Rohde & Schwarz SME02 - Output Reflection Coefficient

SME Test Procedure
1038.6002.02 5.17 E-13
5.2.12 Output Reflection Coefficient
Test equipment -VSWR bridge (Section 5.1, item 11)
- VSWR directional coupler (Section 5.1, item 25) for SME06
- Second signal generator (Section 5.1, item 5)
- Spectrum analyzer (Section 5.1, item 2) .
Test setup
Note: For test frequencies >3 GHz use a VSWR directional coupler
instead of a VSWR bridge.
The test port of the bridge or the directional coupler has to be
screwed directly to the DUT.
×
Ø
S M E
RF
Signal generator
Source refl.
Object output
10-MHz reference
LO
Analyzer
Bridge (test frequency
≤
3 GHz)
Directional coupler (test frequency > 3 GHz)
Measurement À Settings at the SME
-Test level
- Test frequency, unmodulated.
À Settings at the Spectrum analyzer
- Test frequency
-Test level
- Resolution and video bandwidth 10kHz,
- Span 0 Hz,
- linear scale
- Sweep time 30 ms.
À Settings at the second signal generator
- Detune by 100 Hz compared to the test frequency,
- first minimal level, unmodulated.
À At the spectrum analyzer, now bring the line indicated approx. into
the center of the screen by varying the reference level and read
and note down the level as a reference level.
À Screw off the bridge or the directional coupler from the SME and
increase the level at the second signal generator until the reference
level is measured again at the analyzer.