The CDM-VW305 is an eight-channel interface that you can use between standard single-coil circuit vibrating-wire sensors and data loggers to allow shorter intervals between measurements. With the CDM-VW305 interface, you can achieve much faster and better measurements without having to purchase new sensors. Sensors typically used with the CDM-VW305 are strain gages, load cells, pressure transducers, crackmeters, and tiltmeters. This interface uses an excitation mechanism that maintains the vibrating-wire sensor in a continuously vibrating state. The interface measures the resonant frequency of the wire between excitations using the patented vibrating-wire spectral-analysis technolgy (VSPECT™). VSPECT provides very fine measurement resolution and also limits the influence of external noise by discriminating between signal and noise based on frequency content. Because of this technology, the signal can be carried through longer cables, giving you flexibility in your sensor and data logger siting. You can connect multiple CDM-VW305 modules to one data logger. The CDM-VW300 is similar to this item, but has two channels. The dynamic vibrating-wire measurement technique is protected under U.S. Patent No. 8,671,758, and the vibrating-wire spectral-analysis technology (VSPECT™) is protected under U.S. Patent No. 7,779,690.