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M400E Ozone Analyzer Operator’s Manual M400E Calibration Procedures
9.5. O
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PHOTOMETER ELECTRONIC CALIBRATION
There are several electronic characteristics of the M400E analyzer’s photometer that may occasionally need
checking or calibration:
9.5.1. PHOTOMETER DARK CALIBRATION
The dark calibration test turns off the photometer UV lampand records any offset signal level of the UV detector-
preamp-voltage to frequency converter circuitry. This allows the instrument to compensate for any voltage levels
inherent in the Photometer detection circuit that might affect the output of the detector circuitry and therefore the
calculation of O
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concentration.
To activate the dark calibration feature, press:
04315 Rev. C1 167