T R O U B L E S H O O T I N G
Hardware Troubleshooting Guide
102
OMM-6810B
C H A P T E R
6
Display shows “HI-
”
•
This condition will only occur with wavelength
measurement heads when the measured wavelength is
greater than the specified maximum wavelength for that
head.
Display shows “LO-
”
•
This condition will only occur with wavelength
measurement heads when the measured wavelength is
less than the specified minimum wavelength for that
head.
Display shows “-OL-”
•
This condition occurs when the laser’s input power
exceeds the maximum allowed for the selected gain
range. Measurements at this level are invalid. If in
manual mode, press the POWER DOWN switch to
select the next lower gain range. If in autoranging
mode, attenuate the input signal using beam splitters or
mirrors.
Measurements are not accurate at a known
wavelength standard
•
Be certain the zeroing procedure has been performed
correctly as described in Chapter 2.
•
It may be necessary to perform the User Calibration as
described in Chapter 6 of the instruction manual for the
measurement head.
•
The source may be too close to the head and is emitting
non-lasing radiation into the aperture.
Measurements are not accurate at known power
standard
•
Be certain the zeroing procedure has been performed
correctly as described in Chapter 2.
•
It may be necessary to perform the User Calibration as
described in Chapter 6 of the instruction manual for the
measurement head.
•
The source may be too close to the head and is emitting
non-lasing radiation into the aperture.
Symptom
Corrective Action
