Measuring Stop Band Attenuation Of A Lowpass Filter - Keysight Technologies N9322C User Manual

Measuring Stop Band Attenuation of a Lowpass Filter

Measuring Stop Band Attenuation of a Lowpass Fil ter
When measuring filter performance, it is useful to look at
the stimulus response over a wide frequency range. Setting
the analyzer y- axis (amplitude) to Log scale type presents
the measurement data in a usable format for determining
filter characteristics.
The following example uses the tracking generator to
measure the stop band attenuation of a 370 MHz low pass
filter.
1
To measure the response of a low pass filter, connect the
equipment as shown in
370 MHz low pass filter.
Figure 3-20 Transmission Measurement Test Setup
Remote
Standby
On
Press Preset. (With Preset Type of Factory)
2
3
Set the start and stop frequencies and resolution bandwidth:
Press Frequency > Start Freq > 100 > MHz
Press Frequency > Stop Freq > 1 > GHz
Press Amplitude > Scale Type > Log
Functions and Measurements
Figure 3-20
N9320A
SPECTRUM ANALYZER 9 kHz - 3.0 GHz
Auto BW/ Sweep/
Tune Avg Trig
View/ Det/ Marker
Trace Display
MODE Meas Marker
7 8 9
4 5 6
1 2 3 Back
0 ·
Enter
TG SOURCE CAL OUT
50MHz 10dBm PROBE POWER
DUT
. This example uses a
Local
File/
Print
Save
Peak
Search
50VDC MAX
30dBm 1W MAX
RF IN 50
CAT Ⅱ
61