Meg-ohm Meter Insulation testing will only detect faults to ground. Since only about 17% of motor electrical winding failures begin as ground faults, these faults will go undetected using this method alone.

Surge testing requires the application of high voltages and while appropriate for testing new coils it can be destructive when testing a winding (or motor) where the condition of the insulation system is unknown. This aspect, combined with the size of surge testing equipment and the need for external power to operate the instrument makes it inappropriate for troubleshooting and predictive maintenance testing.

Resistance and inductance-only (RCL) test methods don’t provide enough information for reliable fault detection and troubleshooting.

ALL-TEST PRO® instruments are your best choice for fault detection and troubleshooting.