All Questions
Tagged with multimeter safety
14
questions
0
votes
1
answer
59
views
"buzzing" sensation from a touch dimmer when touched with wet hand
My house has the above touch dimmers from the late 70's or 80's. They usually give off an imperceptible buzz or no sensation when used.
Today I unthinkingly touched one with a wet hand and felt a ...
1
vote
2
answers
224
views
How do you safely measure large AC currents using a multimeter without a current clamp?
I would like to measure the RMS current draw of several house appliances, in addition to the primary and secondary side current of a step-down transformer.
Simply placing my multimeter in series with ...
- 633
1
vote
0
answers
94
views
CAT ratings and DC voltages
I'm a bit lost about the CAT ratings (protection ratings) for oscilloscopes (and multi-meters).
There are many tables for which category is needed for which application (for example here or here,) but ...
- 7,697
4
votes
3
answers
551
views
How to test an anti-static mat that says \$10^7 \sim 10^9 \Omega\$ surface resistance
I just bought a well-made mat that says surface resistivity is 107 ~ 109 Ω.
The multimeters on the market test up to like 20 MΩ.
If I buy a multimeter to test it:
If it displays infinite, I won’t ...
- 177
0
votes
1
answer
423
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Have I been poisoned by lead dust from my blown fuse
just wondering if I've poisoned myself. I was doing something silly and the 10A fuse exploded in my multimeter with the glass cylinder and alloy dust shattering and splattering making a mess on the ...
- 1
0
votes
1
answer
55
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Measuring current on 25W incandescent lamp - loud bang/spark from DMM probes?
I was trying to do a power calibration on a Tasmota smart switch, using this procedure:
https://tasmota.github.io/docs/Power-Monitoring-Calibration/
I had an 25W incandescent globe (resistive load), ...
- 283
1
vote
1
answer
8k
views
Is it safe to use my multimeter to test UK wall outlet voltage?
From the question it should be clear I'm no expert. Just want to learn.
I have a digital multimeter.
If I connect the multimeter to hot+ground & hot+neutral on the 240v 50hz (max ~30A) AC wall ...
- 13
0
votes
0
answers
407
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Using a larger fuse in my multimeter
I am trying to replace the burned out fuse in my multimeter. It is very small with dimensions of 3.6mm X 10.25mm and has a rating of 600mA @ 250V.
I can't seem to find this fuse. I can find one with ...
- 365
33
votes
12
answers
26k
views
Multimeter exploded during ACV measurment - What did I do wrong?
simulate this circuit – Schematic created using CircuitLab
A DT-830B meter.
I bought a new transformer, and I was trying to measure the output voltage. I plugged the probes on 'VΩmA' (not 10 A)...
user100933
2
votes
3
answers
2k
views
Under which possible conditions is measuring with an multimeter a danger to life ?
My knowledge of electrics is very limited, I am planning to buy a Multimeter, but I am confused when it comes to safety. I do not really know what is a danger to life when measuring a circuit with a ...
- 121
9
votes
4
answers
46k
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Why would you use a non-contact voltage detector if you have a multimeter?
I was reading this Fluke multimeter safety manual and I came across this sentence: http://faculty.riohondo.edu/jfrala/fluke_multimeters_-...
2
votes
1
answer
1k
views
Fuse rating and safety
Under what conditions would a faster, higher rupture capacity, higher voltage-rated fuse be less safe than the equivalently current-rated fuse which was slower, lower rupture capacity or lower voltage-...
- 199
1
vote
2
answers
2k
views
Multimeter into wall sockets
If you placed one of the multimeter's probes into the hot slot of the wall outlet and touched the other probe to your skin while grounded, for example to some dirt outside, would you get bitten by the ...
- 59
0
votes
1
answer
269
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Downsides of using 5mm fuses in 6.3mm sockets
For my multimeter I need to replace a fuse. It is 6.3mm in diameter, 25mm long, rated 500mA/250V AC and 1500A interrupt rating.
I have a couple of such fuses, but they are 5mm in diameter, and ...
- 6,568