The variation of quantities and conditions in industrial process are classified into three types. If the cause of the variation is found in each case, however, it is necessary to improve the process itself first of all and then to consider the problem of its instrumentation and automation.
To analize the process, it is desired to carry out the continuous measurement of the process variables. In data hadling, which has become to use computer, it is necessary not only to reduce the computing period but also to have the periods necessary to take and compute the data well balanced each other. In accordance with such idea, the writers have constructed a system which can digitalize and encode the data and store it in the perforated tape immediately after it is measured. The system has the following features:
1) Self-balancing type indicating recorder of commercial make is used for variable detection.
2) Data sampling periods are variable from 0.5sec. to 12 minutes.
3) Whole system is portable and accordingly convenient for field use.

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The dynamic characteristics of an industrial process in the time domain are specified by the weighting function (impulse response) easily obtained from the step-function response. If an input signal of the process is quantized by a specified sampling period Δ, it will be replaced by a train of impulses. The response to the individual impulse has a similar waveform to the weighting function and its magnitude is proportional to the amplitude and the duration of the impulse. Therefore, if these wave forms can be convoluted, the response of the process will be produced. This new process simulator, which is capable of performing the convolution mechanically, has been accomplished by the combined use of digital and analog techniques. The transient response of process to be imitated is set in the simulator graphically. The simulator represents dynamic behaviors of various industrial processes which may have remarkable dead time. All data are quantized by a sampling period Δ, which is adjustable in a wide range through a programming mechanism, so that the simulator can behave in the real time. This has great advantages over the usual electronic analog computer and the high speed delay type process simulator in acquiring experimental data on an actual controller, especially a digital controller and for training a human operator.

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