Section 5. System Overview
5.3.2.3 Grounding Terminals
Read More See Grounding (p. 105).
Proper grounding lends stability and protection to a data acquisition system. It is
the easiest and least expensive insurance against data loss — and often the most
neglected. The following terminals are provided for connection of sensor and
CR1000 datalogger grounds:
• Signal Ground (
) — reference for single-ended analog inputs, pulse inputs,
excitation returns, and as a ground for sensor shield wires. Signal returns for
pulse inputs should use
terminals located next to the pulse input terminal.
Current loop sensors, however, should be grounded to power ground.
• Power Ground (G) — return for 5V, SW12, 12V, current loop sensors, and C
configured for control. Use of G grounds for these outputs minimizes
potentially large current flow through the analog-voltage-measurement
section of the wiring panel, which can cause single-ended voltage
measurement errors.
•
• Earth Ground Lug (
) — connection point for a heavy-gage earth-ground
wire. A good earth connection is necessary to secure the ground potential of
the CR1000 and shunt transients away from electronics. Minimum 14 AWG
wire is recommended.
5.3.2.4 Power Terminals
Related Topics:
• Power Supplies — Specifications
• Power Supplies — Quickstart
(p. 44)
• Power Supplies — Overview (p. 85)
• Power Supplies — Details (p. 100)
• Power Supplies — Products (p. 657)
• Power Sources (p. 101)
• Troubleshooting — Power Supplies (p. 494)
5.3.2.4.1 Power In
The POWER IN connector is the connection point for external power supply
components.
5.3.2.4.2 Power Out Terminals
Note Refer to the section Switched Voltage Output — Details (p. 103) for more
information on using the CR1000 as a power supply for sensors and peripheral
devices.
The CR1000 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 CR1000 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
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