Remote Control - Commands
R&S NRP-Z5x
1137.0463.12
6.4
E-7
By invoking the
CALibration:TEST?
command, the power difference in W between the test heater
switched on and off is determined and output.
CALibration:TEST:DEViation?
With
CALibration:TEST:DEViation?
, the power difference in W between the test heater switched on and
off is determined. The relative deviation of the power difference from the reference value stored during
calibration is output.
The
CALibration:TEST:DEViation?
query internally calls up the
CALibration:TEST?
and
CALibration:TEST:REFerence?
queries. The relative deviation of the first value relative to the reference
value is calculated as follows:
1
=
erence
n:TEST:REF
CALibratio
n:TEST
CALibratio
iation
n:TEST:DEV
CALibratio
CALibration:TEST:REFerence?
During the calibration process, the power difference in W between the test heater switched on and off is
determined and stored in the calibration data set.
CALibration:TEST:REFerence?
yields the value
stored at the time of calibration.
CALibration:ZERO:AUTO[?] OFF | ON | ONCE
The commands
CALibration:ZERO:AUTO ON
and
CALibration:ZERO:AUTO ONCE
zeroes the three
measurement paths of the sensor. For this purpose, the test signal must be deactivated or the sensor
disconnected from the signal source. The sensor automatically detects the presence of any significant
power to be measured. This causes zeroing to be aborted and error message
NRPERROR_CALZERO
to be output. The
CALibration:ZERO:AUTO OFF
is ignored. Zeroing takes four seconds at a minimum,
but at least as long as the selected averaging filter needs for settling (only fixed-filter mode).
Repeat zeroing
•
during warm-up after switching on or connecting the instrument
•
after a substantial variation of the ambient temperature
•
after fastening the sensor 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.
For zeroing switch off the test signal and do not remove the sensor from the signal source.
Apart from keeping the thermal balance, this has the advantage that the noise
superimposed on the test signal (e.g. from a broadband amplifier) can be detected on
zeroing and does not impair the measurement result.
