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28 BENCH_TEMP NO Optical Bench temp. Typically 2270
mV for 48 C
29 WHEEL_TEMP NO Filter Wheel temp. Typically 4770
mV for 68 C
30 BOX_TEMP NO Internal analyzer temp in mV
31 DCPS_VOLTAGE NO DC power supply composite voltage
output. Typically 2500 mV.
32 DAC_CHAN_0 NO Output of DAC 0(REC) in mV.
33 DAC_CHAN_1 NO Output of DAC 1(DAS) in mV.
34 DAC_CHAN_2 NO Output of DAC 2(TEST) in mV.
35 DAC_CHAN_3 NO Output of DAC 3(Spare) in mV.
36 CO_CONC_1 YES CO Reading (REC) in mV
37 CO_CONC_2 YES CO Reading (DAS) in mV
38 TEST_OUTPUT YES Test Channel in mV
TABLE 5.2 I/O SIGNALS
5.2.3 D/A output
This test cycles 3 of the analog output channels from 0% to 100% of Full Scale in 20%
FS steps. It starts by outputting 0 volts to all four channels and displaying a 0% button.
Then, every five seconds, the output is increased 20% FS and the button is changed
accordingly. Thus, the button (and the analog outputs) will cycle through the following
value
0%, 20%, 40%, 60%, 80%, 100%, 0%, ...
To pause the output at the current voltage, press the n% button. To resume automatic
cycling, press the n% button again.
5.2.4 Electric Test
This test activates a diagnostic circuit located on the Synchronous Demodulator board
which generates an artificial signal which simulates the output of the IR detector. This
signal is injected in place of the detector output.
When activated, Electric Test will automatically switch the analyzer into a 50 ppm range
and result in the Analyzer producing a constant, stable output (i.e. CO reading) of about
40 ppm. This test is particularly useful in isolating problems, since it exercises
essentially all electronic sub-systems of the Analyzer but does not depend on the proper
function of Optical or Pneumatic subsystems.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 57