Model 671 User’s Manual APPENDIX F – LOGGED STATUS MESSAGES
Bristol Instruments, Inc. 59
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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