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10.4 Troubleshooting using test function values
The Model 300 provides the capability to display, on operator demand, the values of Test
Functions which allow the observation of key analyzer operating parameters. These Test
Functions can be accessed by depressing the TEST Button on the instrument's front
panel, with each depression of the button causing the next test function to be displayed.
By comparing the values of Test Functions to acceptable operating limits, it is possible to
quickly isolate and correct most problems.
Table 10-2 provides a list of available Test Functions along with their meaning, their
range of acceptable values, and the recommended corrective actions if the value is not in
the acceptable range. Additionally, Table 1-1 in this manual provides a list of the values
of all Test Functions at the time the analyzer left the factory.
TEST FUNCTION VALUES
Test Function Meaning Acceptable Values Corrective Action
for Unacceptable
Values
RANGE The Current Full
Scale Range Setting
of the analyzer's
analog outputs
Any None required
CO MEAS The most recent
detector reading
taken in Measure
mode
2000-4800 CNTS Check and adjust IR
source and Sync
Demodulator and
optical alignment as
described in Sect.
10.6.6 and 10.6.8
CO REF The most recent
detector reading
taken in Reference
mode
2000-4800 mV Check and adjust IR
source and Sync
Demodulator and
optical alignment as
described in Sect.
10.6.6 and 10.6.8
MR RATIO The ratio of the CO
MEAS value to CO
REF value
1.00-1.25 Check CO REF and
CO MEAS values as
described above.
NOTE
IF THE VALUE OF ANY TEST FUNCTION IS DISPLAYED
AS “XXXX”, THIS INDICATES THAT THE READING IS
OFF SCALE OR OTHERWISE NON-VALID.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 87