How to start the LPF function? When will this function be used?

Low pass filter is built in clamp meter with LPF function, typically, this function is used to measure PWM output signal of frequency converter, the high frequency will be filtered during measurement so as to measure signal of fundamental wave.

For example:
1. The frequency converter will interfere the electric circuit at a high frequency for variable-frequency motor.
2. Be sure that voltage and frequency can be measured accurately for variable-frequency drive.