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Campbell CR1000 User Manual

Campbell CR1000
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Section 5. System Overview
Table 2. Differential and Single-Ended Input
Terminals
DIFF Terminals SE Terminals
1H 1
1L 2
2H 3
2L 4
3H 5
3L 6
4H 7
4L 8
5H 9
5L 10
6H 11
6L 12
7H 13
7L 14
8H 15
8L 16
5.1.2.1.1 Single-Ended Measurements Overview
Related Topics:
Single-Ended Measurements Overview (p. 65)
Single-Ended Measurements Details
(p. 307)
A single-ended measurement measures the difference in voltage between the
terminal configured for single-ended input and the reference ground. The
measurement sequence is illustrated in figure Simplified Voltage Measurement
Sequence
(p. 306). While differential measurements are usually preferred, a single-
ended measurement is often adequate in applications wherein some types of noise
are not a problem and care is taken to avoid problems caused by ground currents.
Examples of applications wherein a single-ended measurement may be preferred
include:
Not enough differential terminals available. Differential measurements use
twice as many H/L] terminals as do single-ended measurements.
Rapid sampling is required. Single-ended measurement time is about half
that of differential measurement time.
Sensor is not designed for differential measurements. Many Campbell
Scientific sensors are not designed for differential measurement, but the draw
backs of a single-ended measurement are usually mitigated by large
programmed excitation and/or sensor output voltages.
65

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Campbell CR1000 Specifications

General IconGeneral
Power Requirements9.6 to 16 VDC
Data Logger Operating SystemCRBasic
Memory4 MB
Analog Inputs16 single-ended or 8 differential
Analog Input Resolution13 bits
Analog Input Range+/-2.5V
Digital I/O8
Pulse Counters2
Communication PortsRS-232
Operating Temperature-25°C to +50°C
Pulse Channels4

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