Keysight Technologies N9340B, User Manual

Page: 62 / 172

Making Measurements

Making a Stimulus Response Transmission Measurement
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5 Press [BW/SWP] > {Sweep Time (Auto)} to put the
sweep time into stimulus response auto coupled
mode.
6 Increase measurement sensitivity and smooth the
noise:
Press [BW/SWP] > {RBW} > 30 > {kHz}
Press [BW/SWP] > {VBW} > 30 > {kHz}
A decrease in the displayed amplitude is caused by
tracking error.
7 Connect the cable from the tracking generator output
to the analyzer input. Store the frequency response in
trace 4 and normalize:
Press [MEAS] > {Normalize} > {Store Ref} (1→4) >
{Normalize (On)}
8 Reconnect the DUT to the analyzer and change the
normalized reference position:
Press [MEAS] > {Normalize} > {Norm Ref Posn} > 8 >
[ENTER]
9 Measure the rejection of the low-pass filter:
Press [Marker] > {Normal} > 370 > MHz, {Delta} > 130
> {MHz}
The marker readout displays the rejection of the filter
at 130 MHz above the cutoff frequency of the
low-pass filter.
Figure 4-17 Measure the Rejection Range