Methods of producing equipment for automatic testing of indicating electrical measuring instruments
Dynamic testing methods are very promising in designing automatic test equipment, and they provide higher operating speeds and simpler equipment as compared with static methods.
In developing equipment for automated dynamic testing of indicating instruments it is necessary to bear in mind the considerable dynamic error incurred in the actual testing time and to provide special measures in order to account for and eliminate this error. In particular it is possible to use a method of feeding the tested instrument with an input signal which does not vary linearly (see Fig. 5), but according to a stepped law with an increased speed of the pointer between the tested scale marks, and the speed in the area of the marks reduced to permissible values of the dynamic error.
The most promising trend in developing automatic testing equipment consists of the dynamic method which provides high speed and precision for simple and reliable circuit designs. Moreover, the greatest attention should be paid to designing equipment which registers the coincidence of the pointer with the tested mark by means of continuous tracking of the mark and automatic evaluation of the error by a reference comparison instrument with a digital display.
This method together with special measures for eliminating the inherent dynamic testing error can serve to develop an efficient equipment for objective dynamic testing which will have as small an error as in static testing, but will be superior to it in simplicity, reliability, and efficiency.
KeywordsSpecial Measure Dynamic Testing Dynamic Error Automatic Testing Automatic Evaluation
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- 1.Z. A. Zharzhevskii and S. G. Rabinovich, Vestnik élektropromyshlennosti, No. 2 (1958).Google Scholar
- 2.Machine a'tracer les traits de la graduation d'un appareil de mesure (Albert Le Boeut et Fils). French pat. cl. 601 B, No. 1339602.Google Scholar
- 3.E. N. Verbenko, Efficient method for testing reference ammeters and wattmeters. Research in the field of electrical and magnetic measurements, Transactions of the Committee's Institutes, No. 82/142 (1965).Google Scholar
- 4.S. G. Rabinovich and B. A. Seliber, Authors' Certificate No. 105873, Byul. izobr., No. 4 (1957).Google Scholar
- 5.N. V. Pirozhkov, V. A. Razumovskii, and R. I. Shneider, Semiautomatic equipment for testing and calibrating dc electrical measuring instruments, Authors' Certificate No. 154946, Byul. izobr., No. 11 (1963).Google Scholar
- 6.T. L. Rollins and T. D. Martin, APS-assured performance calibration, ISA Journal, No. 11, 12 (1965).Google Scholar
- 7.Electrical Measuring Instruments, GOST 1845-52.Google Scholar
- 8.Committee of Standards' Instruction No. 184-63 on Testing Electrical Measuring Instruments.Google Scholar
- 9.M. L. Brzhezinskii, D. I. Zorin, and V. D. Sverdlichenko, Photometric photoelectric microscope. Research in the field of linear measurements, Transactions of the Committee's Institutes, No. 78 (138) (1965).Google Scholar
- 10.S. P. Éskin, Device for testing electrical measuring instruments, Author's Certificate No. 194948, Byul. izobr., No. 9 (1967).Google Scholar
- 11.S. P. Éskin, Inherent error in dynamic testing of instruments with direct evaluation, Transactions of the Metrological Institutes, Izd. standartov, No. 97 (157), Moscow-Leningrad (1967).Google Scholar