Omega Vehicle Security DRA-RTM-8 manual True High Setting, Calibration Procedure

9.4.2 "TRUE HIGH" SETTING

ADDRESS BUS				E/T	OUTPUT
A3	A2	A1	A0		CHANNEL
0	0	0	0	1	1
0	0	0	1	1	2
0	0	1	0	1	3
0	0	1	1	1	4
0	1	0	0	1	5
0	1	0	1	1	6
0	1	1	0	1	7
0	1	1	1	1	8
x	x	x	x	0	TEST MODE

	ADDRESS BUS				E/T	OUTPUT
	A3	A2	A1	A0		CHANNEL
1		0	0	0	1	9
1		0	0	1	1	10
1		0	1	0	1	11
1		0	1	1	1	12
1		1	0	0	1	13
1		1	0	1	1	14
	1	1	1	0	1	15
	1	1	1	1	1	16
	x	x	x	x	0	TEST MODE

Note: The unit includes three internal potentiometers. These potentiometers are carefully adjusted and sealed in the factory. It is not recommended to alter these calibration potentiometers.

10. CALIBRATION

To calibrate the DRA-RTM-8, the limits must be defined. Tmin is the temperature at which the output current is 4mA. Tmax is the temperature at which the output current is 20mA. Tspan is the difference between Tmax and Tmin.

10.1CALIBRATION PROCEDURE

a.Remove the terminal strips to get access to the coarse calibration switches.

b.Set the channels DIP switches to the desired calibration ranges according to the calibration tables.

c.Re-install the terminals strips. The terminal strips are polarized and should be returned to their original position.

d.Connect a Pt-100 calibrator* set for Tmin to the proper input terminals.

e.Apply the proper channel selection code by connecting those which according the table should be "1" to the +PWR terminal.

f.Start calibrating by adjusting the proper "Z" potentiometer to obtain an output current of 4.000mA.

g.Set the calibrator for Tmax and adjust the "S" potentiometer to obtain an output current of 20.000mA.

h.Repeat this procedure until satisfactory results are obtained.

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