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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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2nd Nov 2020, 2:26 pm | #1 |
Diode
Join Date: Oct 2020
Location: Ayr, Scotland, UK.
Posts: 5
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AVO Model III
Hi Everyone,
I have just joined the forum, as I was looking for info on Avo's, which you have a lot of. Years ago in the misty past I owned & used AVO's daily. I decided I was sick of them new fangled digi stuff, so thought AVO Model ?? multimeter, so bought two Model III's untested. They arrive this week. Main question is - I noticed several comments to use copper / ssteel screw drivers etc due to magnets, is that correct and has anyone other recommendations on what to do or not do. Hope to clean at least on up and use other for spares etc if necessary. Any advice is welcome. Robert: idea: |
2nd Nov 2020, 3:05 pm | #2 |
Octode
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
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Re: AVO Model III
Hi Robert,
Welcome to the Forum. I assume you mean an Avo Model 8 Mk III here. A very capable and robust Meter, within reason. The use of non Magnetic Screwdrivers only really apply if you are working on or close to the Movement. You wouldn't need them for taking the Case off for example. Avoid any Metallic objects touching the Movement Magnets, otherwise it is possible the Magnets could become de sensitized, but this is by no means definite. As regards recommendations on what not to do, these of course are analogue Meters so need to be treated with slightly more respect than their Digital counterparts normally receive. Pretty much anything can be repaired on these, except the Movement. So, where possible, avoid overloads and Reverse Current. Precautions that should be taken on any Multimeter really. There is a limit to what the Cut Out can protect against, assuming it is working and is adjusted correctly. Ian |
2nd Nov 2020, 3:13 pm | #3 |
Diode
Join Date: Oct 2020
Location: Ayr, Scotland, UK.
Posts: 5
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Re: AVO Model III
Hi Ian,
Thanks for reply - yes ithey are Model 8 III's Robert |
2nd Nov 2020, 4:58 pm | #4 |
Nonode
Join Date: Mar 2008
Location: Aberdeen, UK.
Posts: 2,838
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Re: AVO Model III
Hello Robert, welcome to the Scottish contingent of Forum membership.
My two pennoth of advice - firstly open up the battery compartment on top & check to see that some dimwit hasn't left manky flat, & possibly leaking batteries inside. Should be a 1.5V U2 size and a much smaller 15V one. These are used for the resistance ranges. Carefully check the mechanical meter zero. If you cant get it to move correctly, or the needle is a bit wibbly wobbly(floats about), then you've a movement problem. Regards, David |
2nd Nov 2020, 6:54 pm | #5 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,081
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Re: AVO Model III
Welcome! Can't add much to the above advice, but i consider these to be the last of the 'old school' Avometers, which makes them a swiss army knife, quite good at a lot of things and reasonably robust. Often requiring some sort of repair intervention if bought from someone who doesn't use them, but i think it's fair to say that most of the time this repair is not overly painful.
Dave |
2nd Nov 2020, 11:38 pm | #6 |
Pentode
Join Date: Sep 2018
Location: Maldon, Essex, UK.
Posts: 225
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Re: AVO Model III
Speaking of 15v. batteries , have a look at my (6.05pm. today) posting .
Laurie . |
3rd Nov 2020, 10:29 pm | #7 |
Diode
Join Date: Oct 2020
Location: Ayr, Scotland, UK.
Posts: 5
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Re: AVO Model III
Thank you everyone for your input.
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