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Registered
Join Date: Jan 2004
Location: Colorado Springs
Posts: 869
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RMS is an average of sorts. To find RMS take the Peak and divide by square-root of 2. SO the AC signal of 170V, if this was peak not RMS, would convert to an RMS of 120.2V which sounds reasonable.
I am not sure I buy that though because of the issue of the DC battery reading. Also multimeter's show RMS when measuring AC voltage. Something weird is going on with your measurement. Here is what I would check.
1. Check that your probes are on the correct terminals. You have to switch where they plug in to do current measurements. Make sure they are set on voltage.
2. Make sure you are on the correct range. Depending on the multimeter, you may have to pick a starting range. Some have auto-ranging.
3. Try to measure again.
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'97 Saturn SL (tiny 1.9L bubble car)
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