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Uni-T UT61E slowly returns to zero in all AC modes. Should I keep it or return?

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J-R:
The manual does not state any AC accuracy specifications below 45Hz.  So applying an input below that frequency is not a valid input for the DMM's AC modes.

Serg65536:

--- Quote from: J-R on August 14, 2023, 09:39:48 am ---The manual does not state any AC accuracy specifications below 45Hz.  So applying an input below that frequency is not a valid input for the DMM's AC modes.

--- End quote ---
No 45Hz or similar limit is listed in my manual. But "no DC component" requirement is there. And frequency <1kHz.
So, to make a conclusion: AD737 is a good True Pain in the A$$ chip!  :-DD

Thank you everybody!
The meter remains in my laboratory. I don't know of any other model that measures resistance this fast anyway.

Aldo22:

--- Quote from: Serg65536 on August 14, 2023, 11:29:26 am ---No 45Hz or similar limit is listed in my manual.

--- End quote ---
Yes, it does say that.
Bandwidth (Hz) :45Hz~10kHz

I just wonder if it's true.
I just tested this out of curiosity on the An870 and it measures accurately down to about 8Hz. Below that, the measurement becomes unstable.

J-R:
Page 48 of the official manual lists the AC V specifications for the UT61E, which cover the ranges from 45Hz to 1kHz and 1kHz to 10kHz.  It also mentions 10 counts of "a residual reading".

Inputs not listed in DMM specifications are typically considered undefined, as in the behavior is unknown.  But you could run tests to see for yourself how it behaves.

myf:
Hello !

So "Uni-T UT61E slowly returns to zero in all AC modes" but seems (on video) "very quickly (1 sec. or less) go to the right values".

But usual (electronic linear with capacitors and OpAmp) filters have same rise time and relaxation time in electronics, it is not the case on this DMM.

Numeric Kalman filters have an (recursive) linear formula : Result(n+1) = A.Result(n) + B.NewMeasure(n), it does not match for this DMM.

Do you have any idea about the (low-cost) way used in this case ?

Thanks a lot (and excuse my poor english).

F. from France.   

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