Test sequence R&S®SML / R&S®SMV03
1090.3123.12 10.14 E-6
Settings on the R&S
SML02/03 / R&S SMV03
- FREQ:
to 1100 MHz as R&S SML01
from 1105 MHz every 20 MHz to 2200 MHz or 3300 MHz
Settings on the test receiver - R
F LEVEL mode
- C
enter frequency = FREQ (R&S SML)
- Execute function CAL ABS POWER
Record the reference value with the aid of the power sensor.
Now connect the RF output from the R&S SML / R&S SMV03 to
the RF connector of the receiver.
The receiver now measures the power via the RF connector and
determines a correction factor which is taken into account in the
subsequent measurements.
Caution: This correction value applies to the set measurement
frequency only.
Measurement Measure the level at the test frequencies.
The frequency response is the difference between the highest and
the lowest measured value.
The level error is the deviation from the set value.
Measurement method for very small levels (<-80 dBm)
Caution: A prerequisite for correct measurement is full RF shielding of the components used.
Test setup Test setup 1; a low-noise preamplifier must be connected between the
R&S SML / R&S SMV03 and the test receiver.
Measurement Having measured a level, continue by carrying out a calibration.
This enables levels down to the lowest limits set for the R&S SML /
R&S SMV03 to be measured.
Output reflection coefficient
Test setup Test setup 4, spectrum analyzer mode.
Test method Since the VSWR of a source must be measured, a purely passive
measurement using the VSWR bridge is possible only at levels where
the output impedance of the electronic attenuator defines the VSWR.
At higher levels the influence of the level control must be included. This is
done with the aid of an auxiliary transmitter which transmits a wave into the
DUT. This wave has a slightly offset carrier frequency (the difference
frequency within the control bandwidth of the level control) and is
superimposed on the decaying wave of the DUT. At an ideal internal
impedance only the decaying wave of the DUT flows back into the bridge,
whilst at an internal impedance that deviates from the ideal there is
superposition of the two components. The frequency offset gives rise to a
beat. From the amplitude ratio of this beat, conclusions can be drawn with
regard to the VSWR.
Settings on the R&S
SML01
- FREQ: 9 MHz, 50 MHz, 200 MHz, 350 MHz, every 20 MHz to 1100 MHz
- LE
VEL: 10 dBm, 5 dBm, 0 dBm, - 10 dBm
To Next Page
Loading...
