CR1000 Manual - Campbell Scientific

Section 4. Quickstart Tutorial
4.1.3.3.1 Pulses Measured
Figure Pulse Sensor Output Signal Types (p. 39) illustrates three pulse sensor output
signal types.
Figure 7: Pulse-sensor output signal types
4.1.3.3.2 Pulse-Input Channels
Table Pulse-Input Channels and Measurements (p. 39) lists devices, channels and
options for measuring pulse signals.
Table 2. Pulse-Input Channels and Measurements
Pulse-Input
Channel Input Type Data Option
CRBasic
Instruction
P1, P2
• High-frequency
• Low-level ac
• Switch-closure
• Counts
• Frequency
• Run average
of frequency
PulseCount()
• Counts
• High-frequency
• Frequency
C1, C2, C3, C4,
C5, C6, C7, C8
• Switch-closure
• Low-level ac
(with LLAC4
Low-Level AC
Conversion
Module)
• Running
average of
frequency
• Interval
• Period
PulseCount()
TimerIO()
• State
4.1.3.3.3 Pulse Sensor Wiring
Wiring a pulse sensor to a CR1000 is straight forward, as shown in figure Pulse-
Input Wiring -- Anemometer Switch (p. 40). Pulse sensors have two active wires,
one of which is always ground. Connect the ground wire to a (ground)
39