prog.book : chapter1.fm 16 Mon Feb 15 09:24:37 1999
Power Meter Remote Operation
Making Measurements
1-16 HP E4418B/E4419B Programming Guide
Example 2 - Specifying the Source List Parameter
The MEASure command has three optional parameters, an expected power
value, a resolution and a source list. These parameters must be entered in
the specified order. If parameters are omitted, they will default from the
right. The parameter DEFault is used as a place holder.
The following example uses the source list parameter to specify the
measurement channel as channel A. The expected power and resolution
parameters are defaulted, leaving them at their current settings. The
measurement is carried out on the upper window.
The operation of the MEAS1? command when the source list parameter is
defaulted is described in the note on page 1-18.
Note For the HP E4418B it is not necessary to specify a channel as only
one channel is available.
Example 3 - Specifying the Expected Power Parameter
The previous example details the three optional parameters which can be
used with the MEASure? command. The first optional parameter is used to
enter an expected power value. Entering this parameter is only relevant if
you are using an HP E-series power sensor. The value entered determines
which of the power sensor’s two ranges is used for the measurement. If the
current setting of the power sensor’s range is no longer valid for the new
measurement, specifying the expected power value decreases the time
taken to obtain a result.
The following example uses the expected value parameter to specify a
value of -50 dBm. This selects the power sensor’s lower range (refer to
“Range”, on page 1-47 for details of the range breaks). The resolution
parameter is defaulted, leaving it at its current setting. The source list
parameter specifies a channel B measurement. The measurement is
displayed on the lower window.
MEAS1? DEF,DEF,(@1)
specifies window specifies channel
MEAS2? -50,DEF,(@2)
specifies window specifies channel
specifies expected power value
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