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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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Old 2nd Nov 2020, 2:26 pm   #1
electricsub
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Join Date: Oct 2020
Location: Ayr, Scotland, UK.
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Default 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:
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Old 2nd Nov 2020, 3:05 pm   #2
Superscope
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Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 485
Default 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
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Old 2nd Nov 2020, 3:13 pm   #3
electricsub
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Default Re: AVO Model III

Hi Ian,
Thanks for reply - yes ithey are Model 8 III's

Robert
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Old 2nd Nov 2020, 4:58 pm   #4
David Simpson
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Default 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
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Old 2nd Nov 2020, 6:54 pm   #5
The Philpott
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Default 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
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Old 2nd Nov 2020, 11:38 pm   #6
Rileyman
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Default Re: AVO Model III

Speaking of 15v. batteries , have a look at my (6.05pm. today) posting .

Laurie .
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Old 3rd Nov 2020, 10:29 pm   #7
electricsub
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Default Re: AVO Model III

Thank you everyone for your input.
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