Photometer Zero Calibration; Photometer Span Calibration; Figure 6-7. O 3 Photometer Bench Cal Page - Teledyne T750 User Manual

Photometer Zero Calibration

To set the zero point offset for the portable calibrator's photometer:
1. Ensure that the calibrator is in Standby mode (Generate menu).
2. Navigate to the Utilities>Diagnostics>Bench Cal menu.
3. Press either the Zero button if using the internal O
if using an external O
4. Allow Zero air to flow into the PHOTO IN port for at least 10 minutes.
5. In the Status field press the Calibrate button.
6. On the next screen, either confirm performing the Bench Calibration by pressing
Yes, or leave photometer bench calibration values unchanged by pressing No,
which will return the display to the Bench Cal page.

Photometer Span Calibration

To set the response SLOPE for the portable calibrator's photometer:
1. Ensure that the calibrator is in Standby mode (Generate menu).
In the Utilities>Diagnostics>Bench Cal menu, press either the Span button if
2.
using the internal O
generator.
3. Allow calibration gas (a 400 ppb O
into the PHOTO IN port for at least 10 minutes.
4. In the O3 Conc PPB field press the button for Actual and input the exact span cal
value as measured by the reference photometer, then press Enter.
5. In the Status field press the Calibrate button.
6. On the next screen, either confirm performing the Bench Calibration by pressing
Yes, or leave photometer bench calibration values unchanged by pressing No,
which will return the display to the Bench Cal page.
110
Figure 6-7. O Photometer Bench Cal Page
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generator.
3
generator or the XSpan button if using an external O
3
generator or the XZero button
3
span concentration is recommended) to flow
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083730750B DCN8606
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