Test Procedures R&S SMU200A
1007.9845.82 1.22
E-12
Measurement
Settings on DUT
Frequency: test frequency
Leve: (P
max
–40) dBm, unmodulated
Setting on the analyzer
Test frequency
SPAN 0 Hz
RES BW 10 Hz
SWEEP TIME 500 ms
Read out marker as rms summary
Reference level (P
max
–40) dBm
Read the level at the analyzer and define the correction factors as a
function of the frequency from the measurements performed with the
power meter.
Now the measurements between (P
max
–45) dBm and (P
max
-100)
dBm can be carried out.
In order to obtain enough spacing to the noise limit of the analyzer, a
low-noise preamplifier (Table 1-1, item 10) is looped between the
DUT and the analyzer (Caution: hermetically sealed RF cables!).
A continuity calibration at (P
max
–100) dBm is thus required, the
reference level of the analyzer should be set such that the measured
level is close to the reference level. The sweep time is to be
increased with lower levels to maintain measurement accuracy.
Now the level steps down to the lowest can be measured.
Additional Uncertainty with ALC OFF, S&H
Test method The additional level uncertainty is measured as the difference between level
setting with ALC ON and ALC OFF, S&H.
Test equipment Power meter (Table 1-2, item 8)
Test setup
Connect power meter to RF output socket.
Measurement
With ALC set to ON measure the level and note it down as reference.
T
hen switch over to ALC OFF (sample & hold) and measure the level
agai
n.
The level difference in dB between the measurements is the
additional uncertainty.
Recommended test
frequencies
10 MHz, 500 MHz, 1 GHz, 2.2 GHz, 3 GHz, 4 GHz, 5 GHz, 6 GHz.
Recommended test level P
min
with unmodulated carrier.
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