Teledyne 300 5.2.3 D/A output, Electric Test, 2 I/O SIGNALS, 0%, 20%, 40%, 60%, 80%, 100%, 0%

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