Instrument Function
R&S
®
SMC100A
117
Operating Manual 1411.4060.32 ─ 04
"RF"
Measurement source is the RF signal of the generator. The RF fre-
quency is used as the measurement frequency of the sensor and the
corresponding correction factor is used.
In this mode the RF frequency of the generator is send to the sensor
automatically if changed.
"User"
Measurements source is any freely selectable source. The frequency
is entered manually under frequency (e.g. for measurement of amplifier
gain with 2 sensors).
SCPI command:
Frequency - Power Sensors
Source User only
Enters the frequency for measurement source "User".
SCPI command:
Level Offset - Power Sensors
Activates and defines a level offset which is added to the measured value. This allows
e.g. an attenuator in the signal path to be taken into account. The offset is always entered
in dB, irrespective of the selected unit for result display.
SCPI command:
Auto Once
Searches for the optimum filter length for the current measurement conditions and indi-
cates value in the "Filter Length" field above.
SCPI command:
Filter Length - Power Sensors
Selects the filter length used for measurement. The filter length is the multiplier for the
measurement time and thus directly influences it.
The averaging filter is used to reduce fluctuations in the measured result to the extent
desired. Such fluctuations can be caused by inherent noise of the measuring instrument,
modulation of the measurement signal or beats from the superposition of adjacent car-
riers. A more stable display has to be traded off against longer measurements. The mea-
surement result is obtained from a two-stage averaging process.
Note:
Longer measurements does not mean that it takes longer to display a new result,
but rather that it takes longer for the result to settle when the power changes.
RF Signal - RF Block
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