Campbell CR1000 User Manual

Section 7. Installation
Note Lightning strikes may damage or destroy the CR1000 and associated
sensors and power supplies.
In addition to protections discussed in , use of a simple lightning rod and low-
resistance path to earth ground is adequate protection in many installations. .
Figure 34. Lightning-Protection Scheme
7.6.2 Single-Ended Measurement Reference
Low-level, single-ended voltage measurements (<200 mV) are sensitive to ground
potential fluctuation due to changing return currents from 12V, SW12, 5V, and
C1 – C8 terminals. The CR1000 grounding scheme is designed to minimize these
108

Campbell CR1000 Specifications

General

Power Requirements	9.6 to 16 VDC
Data Logger Operating System	CRBasic
Memory	4 MB
Analog Inputs	16 single-ended or 8 differential
Analog Input Resolution	13 bits
Analog Input Range	+/-2.5V
Digital I/O	8
Pulse Counters	2
Communication Ports	RS-232
Operating Temperature	-25°C to +50°C
Pulse Channels	4