Teledyne T100, Instruction Manual, Page: 277 / 404

Teledyne ML - T100 UV Fluorescence SO2 Analyzer Troubleshooting & Repair
06807A(DCNxxxx) 277
10.6.7.2. ANALOG OUTPUT VOLTAGES
To verify that the analog outputs are working properly, connect a voltmeter to the output
in question and perform an analog output step test as described in Section 4.8.3.
For each of the steps, taking into account any offset that may have been programmed into
the channel (refer to Section 4.8.4.4), the output should be within 1% of the nominal
value listed in the Table 11-7 except for the 0% step, which should be within 2-3 mV. If
one or more of the steps is outside of this range, a failure of one or both D/A converters
and their associated circuitry on the motherboard is likely.
Table 10-7: Analog Output Test Function - Nominal Values
FULL SCALE OUTPUT VOLTAGE
100MV 1V 5V
10V
*
STEP % NOMINAL OUTPUT VOLTAGE
1 0 0 mV 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
*
Increase the Analog Out (AOUT) Cal Limits in the DIAG>Analog I/O Config menu.
10.6.7.3. STATUS OUTPUTS
The procedure below can be used to test the Status outputs.
1.
Connect a cable jumper between the “-“ pin and the “

” pin on the status output
connector.
2.
Connect a 1000 Ω resistor between the +5 V and the pin for the status output that is
being tested.
Table 10-8: Status Outputs Check Pin Out
PIN
(left to right)
STATUS
1 System Ok
2 Conc Valid
3 High Range
4 Zero Cal
5 Span Cal
6 Diag Mode
7 Spare
8 Spare
Connect a voltmeter between
the “-“ pin and the pin of the output being tested (refer to Table 10-8).
Under the DIAG

SIGNAL I/O menu (refer to Section 4.8.2), scroll through the inputs and outputs until you get
to the output in question. Alternately turn on and off the output noting the voltage on the voltmeter, it should vary
between 0 volts for ON and 5 volts for OFF.