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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 9th May 2019, 1:02 pm   #2161
Sinewave
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Default Re: AVO Multimeter survey

What are the different variants? I can only off the top of my head think of 5.
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Old 9th May 2019, 1:10 pm   #2162
AndyGilham
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Default Re: AVO Multimeter survey

Actually, the differences I have seen are only related to the top resistance board (Or Volt former board). From early models with just wound shunts, then hand wound resistors and the introduction of wound coils in various combination and then the resistors......it just goes on!

Andy
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Old 9th May 2019, 3:03 pm   #2163
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Quote:
Originally Posted by AndyGilham View Post
Actually, the differences I have seen are only related to the top resistance board (Or Volt former board). From early models with just wound shunts, then hand wound resistors and the introduction of wound coils in various combination and then the resistors......it just goes on!

Andy
I see, so not variants as such, just different components used from time to time?
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Old 9th May 2019, 7:50 pm   #2164
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Default Re: AVO Multimeter survey

Andy, I now recall i posted details of Meter 769-2929 on the survey thread, starting at Page 72, Post No.1438 onwards. These notes are preferable to the handwritten ones, which are a bit muddled. (searching on 769-2929 i the quickest way to access it i imagine)

The peg at the rear of the early type nickel plated Z screw appears to be glass, i assume this is to prevent touching the screw with a finger affecting the needle deflection. It does look a bit fragile though, replacing the movement is delicate!

Dave

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Old 9th May 2019, 11:27 pm   #2165
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Default Re: AVO Multimeter survey

New unit:

AVO 8 MK5
No 0547746CE 7/84
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Old 13th May 2019, 7:00 am   #2166
AndyGilham
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Quote:
Originally Posted by The Philpott View Post
Andy, I now recall i posted details of Meter 769-2929 on the survey thread, starting at Page 72, Post No.1438 onwards. These notes are preferable to the handwritten ones, which are a bit muddled. (searching on 769-2929 i the quickest way to access it i imagine)

The peg at the rear of the early type nickel plated Z screw appears to be glass, i assume this is to prevent touching the screw with a finger affecting the needle deflection. It does look a bit fragile though, replacing the movement is delicate!

Dave

Thank you Dave, I shall compare your detailed notes with my instrument.

Regards
Andy
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Old 18th May 2019, 11:51 am   #2167
M0XNA Neil
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Default Re: AVO Multimeter survey

Acquired two AVO9 SX's and both with cases with serial numbers:


5222-1S-263 which will be February 1963.

5573-1S-163 which will be January 1963.


Both are still accurate and look as if they have never been used out of their cases.

Neil
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Old 5th Jun 2019, 2:16 pm   #2168
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Default Re: AVO Multimeter survey

Multimeter Survey 3rd Edition.

Finally got round to finishing this Edition of the Multimeter Survey.
Thanks to everybody still contributing Numbers and Information.

A little behind schedule, but have had very little Time recently to spend
on this, but it's ready now.

I'm trying to make it a bit more interesting and informative than simply a
long list of Numbers and this is the first attempt at expanding it's scope
some what. It is significantly updated from the previous Edition.

Comments and suggestions most welcome as always.
Hope the Forum find this useful or informative.



Ian
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File Type: pdf AVO Multimeter Survey 3rd Edition.pdf (1.36 MB, 33 views)
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Old 5th Jun 2019, 2:40 pm   #2169
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Default Re: AVO Multimeter survey

Ian,

Very many thanks for the work you have done on this survey. Even at a quick assessment it makes very interesting reading and I can see that I have a few numbers I should be contributing.

PMM
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Old 5th Jun 2019, 4:47 pm   #2170
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Default Re: AVO Multimeter survey

I have an AVO 8 MkIII serial no. 67186-1067.
An AVO 9SX but only number on the dial says Meter Type 12889.
Also an AVO Multiminor Mk5 stamped into the dial 27363
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Old 5th Jun 2019, 11:06 pm   #2171
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Default Re: AVO Multimeter survey

Noble work Ian. Steve (SPCh) would have been so pleased that all this data was finally captured for posterity.
Thanks you for this very thorough effort.
-Jeremy
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Old 7th Jun 2019, 7:06 pm   #2172
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Default Re: AVO Multimeter survey

Please find attached an update to the Model 40 Data.

I don't know if anybody actually uses the Survey Data, but I
use it occasionally and noticed the Model 40, 47A Data ect wasn't
sorted correctly, so the Years were a bit jumbled about.

So I have reproduced the Model 40 Data here as an update.

For the future, I have also removed a number of entries where Meters
had no Serial Numbers logged as it seemed a bit pointless having them
included.

Sorry for any inconvenience



Ian
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Old 13th Jun 2019, 6:59 pm   #2173
The Philpott
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Default Re: AVO Multimeter survey

Thanks for your efforts Ian.

It may be of interest to note that an Avominor Type E testmeter has just come up for sale elsewhere, s/n E157-1954, indicating that the Type E was still being made in 1954. (It also supports my assertion that more than one sequence of serial numbers was allocated to the 'E', No.157 being an unsuitably low number for a meter that had been in production for 14 years!)

This meter is highly likely to have the additional back-board inside, loaded with component resistors. (Good longevity but poor access until the board is removed.)

Also of interest is a RAF label announcing that the meter requires attention but is repairable- either by an approved RAF facility or an approved outside contractor. The fault mentioned is an error of 2% on the 20mA range- and the date on the label is 1970.

Yet another piece of WW2 spec equipment that the RAF carried on using for quite some time, then.. The generation of a repair request on the basis of a 2% error seems excessive to me - (on such a small meter.)

Dave
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Old 13th Jun 2019, 7:09 pm   #2174
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Default Re: AVO Multimeter survey

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Originally Posted by The Philpott View Post
The generation of a repair request on the basis of a 2% error seems excessive to me - (on such a small meter.)

Dave
That baffled me too, especially considering the accuracy at FSD as it is anyway!
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