©2019 ALL-TEST Pro, LLC All Rights Reserved 19 Rev 06/20/2019
not only identify faults within the winding or insulation system but also identify small changes
that provide early warning or other changes in the system.
Static Testing
The static tests refer to the deenergized motor winding tests performed with the motor rotor in
a stationary “static” position. It uses ALL-TEST Pro’s proven testing methods to measure the
windings in all three phases at various pre-determined test frequencies. The results of these
tests are used to calculate the patented Test Value Static (TVS) and Reference Test Value Static
(REF TVS) (REF TVS).
Contamination: Measures the Dissipation Factor (DF) and the capacitance between motor
frame–stator windings.
Resistance: 0.01 - 999 Ω, resolution 0.01mΩ. True 4-wire Kelvin measurement for accurate low
resistance results (includes automatic compensation for thermoelectric offset voltages).
Insulation Resistance: 0 – 5000 Meg Ω @1000V, 0 – 5000 Meg Ω @500V
Note: Static tests (except for DF and Capacitance) can be performed directly at the motor or
from the starter or motor drive. However, testing from the starter or motor drive can introduce
external sources of interference that can influence the test results. User should repeat any test
from the starter/drive to verify measurements are repeatable.
Test Value Static (TVS)
The TVS is a single value which is calculated using a proprietary algorithm that defines the
symmetry of the three-phase winding system. This value is calculated from measurements made
at several different frequencies through the motor stator windings. Any change in the winding
insulations systems condition will be reflected in the TVS.
Reference Test Value Static (REF TVS)
When a test record is saved as reference type in the instrument, the TVS is called REF TVS. Each
REF TVS corresponds to a specific machine and serves as baseline test data for diagnostic
purpose. Any measured TVS can be trended over time or compared to its REF, or the REF value
of another motor that is known to be in good condition and is exactly the same motor.
Capacitance (C)
The insulation between the winding conductors and the machines frame form a natural
capacitor. Capacitance is a measure of a systems ability to store electrical charges. The
magnitude of capacitance in a system is determined by:
• Effective surface area or conductors in the case of a motor.
• Distance between the conductors
To Next Page
