HP E4418B Programming Manual page 41

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
HP-IB data, however it does affect the auto averaging setting (refer to
Figure 1-3 on page 1-49).
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 (for
further details on the resolution parameter refer to the commands in
Chapter 2, "MEASurement Instructions".). Also, in this example the
expected power and source list parameters are defaulted. 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 1-18. 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
MEAS1? DEF,3
Example 5 - Making a Difference Measurement
The following command can only be carried out on the HP E4419B. 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
MEAS2:POW:AC:DIFF? DEF,DEF,(@2),(@1)
HP E4418B/E4419B Programming Guide
Power Meter Remote Operation
Making Measurements
specifies resolution setting
specifies between which channels
the difference is calculated
Channel B - A
1-17