R&S SMC100A Power Viewer
1411.4060.32 4.49 E-4
Zero - Power Sensors
Activates the auto zero function.
Zeroing calibrates the external power sensor by adjusting its reading
at zero signal power. For this purpose, the RF power source must be
switched off or disconnected from the sensor (see tips below). R&S
power sensors automatically detect the presence of any significant
input power. This aborts zeroing and generates an error message.
Zeroing can take a few seconds, depending on the sensor model;
refer tothe documentation of your external power sensor for more
information.
Tips for zeroing
Perform zeroing
- During warm-up after switching on or connecting the
instrument
- After a substantial change of the ambient temperature
- After fastening the power sensor module to an RF connector at
high temperature
- After several hours of operation
- When very low-power signals are to be measured, e.g. less
than 10 dB above the lower measurement limit.
Switch off the RF power source for zeroing; do not disconnect it from
the power sensor. In this way you will maintain the thermal
equilibrium, and zeroing will also compensate for the noise
superimposed on the measured signal (e.g. from a broadband
amplifier).
Remote-control command:
SENS:POW:ZERO
Source - Power
Sensors
Selects the source for measurement frequency of the sensor.
RF
Measurement source is the RF signal of the
generator. The RF frequency 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.
Remote-control command:
SENS:POW:SOUR A
User
Measurement source is any freely selectable
source. The frequency is entered manually under
frequency.
Remote-control command:
SENS:POW:SOUR USER
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