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Advice for a Short circuit detector
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zanzeoo:
Hello

I have a trouble with a 12 layer board, Vcc is shorted somewhere with GND.

In the past i used a TONEOHM 950 which is very useful in that case. But so much expensive ( 10K$ )

I thinking to buy or make a Short circuit  detector more simple or less expensive.

Do you have any recommandations

Thx
DL2XY:
Thermal Imager ?!
zanzeoo:
it does not work well with small current... :-[
Gyro:
You don't say whether the PCB is populated or not, but assuming not.

Set a bench PSU in current current limit mode to as high a current as you sensibly can (somewhere around the expected circuit current consumption or higher) and put it across VCC and GND. Then go around with a DMM (hopefully a 4 1/2 or 5 1/2 digit) on its most sensitive mV range and work across the board, starting at the inputs and measure the voltage between VCC and GND points. The lower the mV (maybe 10s of uV) reading, the closer you are to the short. This can actually be a pretty sensitive method.

If the PCB is populated, it's pretty much the same as above, but set the PSU to less than the normal VCC rail voltage before going into current limit mode.
zanzeoo:
Yes the board is populated

i found a video of a TONEOHM 950 :
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