Power Viewer R&S SMC100A
1411.4060.32 4.50 E-1
Frequency - Power
Sensors
Source User only
Enters the frequency for measurement source User.
Remote-control command:
SENS:POW:FREQ 2.5MHz
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.
Remote-control command:
SENS:POW:OFFS -2 dB
SENS:POW:OFFS:STAT ON
Filter Length - Power
Sensors
Selects the filter length used for measurement.
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
carriers. A more stable display has to be traded off against longer
measurements. The measurement 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.
Measurements are continuously repeated in a predefined time
window. The measurement result is obtained by averaging the
measured values for the last 2N time windows. The number N is the
filter length, the factor of 2 arises because the output signals from the
microwave detector to suppress low-frequency noise are chopped at
the same rate as the time windows, which means that an independent
measured value can only be obtained from two consecutive values. As
the filter length is the multiplier for the time window it directly
influences the measurement time.
The filter length can be selected automatically or can be manually set
to a fixed value. As a preliminary, you should always check if the auto
mode is giving satisfactory results because you will always have to
adjust an optimal, manual filter-length setting if the power is not
constant.
Selection Fixed Noise is offered for reaching a defined measurement
accuracy.
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