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Old 2nd December 2011, 08:19 PM   #1
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Default Velleman HPS40

Hello I just picked up a Velleman HPS40 scope (hand held) for $60.

It works very well and was hardly used, and retail is 8 times what I paid for it.

I purchased it for the rms wattage function at all different ohm ranges. I can now test my amps to clipping to see what rms they put out at different loads.

I also purchased some dummy loads to go with it. I am going to get them set up and fan cooled.

Does anyone know much about these scopes and of their quality? Wouldnt mind hearing some feedback.

Thanks....
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Old 26th January 2012, 08:52 PM   #2
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Quote:
Originally Posted by seankane View Post
Hello I just picked up a Velleman HPS40 scope (hand held) for $60.

It works very well and was hardly used, and retail is 8 times what I paid for it.

I purchased it for the rms wattage function at all different ohm ranges. I can now test my amps to clipping to see what rms they put out at different loads.

I also purchased some dummy loads to go with it. I am going to get them set up and fan cooled.

Does anyone know much about these scopes and of their quality? Wouldnt mind hearing some feedback.

Thanks....
I have a Velleman HPS10, perfect for audio measurements, and even for SMPS technique up to 100kHz. Over 100kHz it is difficult to see transients, and see square-wave ris and falls.
However the the POWER RMS function is not the best for punctial measurements, due to the resolution of the AD converter (only 8 bit). But it is much better then an AC volt-meter due to integration method of power calculation.
I am also planning to upgrade my HPS10 to a HPS40, since I am working on class-d amps and LLC resonant converters.
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Old 26th January 2012, 08:58 PM   #3
timwebb is offline timwebb  United States
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lucky man...good find.
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