Keysight E6640A, Руководство пользователя и программиста по приложениям измерений

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15 Power Control Measurement
Meas
the factory default instrument settings. It does not initiate the taking of measurement data unless INIT:CONTinuous is
ON. If you change any measurement settings after using the CONFigure command, the READ command can be used to
initiate a measurement without changing the settings back to their defaults.
In the Swept SA measurement in Spectrum Analyzer mode the CONFigure command also turns the averaging function
on and sets the number of averages to 10 for all measurements.
:CONFigure: <measurement>: NDEFault stops the current measurement and changes to the specified measurement. It
does not change the settings to the defaults. It does not initiate the taking of measurement data unless INIT:CONTinuous
is ON.
The CONFigure? query returns the current measurement name.
The CONFigure:CATalog? query returns a quoted string of all licensed measurement names in the current mode. For
example, "SAN, CHP, OBW, ACP, PST, TXP, SPUR, SEM, LIST".
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, for example, 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. An
error message is reported if a measurement other than the current one is specified.
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 than 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.
READ Commands:
:READ:<measurement>[n]?
•
Does not preset the measurement to the factory default settings. For example, if you have previously initiated the ACP
2644 W-CDMA & HSPA Measurement Applications Reference