Omega Vehicle Security 450 - Manual (Page 25)

22
Calibration- Thermistor Type
Equipment List
•
4 ½ digit voltmeter
•
Precision decade box:
Resolution, 0.01 ohm ; accuracy
±
0.02%
•
Ice Bath, 0.00
°
C
±
0.05
°
C
•
Electro Scientific Industries DB-62 or
equivalent
a. Turn the indicator ON by pressing the
°
C key.
b. Remove the bottom case of the indicator.
c. Connect a precision resistance box to the
terminals on the phone input jack; set the
resistance box to 7,280 ohms.
d. Connect the DVM LO lead to “GND”, on the
indicator printed circuit board.
e. Using HI lead of DVM, measure voltage