Model 621 User’s Manual APPENDIX E – TROUBLESHOOTING
Bristol Instruments, Inc. 36
APPENDIX E – TROUBLESHOOTING
The 621 Laser Wavelength Meter continually checks the quality of the signal it is
analyzing and alerts the user to unusual conditions that might affect the precision of the
wavelength measurement.
Error Messages
The following table provides a list of error messages and what they mean. If an error
message is displayed, please call Bristol Instruments for additional information and/or
instructions.
The instrument has detected a power measurement
that is outside of the specified range of the instrument.
This indicates that the internal HeNe reference laser of
the model A has not stabilized yet.
Temperature Out of
Bounds
This indicates that the instrument temperature is
outside of the allowed range of 0C to 50C for the
temperature sensor, or that there is a problem with the
sensor. Measurement will continue using the
temperature at the end of the allowed range closest to
the temperature sensor’s reading.
This indicates that the ambient pressure is outside of
the allowed range of 500 to 900 mm Hg, or that there is
a problem with the pressure sensor. Measurement will
continue using the pressure at the end of the allowed
range closest to the pressure sensor’s reading.
The instrument has detected a wavelength that is
outside the operating range of the instrument.
The instrument has detected that there are insufficient
reference fringes to perform an accurate measurement.
This may be due to either a failing reference laser, or
misalignment in the interferometer.
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