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ScopeMeter® Test Tool
MDA-550-III Test Tool
71
Motor Shaft
The Motor Shaft function detects bearing flash-over that can damage motor bearings. The
measurement requires a connection to the rotating shaft of the motor. For this measurement,
brushes are included as accessories. Alternatively, you can use a stranded wire probe. Fluke
recommends the VP410 10:1 Voltage Probe. See Figure 35.
Figure 35. Motor Shaft Test Setup
W Caution
For safety, stop the motor.
To s e t u p:
1. Remove the black protective cap and black insulation sleeve from the probe tip.
2. Place the brush on top of the voltage probe.
3. Turn the screw to tighten the brush on the probe.
4. Place the probe in the magnetic probe holder. Extend the probe holder with the included two-
piece extension rod.
Note
Use the probe holder to keep the probe in a fixed position and the brush in contact with
the motor shaft.
5. Make sure that it is possible to make good electric contact with the shaft before you do the
measurement.
A
B
Voltage Probe
Magnetic Probe Holder
77


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