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Noise bandwidth
affects measurement
1 Press the front panel Preset key.
2 Press List by WL or List by Power.
3 Press Appl's and then S/N AVG.
4 To change the number of averages, press NUM AVG. The default (Preset) value is
5 To stop the measurement at the current number of averages shown, press the Single
6 When the measurement is complete, the instrument will switch to the single
7 To make a new measurement, press the Cont key.
8 To exit, press the EXIT softkey, then press the Cont key for continuous measurement.
Measurements Applications
Measuring Signal-to-Noise Ratios with Averaging
completely new measurement. During a measurement and before the number of
averages has been reached, pressing the Single key will stop the measurement.
Then, pressing the Cont key will continue with the current measurement.
While making a signal-to-noise with averaging measurement, the number of aver-
ages can be changed. As long as the new number of averages is greater than the
number of averages taken so far, the measurement continues. If the new number of
averages selected is less than the number of averages taken so far, the measurement
stops and the instrument switches to single measurement mode. Then, pressing the
Cont key will start a completely new measurement.
When measuring noise power, the Keysight 86120B must account for the noise
bandwidth used during the measurement. Because noise bandwidth varies with mea-
surement bandwidth (a wide bandwidth allows more noise to the Keysight 86120B's
detector than a narrow bandwidth), the Keysight 86120B normalizes all noise power
measurements to a bandwidth of 0.1 nm. The annotation 0.1 nm is displayed to
show that the noise bandwidth is being normalized to a 0.1 nm bandwidth.
To measure signal-to-noise with averaging
100.
key. Then press the Cont key to continue the present measurement.
measurement mode and stop.
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