Amprobe ACDC-620T Clamp-On-Multimeter - Manual (Page 34)

c AC MOTOR CURRENT MEASUREMENT
You can measure starting (inrush) current , running current, and current imbal-
ance in AC Motor circuits. Inrush current is typically 6-8 times the value of run-
ning current, depending on the motor type..
1. St the rotary switch to "A".
2. Press and hold the PEAK button(>1sec) to enter 1ms PEAK hold mode.
3. Clamp around a motor phase conductor. Be Sure the clamp jaws are com
pletely closed, or measurement will nor be accurate..
4. press ZERO to set the display to zero.
5. Turn the mmotor on.When the motor gets to the desired speed, obbserve
the display for inrush current reading.
6. If the reading is "OL" , you can push the RANGE button momentarily to
change measuring range. Turn off the motor.
7. repeat your measurament from step 2 through 6 for each phase. Avoltage
imbalance or a shorted motor winding may cause imbalance current..
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