*Overload Range Recommend Only for Short Time Measurements **Which Ever is Larger
Redfish 550 Specs
Details on InRush Current Measurement:
The surge in current at the start up of many electrical devices is called the InRush current. It often embodies the energy required to "get things moving" and rapidly drops to the running current of the device. You must use a specially designed clamp type meter (like the Redfish iDVM 550) to measure InRush. The iDVM 550 is the least expensive meter that we have found that incorporates the InRush feature.
Inrush current may be higher than the rating of the device's circuit breaker, yet the breaker (or overload) does not trip as it is a function of total energy or time vs current. It is common to see InRush currents that are 4 to 10 times greater than the normal running current. InRush current analysis is often done over time in conjunction with preventive maintenance, thus allowing you to watch a system trend and see if the motor or motor circuitry is degrading.
Learn more about InRush current applications at the HVACRSchool.com
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