Campbell Scientific CR6 CR6 Measurement and Control System - Page 57
Time Keeping - Overview, Analog Measurements - Overview
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Section 5. System Overview • Sensors - Lists (p. 599) 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 (http://www.campbellsci.com/manuals). You can also consult with a Campbell Scientific application engineer. 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. 73), are configurable for the measurements discussed in the following sections: 5.1.1 Time Keeping - Overview Reading List: • Time Keeping - Overview (p. 72) • Time Keeping - Details (p. 305) 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. 5.1.2 Analog Measurements - Overview Reading List: • Analog Measurements - Overview (p. 57) • Analog Measurements - Details (p. 307) Analog sensors output a continuous voltage or current signal that varies with the phenomena measured. Sensors compatible with the CR6 output a voltage. Current output can be made compatible with a resistive shunt. Sensor connection is to U terminals configurable for differential or single-ended inputs. For example, differential channel U1 is comprised of terminals U1 and U2, with U1 as high and U2 as low. 5.1.2.1 Voltage Measurements - Overview Reading Lists: • Voltage Measurements - Specifications (p. 91) • Voltage Measurements - Overview (p. 57) • Voltage Measurements - Details (p. 307) • Maximum input voltage range: ±5000 mV • Measurement resolution range: 0.05 µV to 30 µV RMS Single-ended and differential connections are illustrated in the figures Analog Sensor Wired to Single-Ended Channel #1 (p. 58) and Analog Sensor Wired to Differential Channel #1 (p. 59). Table CR6 Terminal Definitions (p. 73) lists the available analog input configurations. 57
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