QuantAsylum QA401, Руководство пользователя

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QuantAsylum QA401 User ’s Manual
Page
35
isn’t germane to the topic at hand can cause confusion. So, for this reason, you should only the
measurements you wish to display, especially if you are going to share the data with others.
RMS/Power
The RMS (formerly Pwr) button refers to the power measurements. When this button is selected, the
power will be computed across the specified measurement start and stop span. In the plot below, we
can see a few key pieces of data related to this measurement. First, we can clearly see the measurement
is performed over the 20 to 20 KHz interval. Next, we can see the total power measured in this interval
is
– 60 dBV. Since the noise is so far down below the signal, this makes sense. Next, we can see that
noise and distortion (N+D) is -99.5 dBV. The N+D measurement is the measured power in the specified
20 to 20 KHz interval, but it DOES NOT include the power contained at the generator frequency. If the
generator is turned off, you
’ll see the Total Power matches the Noise and Distortion power.