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multimeter reading creeping up

J

James Sweet

Jan 1, 1970
0
I picked up a Mastech benchtop true RMS DMM the other day since I wanted
something with a PC interface and so far it's just illustrating why I
like my Fluke so much, this thing is defective right out of the box.
Before I return it, I'm curious if anyone can shed some light on what
it's doing, I'd love to open it up and have a look, but I don't want to
void the warranty since it's new. Still, my curiosity is aroused.

The issue I'm seeing is the reading creeps up over time. I left it
monitoring the AC mains and it was working fine, then a couple hours
later I came in to see it reading 145V! Thinking I had some serious
wiring issues I grabbed my handheld meter and it read almost exactly
120V. I power cycled the new one and the reading returned to normal so I
left it going and by morning it read 345V. I reset it again and tried,
this time recording the readings and found that it worked fine for about
2 hours, then started increasing at quite a steady pace. Now I've got
the probes unplugged entirely and it reads a bit over 190VAC and still
slowly climbing. Anyone more familiar with the design have some insight?
DAC? RMS conversion? Reference? I wondered if the voltage reference to
the DAC might be heating up and dropping over time, but the instant
recovery by cycling the power points elsewhere.
 
A

Archimedes' Lever

Jan 1, 1970
0
THE M,AJOR PROBLEMS I HAVE LOGGED WITH THESE METERS IS THAT AFTER THE
OVERLOAD PROTECTION IS ENGAGED SOMETIMES THEY GROW SLUGGISH AND
TROUBLESOME

You're an idiot. The "overload protection" is ALWAYS in place.
THEY SCAN FOR A READINGS WHICH DON'T EXISTS

No, that is what happen when your doctor is looking for functioning
neurons in your skull cavity.
AND LOCK UP UNTIL A STEADY
GREATER VOLTAGE IS DETECTED

READ the post, you idiot. His meter is not "locking up", it is
CREEPING up, you fucking electronics know nothing CREEP!
FOR FUURE REFERENCE

No one has done fuehrer reference since Hitler, and everyone that did
found themselves to be on the wrong side. That is probably your problem
as well.
I WOULD RECOMMEND PURCHASING TEST EQUIPMENT FROM
PRESTIGIOUS SERVICE RELATED COMPANIES NOT WANNABE COMMERCIAL TECH
COMPANIES

Good for you, idiot. Maybe when you have two pennies to rub together,
you can afford one.
 
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