5-43
Servicing
Adjustment Procedures
jPress user pattern and then INTERNL PATT 1.
8Adjust the ECL –1 ADJ potentiometer so that the optical power measures
+1.5d Bm.
9On the pattern generator, press the left-side select pattern softkey.
10 Press the 2 23–1 softkey.
11 Locate the test points that are labeled “P4” on the A2 Main Board Assembly.
Measure the voltage across pins 15 and 16 (LOOP test points).
12 Adjust the DRIVE ADJ potentiometer so that the voltage measured across pins 15
and 16 varies less than 20 mV when the pattern generator signal is present and
then removed.
13 Disconnect the pattern generator signal from the Agilent 83430A.
14 Press the front-panel SELECT key so that the ANALOG IN AC COUPLED connector is
selected. No signal should be connected to this input.
15 Adjust the ANALOG BIAS potentiometer so that the optical power measured at
the front-panel OPTICAL OUT connector is –1.5 dBm ±0.2 dB.
16 Turn the Agilent83430A’s LINE switch off.