
UMS100/120/120 System Manual
Operating with ARGUS-UMS
3030.3059.72-02.00 40
Figure 2-9: Listen Mode in Scan
2.3.7 Bandwidth Measurement in Scan
Before starting the
Bandwidth Measurement
the
Start
and
Stop Frequency
should be set so that the
range is at least about two times wider than the expected bandwidth (test-scan). The
Bandwidth
Measurement
can only be selected with button <B> if the scan is stopped.
There are two possibilities:
•
x dB down (default is 26 dB)
•
Percent below peak (ß measurement) (default 1 %)
Please insure before starting the measurement that a sufficient measurement dynamic range is
available (e.g.
S
30 dB).The measurement is always performed with
Max Peak
. Also the step width
should be made small enough to get a fine resolution.
•
After starting the scan the
center frequency
marker is manually set with the mouse or by entering
the frequency in the corresponding input field.
•
The measurement window is set in that way that one of the yellow lines is moved with the mouse
where the other follows symmetrically around the center. Another method would be to enter the
value in the corresponding input field.
•
Depending on the selected number of scans (1, 10, 100) and sufficient measurement dynamic the
differential markers appear on the screen (small yellow circles at the left and right flanges of the
signal of interest) and the corresponding calculated bandwidth is displayed in the line above the
graphic.
The following picture shows the ß-method with 1 % setting.
Содержание 3030.3013.02
Страница 4: ......
Страница 6: ...UMS100 120 120 System Manual Contents 3030 3059 72 02 00 4...
Страница 70: ......