I want to check the open voltage of my battery charger, and I think this is what you call it when its plugged in and no battery installed. [Sorry, not much electrical knowledge]
My charger is labled at 4.2V output. Do I simply plug it in and attach each DMM probe [auto range set to AC V?] to the pos. and neg. sides of one channel?
When I did the above I get a reading of .027V?? on the auto range setting.
Does this make sence?
Evert thing except the AC V part makes sense, try using DC V.
But the open voltage does not say much about anything, the charger is electronically controlled and the open voltage might be above or below 4.2 volt, depending on how the electronic does the controlling.