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UNI-T UT61E Multimeter teardown photos.

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gatos:
At T4P: it is obvious. But don't you think that I should tweak up a little bit the Summit on AC Voltage?

At Lightages: I agree with you. I would like to get a "DMMcheck Plus" in the future.

At Monkeh: Unfortunately Fluke is away. I wouldn't say that Fluke is out of spec on DC volts (check the measurement on the 1.5V battery). Because the 12V battery (type 23A) was used, I think it had a way to tell the user that this battery is of no use anymore. Remember some old-cheap multimeters that they had a special range for measuring 1.5V and 9V batteries?
Maybe Fluke implements this kind of measurement? Just a guess!

Lightages:
Don't tweak anything without knowing which is wrong. No Fluke ever had a battery test function. The input impedance of multimeters is 10megohm, or more. There is no way for that fluke to load that battery to give a lower voltage. It appears to be out of spec as has already been said.

Monkeh:

--- Quote from: gatos on February 24, 2013, 07:04:20 pm ---At Monkeh: Unfortunately Fluke is away. I wouldn't say that Fluke is out of spec on DC volts (check the measurement on the 1.5V battery). Because the 12V battery (type 23A) was used, I think it had a way to tell the user that this battery is of no use anymore. Remember some old-cheap multimeters that they had a special range for measuring 1.5V and 9V batteries?
Maybe Fluke implements this kind of measurement? Just a guess!

--- End quote ---

I assure you, it does nothing of the sort. That Fluke should have 11M across it in VDC at that range. It is wildly out of spec.

ddavidebor:
in fact, chinese meter usually have good calibration.

i've never found one out of specs when new... (something under 20$, but it's rubbish)

T4P:
AC Voltage? That thing is TrueRMS! So really don't attempt it.
Best step here is get the UT61E callibrated and use it to callibrate the 79III and the others

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