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Dumb Question about locating groung plane
Dumb Question about locating groung plane
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Old 31st October 2002, 11:54 AM   #1
julien43 is offline julien43
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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
UrSv is offline UrSv  Sweden
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Old 31st October 2002, 12:18 PM   #3
peranders is offline peranders  Sweden
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Dumb Question about locating groung plane
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
mrfeedback is offline mrfeedback  Australia
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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
julien43 is offline julien43
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Default Thanks Gentlemen.. yout reply is much appreciated NT

NT
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