HP 8360 B Series, User Manual

Page: 64 / 496

Creating a User Flatness Array, Example 2
This example shows how to use the swept signal generator and a
power meter in manual entry mode. This example also introduces
two features of the swept signal generator. The
Freq Follow
simplifies the data entry process and the
List Mode sets
up
a list of arbitrary test frequencies.
The frequency follow feature automatically sets the source to a CW
test frequency equivalent to the active correction frequency in the
user flatness correction table. The front panel arrow keys are used
to move around the correction table and enter frequency-correction
pairs. Simultaneously, the swept signal generator test frequency
is updated to the selected correction frequency without exiting the
correction table.
To further simplify the data entry process, the swept signal generator
allows you to enter correction data into the user flatness correction
table by adjusting the front panel knob until the desired power
level is displayed on the power meter. The user flatness correction
algorithm automatically calculates the appropriate correction and
enters it into the table. If you already have a table of correction data
prepared, it can be entered directly into the correction table using
the front-panel keypad of the swept signal generator.
With the list mode feature, you may enter the test frequencies into
a table in any order and specify an offset (power) and/or a dwell
time for each frequency. When list mode is enabled, the swept signal
generator steps through the list of frequencies in the order entered.
The user flatness correction feature has the capability of copying and
entering the frequency list into the correction table. Since the offset
in the list mode table is not active during the user flatness correction
data entry process, the value of the correction data is determined as
if no offset is entered. When user flatness correction and list mode
(with offsets) are enabled, the swept signal generator adjusts the
output power by an amount equivalent to the sum of the correction
data and offset for each test frequency. You must make sure that the
resulting power level is still within the ALC range of the swept signal
generator.
1-36 Getting Started Advanced