CMU Measurement Control
1100.4903.12 5.33 E-8
Generator Control
The commands used for control of the CMU's RF and AF signal generators are analogous to the meas-
urement control commands explained on page 5.28. The generators are in one of the following two
generator states:
OFF generator switched off, resources released
RUN generator running
The RUN state corresponds to the status indication ON in the RF generator softkey (see section Ana-
lyzer/Generator Menu in Chapter 4).
The relation between generator commands and generator states is shown in the following diagram:
OFF RUN
INITiate
ABORt
INITiate
ABORt
Fig. 5-8 Generator states and control commands
Generator control commands are recognized by the second-level keyword RFGenerator or AFGen-
erator. The generator control commands behave as follows:
INITiate:
RFGenerator
INITiate:
AFGenerator...
Starts the generator, reserves all necessary hardware resources and
changes to the generator state RUN.
As illustrated in Fig. 5-8, INITiate can be called in any generator state. If
the generator is already running (RUN), INITiate has no effect.
If the generator can not be started due to a resources conflict it remains in
the OFF state, and the measurement status returned by the
FETCh:<meas_obj>:STATus? is ERR. At the same time the SCPI error
–213, Init ignored, is generated.
Possible resources
conflicts
• The RF connector is already allocated by another generator. The other
generator must be switched off first.
Sequential execution INITiate is implemented as a sequential command. The *OPC command
(see Chapter 6, Common Commands) can be applied together with the
INITiate command.
ABORt:
RFGenerator
ABORt:
AFGenerator...
Switches the generator off, releases the hardware resources for other gen-
erators, and changes to the generator state RUN.
As illustrated in Fig. 5-8, ABORt can be called in any generator state. If the
generator is switched off (OFF), ABORt has no effect.
Sequential execution ABORt is implemented as a sequential command. The command is not
terminated before the generator is completely switched off.
Note: In some measurements (e.g. in function group Audio), several RF or AF generators can be
used, each of them corresponding to a separate application. In this case, one generator
must be switched off (ABORt:...) before the application is changed and another gen-
erator is started. Otherwise, the measurement will be stopped and the CMU will display an
error message.
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