Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J1
Table 9-5: UV Source Lamp And Detector Diagnostics
UV Source Lamp and Detector Diagnostics
O
3
REF Value
Meaning
4700 mV to 5000 mV
The Source Lamp and Detector are operating, but
adjustment is required.
4000 mV to 4700 mV
The Source Lamp and Detector are operating
properly; no adjustment is needed.
2500 mV to 4000 mV
The Source Lamp and Detector are operating.
Adjustment is useful but not required.
175 mV to 2500 mV
The Source Lamp and Detector are operating, but
adjustment is required.
75 mV to 175 mV
Either the Source Lamp or the UV detector is not
functioning.
Less than 75 mV
The Detector Pre-Amp or V/F Board has failed or is
disconnected.
WARNING
UV light present. Do not look directly at the UV lamp since UV
light could cause eye damage. Always use safety glasses or view
through glass.
Adjustment Required or Adjustment Useful
Adjust the Lamp and Detector Preamp as described in Section 8.8. If it is not possible to achieve
an acceptable O
3
REF test value by means of adjustment, it is possible that the lamp has
deteriorated beyond its useful range and should be replaced.
Lamp or Detector Failure
The O
3
REF value of approximately 125 mV usually indicates a total failure of either the source
lamp or the detector. To determine which component is at fault, remove the top cover of the
optical bench and observe the "lamp end" of the glass absorption tube. If a blue-white light is
visible, the lamp is operating and the detector is at fault and should be replaced. If no light is
visible, the lamp power supply should be checked as described in Section 9.6.8. If the Lamp
Power Supply check is satisfactory, then the lamp has failed and should be replaced.
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