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The output interference of the voltage sensor is large, how to choose the filter

thread240-487766

The output interference of the voltage sensor is large, how to choose the filter

The output interference of the voltage sensor is large, how to choose the filter

(OP)
I use a voltage sensor to measure the sinusoidal voltage signal attached to both ends, and get messy. I want to design a low-pass filter to filter out high-frequency interference signals. The problems are as follows:
1. Is there any relationship between the cut-off frequency of the low-pass filter and the measured signal? ；
2. Is there a better filter option?
The measurement signal is shown in the figure, the blue is the waveform at both ends of the sensor, and the yellow is the output of the zero-crossing comparator.

RE: The output interference of the voltage sensor is large, how to choose the filter

What's to design? The spikes are so high frequency compared to the sinusoid, a cap on the input would knock it out without a problem and the comparator would do the rest...

Of course, it might make more sense to find the source of the spikes and kill those at the source.

Dan - Owner
http://www.Hi-TecDesigns.com

RE: The output interference of the voltage sensor is large, how to choose the filter

Quote:

1. Is there any relationship between the cut-off frequency of the low-pass filter and the measured signal?
MGS is correct, a cap will knock down the spikes, but it can't be too large, or it will attenuate the desired signal as well, which goes to the cutoff frequency of the filter, the cap in this case, needs to be about 2x the highest desired frequency of the passband.

TTFN (ta ta for now)
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RE: The output interference of the voltage sensor is large, how to choose the filter

looks like a couple of ferrite beads with clear up your spike problem.

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