Tagged Questions
2
votes
1answer
172 views
Why does my PSU die everytime I test with multimeter
I've set up my PSU to use as a "lab power supply", I'm trying to obtain 12 Volts at 14 amps. I have the red, orange, yellow, black wires separated, and connected the green wire to ground to keep the ...
2
votes
4answers
2k views
Wrong multimeter readings measuring 12V lead acid battery
I just got my first multimeter and when I measured a 12V 1.2ah lead-acid battery I get AC 28.8V and DC 13.4V. Is this normal?
In addition I tested an AA 1.5V battery and I got 2.9V (AC setting 200) ...
1
vote
1answer
235 views
What' the low voltage displayed by a voltmeter when only one of its probes is connected?
Recently I was toying with a digital multimeter and observed the following. The multimeter was set to measuring AC voltage with the upper limit of 750 volts. It has two probes which I will call "red" ...
3
votes
2answers
182 views
How stable are digital multimeters' parameters?
I live in a region where standard mains voltage is 220 volts. Recently I tried to measure it using a digital multimeter. The multimeter specs say that it has maximum error of 1,2 percent of the ...
3
votes
2answers
1k views
Can I Test Bug Zapper's Voltage With Multimeter?
I have The Executioner bug zapper:
Although it uses 2 AA 1.5v batteries, it also has voltage multiplier like Cockcroft–Walton generator i guess and would like to know if it is safe and would make ...
5
votes
4answers
3k views
how to measure the internal resistance of a voltmeter?
How to find out what is the internal resistance of a voltmeter? I imagine the higher the better - it'll have less influence on the measured circuit.
What is the approximate internal resistance of ...
6
votes
1answer
655 views
Why can't a multimeter measure its own current and voltage?
Well I finally obtained another multimeter, so now I have a Mastech MS8226T and a Ben Electronic M92A. I decided to measure at which voltages would the low battery warning appear and how much current ...
7
votes
2answers
210 views
Can anyone suggest a voltmeter that can do the job?
I am trying to make a high voltage measurement on an industrial sputtering machine. The voltages are in the 50V to 1000V range. Right now, we're using a Fluke DMM because we need a true floating ...
