How to test ground with a DMM
#4
simply using a dmm to measure resistance may not do it. DMMS use very low currents to measure ohms. However you may have a bad connection that will pass low currents with minimal voltage drop, but as soon as you pass 10-20 or more amps the voltage drops. I have seen this several time.
So the best way is yes, first test with a DMM, but then you ahve to make sure the connections are SOLID! Then run your system loud and measure the voltage between a good chassis ground and the ground terminal of you amp. It should read almost Zero.
So the best way is yes, first test with a DMM, but then you ahve to make sure the connections are SOLID! Then run your system loud and measure the voltage between a good chassis ground and the ground terminal of you amp. It should read almost Zero.
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