Teledyne 200A, Instruction Manual, Page: 158 / 220

Teledyne API Model 200A NO
X
Analyzer Instruction Manual, 02246, Rev. F1
Table 9-4: Diagnostic Mode - Signal I/O (Continued)
No. Signal Control Description
35 DAC_CHAN_0 NO Output of NO
x
channel in mV.
36 DAC_CHAN_1 NO Output of NO channel in mV.
37 DAC_CHAN_2 NO Output of NO
2
channel in mV.
38 DAC_CHAN_3 NO Test Channel output. Not implemented in current
software.
39 NOX_CONC YES NO
x
DAC programming voltage. The following 4
signals can be set to output specific voltages to each
DAC. Use in conjunction with ANALOG OUTPUT
test to check each DAC output channel. The value
keyed in should appear on the the appropriate analog
output channel. This value overrides data being
written from the analyzer. Value reverts to instrument
output when function is exited.
40 NO_CONC YES NO DAC programming voltage. See above for
description.
41 NO2_CONC YES NO
2
DAC programming voltage. See above for
description.
42 TEST_OUTPUT YES TEST channel programming voltage. See above for
description.
9.1.3.2 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 NO, NO
x
concentrations, the NO
2
concentration should be near zero. Likewise the
analog outputs should produce a smooth quiet trace on a strip chart.
Procedure:
1. Scroll the TEST function to PMT.
2. Press SETUP-MORE-DIAG, then scroll to ELECT TEST by pressing the NEXT button.
When ET appears, press ENTR to turn it on.
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