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Campbell CR1000 User Manual

Campbell CR1000
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Section 5. System Overview
5.1.3.3 Pulse Sensor Wiring
Read More See the section Pulse Measurement Tips (p. 356)
An example of a pulse sensor connection is illustrated in figure Pulse-Input
Wiring Example Anemometer Switch
(p. 70). Pulse sensors have two active
wires, one of which is ground. Connect the ground wire to a
(signal ground)
terminal. Connect the other wire to a P terminal. Sometimes the sensor will
require power from the CR1000, so there may be two power wires one of
which will be power ground. Connect power ground to a G terminal. Do not
confuse the pulse wire with the positive-power wire, or damage to the sensor or
CR1000 may result. Some switch-closure sensors may require a pull-up resistor.
Figure 24. Pulse-Input Wiring Example Anemometer
5.1.4 Period Averaging Overview
Related Topics:
• Period Averaging Specifications
Period Averaging Overview
(p. 70)
Period Averaging Details
(p. 360)
The CR1000 can measure the period of an analog signal.
Numbered SE terminals are configurable for period average:
Voltage gain: 1, 10, 33, 100
Maximum frequency: 200 kHz
Resolution: 136 ns
Note Both pulse-count and period-average measurements are used to measure
frequency output sensors. Yet pulse-count and period-average measurement
methods are different. Pulse-count measurements use dedicated hardware pulse
count accumulators, which are always monitoring the input signal, even when the
CR1000 is between program scans. In contrast, period-average measurement
instructions only monitor the input signal during a program scan. Consequently,
pulse-count scans can usually be much less frequent than period-average scans.
Pulse counters may be more susceptible to low-frequency noise because they are
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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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