Bristol 428 - Appendix E: Troubleshooting; Main Display Error Messages

Model 428 User’s Manual APPENDIX E – TROUBLESHOOTING
Bristol Instruments, Inc. 66
APPENDIX E – TROUBLESHOOTING
The 428 Multi-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.
Main Display Error Messages
The following table provides a list of error messages displayed on the instrument’s Front
Panel and what they mean. If an error message is displayed, please call Bristol
Instruments for additional information and/or instructions.
Error Message
Description
Wavelength Range Error
The wavelength (or frequency) measurement is outside
of the specified range of the instrument.
Reference Laser Error
This indicates that the internal HeNe reference laser is
not operating properly.
System Temperature
Error
This indicates that the instrument temperature is outside
of the allowed range of 0 to 50C, or that there is a
problem with the temperature sensor. Measurement will
continue using the temperature at the end of the allowed
range closest to the temperature sensor’s reading.
Pressure Range Error
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.
Input Power Too High
The instrument has detected an input power level that is
beyond the 30 mW allowed safe limit. Measurement will
be suspended when this message is displayed.
Input Power Too Low
The instrument has detected an input power level below
the minimum input required. Measurement will continue
but not be within specified accuracy and/or repeatability
limits.