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3. Then switch to stepped
list
mode:
n
If there is no difference between the measurements in either
list
mode, then use the swept
list
mode.
n
If the memory trace indicates that there is more attenuation in swept
list
mode, it may be
due to IF delay. You can
usually
remedy this problem by increasing the sweep time.
Note
IF bandwidths of 30 to 10 Hz cause the sweep (or that segment of the sweep)
to be stepped, thus eliminating IF delay.
!Ib
Decrease the Frequency Span
The hardware of the network analyzer sweeps the frequency range in separate bands, where
switching from band to band takes time. Modify the frequency span to
ehminate
as many band
switches as possible
while
maintaining measurement integrity. Refer to the following table to
identify the analyzer’s band switch points:
‘lhble
5-5. Band Switch Points
I
Band
I
Frequency Span
I
.Ol
MHz to
.3
MHz
.3
MHz to 3.3 MHz
3.3 MHz to 16 MHz
16 MHz to 31 MHz
31 MHz to 61 MHz
61 MHz to 121 MHz
121 MHz to 178 MHz
178 MHz to 296 MHz
296 MHz to 536 MHz
536 MHz to 893 MHz
893 MHz to 1.607
GHz
1.607
GHz
to 3
GHz
1
12 (Option 006)
1
3
GHz
to 4.95
GHz
1
13 (Option 006)
1
4.95
GHz
to 6
GHz
lb
Set the Auto Sweep Time Mode
Auto sweep time mode is the default mode (the preset mode). This mode maintains the fastest
sweep speed possible for the current measurement settings.
..
.~.:::...:::::.:::::.: ..::.;:.r
..:. ..
:,>:.:.:
.q
:....:.
....
.
.I
.....
:I
............
.......
n
press
IMenu)
~~~~,‘~~~
@
@J
to
re-enter
the
auto
mode.
....... ...... .... ...... ......
.................. ............. .............................
Optimizing Measurement Results
5-51