Specifications

MEASurement Instructions

Agilent E4418B/E4419B Programming Guide 2-3

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 Agilent E-series power sensor. With Agilent 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

GP-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

Agilent E4419B. As the Agilent E4418B only has a single channel the

source list can only be channel A.

prog.book Page 3 Thursday, June 7, 2001 2:55 PM