Use of a Time-shared Computer System to Control a Hall Effect Experiment, Volume 13An experimental time-shared computer system has been used to control and collect data from a Hall effect experiment. In addition to selection of the voltage sequence and control of specimen current and magnetic flux directions, the computer exerts positive control over the specimen temperature in accordance with a series of thermocouple voltages entered by the operator at the beginning of the run. The interface circuitry is constructed from four general purpose modules and a single special purpose unit. Details of the interface system and the programs used to control the experiment and to perform intermediate calculations are given. It was found that the time-shared system was well-suited to control an experiment of this type. The demands on the computer were essentially similar to those required by a human user interacting in a conversational mode. Substantial savings in time over manual data collection and reduction were realized; a temperature run with 38 to 40 data points between 10 and 320 K could be completed in less than 4 hours. |
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CALCUR(V channel charge carrier checked circuit COMMAND DECODER computer-controlled configuration connected control character control module core memory data input sequence DATA SAVE designed desired thermocouple voltage Dewar flask digital voltmeter digital-to-analog converter electric experimental FIELD WAIT Figure flip-flop FUNCTION OF COOLANT Hall coefficient Hall effect experiment Hall mobility Hall voltage hardware interface helium indium antimonide initiate liquid load magnetic field magnetic flux density magnetic tape manual maximum thermocouple voltage mode MODULE PROGRAM n-type on-line operation plugboard printed purpose modules READ DATA Read Temperature reed relay scanner resistivity voltage response reversed scan cycle serial small computer special interface module specimen arms specimen current specimen holder standard resistor step stop point storage STORE DATA SET SUBROUTINE switch Technical Technology tele TELETYPE teletypewriter interface module temperature control temperature range time-shared computer system time-shared system transmission transmitted usually values