Teledyne gfc 7000ta operation manual Dark Calibration Test, Repeat Pressing Next until

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer

6.13.6. Dark Calibration Test

The dark calibration test interrupts the signal path between the IR photo-detector and the remainder of the sync/demod board circuitry. This allows the instrument to compensate for any voltage levels inherent in the sync/demod circuitry that might effect the calculation of CO2 concentration. Performing this calibration returns two offset voltages, One for CO2 MEAS and on for CO2 REF that are automatically added to the CPU’s calculation routine. The two offset voltages from the last calibration procedure may be reviewed by the user via the front panel display.

To activate the dark calibration procedure or review the results of a previous calibration, press:

SAMPLE	RANGE = 500.000 PPM	CO2 =X.XXX
< TST TST > CAL		SETUP

SETUP X.X	PRIMARY SETUP MENU
CFG DAS RNGE PASS CLK MORE		EXIT
SETUP X.X	SECONDARY SETUP MENU
COMM VARS DIAG ALRM		EXIT

SETUP X.X	ENTER DIAG PASS: 818
8 1 8	ENTR EXIT

Electric offset for Reference signal

DIAG DARK REF DARK OFFSET: 0.0 mV

EXIT

Electric offset for Measurement signal

DIAG DARK MEAS DARK OFFSET: 0.0 mV

EXIT

DIAG	SIGNAL I / O
NEXT	ENTR	EXIT

Repeat Pressing NEXT until . . .

DIAG			DARK CALIBRATION
PREV NEXT			ENTR	EXIT
DIAG DARK			CO2 DARK CALIBRATION			Exit returns
	VIEW CAL			EXIT			to the
						previous menu
			Calibration runs automatically
							Display
		DIAG DARK DARK CAL 1% COMPLETE
							tracks %
					EXIT		complete
		DIAG DARK DARK CALIBRATION ABORTED

Teledyne Analytical Instruments 137