Campbell CR6 Series, Руководство оператора

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Section 5. Overview
71
•
G Power ground return for SW12 , 12V terminals, current loop sensors,
and U or 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.
• RG Resistive ground return for RS-485 connections.
• 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 CR6 and shunt transients away from electronics. Minimum 14
AWG wire is recommended.
5.2 Measurements — Overview
Related Topics:
• Sensors — Quickstart
(p. 39)
•
Measurements — Overview
(p. 71)
•
Measurements — Details
(p. 387)
• Sensors — Lists
(p. 657)
Most electronic sensors, whether or not they are supplied by Campbell Scientific,
can be connected directly to the CR6.
Manuals that discuss alternative input routes, such as external multiplexers,
peripheral measurement devices, or a wireless sensor network, can be found at
www.campbellsci.com/manuals .
This section discusses direct sensor-to-datalogger connections and applicable
CRBasic programming to instruct the CR6 how to make, process, and store the
measurements. Terminals on the CR6 wiring panel, as described in table CR6
Terminal Definitions
(p. 62),
are configurable for the measurements discussed in the
following sections:
5.2.1 Time Keeping — Overview
Related Topics:
•
Time Keeping — Overview
(p. 71)
• Time Keeping — Details
(p. 387)
Measurement of time is an essential function of the CR6. Time measurement with
the on-board clock enables the CR6 to attach time stamps to data, measure the
interval between events, and time the initiation of control functions.
5.2.2 Analog Measurements — Overview
Related Topics:
•
Analog Measurements — Overview
(p. 71)
•
Analog Measurements — Details
(p. 389)