Teledyne 450H 3.5Diagnostics DIAG, 3.5.1Zero Calibration, 3.5.2 D/A Calibration, Analog Output

3.5Diagnostics (DIAG)

3.5.1Zero Calibration

This menu is used for performing manual zero calibration of the M450H. If the Auto-Zero option has been installed and the USE_ZERO_VALVE variable has been enabled (See Section 3.5) then this calibration can be done using gas from the Zero Gas inlet port on the monitor. If this valve is not used, then the zero calibration gas must be supplied at the Ozone Inlet port. To zero the monitor press the ZERO button once. This button will now change to ENTR. Press this button once more to confirm the calibration. The Ozone concentration reading should now go to zero.

3.5.2 D/A Calibration

This menu is used for the calibration of the internal A/D converter and DACs on the V/F Card. This procedure is performed at the factory and should not need to be performed again unless the analog output voltage range is changed or the V/F Card is replaced. For details on performing this calibration see Section 5.3.

3.5.3 Analog Output

This diagnostic function will step the analog output through it’s full scale range in 20% increments, ie. 0% - 20% - 40% - 60% - 80% - 100%. The function pauses for several seconds at each level. To freeze the analog output at a particular level, press and release the button under the % display. Pressing the button again will resume the cycling. This function is useful for calibrating instruments connected to the analog output.

3.5.4 RS232 Output

This diagnostic function outputs a string of w’s out the RS232 port and is used for troubleshooting RS232 connections to a computer. For more details on the use of the RS232 interface, please contact Teledyne API and request document number 01350.

P/N 02826B1 Teledyne API Model 450H O3 Monitor Instruction Manual - Page 38