Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 256)

Model 9110TH NOx Analyzer Troubleshooting & Repair
Teledyne Analytical Instruments 236
7.5.10.3. Status Outputs
The procedure below can be used to test the Status outputs.
V
+DC Gnd
Figure 7-15: Typical Set Up of Status Output Test
1. Connect a cable between the “D“ pin and the “” pin on the status output
connector.
2. Connect a 1000 Ω resistor between the “+” pin and the pin for the status output that
is being tested.
3. Connect a voltmeter between the “D“ pin and the pin of the output being tested
(Table 7-10).
4. Under the DIAG / SIGNAL I/O menu (Section 4.13.2), scroll through the inputs and
outputs until you get to the output in question. Alternately turn the output on and off.
 The Voltmeter will read approximately 5 VDC when the output is OFF.
 The Voltmeter will read approximately 0 VDC when the output is ON.
Table 7-10: Status Outputs Pin Assignments
PIN # STATUS
1 SYSTEM OK
2 CONC VALID
3 HIGH RANGE
4 ZERO CAL
5 SPAN CAL
6 DIAG MODE
7 LOW
8 SPARE