R&S SMB Test Procedures
1407.0806.82 1.45 E-5
Rise/ Fall Time
Test assembly Test Assembly for Pulse Modulation (see page 1.3)
Test method The RF signal is down converted to 0 Hz in phase. Thus, the IF output
reproduces the RF amplitude vs. time.
Measurement
Setting on pulse generator:
For adjustment statically high level,
for measurement square wave pulse sequence with a frequency of
1 MHz, TTL level
Setting on DUT:
RF On
Level 0 dBm
Frequency recommended test frequencies
Pulse Modulation menu:
State On
Setting on Signal Generator:
RF On
Level Recommended Lo-Level of Mixer
Frequency same as DUT
Setting on oscilloscope:
Adjust V/div according to the mixer in use
Time base 20 ns/div
Trigger:
- for adjustment free running,
- for measurement 50 % of signal amplitude, rising and falling
edge.
Adjustment: At each test frequency adjust phase using menu RF
Mod / Frequency/Phase / Phase Settings. Vary the Delta Phase
to obtain maximal signal output at the mixers IF port. The voltage at
maximum corresponds to 100 % of RF amplitude.
Measurement: Evaluate the down converted pulse-modulated
signal on the oscilloscope.
Rise time = time between 10% and 90% of signal amplitude
Fall time = time between 90% and 10% of signal amplitude
Recommended test
frequencies
400 MHz, 1.1 GHz, 2.2 GHz, 3.2 GHz, 4 GHz, 5 GHz, 6 GHz
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