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there a way to calibrate an autoranging multimeter? Answered

Hello community, I have a little problem with auto ranging multimeter Techman brand TM-107 the question is that I would like to calibrate and mark certain ranges wrong, I have intermediate level knowledge of electronics, the question is whether by changing parts that do not make their specific value would fix the problem or would have to make other method?

4 Replies

iceng (author)2013-06-02

You got this second hand ?

Any digital multimeter that needs recalibration has way too much
wrong with it and is ready for the garbage.

Factories no longer recalibrate DMMs they just them out throw out
and ship replacements except those damaged and misused by
the original purchasing owner.


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jediknightgeorge (author)2013-06-02

this is a auto range DMM but some signs of voltage testers or test ohms or does not work really well diodes gives very low values, the true knowledge as well as project staff would like to know if there is any way to calibrate this DMM is to learn more.

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framistan (author)2013-06-01

Possibly you are using the meter wrong, or don't understand what it is "telling" you. I made a training CD on "How to use a Digital Volt Meter" several years ago ... so this is what I believe the problem is: When you first turn ON the meter with the probes sitting loose... the meter will AUTOMATICALLY step down... down... down to the MOST SENSITIVE range. That might be the 100 milli-Volt range (mV). This is because NOTHING is attached to the probes yet. If you are not NOTICING the display says "mV" millivolts, you may think the display is showing 20 Volts when probes are attached to NOTHING! When actually the meter is just "seeing" a bit of stray voltage present all around us as the probe wire is acting as a kind of antenna to pick up the tiny voltage. You must pay CLOSE attention to the display. Is it reading VOLTS? or mV (millivolts).

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Josehf Murchison (author)2013-06-01

Do you have the manual?
And If you do does it have a schematic?

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