HP E4418B Programming Manual page 140

The Optional Parameters
All the MEASure commands have three optional parameters, an expected
power value, a resolution and a source list.
Entering an <expected_value> parameter is only relevant if you are
using an HP E-series power sensor. With HP 8480 series power sensors
entering a value has no effect on the power meter. 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 If the current setting of the power sensor's range is no
longer valid for the new measurement, specifying the expected power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 <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). In the case where a channel is set up in both the
upper and lower window and the <resolution> parameter settings for
these windows are different, the highest resolution setting is taken to
calculate the averaging. If you are making a ratio or difference
measurement the <resolution> parameters are applied to both
channels.
The <source list> parameter is used to define:
• in a single channel measurement, what channel the measurement
is to be made on.
• in a difference measurement whether the calculation is channel
A-B or B-A.
• in a ratio measurement whether the calculation is A/B or B/A.
Entering a <source list> is only relevant if you are using an
HP E4419B. As the HP E4418B only has a single channel the source list
can only be channel A.
HP E4418B/E4419B Programming Guide
MEASurement Instructions
MEASurement Instructions
2-3