User`s guide

8
Example 2:
Frequency list measurement with
manually entered corrections
The following example demonstrates how to enter
correction data when using a power meter other
than the 437B (see figure 8 for the system configu-
ration). This example also introduces two features
of the 8360: frequency follow, which simplifies the
data entry process, and list mode, which 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
correction data. Simultaneously, the source test
frequency is updated to the selected correction
frequency without exiting the correction table.
To further simplify the data entry process, the
8360 allows the user 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 will automatically calculate
the appropriate correction and enter it into the
table. If the user already has a table of correction
data prepared, it can be entered directly into the
correction table from the keypad on the front
panel of the 8360.
With the list mode feature, the user 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 8360
will step 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 will be determined as if no
offset is entered. When user flatness correction and
list mode (with offsets) are enabled, the 8360 will
adjust the output power by an amount equivalent
to the sum of the correction data and offset for
each test frequency. The user must make sure that
the resulting power level is still within the ALC
range of the source.
Figure 8. Basic system configuration for applications using a power meter other than the 437B
8360
synthesized sweeper
Cables, switches,
etc.
Power meter
Test port
Power sensor
DUT