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Precision VOM
3/23/2003 4:49:11 PMMoe
Looking for any info on Precision Apparatus Company VOM Model 844. Bought at local auction, wooden case in good shape. I need to know what batteries it takes, also a circuit diagram to help with minor repairs.

Thanks Moe.

3/25/2003 3:21:35 PMJohn McPherson
Hi,
If it does not have any resistance measuring capability- It will likely not need one.

If there is a space for a battery configured for a battery the size of a tall pop can or beer can, with terminals on top, it would likely be a an "A" cell (still available).

For repairs, Other than potential switching differences, The Simpson 260 series 2 ( ftp://bama.sbc.edu/downloads/simpson/260/series2/series%202%20schematic.gif ) is still general enough to use for repairs of almost any other 20000 ohms per volt DC (1000 ohms pervolt AC meter). If your resistance values differ because of a different rating of the D'Asonval movement- they will be a ratio of what is there.

If it is actually a VTVM, all bets are off. I have a few references (magazines, books, other reference type materials) that illustrate some test equipment from the twenties through the fifties, but nothing indexed to find easily.

Otherwise, AG Tannenbaum, or http://www.w7fg.com/manuals.php are going to be where you might find a manual with that info.


:Looking for any info on Precision Apparatus Company VOM Model 844. Bought at local auction, wooden case in good shape. I need to know what batteries it takes, also a circuit diagram to help with minor repairs.
:
:Thanks Moe.

5/24/2005 11:54:10 PMBaltazar
:Looking for any info on Precision Apparatus Company VOM Model 844. Bought at local auction, wooden case in good shape. I need to know what batteries it takes, also a circuit diagram to help with minor repairs.
:
:Thanks Moe.
5/22/2012 3:07:00 PMLars Ahlstrom
::Looking for any info on Precision Apparatus Company VOM Model 844. Bought at local auction, wooden case in good shape. I need to know what batteries it takes, also a circuit diagram to help with minor repairs.
::
::Thanks Moe.

It should be 4,5 volts and 45 volts.

5/22/2012 4:36:15 PMBob Masse
:::Looking for any info on Precision Apparatus Company VOM Model 844. Bought at local auction, wooden case in good shape. I need to know what batteries it takes, also a circuit diagram to help with minor repairs.
:::
:::Thanks Moe.
:
:It should be 4,5 volts and 45 volts.
:
:
:
:http://www.radiomuseum.org/r/precis_2_multi_range_tester_844.html
Here is a link to some info. 3 X 1.5v "D" cells and a 45v battery.
Bob Masse
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