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Old 26th Jun 2019, 2:28 pm   #1
WaveyDipole
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Default Farnell TM39 Microvoltmeter schematic.

I have just recently acquired a Farnell TM39 Microvoltmeter. It seems to a quite well made if rather large instrument and seems to be in working order. Interestingly is has provision for two internal PP9 batteries and has a logging feature, although I'm not sure what this connects to? On the rear there are two sockets for a 'pen recorder'? The movement seems operate freely and does centre correctly when no power is applied. A quick test on the 10v range shows that the deflection is about correct in both directions, but I can't get it to zero when power is applied. The indicator is stable and there is a certain adjustment range of around one major scale division available, but it always stays to the left of the centre position between the 4 and 2 mark.

The fault is probably nothing major (faulty pot perhaps or leakage), but I have been unable to find a manual or schematic online. I did come across a manual for the TM2 which seems to be an older but similar instrument and a TM4 which is an RF version of the instrument, but I can't find anything for the TM39. Does anyone have a circuit diagram for this by any chance or come across a user/service manual?
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Last edited by WaveyDipole; 26th Jun 2019 at 2:42 pm.
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Old 27th Jun 2019, 9:55 pm   #2
Station X
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Default Re: Farnell TM39 Microvoltmeter schematic.

Thread title edited at OP's request.

Several posts moved to a new thread here:-

https://www.vintage-radio.net/forum/...d.php?t=157617
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Old 3rd Jul 2019, 1:12 am   #3
Julesomega
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Default Re: Farnell TM39 Microvoltmeter schematic.

I too would like to go on the record as looking for service information for the TM39, also the TM1 and TM2
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Old 3rd Jul 2019, 10:07 am   #4
short wave
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Default Re: Farnell TM39 Microvoltmeter schematic.

Hi Julian TM2 here..
https://elektrotanya.com/farnell_tm2...wnload.html#dl
regards S-W
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Old 3rd Jul 2019, 4:57 pm   #5
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Default Re: Farnell TM39 Microvoltmeter schematic.

Thanks so much to Short Wave for the link, and Wavey Dipole for his PM with helpful comments on the TM39
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