Anritsu MS8608A, Руководство по эксплуатации, Страница: 133 / 338

6-21
Section 6 Performance Tests
(b) Resolution bandwidth selectivity
Step Procedure
1
Set the MS8608A/MS8609A as shown below:
Center Freq ............................................ 200 MHz
Span .......................................................... 10 kHz
RBW (MANUAL) ................................... 300 Hz
Scale ............................................ LOG 10 dB/div
VBW ........................................................ 100 Hz
Marker ................................................ NORMAL
Zone Width ................................................... 1 div
2
Press the
→
RLV key to match the peak of the signal
trace to the top line (REF LEVEL) on the screen.
3
Press the Single key to execute a single sweep,
then check that the single sweep has been com-
pleted.
4 After pressing the Measure key, press the
more key and then select Occ BW Measure.
5 After selecting X dB Down method, set it to 60 dB.
6
Set the Occupied Bandwidth to on state by operat-
ing menu key.
7 The 60 dB resolution bandwidth value is displayed
in the upper left-hand corner of the screen.
Fill in this value in the table on the next page.
8
Repeat steps 1 to 7 for the frequencies other than the resolution bandwidth 300 Hz and the
frequency span 10 kHz according to the combinations of resolution bandwidth and frequency
span shown in the table on the next page.
9
For the 3 dB bandwidth, too, write the value of the Resolution Bandwidth (3 dB) table on the
preceding page in the table on the next page.
And for each resolution bandwidth in the table on the next page, confirm that the value
calculated from (60 dB BW/3 dB BW) is
≤
15.
60 dB Bandwidth Measurement