CDMs Campbell Distributed Modules

Measurement & Control Peripherals / CDMs

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About CDMs

Campbell Distributed Modules (CDMs) are the measurement devices that scale the channel count beyond what is found in the standard dataloggers, add functionality to a datalogger that it does not normally have (such as higher measurement precision or vibrating-wire capability), and improve measurement quality by moving the point of measurement closer to the sensors, while still allowing the network of modules to behave as a single datalogger.

CDMs all follow a standardized compact form factor.

Retired Products
FAQs

Product Line

CDM Accessories

Retired Products

CDM-VW300 Dynamic Vibrating-Wire Analyser (2-channel)

CDM-VW305 8-Channel Dynamic Vibrating-Wire Analyzer

CDM-A116 16-Channel 5 V Analog Input Module

Related FAQs

Number of FAQs related to CDMs: 3

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What do the CDM-VW300-series analyzers do?

The CDM-VW300 and CDM-VW305 are hardware modules that are used within a data acquisition system to obtain high-speed (less than a second) readings from multiple classes of mainstream vibrating-wire sensors.

These CDMs operate as an interface between one or more vibrating-wire sensors and a Campbell Scientific datalogger. To obtain accurate measurements from the sensors, the CDM-VW300 and CDM-VW305 perform sophisticated sensor excitation, spectral analysis, and other digital signal processing (DSP) techniques. The data is transferred to, and stored on, the datalogger, where it can be retrieved and analyzed using a personal computer.
Do CDMs have optical isolation?

CDMs do not have optical isolation on the communication ports.
What can the CPI bus tolerate?

The CPI bus is CE tested to Class 4. This covers surge, ESD, RF emissions and susceptibility, and capacitively coupled fast transients. The CPI bus tolerates DC ground potential differences between devices of up to 7 V.

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