Extend your measurement channels
Multiplexers allow our dataloggers to measure more sensors. The number
of analog inputs is increased by sequentially multiplexing sensor leads
into "common" leads. The individual common...
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Provide power to external devices
Relays are devices that can provide power directly to external devices that have modest power requirements, such as the small fans used in our Bowen ratio systems. Alternatively, these relay drivers can...
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Expand your output and measurement capabilities
The SDMs are a group of addressable peripherals that expand the CR1000, CR3000, CR5000, and CR9000X output and measurement capabilities. The data logger controls the SDM output device by storing a value...
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Integrate frequency sensors
These interfaces allow our data loggers to read vibrating wire sensors. Vibrating wire (or vibrating strip) transducers are commonly used to measure strain, load, pressure, and water level. These sensors...
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About Measurement & Control Peripherals
This family of peripherals expands the already formidable measurement and control capabilities of Campbell data loggers.
Measurement peripherals are situated between the data logger and its sensors, while control peripherals are situated between the data logger and external device(s) under data logger control. Examples of measurement peripherals include vibrating wire interfaces, serial data interfaces, terminal input modules, and in most cases, multiplexers. Examples of control peripherals include relay drivers, some SDM peripherals, and occasionally, multiplexers. Some SDM devices can perform both measurement and control functions simultaneously.
As a group, these peripherals range from quite simple --- in the case of the precision resistor networks in our voltage dividers, to quite sophisticated --- in the case of SDM devices that have their own microprocessors and can perform measurement, control, and data processing functions independently of the connected data logger.
In many cases, these devices increase the channel capacity of the data loggers by allowing more sensors to be measured or more external devices to be controlled than is possible with the data logger alone. Our AM16/32 multiplexer enables one differential analog input to measure up to 32 sensors.
In some instances, the capabilities of the peripheral can provide additional capabilities to those available in the data logger. For example, the SDM-AO4 can provide continuous analog output capability that is unavailable in the CR10X.