Section 5. Overview
63
The CR3000 has several terminals designed to supply switched voltage and
current to peripherals, sensors, or control devices:
•
Voltage Excitation (switched-analog output) — Vx terminals supply
precise voltage. These terminals are regularly used with resistive-bridge
measurements..
•
Digital I/O — C terminals configured for on / off and PWM (pulse width
modulation) or PDM (pulse duration modulation) on C4, C5 and C7.
•
Switched 12 Vdc — SW12 terminals. Primary battery voltage under
program control to control external devices (such as humidity sensors)
requiring nominal 12 Vdc. SW12 terminals can source up to 900 mA.
See the table Current Source and Sink Limits
(p. 424).
•
Continuous Analog Output (CAO) — two CAO terminals (CAO1 and
CAO2) capable of driving voltages from –5000 mV to 5000 mV at ±15
mA. The number of CAO terminals can be expanded with peripheral
CAO devices available from Campbell Scientific. Refer to the appendix
Continuous-Analog Output (CAO) Modules — List
(p. 607)
for more
information.
•
Switched Current Excitation — three switched current excitation
terminals (IX1, IX2, IX3) with return to IXR terminal. These terminals
are regularly used with resistive-bridge measurements.
5.1.1.3 Power Terminals
5.1.1.3.1 Power In Terminals
The POWER IN connector is the connection point for external power supply
components.
5.1.1.3.2 Power Out Terminals
Note Refer to Switched-Voltage Output — Details
(p. 424)
for more
information about using the CR3000 as a power supply for sensors and
peripheral devices.
The CR3000 can be used as a power source for sensors and peripherals. The
following voltages are available:
•
12V terminals: unregulated nominal 12 Vdc. This supply closely tracks
the primary CR3000 supply voltage, so it may rise above or drop below
the power requirement of the sensor or peripheral. Precautions should
be taken to prevent damage to sensors or peripherals from over- or
under-voltage conditions, and to minimize the error associated with the
measurement of underpowered sensors. See Power Supplies —
Overview
Summary of Contents for CR3000 Micrologger
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