Dynamic strain is a strain which varies with time. By measuring the dynamic strain caused by vibration, the dynamic behavior of a structure can be numerized and graphed in wave form. The analog signal is amplified, output and recorded to an external recorder. Till now many analog type dynamic strainmetes which basically need one strainmeter and one recorder for each channel have been used, but nowadays when data processing with a computer has become a must, digital type dynamic strainmeters which digitize analog signal (input signal) at high speed, once store in the internal data memory and transfer to a computer have gone mainstream. The digital dynamic strainmeters enabling 4, 8, 10 and 50 channel measurements with one unit are now available. Also, there are dynamic recorders with recording function which display numeric data and wave data and store them and dynamic strainmeters which perform on-line setup and data processing.

The dynamic strainmeters are available with AC carrier or DC in bridge excitation. As the sensitivity is the magnitude of output to input strain, the higher the bridge excitation, the higher the sensitivity becomes. On the other hand,as the bridge voltage reflects the magnitue of Joule's heat and influences the temperature characteristics of sensors, there are instruments which can select bridge excitation depending on sensors.

Carrier type:High S/N ratio and excellent stability
DC type:High frequency response and excellent linearity

Number of channels, frequency response and bridge excitation

Interface and other features