Non-Contact Rotary Field Indication - Amprobe PRM-6 Manual Del Usuario

Figure 1:

Non-Contact Rotary Field Indication

The Indicator will not operate with motor controlled by frequency
converters. The bottom of the PRM-6 should be oriented towards the drive
shaft. See the Orientation Symbol on the PRM-6.
If the motor was disconnected from electricity for a long time (typically one
year), the residual field / magnetization may be too weak for the tester to
measure the rotation.
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