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Old 31st October 2002, 11:54 AM   #1
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Default Dumb Question about locating groung plane

I want to bypass the opamps in my DAC. I am concerned that the current from a ohm meter may damage sensitive devices, if I use one to find the ground trace closest to the opamps. With my board being triple sided I don't want to rely on visually tracing it back to the PS. Are my fears unfounded?? What is the best, safest, surest way to find a ground trace close to the opamps. Thanks in Advance,
Julien
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Old 31st October 2002, 12:07 PM   #2
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Old 31st October 2002, 12:18 PM   #3
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Bypass opamps, do you mean bypass them (disconnect them) or do you mean add decoupling caps? If you want to add decoupling caps, haven't opamps already got it?

BTW: I don't think the pcb has 3 layers, 4 more likely. Signal-ground-5V-signal. The powerplane and groundplane are inside the pcb usually.
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Old 3rd November 2002, 11:47 AM   #4
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Default I am concerned that the current from a ohm meter may damage sensitive devices

With a DMM, connect the negative (black) lead to the earth common, and with the Positive (red) lead you can trace/confirm earth connections without fear of damaging things.
Make sure the board is unpowered while doing this.

Eric.
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Old 10th November 2002, 12:26 AM   #5
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Default Thanks Gentlemen.. yout reply is much appreciated NT

NT
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