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TTi TS3021S Power Supply Calibration Issue

Hi

I have a TTi (Thurlby Thandar) TS3021S Bench Power Supply which works fine but has a slight calibration issue with its voltage display.

According to the specifications, the voltage display should be accurate to

0.2%. Mine always reads low by aboiut 1.5%.

I suspect I can fix this by a simple adjustment of an internal trimmer resistor. But which one? There are approx. 10 on the main circuit board.

Does anybody have a service manual, circuit diagram, or any other information that would help me fix this problem?

Thanks in advance for your help.

Mark

Reply to
MarkB
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Mark each trimmer and also measure whatever the in circuit resistance of each trimmer is, before speculative adjusting. Perhaps create a WWW repair brief for others while at it

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

fine

to

board.

repair

JIC check the "trimmer" ( in circuit) resistance with probes either way round and note if different

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

I am still hoping someone might be able to tell me which trimmer has the effect I desire. Experimenting with the trimmers is the final option and if it comes to that, I might not bother since the unit basically works as is.

But thanks for your advice. The point about measuring the resistance both ways is a good one - I might not have thought of that.

Reply to
MarkB

Is the meter a complete panel meter (separate item) with only a few connections or is it just a display with the A-D on the main PCB? If it is a panel meter then you could look up the model and/or check the voltage at its input connections. If it is just a display then see what chip is driving it and look up the pinout of that to see where the analogue inputs are

--
Geo
Reply to
Geo

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