Teledyne GFC-7000E - Trace CO2 Analyzer - Manual (Page 216)

Model GFC7000E Instruction Manual TROUBLESHOOTING & REPAIR PROCEDURES
04584 Rev A1 205
described in Section 6.9.4.2 and then perform an Analog Output Step Test as described in Section
6.9.3.
For each step the output should be within 1% of the nominal value listed in the table below.
Table 11-11: Analog Output Test Function - Nominal Values Current 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
11.4.7.4. Status Outputs
The procedure below can be used to test the Status outputs:
Connect a jumper between the “D“ pin and the “V” pin on the status output connector.
Connect a 1000 ohm resistor between the “+” pin and the pin for the status output that is being
tested.
Connect a voltmeter between the “V” pin and the pin of the output being tested (see table
below).
Under the DIAGÆ SIGNAL I/O menu (see Section 11.1.3), 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 11-12: 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 ALRM1
8 SALRM2
11.4.7.5. Control Inputs – Remote Zero, Span
The control input bits can be tested by the following procedure: