5-24
Servicing
Adjustment Procedure
To adjust total power
Description The total power is adjusted by a potentiometer. The potentiometer is located
on the A5 Laser Driver Board Assembly.
Procedure
1Remove the instrument’s top and bottom covers.
2Connect a power meter to the Agilent 83438A’s front-panel OPTICAL OUT
connector.
3Locate R18 on the A5 Laser driver board assembly for the pump laser. See the
following figure.
4Adjust potentiometer R18 on the A5 Laser driver board assembly to set the
output power between +5.5 dBm and +8.1 dBm (3.6 mW to 6.5 mW).