Ryobi RY48ZTR75 Service Manual page 57

USING THE DMM TO MEASURE VOLTS
Before touching the probes of a DMM to
Anything, be sure it is set to the correct
setting
To measure DC voltage:
1. first set the DMM to measure voltage,
ensuring DC (NOT AC) setting
2. Touch the Black probe to ground
3. Touch the Red
measured
probe to voltage being
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DMM shows
12.55V DC battery voltage