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6-10
Performance Tests
Test 5. Amplitude Accuracy and Linearity
After completing this step, the first two columns of the table should be com-
pletely filled in.
10
Disconnect the fiber-optic cable from the optical power meter and connect it
to the Agilent 86120B’s
OPTICAL INPUT
connector.
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 Agilent 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 Step 8, Step 16, and Step 17 to calculate the power-
correction offset value as shown in the following equation:
Enter the calculate 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 86120B.
After completing this step, the table’s column titled “Agilent 86120B Power
Reading” should be completely filled in.
20
Calculate the “Linearity” value for each row in the table using the following
equation:
21
Compare the linearity values with the specification listed in Chapter 7,
“Specifications and Regulatory Information”. The data may show multiple
offset
minimum drift maximum drift
+
2
-------------------------------------------------------------------------------------------
Pwr
–=
Linearity Power Meter Reading HP 86120B Power Reading
–
offset
–=