Create a simple High pass filter to sense AC signal


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Old 09-03-14, 01:28 PM
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Create a simple High pass filter to sense AC signal

Hi there,
I am interested in measuring higher frequencies of the AC signal we get in our homes. I have figured out that in order to do so, I'll have to use a High pass filter (HPF) before connecting it to DSO/Spectrum analyzer which have lower input limits.

I was wondering if anyone who has done this kind of thing before can share some thoughts. The circuit should be pretty simple. The procurement of parts won't be that simple. Would anyone where to get polypropylene capacitors (0.1 uf) or so.

Also, would anyone know where to get off-the-shelf HPFs which can handle the 120 V RMS AC signal.
 
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Old 09-04-14, 01:00 AM
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The parts you should be able to get from Mouser or DigiKey.

I am interested in measuring higher frequencies of the AC signal we get in our homes
The 60hz signal is so strong I'm not sure what else you'd find.
If you have a spectrum analyzer then just use an inductive loop for pickup.

There are many harmonics on the line from all these chopper/switching style power supplies.
 
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Old 09-04-14, 07:06 AM
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I would be suspicious an inductive loop would act a a low pass filter and not give a true reading of higher harmonics and interference.

There are 1:10 and 1:100 shielded probes available for instruments to read voltages higher than they are rated for.
 
 

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