3 Making Measurements
5Press [Sweep] > {Sweep Time (Auto)} to put the sweep time into stimulus response auto coupled mode.
6Increase measurement sensitivity and smooth the noise:
Press [BW/SWP]> {RBW} >30 > {kHz}
Press [BW/SWP] > {VBW} > 30 > {kHz}
A decrease in displayed amplitude is caused by tracking error.
7Connect 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)}
8Reconnect the DUT to the analyzer and change the normalized reference position:
Press [MEAS] > {Normalize} > {Norm Ref Posn} > 8 > [ENTER]
9Measure 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 18 Measure the Rejection Range
48 | N9340A User’s Guide |