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Low-pass filtering/ variable frequency (LPF/VFC)

LPF/VFC: Filter the influence of high frequency signal on the measurement result
The built-in low-pass filters of multimeters with low-pass filtering function will intercept signals higher than 1KHz and weaken signals lower than 1KHz and higher than 100Hz, and can measure the fundamental wave signals of frequency converters or inverters.
A low-pass filter is a circuit that allows low frequency signals to pass and weakens high frequency signals.
Low-pass filtering takes 1KHz as the cutoff frequency point, and VFC is more suitable for frequency conversion measurement. (Note: 40HZ-400Hz)

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