Section 8. Operation
For a complete treatment of current-loop sensors (4 to 20 mA, for example),
please consult the following publications available at www.campbellsci.com/app-
notes:
• Current Output Transducers Measured with Campbell Scientific
Dataloggers (2MI-B)
• CURS100 100 Ohm Current Shunt Terminal Input Module
8.1.2.7 Voltage Measurements — Details
Related Topics:
• Voltage Measurements — Specifications
• Voltage Measurements — Overview
(p. 65)
• Voltage Measurements — Details
(p. 345)
8.1.2.7.1 Voltage Measurement Limitations
Caution Sustained voltages in excess of ±8.6 V applied to terminals
configured for analog input can temporarily corrupt all analog
measurements.
Warning Sustained voltages in excess of ±16 V applied to terminals
configured for analog input will damage CR800 circuitry.
Voltage Ranges
Related Topics:
• Voltage Measurements — Specifications
• Voltage Measurements — Overview
(p. 65)
• Voltage Measurements — Details
(p. 345)
In general, use the smallest fixed-input range that accommodates the full-scale
output of the sensor. This results in the best measurement accuracy and resolution.
The CR6 has fixed input ranges for voltage measurements and an auto-range to
automatically determine the appropriate input voltage range for a given
measurement. The table Analog Voltage Input Ranges and Options
(p. 346) lists
these input ranges and codes.
An approximate 9% range overhead exists on fixed input voltage ranges. In
other words, over-range on the ±2500 mV input range occurs at approximately
2725 mV and –2725 mV. The CR800 indicates a measurement over-range by
returning a NAN (not a number) for the measurement.
Automatic Range Finding
For signals that do not fluctuate too rapidly, range argument AutoRange allows
the CR800 to automatically choose the voltage range. AutoRange makes two
To Next Page
Loading...
Need help?
General
