EXFO IQS-1500 Power Meters for IQS-500/600 - Manual (Page 76)

Calibrating Other Power Meters with the IQS-1500
68 IQS-1100/IQS-1500
Entering Calibration Uncertainties
If a fiber different than the one used for the calibration of the IQS-1500 is
used, a large error can occur, especially because of the connector. Even
though the same fiber is used, the repeatability of the connection on both
power meters must be measured and taken into account.
The Setup reproducibility also has to be measured and recorded.
Movements of the fibers are mainly responsible for this error type.
Note: APC connectors should be avoided at the detector port because of their
sensitivity to polarization.
In addition, any other systematic error may be entered and included in the
total uncertainty calculation.
Type B uncertainty components are assumed to be independent and have
rectangular distributions. The following sources of information may be
helpful in evaluating these Type B uncertainties:
³
Previous measurement data
³
Manufacturer’s specifications
³
Data provided in calibration and other reports
Type A uncertainties are also assumed to be independent, but normally
distributed; therefore, they can be estimated by performing a series of
measurements and calculating a standard deviation.