I've been trying to measure PWM frequency in abs with both probes of a DMM, with just one probe I get a reading of freq and duty cycle %. Do I only need one probe? Seems for AC, one probe I get...
If you have an ammeter shunt in the line between the charger and the battery, try measuring on either side of the shunt. The voltage across the shunt may not be sufficient for the multimeter to pick up on, but if it does work it should give a good reliable answer.
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