Electronics > Beginners

What am i doing wrong here?

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james_s:
Thus the importance of a proper CAT rated meter with suitable fusing to protect it and the user.

And it's also important to take the time to learn the fundamentals and learn how to use the tools properly. If people bothered to learn the basics they wouldn't be having these issues.

ElectricPower:
Thanks alot! That Worked :)

I'm understand now. Probes becomes a part of the sercuit :)

And yes, i'm not measuring AC from the wall here. On the right side of the Buck Converter it's 12V and it's 24v on the left side (input).

avogadro:

--- Quote from: radiolistener on November 24, 2019, 10:47:15 pm ---Once in the past I had such experience  :phew:  I just wanted to measure mains voltage, but forgot to switch probes from 10 Amps shunt to voltage socket. As result, I got a big bada-boom  :-BROKE

--- End quote ---

Did that with a 10 buck chinese meter. Melted he tip of the probe. Still works though just wont measure current anymore  :-DD

not1xor1:
what is wrong?
- 1) meaningless subject (it should be something "how can I measure current with a multimeter?")
- 2) breaking the circuit to measure current is not granted to work as there is a voltage drop (depends on the multimeter and on the range) that may decrease the current value (unless the load is a constant current sink) or prevent it to work properly if the voltage drops too much
- 3) uploaded images are too large

what would be more appropriate in this case ?
- 1) a current clamp
- 2) as a poorer alternative a low value accurate resistor to ensure a really low burden voltage calculating the current via the Ohm law

james_s:
Breaking the circuit is absolutely the correct way to measure the current in this situation, unless you happen to have an expensive DC current clamp that is suitably sensitive for the relatively small load being measured here. That is a pretty specialized tool, I don't personally know anyone who owns one and I would not expect anyone who needs to ask how to measure current to have one. Burden voltage is not going to be any issue at all in this application, use the 10A range of a typical multimeter and it is no problem at all.

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