Single-circuit measurement display instrument

The utility model relates to a single-circuit measuring displaying instrument, which relates to an industrial automatic instrument, which is characterized in that the instrument comprises a signal input end, an analog signal switch, an A/D converter, a CPU processor, a memory and a LED display, wherein, the program memory is provided with different intending-execution program order controlling and the calculation method of different physical quantities, the CPU processor opens the corresponding analog signal channel through the command analog signal switch, at the same time, the calculation method of the corresponding analog signal and the running program are called from the program memory to perform the calculation processing, and the calculation result is displayed on the LED display so as to realize the measuring, displaying and controlling of different analog signals.