©2019 ALL-TEST Pro, LLC All Rights Reserved 22 Rev 06/20/2019
“Dynamic and Stator Signatures
TM
” (patented): Measures, in real time during manual rotation,
a number of parameters in all three phases which together forms the “Test Signature” for the
rotor and stator. The "Test Signature” is then automatically analyzed in the instrument and gives
the user immediate results for Stator and Rotor status. The “Test Signature” can also be
uploaded to the optional PC software and evaluated further.
An example of dynamic test signatures is shown above. The six dotted lines, each of which
consisting of 8 data points represent the rotor signatures. For further information review the
Motor Circuit Analysis Manual provided with your instrument.
Recommended Testing Practice
Prior to the motor installation in the field, a DF/C + Insulation + Static + Dynamic test should be
performed directly at the motor leads and then saved as a reference test.
After the motor is installed then an Insulation + Static test should be performed from the
starter/drive and then saved as another reference test. This test should be repeated to verify
stable results are achieved.
Subsequent Insulation + Static testing can be done for trouble-shooting or other purposes. If a
change in either the Insulation or Static test is observed, then both tests should be performed at
the motor with incoming leads removed from the motor.
This new Insulation + Static test at the motor terminals should now be compared to the initial
reference static test that is mentioned in item 1.
If the values have not changed from the initial static test, then likely the problem is related to
cables/connections between starter/drive and motor.
If values have changed from initial static test, then the user will need to perform a complete
DF/C + Insulation + Static + Dynamic to determine the root cause for this change.
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