Anritsu 682XXB, 683XXB manual 3-16

3-16 PULSE MODULATION
TEST: RF ON/OFF
RATIO
This pulse modulation test verifies that the ratio of RF on power to RF
off power is within specifications.
TestSetup Connect the equipment, shown in Figure 3-13, as
follows:
1. Connect the 682XXB/683XXB rear panel 10 MHZ
REF OUT to the Spectrum Analyzer External Ref-
erence Input.
2. Connect the RF OUTPUT of the 682XXB/683XXB
to the Spectrum Analyzer RF Input.
Test
Procedure The following procedure lets you determine the ratio
of RF on power to RF off power during pulse modu-
lation.
1. Set up the 682XXB/683XXB as follows:
a. Reset the instrument by pressing SYSTEM,
then Reset . Upon reset, the CW Menu is dis-
played.
b. Press Edit F1 toopen the current frequency
parameter for editing.
c. Set F1 to the frequency noted on the Test Re-
cord.
d. Press MODULATION, then Pulse . The Inter-
nal Pulse Status menu is displayed.
682XXB/683XXB MM 3-45
PERFORMANCE PULSE MODULATION TEST:
VERIFICATION RF ON/OFF RATIO
10 MHz
REF OUT
682XXB / 683XXB
EXT REF
INPUT
RF OUT
Spectrum Analyzer
RF IN
Figure 3-13. Equipment Setup for Pulse Modulation Test:RF On/Off Ratio