prog.book : chapter1.fm 25 Mon Feb 15 09:24:37 1999
Power Meter Remote Operation
Making Measurements
HP E4418B/E4419B Programming Guide 1-25
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.
Using READ?
Some fine tuning of the above program segment can be carried out for
example, by setting the trigger delay off. The following program segment
assumes that channel A is currently being measured on the upper window.
ABOR1
CONF1 DEF,3
TRIG1:DEL:AUTO OFF
READ1?
Using INITiate and FETCh?
ABOR1 Aborts channel A.
CONF1 DEF,3 Configures the upper window to make a
measurement using the current setting of the
expected power and source list and a resolution
setting of 3.
READ1? Takes the upper window’s measurement. This will be
a channel A or B measurement depending on current
window setup
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