PERFORMANCE TESTS
g. Connect the HFSSG to the RF IN port of the VSWR Bridge,
h. Program the HFSSG to 10 MHz at +13 dBm.
i. Set the RF spectrum analyzer to display approximately 10 to 1024 MHz and
set the reference level to +10 dBm.
j. Step the HFSSG from 10 to 1024 MHz in 10-MHz steps. Locate the frequency
at which the reflected signal (displayed by the RF spectrum analyzer) is
maximum and record this level. This is the point with worst-case VSWR.
k. Disconnect the UUT from the VSWR Bridge and record the new level.
1. Calculate the return loss (difference) between the two recorded levels. The
difference must be at least 14 dB (14 dB of return loss = 1.5:1 VSWR).
2. High-Level Test
a. Program the UUT to +10 dBm.
b. Select the special function fixed range on the UUT by pressing
c. Using the EDIT function on the UUT, edit the amplitude to -30 dBm.
d. Connect the UUT to the Device Under Test port of the VSWR bridge.
e. Step the HFSSG from 10 to 1024 MHz in 10-MHz steps. Locate the frequency
at which the reflected signal is maximum and record this level.
f. Disconnect the UUT from the VSWR bridge and record the new level.
g. Calculate the return loss between the two recorded levels. The difference must
be at least 7.5 dB (7.5 dB of return loss = 2.5:1 VSWR).
PULSE TESTS 4-16.
The Pulse Tests check the static and dynamic operation of pulse modulation.
REQUIREMENTS:
Proper pulse operation is tested by checking that:
• Static on/off ratio greater than 35 dB
• Dynamic rise and fall time <1 microsecond.
TEST EQUIPMENT:
RF spectrum analyzer
Pulse generator
Power meter
Power sensor (high-level)
50-Ohm termination
Oscilloscope
Detector
4-24
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