Keysight Technologies N9340B, User Manual

Page: 52 / 172

Making Measurements

Measuring a Low-Level Signal
46
Using the Average Detector and

Increased Sweep Time
The analyzer’s noise floor response may mask low-level
signals. Selecting the instruments averaging detector
and increasing the sweep time will smooth the noise and
improve the signal’s visibility. Slower sweep times are
necessary to average noise variations.
1 Refer to
"Reducing Input Attenuation" on page 29
,
and follow steps 1, 2 and 3.
2 Press [TRACE] > {More} > {Detector} > {Average} to
select the average detector.
3 Press [BW/SWP] > {Sweep Time} to set the sweep
time to 500 ms. 
Note how the noise appears to smooth out. The
analyzer has more time to average the values for each
of the displayed data points.
4 Press [BW/SWP] > {Avg Type} to change the average
type.
Figure 4-9 Using the average detector