Agilent Technologies 86121A, User Manual, Page: 189 / 240

6
-
12 Test 5. Amplitude Accuracy and Linearity
measurements.
After completing this step, the first two columns of the
table should be completely filled in.
10 Disconnect the fiber-optic cable from the optical power
meter and connect it to the
OPTICAL INPUT
connector of
the Agilent 86121A.
11 Set the optical attenuator for the value that you
recorded in
Step 8 .
12 Place the polarization controller in the auto scan mode.
13 Press the front-panel
Preset
key of the Agilent 86121.
14 Press
List by Power
,
Appl’s,
and then
DRIFT
.
15 After two minutes, stop the auto scan function on the
polarization controller.
16 Press the
MAX-MIN
softkey so that
MAX
is highlighted.
Enter the maximum drift reading on the following line:
maximum drift: ____________
17 Press the
MAX-MIN
softkey so that
MIN
is highlighted.
Enter the minimum drift reading on the following line:
minimum drift: ____________
18 Use the values recorded in Step 8 , Step 16 , and Step 17
to calculate the power-correction offset value as shown
in the following equation:
Enter the calculated value on the following line:
power-correction offset: ____________
19 Change the attenuator to the settings shown in
Table 6-1 . For each setting, record the power measured
on the Agilent 86121A.
After completing this step, the table’s column titled
“Agilent 86121A Power Reading” should be completely
filled in.
20 Calculate the “Linearity” value for each row in the table
using the following equation:
offset
minimum drift maximum drift +
2
------------------------------------------------------------------------------------------- Pwr – =
Linearity Power Meter Reading
HP
86121
A
–
offset
– =