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50 Chapter 1
Making Basic Measurements
Measuring Signal-to-Noise
11. Press More, Function, Marker Noise to view the results of the signal to
noise measurement. See Figure 1-41.
Figure 1-41 Measuring the Signal-to-Noise
Read the signal-to-noise in dB/Hz, that is with the noise value
determined for a 1 Hz noise bandwidth. If you wish the noise value for a
different bandwidth, decrease the ratio by . For example, if
the analyzer reading is −70 dB/Hz but you have a channel bandwidth of
30 kHz:
Note that the display detection mode is now average. If the delta
marker is within half a division of the response to a discrete signal, the
amplitude reference signal in this case, there is a potential for error in
the noise measurement. See “Making Noise Measurements” on page 51.
10 log× BW()
S/N 70 dB/Hz– 10 30 kHz()log×+ 25.23 dB– 30 kHz()⁄==