Haven't heard of a restriction in low frequency on an AC voltmeter, but one always can learn more.
There is a restriction in frequency when it gets beyond 30 kHz (if I remember right), this is considered to be RF (Radio Frequency) but below that I don't see why they couldn't.
Some DMM's have a frequency counter (not very accurate) built in and usually can measure up to 1 MHz. The problem is the waveform, if it deviates from a perfect sine or a 50% duty square wave, it will be inaccurate.
Actually I was saying "Thank you" for posting the findings and the remedy to the problem.
Very creative test, I must say, yet effective!
Quote:
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The problem was no spark so I removed the crank sensor and clamped the sensor in a vise and a portable electric drill rotating at the sensor then I got AC voltage and when I tapping on the vise the signal got lost, and when tapping vise again the signal came back.
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__________________
Mostly, I don't know notin, I just know where to look.
I am looking back, to over 30 years in Electronics Design.
Electrons don't care if they move in a car, computer or relay!
95 W124 E320 M104.992 - Because, I love to repair, naaaah!
Over 221,000 Miles
Cheers,
Norbert
Last edited by oldtrucker; 10-14-2014 at 11:47 PM.
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