0100, Arfa Daily wrote: "Meat Plow" wrote in message news On Fri, 01 Apr 2011 21:46:53 +0100, Arfa Daily wrote: "Robin" wrote in message ... Arfa Daily wrote: Anybody got a copy of the schematic that's in the back of the user guide that they can scan for me, please ? I've searched all my files and drawers high and low, and can't find my book anywhere ... I thought that the 'net would be awash with copies of the schematic, but it seems only for the Mk 2, which is totally different to the MK 4. TIA Is it the circuit diagram at http://www.radiomuseum.org/r/avo_uni...er_8_mk_i.html ? (Registration necessary for download. I have not done it as mine's a Mk II.) -- Robin PM may be sent to rbw0{at}hotmail{dot}com Hi Robin, thanks for that. It would appear to be the correct one. Looks as though you need to pay to become a member, so I will hold off for now until all the feelers that I have out, run dry. It's really annoying because I have owned the meter from new when I was an apprentice, and I have the book, which has the schematic in it, carefully filed away somewhere, but I'm buggered if I can now find it. It is in a box file, but said boxfile is not where I know it should be. Even more annoying is that I have damaged the meter by my own stupidity, so now have the need to fix it ... :-( Arfa That's too bad. I have some old gear I used as an apprentice that have a high value in the nostalgia department. An old EICO 232 VTVM, B&K 1801 freq. counter, Beckman Tech 310 DVM, Amprobe Amp Clamp and some other things that I can't think of right now. Yes, Meat. It's very frustrating. I cut my 'professional' teeth with that meter, and it has served me faithfully over the years without serious mishap. It is still in weekly use, but not quite the daily use that it once was. For some types of repair, the swinging needle of a quality instrument like this, is so much more appropriate than a digital type ... Arfa -- I got used to the LCD after using one for 25 years but it took awhile after using the EICO and a Simpson. The Beckman 310 was the first LCD I owned. I found a benchtop Beckman with LED's back in the 90's I used for several years before it failed beyond repair. Now using my faithful Fluke 77. This is one that had a touch hold button in the middle of the selector. It's hard to put aside the tools you've learned to trust after decades. Indeed it is. I have a hand portable DMM that is now the main workshop workhorse, and I am very easy with it. I also have a bench true RMS 6 digit job that is used fairly rarely. The AVO still gets used where I feel it is the appropriate instrument for the job. I tend to be happier using it around tube circuitry for measuring volts, and I prefer its ohms ranges for measuring semiconductor junctions, even though the DMM has a diode test facility Arfa It's what you are used to. I started out with an AVO 7 I think it was 500 Ohms per Volt. It certainly had an effect on circuits even in the days before CMOS. I could turn on transistors and generally interact with circuits using it. Although a tool no doubt aimed at Electrical Engineers it proved a useful diagnostic instrument in an electronics environment. Oddly enough the AVO eight was potentially more accurate than todays digital afferings. At 20 K to the Volt, The AVO took half the current of the modern DMM. It was a dashed big needle to shift too. My gripe with the AVO was that although it was a robust instrument, you could buy around fifteen less robust meters for the same price. Similar accuracy, smaller scale though and at a major price reduction. Plus of course the fact that you could buy batteries to keep the Ohm fires burning at your local newsagent. I seem to recollect tht The AVO needed some kind of battery / inverter replacement when Ever Ready stopped producing their very expensive box of volts. Had that problem with my Taylor meter - I wound a blocking oscillator coil on a small toroid and simply shunted the output with a 30V zener, its connected via a pushbutton to the 1.5V low Ohms battery. |
#49
Posted to sci.electronics.repair,uk.d-i-y
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AVO 8 Mk 4 ...
"Windmill" wrote in message ... Mike Tomlinson writes: In article , Arfa Daily writes Even more annoying is that I have damaged the meter by my own stupidity Measured the resistance of the mains? You too, eh? But they are indeed tough beasts; apart from a shaky ohms-adjust pot it's still working 25 years later. Doubtful if you could do that with a modern DVM and get away with it. My first ever DMM was fished out of the bin where I worked at the time, Ohms & ACV didn't work. When I opened it there was an OP-AMP in the middle of the PCB - it was sort of easiest to try replacing that and it actually fixed the fault! The employer very kindly loaned me a recently calibrated instrument and an assortment of adjustable PSUs and resistance decade boxes so I could make the neccessary adjustments to the presets next to the OP-AMP. I still have it but its been relegated to the shed for occasional automotive work. |
#51
Posted to sci.electronics.repair,uk.d-i-y
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AVO 8 Mk 4 ...
"JW" wrote in message
... On Sun, 3 Apr 2011 05:27:44 GMT lid (Windmill) wrote in Message id: : Mike Tomlinson writes: In article , Arfa Daily writes Even more annoying is that I have damaged the meter by my own stupidity Measured the resistance of the mains? You too, eh? But they are indeed tough beasts; apart from a shaky ohms-adjust pot it's still working 25 years later. Doubtful if you could do that with a modern DVM and get away with it. Not a cheap one maybe. My bench meter is a Keithley 2000 that will take 1KV peak when in resistance mode. Not that I'd do it on purpose, though... A Fluke 80 series III or later can survive this - not sure about the original 80 series. I wouldn't do it intentionally just to prove a point, though... Mark Z. |