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A look at the Uni-T UT210E

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Brian of Romsey:
Hi,

  My UT210E has arrived today, pretty reasonable time really.

  Does anyone know what the cutoff frequency of the LPF is when VFC is engaged?  The documentation only says: "Entering this mode can accurately measure voltage and current which has VFC frequency conversion. Voltage or current response display is true valid value."  I'm mostly a DC guy so this isn't a big issue, but still nice to know.  The VFC function also seems to affect the stated accuracy of both ACV and ACA.  Note that the stated frequency response is 45 ~ 400 Hz for ACV and 50 ~ 60 Hz for ACA

  A further, slightly related, question is Is this actually a True RMS meter?  That does a proper True RMS calculation?  I ask because the specs for ACV and ACA say "Non-sinusoidal wave counts add error by crest factor."

  Thanks, Brian.

joeqsmith:
I've never measured it but Google search shows 400Hz.  What did you measure? 

Martin72:
Hi,

This is what the german ut210-e manual describes :

"Frequency measurement up to 60 kHz (V.F.C. = Voltage Frequency Conversion, e.g. for electronic
actuated drives)"

joeqsmith:

--- Quote from: Martin72 on July 28, 2020, 08:01:18 pm ---Hi,

This is what the german ut210-e manual describes :

"Frequency measurement up to 60 kHz (V.F.C. = Voltage Frequency Conversion, e.g. for electronic
actuated drives)"

--- End quote ---


Using the same clamp in my previous post:
https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg3155612/#msg3155612

In the standard mode, I measure the 3dB point at 2.8KHz.   I typically suggest they are good for about 2KHz.   With VFC active, the 3dB point moves down to 660Hz.   I'm sure some are better and others worse but the 400Hz I found with Google seems to be in the ballpark.


Brian of Romsey:
Joe,

  Thanks for some definitive information, even if it is just what you've measured.  I've hand annotated my 'documentation' to match.  :)

  Cheers, Brian.

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