Annex: Remote Control - Commands
R&S NRP
1144.1400.12
Annex - I.12
E-2
Measuring with low-level commands
Low-level commands allow the user to perform the most important modifications on the measurement
configuration. In the present context, low-level commands are all commands that do not belong to high-
level commands. These are in particular the commands of the SENSe, TRIGger and CALCulate
systems. Since the high-level commands combine different low-level commands, they allow a simpler
configuration of measurements.
Each measurement configuration should begin with the *
RST
command, which sets the R&S NRP to a
defined output state. The accurate settings are described in the documentation of remote control
command
SYSTem:PRESet
. The most important settings are listed below:
•
Continuous measurements are stopped (
INIT:CONT OFF
)
•
Offset correction are deactivated (
SENSe:CORRection:OFFSet:STATe OFF
,
SENSe:CORRection:DCYCle:STATe OFF
,
SENSe:CORRection:FDOFfset:STATe OFF
).
•
All other settings of the SENSe system depend on the sensor used and are specified in the
corresponding manual.
•
The first 4 CALCulate blocks are set to sensors 1 to 4 (
CALCulate
n
:MATH "(SENS
n
)"
).
•
The values are measured as absolute values (
CALulate:RELative:STATe OFF
).
•
Logarithmic units are used (
UNIT:POWer dBm
and
UNIT:RATio dB
).
The simplest measurement
The fastest way to obtain a result is to use the following sequence of commands
*RST
INIT
FETCh?
Normally,
*RST
will set the ContAv mode. The concept of smart-sensor technology provides that each
sensor determines the reset values of the assigned SENSe and TRIGger block. Thus, another mode
than ContAv may come after
*RST
with future sensors. Information is provided in the operating manual
of the sensor used.
INIT
initiates the measurement. After
*RST
, the trigger system is set to "straight through" (
TRIG:SOUR
IMM
) so that the trigger system state changes to MEASURING via INITIATED and WAIT_FOR_TRG.
After the measurement has been completed,
FETCh?
delivers the result to the output queue from which
it can be fetched.
Configuration of the trigger system
Trigger source
After a measurement is started with
INIT
, the state WAIT_FOR_TRG is entered. This is a preliminary
stage to the measurement, which has been initiated so that the measurement may start with high
accuracy at a defined point in time. For this purpose, different sources can be defined for the trigger
event, which triggers the measurement. In manual operation, a trigger event is not expected in the
ContAv mode. Since the measurement is to be performed continuously, the trigger source
(
TRIGger:SOURce
) is set to
IMMediate
.
