Teledyne 9110T instruction manual 12.7.6.2. A/D Functions, Full Scale Output of Voltage Range

Model 9110T NOx Analyzer						Troubleshooting & Service
	Table 12-9:	Analog Output Test Function - Nominal Values Voltage Outputs
			FULL SCALE OUTPUT OF VOLTAGE RANGE
					(see Section 5.9.3.1)
			100MV		1V		5V	10V*
	STEP	%		NOMINAL OUTPUT VOLTAGE
	1	0	0		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

*For 10V output, increase the Analog Output Calibration Limits (AOUT CAL LIM in the DIAG>Analog I/O Config menu) to 4% (offset limit) and 20% (slope limit).

For each of the steps the output should be within 1% of the nominal value listed except for the 0% step, which should be within 0mV ±2 to 3 mV. Ensure you take into account any offset that may have been programmed into channel (See Section 5.9.3.9).

If one or more of the steps fails to be within these ranges, it is likely that there has been a failure of the either or both of the Digital-to-Analog Converters (DACs) and their associated circuitry on the motherboard. To perform the test connect a voltmeter to the output in question and perform an analog output step test as follows:

SETUP X.X
CFG DAS RNGE PASS CLK	EXIT
SETUP X.X
COMM VARS	EXIT

Performs analog output step test 0% to 100%

·Pressing the “x%” button pauses the test. Brackets will appear around the value: EXAMPLE: [10%]

·Pressing the “[x%]” button resumes the

test.

	SETUP X.X
			EXIT
DIAG
PREV		ENTR EXIT
DIAG AOUT

DIAG AOUT

12.7.6.2. A/D Functions

The simplest method to check the operation of the A-to-D converter on the motherboard is to use the Signal I/O function under the DIAG menu to check the two A/D reference voltages and input signals that can be easily measured with a voltmeter.

Teledyne Analytical Instruments 286