Jittermeter--a microcomputer-based system for single fibre electromyography

In single fibre electromyography (SFEMG) an exact measurement and computation of a number of time parameters is required. This paper describes a low-cost microprocessor-based measurement system for SFEMG data acquisition, computation of the parameters and display, as an alternative to a general purpose-computer based system. Time measurement is performed at dual resolution: 0.1 microsecond and 0.1 msec. Erroneous data due to disturbing voltages are automatically eliminated. A variety of SFEMG applications is covered by 3 basic modes of data handling. The microprocessor unit is based on the 6800 family and contains 3K of program memory, input-output modules and 4K data memory. The instructions are entered through a keyboard and output is provided by an LED display, line-printer and X-Y storage display.