128 Principles of Operation
When the system performs frequency measurements the analog filter is
ignored.
9.11 Common Measurement Errors
The most common sources of optical measurement error are listed in Table 6
below. Other common errors are discussed in the preceding subsections of
Measurement Considerations.
Check that all of the light is actually hitting the
detector
Check that any ambient light was ZEROed before
the measurement was made.
Check that the calibration factor for the
measurement wavelength is properly set.
Detector saturation or
damage
Check that the optical power density remains below
the detector’s saturation or damage
Table 6 Common Measurement Errors
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