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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
To view the current dark offset, press SETUP-MISC-DARK-VAL. Press EXIT when finished.
No password is required to view the dark offset, only to change it.
8.12 Bench Feedback Option
The Bench Feedback Option uses the Photometer to control the lamp drive current. This option
assures very stable and repeatable ozone concentrations. Press SETUP-MISC-O3-GEN-MODE-
BNCH to activate this option. It is recommended to select the bench feedback mode for stable
and precise O
3
calibration gas.
8-10