Keysight Technologies 86120B User Manual page 229

filled in.
10 Disconnect the fiber-optic cable from the optical power meter and connect it to the
Keysight 86120B's OPTICAL INPUT connector.
11 Set the optical attenuator for the value that you recorded in
12 Place the polarization controller in the auto scan mode.
13 Press the Keysight 86120B's front-panel Preset key.
14 Press List by Power, Appl's, and then DRIFT.
15 After two minutes, stop the polarization controller's auto scan function.
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
correction offset value as shown in the following equation:
minimum drift
-------------------------------------------------------------------------- - Pwr
offset =
Enter the calculate value on the following line:
power-correction offset: ____________
19 Change the attenuator to the settings shown in
the power measured on the Keysight 86120B.
After completing this step, the table's column titled "Keysight 86120B Power Read-
ing" should be completely filled in.
20 Calculate the "Linearity" value for each row in the table using the following
equation:
Linearity = Power Meter Reading HP 86120B Power Reading
21 Compare the linearity values with the specification listed in
"Specifications and Regulatory
plateaus separated by small amplitude steps. This is not a problem as long as the
Test 5. Amplitude Accuracy and Linearity
Step 8, Step 16, and Step 17
+ maximum drift
–
2
Table
–
Information". The data may show multiple amplitude
Performance Tests
Step 8.
to calculate the power-
6-22. For each setting, record
– offset
Chapter 7,
227