Model 300E Carbon Monoxide Analyzer
Instruction Manual
Operating Instructions
P/N 04288 REV: A
85
6.6.5.
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 CO concentration. Performing this calibration returns
two offset voltages, One for
CO MEAS
and on for
CO 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:
Calibration runs automaitcally
Electric offset for Measurement signal
Electric offset for Reference signal
SAMPLE
RANGE = 50.0 PPM
CO =
< TST TST > CAL
SETUP
SETUP C.3
CFG DAS
RNGE
PASS CLK
MORE
EXIT
SETUP C.3
COMM VARS
DIAG
HALT
EXIT
Exit at Any
Time to Return
to main the
SETUP Menu
DIAG
SIGNAL I / O
NEXT
ENTR
EXIT
Exit returns
to the
previous menu
SETUP C.3
ENTER DIAG PASS: 818
8 1 8
ENTR
EXIT
Repeat Pressing
NEXT
unti . . .
DIAG
DARK CALIBRATION
PREV NEXT
ENTR
EXIT
DIAG DARK
CO DARK CALIBRATION
VIEW CAL
EXIT
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