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Teledyne API – Model T300/T300M CO Analyzer Setup Menu
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5.9.4. ELECTRICAL TEST
The electrical test function creates a current, which substitutes the PMT signal, and
feeds it into the preamplifier board. This signal is generated by circuitry on the pre-
amplifier board itself and tests the filtering and amplification functions of that assembly
along with the A/D converter on the motherboard. It does not test the PMT itself. (See
also Section
12.5.7.2).
5.9.5. DARK CALIBRATION
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 affect the
calculation of CO concentration. For details see Section 9.6.1.
5.9.6. PRESSURE CALIBRATION
A sensor at the exit of the sample chamber continuously measures the pressure of the
sample gas. The data are used to compensate the final CO concentration calculation for
changes in atmospheric pressure and are stored in the CPU’s memory as the test function
PRES (also viewable via the front panel). For details see Section 9.6.2.
06864B DCN6314