Table 9-4: Diagnosticm - Teledyne 6400A Instruction Manual

Sulfur dioxide analyzer
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TAI Model 6400A SO
9.1.3.1 Signal I/O Diagnostic
Table 9-4: Diagnostic Mode - Signal I/O
No
Signal
0
DSP_BROWNOUT
1
EXT_ZERO_CAL
2
EXT_SPAN_CAL
3
SPAN_VALVE
4
CAL_VALVE
5
DARK_SHUTTER
6
RCELL_ HEATER
7
IZS_HEATER
8
ELEC_TEST
9
OPTIC_TEST
(table continued)
Analyzer Operator Manual, 02164, Rev. G
2
Control
Description
NO
Display brownout is used to keep the display from
getting corrupted during low line voltage conditions.
Circuitry on the Status/Temp board (01086A) senses
low line voltage and sets this bit. The CPU reads this
and generates the BROWNOUT_RST signal
described below.
NO
Shows state of status input bit to cause the 6400A to
enter Zero Calibration mode. Use to check external
contact closure circuitry.
NO
Shows state of status input bit to cause the 6400A to
enter the Span Calibration mode. Use to check
external contact closure circuitry.
YES
Switches the IZS Zero/Span valve. Use this bit to test
the valve function.
YES
Switches the IZS Sample/Cal valve. Use this bit to
test the valve function.
YES
Energizes the shutter. Use this bit to test the shutter
function which will block mechanically the UV lamp
light source.
NO
Shows the status of the reaction cell heater. This has
the same function as the LED in the power supply
module.
NO
Shows the status of the IZS permeation tube heater.
This has the same function as the LED in the power
supply module.
YES
Turns on electric test bit in preamp. Should be used
for troubleshooting preamp circuit. We recommend
you use the ELEC TEST button in the DIAG menu to
operate electric test.
YES
Turns on optic test bit in preamp. Should be used for
isolating PMT detector system from the rest of the
preamp circuit. We recommend you use the OPTIC
TEST button in the DIAG menu to operate optic test.
9-13

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