4 MEASUREMENT CONDITIONS SETTING
84
4.10 Measurement Optimizing
You can set IF bandwidth, averaging and smoothing parameters in Average softkey
submenu.
4.10.1 IF Bandwidth Setting
The IF bandwidth function allows the user to define the bandwidth of the test receiver.
The IF bandwidth runs through the following sequence of numbers: 1, 1.5, 2, 3, 5, 7
within the range of 1 Hz to 30 kHz.
The IF bandwidth narrowing allows to reduce self-noise and widen the dynamic range
of the Analyzer. Also the sweep time will increase. Narrowing of the IF bandwidth by
10 will reduce the receiver noise by 10 dB.
The IF bandwidth should be set for each channel individually. Before you set the IF
bandwidth, first activate the channel.
To set the IF bandwidth, use the following softkeys:
Average > IF Bandwidth
4.10.2 Averaging Setting
The averaging is performed in a measurement point is made over several previous
sweeps. The averaging function is similar to IF bandwidth narrowing. It allows you to
reduce self-noise and widen the dynamic measurement range of the Analyzer.
The averaging in each measurement point is made over several sweeps in accordance
with the following equation:
ï
î
ï
í
ì
+=>+×
÷
ø
ö
ç
è
æ-=
==
-),1min(,0,
1
1
0,
1Nini
n
S
M
n
M
iSM
i
ii
ii
i
M i-sweep averaging result;
i
S i-sweep measurement parameter (S-parameter) value;
N – averaging factor is set by the user from 1 to 999; the higher the factor value the
stronger the averaging effect.
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