Author Topic: UNI-T UT61E Multimeter - Peak testing  (Read 7759 times)

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Offline alexig

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UNI-T UT61E Multimeter - Peak testing
« on: January 04, 2013, 12:50:42 pm »
Hi all,

I think my meter might be faulty and I'm wondering if anyone who has the UNI-T UT61E Multimeter can replicate the results of the video below?



Thanks,
Alex
 

Offline dr_p

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Re: UNI-T UT61E Multimeter - Peak testing
« Reply #1 on: January 04, 2013, 02:47:00 pm »
OK, now I see what you mean.

All I found is this:
Quote
There’s an “auto calibration” mode in this meter, but it doesn’t seem to perform what it claims. Despite fiddling with the buttons I never managed to notice a single difference in the readout, what exactly is it calibrating anyway?.
 
From what I can see the “CAL” display appears when it’s simply gathering the initial MIN, MAX and PEAK values when you press the pertinent button, it’s not performing a self DCV calibration whatsoever.

The manual certainly mentions the "cal", but I have a hunch it's not meant to work that way all the time. Maybe it's in some sort of service mode, giving you the return "cal" values. Try removing the battery (since you're at it check that it's good), draining any caps (try to power it on without the battery, then put it back together.
 

Offline Wytnucls

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Re: UNI-T UT61E Multimeter - Peak testing
« Reply #2 on: January 04, 2013, 02:50:58 pm »
They all do that. It is quite normal. After calibration, Pmax appears on the screen.
Calibration mode can be forced in peak mode at any time, by holding the 'Peak' button for more than 2 seconds (2 beeps).

'Entering Peak mode will automatically execute peak calibration, if peak calibration was never done before. The Calibration
process measures and stores the offset voltage of internal operation amplifiers. High precision is achieved by substracting this offset from reading. When power off the ES51922 or switch the measurement mode to °F temperature mode, the calibrated
offset value will be cleared. ES51922 will automatically execute peak calibration, if peak mode was activated again after the calibrated offset value was cleared.'
« Last Edit: January 04, 2013, 03:08:03 pm by Wytnucls »
 

Offline ModemHead

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Re: UNI-T UT61E Multimeter - Peak testing
« Reply #3 on: January 04, 2013, 04:06:26 pm »
Note that 'peak' or 'fast' min and max is not a substitute for regular min and max functions. It uses a much shorter integration time and is subject to noise and transients normally filtered out during longer integration periods.  About the only use I've ever found for it is to approximate the positive and negative peaks of a sinusoid (in ACV mode.)
 

Offline alexig

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Re: UNI-T UT61E Multimeter - Peak testing
« Reply #4 on: January 04, 2013, 04:23:44 pm »
The manual certainly mentions the "cal", but I have a hunch it's not meant to work that way all the time. Maybe it's in some sort of service mode, giving you the return "cal" values. Try removing the battery (since you're at it check that it's good), draining any caps (try to power it on without the battery, then put it back together.

I checked the battery and it's good (more than 9V), tried another battery but got the same result. I left it unpowered for 5 minutes and the first time I did the peak function it read 0.7xx before it jumped to -28V and then back to 0.2 to 0.3A.
 

Offline darrylp

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Re: UNI-T UT61E Multimeter - Peak testing
« Reply #5 on: January 04, 2013, 06:44:51 pm »
The datasheet ( I think it was ) ahs leads disconnected for the calibration ion peak mode.

I personally altered wiring to get the min / max function instead of peak min and peak max.

Darryl

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