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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.
Test Setup
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 to open 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