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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
Table 10-4: Diagnostic Mode - Signal I/O (Continued)
No. Signal Control Description
31. HVPS_VOLTAG NO HVPS programming voltage. Output of HVPS is
1000x value present.
32. DAC_CHAN_0 NO Output of SO
2
(DAC0/RANGE1) in mV.
33. DAC_CHAN_1 NO Output of SO
2
(DAC1/RANGE2) in mV.
34. DAC_CHAN_2 NO Output of spare (DAC2) channel in mV.
35. DAC_CHAN_3 NO Test Channel (DAC3) output.
36. UVLAMP_SIGNAL NO Current UV lamp signal voltage in mV. Same as
UV LAMP in TEST menu. Bi-polar, typically 0-
5000 mV range. A constant value of 5000 mV
indicates off scale.
37. CONC_OUT_1 YES DAC0 (SO2/RANGE1) analog output in mV.
38. CONC_OUT_2 YES DAC1 (SO2/RANGE2) analog output in mV.
39. TEST_OUTPUT YES DAC3 (TEST CHANNEL) analog output in mV.
10.1.3.2 Electric Test
This function injects a constant voltage between the preamplifier and the buffer amplifier on the
preamp board. Electric test checks part of the Preamp, the V/F and computer for proper functioning.
The result of electric test should be a smooth quiet signal as shown by constant values for the SO
2
concentration. Likewise the analog outputs should produce a smooth quiet trace on a strip chart
(analog output range is set to 5000PPM and auto-ranging is disabled).
Procedure:
1. Scroll the TEST function to PMT.
2. Press SETUP-MORE-DIAG, scroll to ELECT TEST by pressing the NEXT button. When
ET appears, press ENTR to turn it on.
3. The value in PMT should come up to 2000 mV ± 100 mV in less than 15 sec.
10-16