Instrument Function
R&S
®
SMC100A
152Operating Manual 1411.4060.32 ─ 09
Remote command:
:SENSe<ch>[:POWer]:DISPlay:PERManent:PRIority on page 271
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. If a Rohde & Schwarz power sensor receives an input power during
the zeroing process, it aborts zeroing and generates an error message. Zeroing takes
a few seconds, depending on the sensor model. Refer to the documentation of your
power sensor for more information.
Tips for zeroing
When to 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 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, but do not disconnect it from the power
sensor. This proceeding keeps the thermal equilibrium, and the zeroing process
also compensates the noise that superimposes the measured signal (e.g. from a
broadband amplifier).
Remote command:
:SENSe<ch>[:POWer]:ZERO on page 276
Source
Selects the source for measurement.
"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 ampli-
fier gain with 2 sensors).
Remote command:
:SENSe<ch>[:POWer]:SOURce on page 275
Frequency
Source User only
Enters the frequency for measurement source "User".
Remote command:
:SENSe<ch>[:POWer]:FREQuency on page 274
RF Block
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