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Error reading peak signal values

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Error reading peak signal values

Postby jane » Tue Mar 27, 2012 6:43 pm

When I apply 142mV (100mV rms) from the internal signal generator to Ch A I do measure:
Amplitude at peak: -20.69 dBV
Average amplitude at peak: 74.2mV

Why do I read 74.2mV and not 92.4mV that is equal to -20.69 dBV?
And why not 100mV or 142mV (peak value)?

According to the Picoscope 6 users guide (Spectrum measurements):

Amplitude at peak.
The amplitude of the peak signal value.

Average amplitude at peak.
The amplitude of the peak signal value averaged over a number of captures.

In other words: "Average amplitude at peak" should be equal to "Amplitude at peak" when the stddev is close to zero..


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Re: Error reading peak signal values

Postby Martyn » Wed Mar 28, 2012 9:12 am

We are currently looking at the Picoscope 6 measurements for the 4262 as there may be a few inaccuracies with these.
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