Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 278)

Troubleshooting and ServiceTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 278
12.5.8.3. ANALOG OUTPUTS: CURRENT LOOP
To verify that the analog outputs with the optional current mode output are working
properly, connect a 250 ohm resistor across the outputs and use a voltmeter to measure
the output as described in Section 5.9.3.6 and then perform an analog output step test as
described in Section 12.5.8.2.
For each step the output should be within 1% of the nominal value listed in the table
below.
Table 12-11: Analog Output Test Function - Nominal Values Voltage Outputs
OUTPUT RANGE
2 -20 4 -20
NOMINAL OUTPUT VALUES
STEP % CURRENT V(250 OHMS) CURRENT V(250 OHMS)
1 0 2 mA 0.5V 4 1
2 20 5.6 1.4 7.2 1.8
3 40 9.2 2.3 10.4 2.6
4 60 12.8 3.2 13.6 3.4
5 80 16.4 4.1 16.8 4.2
6 100 20 5 20 5
12.5.8.4. STATUS OUTPUTS
The procedure below can be used to test the Status outputs:
1. Connect a jumper between the “D“ pin and the “” pin on the status output
connector.
2. Connect a 1000 ohm resistor between the “+” pin and the pin for the status output
that is being tested.
3. Connect a voltmeter between the “” pin and the pin of the output being tested (see
table below).
Under the DIAG SIGNAL I/O menu (see Section 12.1.3), 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.
Table 12-12: Status Outputs Check
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