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61
Functions and Measurements
Measuring Stop Band Attenuation of a Lowpass Filter
Measuring Stop Band Attenuation of a Lowpass Filter
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
Figure 3-20
. This example uses a
370 MHz low pass filter.
Figure 3-20 Transmission Measurement Test Setup
2
Press
Preset
. (With
Preset Type
of
Factory
)
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
Remote
Standby
On TG SOURCE CAL OUT
50MHz 10dBm
7
·
4
1
0
2
5
8 9
6
3 Back
Enter
Marker
Peak
Search
Marker
Auto
Tune
Det/
Display File/
Print
BW/
Avg
View/
Trace
Meas MODE
Sweep/
Trig
Local
Save
N9320A SPECTRUM ANALYZER 9 kHz - 3.0 GHz
PROBE POWER
RF IN 50
50VDC MAX
30dBm 1W MAX
CAT Ⅱ
DUT