Old automotive battery charger question
I have an approx. 40 year old 12/6 volt automotive battery charger. When set for 12 volts and not connected to a battery, it reads 12.81 volts. Set to 6 volts and not connected to a battery, it reads ...
Forum Discussion
unless you have a true rms voltmeter, the voltage reading from these old (and some newer) battery chargers w/o a battery hooked up is really of marginal use. The old ones used selinium rectifiers and no output filtering, that was the job of the battery. So the unloaded output voltage is NOT DC, nor is it a sine wave.
About all a DC or "peak responding sine wave 60Hz calibrated" voltmeter will tell you is that there is an output voltage.
About all a DC or "peak responding sine wave 60Hz calibrated" voltmeter will tell you is that there is an output voltage.
