Specifications

Section 1. Installation and Maintenance
1-2
1.2 Power Requirements
The CR3000 operates at a nominal 12 VDC. Below 10 V or above 16 volts the
CR3000 does not operate properly.
The CR3000 is diode protected against accidental reversal of the positive and
ground leads from the battery. Input voltages in excess of 18 V may damage
the CR3000 and/or power supply. A transzorb provides transient protection by
limiting voltage at approximately 20 V.
System operating time for the batteries can be determined by dividing the battery
capacity (amp-hours) by the average system current drain. The CR3000
typically draws 2 mA in the sleep state (with display off), 3 mA with a 1 Hz
sample rate, 10 mA with a 100 Hz sample rate, and 38 mA with a 100 Hz sample
rate and RS232 communications.
The 12 V and switched 12 V terminals on the wiring panel
are not regulated by the CR3000; they obtain power
directly from the internal battery or Power In terminal. If
you use the CR3000 wiring panel to source power to other
12 V devices, be sure the power supply regulates the
voltage within the range acceptable to the connected
device. The maximum voltage output by a Campbell
Scientific power supply is approximately 16 V (the charging
voltage at –40°C).
CAUTION