Teledyne 100AH instruction manual 10-7, Drk Lmp

Teledyne API Model 100AH SO2 Analyzer Instruction Manual, 02417, Rev. D

Table 10-1: Test Functions (Continued)

Test Function	Factory Set-Up	Comment
DRK LMP	-50 ± 200 mV	This is the reading of the UV reference detector without the
		UV lamp. When the is momentarily turned off, UV detector
		signal is the dark current of the detector itself. The dark
		current is monitored and compensated for any UV detector
		dark current drift or offset.
		High dark UV detector could be caused by:
		1.	Lamp not turning off completely.
		2.	High electronic offset.
SLOPE	1.0 ± 0.2	The slope can be thought as a gain term which determines the
		steepness of the calibration curve.
		M100AH will operate normally even the slope is out of range,
		however it is preferred within the range for optimum
		operation of the analyzer.
		Slope out of range could be due to:
		1.	Analog gain pot needs adjustment (see Section 10.1.6).
		2.	Poor calibration quality (see Section 8.7).
OFFSET	<50 mV	This is essentially identical to the stray light except it is
		expressed in mV.
		High offset could be due to:
		1.	Light leak.
		2.	Aging UV filter.
		3.	Contaminated reaction cell.
		4.	Pneumatic leak.
		5.	Poor calibration quality.
HVPS	400 - 900 V	This represents the scaled-up HVPS programming voltage to
		the HVPS. The design of the HVPS precludes taking a single
		reading that indicates the health of the supply. Refer to the
		HVPS Troubleshooting Section 10.3.9 for a procedure for
		testing the HVPS. This TEST function is used primarily to set
		the HVPS voltage value and the reading should be very stable
		and constant. A value not in the 400 to 900 volt range
		indicates problems with the HVPS supply.

(table continued)

10-7