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uni-t ut61e voltage problem

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bug13:
Hi guys

I got a UT61E from UNI-T, say I got a 6V source, when I first turn on the meter, say it read about 6.500V, and reading will run down slowly from 6.500V to about 6.180V, in about 1-2mV step. |O

What's the problem and how can I fix it?

thanks guys

PS1: My voltage source is from a power supply, not a battery
PS2: My other cheap meter get about 6.00V or there about, and stay there.
PS3: I can fix it with messing around the trim pot likehttp://gushh.net/blog/ut61e-calibration/] [url]http://gushh.net/blog/ut61e-calibration/ [/url], but the same problem happen after a day or two. :palm:

PedroDaGr8:
Are you hooking up the meter to the unloaded supply? Then the high impedance of the input jacks may not let the power supply bring its voltage down quick enough. Try putting a load between the two pins on the supply then measuring. See if that doesn't fix it.

Cheaper meters often have much lower impedance which might be low enough to allow the power supply to function (with the meter serving as a load |O)

bug13:

--- Quote from: PedroDaGr8 on August 29, 2013, 05:57:49 am ---Are you hooking up the meter to the unloaded supply? Then the high impedance of the input jacks may not let the power supply bring its voltage down quick enough. Try putting a load between the two pins on the supply then measuring. See if that doesn't fix it.

--- End quote ---

I put a 100ohm resistor across a 3V source, same thing still happen, it reads 3.2xxV and slowly run down toward 3V

Monkeh:
Something's wrong with your meter.

bug13:

--- Quote from: Monkeh on August 29, 2013, 12:35:50 pm ---Something's wrong with your meter.

--- End quote ---

Any idea on how can I fix it?

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