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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
CAUTION
UV light present. Do not pull the lamp from the optical
bench assembly.
3. Adjust the UV Detector Pre-Amp gain as follows:
a. Remove the access cap on the Detector cover at the front end of the optical bench, and
adjust the pot (R7) until the O
3
REF reading on the display is 4500 mV ± 50 mV.
b. If it is still not possible to achieve a 4500 mV O
3
REF reading, increase the UV lamp
drive power by adjusting the lamp power supply as described in Step 1. (DO NOT,
however, allow the voltage measured across the TP7 and TP10 to exceed 21 volts.)
4. Re-calibrate the automatic Detector Dark Current compensation by pressing SETUP-MISC-
DARK-CAL at the front panel. See Section 9.3 for dark current adjustment procedure.
8.9 Ozone Generator Lamp Setup
This procedure only needs to be done if the lamp is replaced or if the lamp is accidentally
moved. The procedure adjusts the lamp for optimum operation of the O
3
generator and its
feedback circuit.
1. Enter the SETUP menu by pressing SETUP-MISC-O3-GEN-ADJ. This causes the lamp
drive circuit to output a constant 2.5 V.
If you are installing a new lamp, allow approximately 30 min for lamp output to stabilize.
2. Select the "O3 GEN" TEST function on the front panel display. Loosen the O
3
generating
lamp and rotate until the reading on the display is 2500 mv
± 500 mV.
CAUTION
UV light present. Do not pull the lamp from the IZS assembly.
Re-tighten the hold-down screws securing the ozone lamp to the O
3
generator assembly.
3. Remove access cap from the O
3
generator preamp cover and adjust the pot to refine the front
panel reading to 2500 mv
± 25.
4. The O
3
generator lamp and feedback circuit are now set up. Proceed to Section 8.11 to finish
calibration of the O
3
generator.
8-8