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ITech IT6121 precision power supply always display a tiny reading

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jjloki:
 :-\


Hi everyone,

I hope you're all doing well. I've recently encountered a puzzling issue with my ITech IT6121 Precision Power Supply, and I'm seeking some guidance from the knowledgeable community here at EEVblog.

The problem I'm experiencing is that regardless of whether I turn on the output or not, the measurement meter consistently displays a tiny output reading. It's a cause for concern because I'm unsure whether this is normal behavior for the equipment or if there's an underlying issue that needs addressing.

I've tried troubleshooting on my own, including checking the connections, reviewing the manual for any relevant information, and experimenting with different settings, but unfortunately, I haven't been able to resolve the issue.

If you have any insights, advice, or troubleshooting steps that you think might be helpful, I would greatly appreciate your input. Additionally, if there are any specific tests or checks you recommend conducting to diagnose the problem more accurately, please let me know.

Thank you in advance for your assistance. I'm looking forward to hearing from you and hopefully getting this issue resolved soon.

alm:
1 mV output when set to 0.0000V does not sound concerning to me. What is the specification for programming voltage accuracy? Does the offset remain when you set it to a higher output voltage? If this is out of spec, then my guess is that's an adjustment issue.

jjloki:

--- Quote from: alm on April 01, 2024, 08:55:09 am ---1 mV output when set to 0.0000V does not sound concerning to me. What is the specification for programming voltage accuracy? Does the offset remain when you set it to a higher output voltage? If this is out of spec, then my guess is that's an adjustment issue.

--- End quote ---

Thanks for the reply alm.

Sorry for the confusion and I should have decribed the issue more clearly. If you look at the picture I just attached, even if I turn off the output. There is a small reading 0.001V (now it's 0.002V) displayed by the internal voltage meter and 0.00015A (now it's 0.00030A) displayed by the current meter. That's two reading's will stay there if I turn on the output (eg. set 1V, it display 1.001V etc)

Anyway to get rid of this?

Thanks!

alm:
What is the specified accuracy for voltage and current programming and read back? Do you have access to a DMM that's in calibration with a better uncertainty than the power supply?

J-R:
It's doubtful the OP fully understands the concepts especially since they claimed to have already read the entire manual and are still thinking there is something wrong.

The short answer is that there is nothing wrong.

Per the specifications in the manual, the 12 month readback accuracy is:
Voltage ±0.02%+3mV
Current ±0.05%+2mA

So ignoring the percentage portion of the specification, at ANY TIME, the indicated display could be 3mV and 2mA away from the actual value and still be considered working correctly.

In the photo, it's only 1mV and 0.15mA off, which is great.
In your second post, you state it was 2mV and 0.3mA off which is still fine.

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