Measurement Commands - Agilent Technologies EPM-P Series Programming Manual

Example 4 - Specifying the Resolution Parameter
The previous examples detailed the use of the expected value and source
list parameters. The resolution parameter is used to set the resolution of
the specified window. This parameter does not affect the resolution of the
GPIB data, however it does affect the auto averaging setting (refer to
Figure 1-3 on page 1-60).
Since the filter length used for a channel with auto-averaging enabled is
dependent on the window resolution setting, a conflict arises when a given
channel is set up in both windows and the resolution settings are
different. In this case, the higher resolution setting is used to determine
the filter length.
The following example uses the resolution parameter to specify a
resolution setting of 3. This setting represents 3 significant digits if the
measurement suffix is W or %, and 0.01 dB if the suffix is dB or dBm.
Refer to Chapter 2, "Measurement Commands" for further details on the
resolution parameter. The expected power and source list parameters are
defaulted in the example. The expected power value will be left unchanged
at its current setting. The source list parameter will be defaulted as
described in the note on page 1-12. Note that as the source list parameter
is the last specified parameter you do not have to specify DEF. The
measurement is carried out on the upper window.
specifies window
Example 5 - Making a Difference Measurement
The following command can only be carried out on the HP EPM-442A. It
queries the lower window to make a difference measurement of
channel B - channel A. The expected power and resolution parameters are
defaulted, leaving them at their current settings.
specifies window
EPM-P Series Power Meters Programming Guide
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specifies resolution setting
MEAS1? DEF,3
MEAS2:POW:AC:DIFF? DEF,DEF,(@2),(@1)
Power Meter Remote Operation
Making Measurements
specifies between which channels
the difference is calculated
Channel B - A
1-11