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General Troubleshooting & Repair Teledyne API T703 Calibrator Operation Manual
212
11.5.2. CHECKING MEASURE / REFERENCE VALVE
To check the function of the photometer’s measure / reference valve:
1. Set the calibrator’s front panel display to show the PHOTO REFERENCE test function (see Section 6.1).
2.
Follow the instruction in Sections 8.1.1 a
nd 8.1.3.1 for performing a zero point calibration of the
photomete
r
.
Press XZRO and allow the calibrator to stabilize.
3. Before completing the calibration by pressing the ZERO key, note of the displayed value.
4. Press the final Zero key, then press “NO” when asked, “ARE YOU SURE”.
5. Follow the instruction in Section 8.1.3.2 for performing a span point calibration of the photometer.
Press
XSPN
and allow the calibrator to stabilize.
6. Before completing the calibration by pressing the SPAN key, note of the displayed value of PHOTO
REF.
If the O
3
REF value has decreased by more than 2 mV from its value with Zero-gas, then there is a
"cross-port" leak in the m/r valve.
7. Press the final Zero key then press “NO” when asked, “ARE YOU SURE”.
07223B DCN6378