Specifications

Section 6. CR1000 Power Supply

6-2

(ground). The CR1000 is internally protected against, but will not function

with, reversed external power polarity.

6.5 Vehicle Power Connections

If a CR1000 is powered by a motor vehicle supply, a second supply may be

needed. When starting the motor of the vehicle, the battery voltage may drop

below 9.6 V. This causes the CR1000 to stop measurements until the voltage

again equals or exceeds 9.6 V. A second supply can be provided to prevent

measurement lapses during vehicle starting. FIGURE 6.5-1 illustrate how a

secon

d power supply should be connected to the CR1000. The diode OR

connection causes the supply with the largest voltage to power the CR1000 and

prevents the second backup supply from attempting to power the vehicle.

CR1000

Panel

+12V

FIGURE 6.5-1. Connecting CR1000 to Vehicle Power Supply