Agilent Technologies PSA Series Manual page 155

Fetch Commands:
:FETCh:<measurement>[n]?
This command puts selected data from the most recent measurement into the output buffer. Use FETCh if you
have already made a good measurement and you want to return several types of data (different [n] values, that is
both scalars and trace data) from a single measurement. FETCh saves you the time of re-making the
measurement. You can only FETCh results from the measurement that is currently active, it will not change to a
different measurement.
If you need to get new measurement data, use the READ command, which is equivalent to an INITiate followed
by a FETCh.
The scalar measurement results will be returned if the optional [n] value is not included, or is set to 1. If the [n]
value is set to a value other than 1, the selected trace data results will be returned. See each command for details
of what types of scalar results or trace data results are available. The binary data formats should be used for
handling large blocks of data since they are smaller and transfer faster then the ASCII format. (FORMat:DATA)
FETCh may be used to return results other than those specified with the original READ or MEASure command
that you sent.
INITiate Commands:
:INITiate:<measurement>
This command is not available for measurements in all the instrument modes:
• Initiates a trigger cycle for the specified measurement, but does not output any data. You must then use the
FETCh<meas> command to return data. If a measurement other than the current one is specified, the
instrument will switch to that measurement and then initiate it.
For example, suppose you have previously initiated the ACP measurement, but now you are running the
channel power measurement. If you send INIT:ACP? it will change from channel power to ACP and will
initiate an ACP measurement.
• Does not change any of the measurement settings. For example, if you have previously started the ACP
measurement and you send INIT:ACP? it will initiate a new ACP measurement using the same instrument
settings as the last time ACP was run.
• If your selected measurement is currently active (in the idle state) it triggers the measurement, assuming the
trigger conditions are met. Then it completes one trigger cycle. Depending upon the measurement and the
number of averages, there may be multiple data acquisitions, with multiple trigger events, for one full trigger
cycle. It also holds off additional commands on GPIB until the acquisition is complete.
Chapter 4
Front-Panel Key and SCPI Command Reference
Measure
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