R&S
®
CMW 500 Remote Control
Control of the Instrument
Operating Manual 1202.3986.32 – 03 89
State Valid
results?
Effect of FETCh...?
OFF No Returns NCAP. FETCh...? should not be used in the OFF state.
RUN Yes/No R&S CMW 500 waits until the results of the current measurement cycle have become
valid and returns them. In continuous repetition mode the R&S CMW 500 continues
acquiring results without reaching the RDY state.
RDY Yes Returns the results.
RDY No Returns NCAP.
Repeated FETCh...? commands
It is possible to use repeated FETCh...? commands without re-starting the
measurement, e.g. in order to monitor the variation in time of a measured quantity in
continuous measurement mode.
In single-shot mode where the measurement reaches the RDY state and is
stopped before the first FETCh...? is executed, the results of repeated
FETCh...? commands will be identical.
In continuous mode, the first FETCh...? is executed after the end of the current
measurement cycle. The following FETCh...? commands are executed as
quickly as possible, no matter whether the R&S CMW 500 has acquired new
results.
5.4.3.2 READ...? Command
Aborts the current measurement (if a measurement is running), starts a new
measurement in single shot mode, and returns the results including the reliability
indicator at the end of the measurement cycle.
READ...? does not change any of the measurement control settings. The
measurement initiated by READ...? is stopped after one single shot (-->
measurement state RDY), however, the repetition mode itself is not changed.
READ...? can be used in all measurement states.
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