Operating Instructions Model 360E Instruction Manual

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:

SETUP X.X ENTER DIAG PASS: 818

8 1 8 ENTR EXIT

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
Calibration runs automatically
Electric offset for Measurement signal
Electric offset for Reference signal
DIAG SIGNAL I / O
NEXT ENTR EXIT

Repeat Pressing NEXT until . . .

DIAG DARK REF DARK OFFSET: 0.0 mV
EXIT
DIAG DARK MEAS DARK OFFSET: 0.0 mV
EXIT
DIAG DARK DARK CAL 1% COMPLETE
EXIT
DIAG DARK DARK CALIBRATION ABORTED
EXIT
Display
tracks %
complete
DIAG DARK CALIBRATION
PREV NEXT ENTR EXIT
Exit returns
to the
previous menu
DIAG DARK CO DARK CALIBRATION
VIEW CAL EXIT

118 05232 Rev B3