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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
If the HVPS or the span gain adjust on the preamp card has been changed without doing a
FACTORY CALIBRATE the reading in step 3 may be different than 2000 mV, since the overall
calibration affects ELECTRIC TEST. See Section 10.1.6 for factory calibration procedure.
4. To turn off ET press EXIT
If ET is a steady 2000 ± 100 mV, that means the Power Supply Module, Preamp buffer amplifier,
V/F, CPU, and display are all working properly.
10.1.3.3 Optic Test
Optic test turns on a small LED inside the PMT housing which simulates the signal from the
reaction cell. OT tests the entire signal detection subsystem. By observing the level, noise and
drift of this test, correct operation of many sections of the analyzer can be verified.
The implementation of OT involves several changes to the instrument operating conditions. The
M100AH does the following when switching to optic test:
1. Save the current instrument setup as to autorange, dual range, current range. D/A analog
output is set at 5000 PPM range and auto-ranging is disabled.
2. Manually allow to sample zero gas to avoid unwanted sample measurement.
3. Select SETUP-MORE-DIAG, scroll to select the optic test and push ENTR button.
4. The PMT reading in TEST functions should be 200 ± 20 mV.
If the HVPS or the span gain adjust on the preamp card has been changed without doing a
FACTORY CALIBRATE, the reading in step 4 may be different than 200 mV, since the overall
calibration affects OPTIC TEST. Also if the SO
2
concentration display is not within the nominal
range of 200 ± 20 PPM, the lamp ratio may need to be updated. See Section 10.1.6 for factory
calibration procedure.
10.1.3.4 Analog Out Step Test
The Step Test is used to test the functioning of the 4 DAC outputs on the V/F board. The test
consists of stepping each analog output 0-20-40-60-80-100% of the output. If the analog outputs
are set for 0-5 V full scale the outputs would step 0-1-2-3-4-5 VDC. The stepping can be halted
at any value by pressing the key under the percentage on the front panel. When the test is halted,
square brackets are placed around the percentage value in the display. Pressing the key again
resumes the test. This test is useful for testing the accuracy/linearity of the analog outputs.
10-17