EXFO IQS-12004B DWDM Passive Component Test System for IQS-500 - Manual (Page 136)

Testing Multiple DUTs with the LabVIEW Application
124 IQS-12004B
Nulling Electrical Offsets
Nulling Electrical Offsets
This feature allows you to perform an electrical offset nulling of the power
meters. For more information, see Nulling Electrical Offsets on page 75.
To null the electrical offsets:
1. If the System menu is grayed out, that means no test has been created
since the application was started. Consequently, no nulling can be
performed until you start a new test. For more information, see Starting
a New Test on page 118.
2. Select Nulling from the System menu of the main window.
3. Put protective caps on power meter detectors as well as on the input
and output of the IQS-9401 WRM as described at the top of the dialog
box.
4. During a nulling, no light should reach the detectors. To avoid
disconnecting the rigid patchcords, click Turn Source Off. The source
and the EDFA will be turned off as soon as you press Start. Once the
nulling is complete, the source is automatically turned on.
5. Click Start to start the null measurement. The Instruction box displays
Nulling in progress.
6. When the operation has been completed, the Instruction box content
changes to Nulling completed. Click Close to return to the main
window.