Teledyne 9110T instruction manual Status Outputs, To test the status output electronics, Ozoneflow

Model 9110T NOx Analyzer Troubleshooting & Service

1.Use the Signal I/O function (see Section 12.1.3 and Appendix A) to view the value of REF_4096_MV and REF_GND.

∙If both are within 3 mV of nominal (4096 and 0), and are stable, ±0.2 mV then the basic A/D is functioning properly. If not then the motherboard is bad.

2.Choose a parameter in the Signal I/O function list (see Section 12.1.3) such as

OZONE_FLOW .

∙Compare this voltages at its origin (see the interconnect drawing and interconnect list in Appendix D) with the voltage displayed through the signal I/O function.

∙If the wiring is intact but there is a large difference between the measured and displayed voltage (±10 mV) then the motherboard is bad.

12.7.6.3.Status Outputs

	V
+DC	Gnd

Figure 12-5: Typical Set Up of Status Output Test

To test the status output electronics:

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.

4.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.

Teledyne Analytical Instruments 287