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Q : When the AC input is 430V, the customer's multimeter also measures 430V at the output.
A: The actual output voltage is 380V. This is because the voltage generated by the VFD is a PWM-modulated waveform with high-frequency components. To accurately measure the RMS value, a multimeter equipped with an LPF (low-pass filter) function should be used. Our multimeter shows the same reading as the customer's when LPF is disabled. However, once LPF is enabled, the measured output voltage decreases slightly.
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