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Audioguy
Super User
Joined: 09 Aug 2007
Posts: 22
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 Posted: Thu Aug 09, 2007 9:49 pm Post subject: Voltage divider with PS3224 |
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Hi!
I want to use my PS3224 for watching power (+/-20V to +/-100V)amplifier output waveforms and FFT/distortion.
I will use the scope with a laptop running on batteries due to unearthed powersupply to the laptop (SMPS wallwart).
Does it matter (as long as maximum voltage at the BNC input is +/-20V)if I use a pro-grade X10/X20/X100 probe or if I use a voltage divider directly at the poweramp output and measure with ordinary test leads?
I was thinking on using a three resistor divider... something like 100k-10k-100k and measure over the middle resistor.
Also, could the above described method be used for checking 230V mains waveform?
Thanks in advance!
/Peter |
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picojohn
Site Admin
Joined: 11 Jun 2007
Posts: 371
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| Posted: Mon Aug 13, 2007 8:34 am Post subject: |
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Hello Audioguy,
In addition to safety considerations, it may save you time and effort by using a high voltage probe such as the ADF25A (http://accessories.picotech.com/oscilloscope_probes.html). It is an active differential oscilloscope probe which enables the measurement of signals not referenced to earth, therefore, mains voltages may also be tested.
Regards
John |
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Audioguy
Super User
Joined: 09 Aug 2007
Posts: 22
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| Posted: Mon Aug 13, 2007 12:08 pm Post subject: |
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When using such a differential probe... is it a must to disconnect the PC from mains supply then?
Otherwise there will be two connections to ground and I assume that could cause problems?
/Peter |
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picojohn
Site Admin
Joined: 11 Jun 2007
Posts: 371
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| Posted: Wed Aug 15, 2007 8:44 am Post subject: |
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Hello Audioguy,
You do not need to disconnect the PC from the mains power unit unless you experience power unit switching noise coupling through.
Regards
John |
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