EXFO IQS-1600 High-Speed Power Meter for IQS-500/600 - Manual (Page 106)

Typical Applications
98 IQS-1600
Testing Instrument Linearity
With an IQS-1640 Four-Channel Power Meter, the previous procedure could
be used to perform four simultaneous insertion loss measurements as
shown in the figure below.
Testing Instrument Linearity
As stated in Measuring Insertion Loss on page 96, absolute power levels are
not particularly significant when measuring the insertion loss of a
fiber-optic component.
In calculating insertion loss, we are essentially measuring the difference
between the power in and the power out of a DUT. To accurately measure
that difference, instrument linearity is very important.
Your high-speed power meter is specified as being very linear. Not only is it
ideal for measuring insertion loss, it is also suitable as a reference
instrument for determining the linearity of other fiber-optic components
such as attenuators, other power meters, and optical detectors.
When verifying instrument linearity, a linear variable attenuator (such as
EXFO’s IQS-3100 Variable Attenuator) is also required. Before verifying the
linearity of an optical detector, you must confirm the linearity of the
attenuator being used.
C1
C2
C3
E
XFO
N TT
-FC
Sync
Sync In
4-Ch Power Meter
IQS-1600
C4
Out
Trig
DUT 1
DUT 2
DUT 3
DUT 4
1 x N splitter
IQ-1640 Four-Channel
Power Meter
IQ-2100
Light Source
Light Source
IQS-2100
ACTIVE