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The MSR-3C is a self-contained low cost portable accelerometer data logger unit with a multi-channel, digital acceleration waveform recording system. Our portable acceleration data logger system is battery powered, designed for field applications requiring multi-channel, extended time, unattended acceleration monitoring and recording. The portable accelerometer MSR-3C is programmed for test via a standard serial interface (New: also via USB (serial port emulation) ) to a PC using either of two optional software packages. After field recording is complete data is transferred back to the host computer for processing and analysis. Each portable acceleration data logger unit is powered by three built-in, rechargeable battery packs. Our portable acceleration data logger's recording function is controlled by three microprocessor-based digital data acquisition systems. Each of the systems is devoted to data acquisition on one of the three separate, three input channel sets. Channel sets may be tied together for simultaneous triggered acquisition, or allowed to operate independently. During active recording acceleration signals on each channel are digitized to 10 bit resolution and stored in digital memory within the unit. The MSR-3C offers 1 megabyte of data storage capacity per 3 channel set with 3 megabyte total data memory (12MB Optional). The MSR-3C also offers three input channels for optional temperature and temperature/relative humidity probes. Temperature and relative humidity recording occurs independent of acceleration recording, at regular, user-programmable time intervals.