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T400 Ozone Analyzer Operator’s Manual Troubleshooting & Service
263
12.7.8. MOTHERBOARD
12.7.8.1. Test Channel / Analog Outputs Voltage
The ANALOG OUTPUT submenu, located under the SETUP MORE DIAG
menu is used to verify that the T400 analyzer’s three analog outputs are working
properly. The test generates a signal on all three outputs simultaneously as shown in the
following table:
For each of the steps the output should be within 1% of the nominal value listed in the
table below except for the 0% step, which should be within 0mV ±2 to 3 mV. Make
sure you take into account any offset that may have been programmed into channel (See
Section 5.10.1.8).
Table 12-9: Analog Output Test Function - Nominal Values Voltage Outputs
FULL SCALE OUTPUT OF VOLTAGE RANGE
(see Section 5.10.1.6)
100MV 1V 5V 10V
STEP % NOMINAL OUTPUT VOLTAGE
1 0 0 0 0 0
2 20 20 mV 0.2 1 2
3 40 40 mV 0.4 2 4
4 60 60 mV 0.6 3 6
5 80 80 mV 0.8 4 8
6 100 100 mV 1.0 5 10
If one or more of the steps fails to be within these ranges, it is likely that there has been
a failure of the either or both of the DACs and their associated circuitry on the
motherboard. To perform the test connect a voltmeter to the output in question and
perform an analog output step test as follows:
DIAG SIGNAL I/O
PREV NEXT ENTR EXIT
DIAG AOUT ANALOG OUTPUT
[20%] EXIT
SETUP X.X ENTER PASSWORD
818 ENTREXIT
DIAG AOUT ANALOG OUTPUT
20% EXIT
Pressing the “n%” button pauses the
test. Brackets will appear around the
value: EXAMPLE: [20%]
Pressing the same button again will
resume the test.
Performs analog output step
test 0% to 100%
SETUP X.X SECONDARY SETUP MENU
COMM VARS DIAG EXIT
SETUP X.X PRIMARY SETUP MENU
CFG DAS RNGE PASS CLK MORE EXIT
SAMPLE RANGE=500.0 PPB O3= XXXX
<TST TST> CAL SETUP
06870C DCN6332