EXFO IQS-12004B DWDM Passive Component Test System for IQS-500 - Manual (Page 367)

COM Objects Reference
DWDM Passive Component Test System 355
Analysis Interface—Methods
Analysis GetDriftTrace
Description This method returns a calculated trace that acts as an offset that
can be applied to acquired traces for periodic testing.
Syntax object.GetDriftTrace
Parameters None
Response This method returns a Variant value containing a
two-dimensional array representing pairs of X,Y coordinates of
the trace.
Note This method computes a trace based on those that have been
set through the use of the AddRefExtZeroTrace and
AddRefExtTrace methods. If either one of the latter methods has
not been used correctly, the GetDriftTrace method will fail.
Once you have retrieved this drift trace, you can apply it to
previously acquired traces you have stored somewhere using
your own algorithm. If you prefer, you can use the
GetCorrectedIlTrace method to apply this offset.
This offset may be used to compensate for intrinsic deviation of
the system, mainly caused by the repeatability of the switch.
Use this method in conjunction with the following method:
GetCorrectedIlTrace.