Keysight Technologies N9340B, User Manual

Page: 64 / 172

Making Measurements

Measuring Stop Band Attenuation of a Low-pass Filter
58
8 Reconnect the DUT to the analyzer. Note that the
units of the reference level have changed to dB,
indicating that this is now a relative measurement.
9 To change the normalized reference position:
Press [MEAS] > {Normalize} > {Norm Ref Posn} > 8 >
[ENTER]
10Place the reference marker at the specified cutoff
frequency:

Press [MARKER] > {Normal} > 370 > MHz
11Set the 2nd marker as a delta frequency of 37 MHz:
Press {Delta} > 37 > MHz
12In this example, the attenuation over this frequency
range is 19.16 dB/octave (one octave above the cutoff
frequency).
13Use the front-panel knob to place the marker at the
highest peak in the stop band to determine the
minimum stop band attenuation. In this example, the
peak occurs at 600 MHz. The attenuation is 51.94 dB.
Figure 4-18Minimum Stop Band Attenuation