R&S SMU200A Test Procedures
1007.9845.82 1.25
E-12
Settling Time
Test assembly Connect the spectrum analyzer (Table 1-2, item 24) to the RF connector
of the DUT.
Test method The spectrum analyzer is operated as a fast level meter with a span of 0
Hz. A controller transfers the start and the stop level via the IEC bus. The
analyzer is triggered by the positive edge on the EOI line of the IEC bus.
When the controller switches over from start to stop level, the settling
procedure is displayed on the screen of the analyzer.
Preparation of measurement
Synchronize the reference frequencies of the DUT and the analyzer.
Make IEC/IEEE bus and RF connections
.
A
pply trigger connection to EOI line (pin 5) of the IEC/IEEE bus.
Setting on DUT
:
- F
requencies (SMU, R&S SMJ): 30 MHz, 1 GHz, 2.2 GHz, 3 GHz,
4 GH
z, 6 GHz
- Frequencies (SMATE): 30 MHz, 1 GHz, 2.2 GHz, 3 GHz,
4 GHz, 4.5 GHz, 5 GHz, 5.4 GHz, 6 GHz
Settings on spectrum analyzer
:
- R
eference level: target level + 3 dB
- Amplitude log range 10 dB
- Resolution bandwidth 200 kHz
- Video bandwidth 2 MHz
- Span 0 Hz
- Sweep time (SMU, R&S SMJ): 62.4 ms, 31.2 ms for list mode
- Sweep time (SMATE): 12.48 ms, 6.24 ms for list mode
- Triggering externally by the positive edge at 1.4 V.
Measurement
First send the start and then the stop level from controller
.
T
he level characteristic from the trigger point is displayed on the
screen of the externally triggered analyzer.
The time difference between the trigger time and the time to reach
the specified deviation to the final level is defined as the settling
time.
Measure the following steps (recommended) with ALC state on, ALC
state off (S&H) and with List mode:
Start level in dBm Stop level in dBm Remarks
-130 maximum specified level With options R&S -B31, -B32,
-B36, -B37 with attenuator mode
"auto" and "normal"
P
max
of 5 dB attenuation + 2.5 dBm P
max
of 5 dB -27.5 dBm And reverse
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