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 Posted: Wed 12:34, 08 Dec 2010 Post subject: ugg prezzo Calibration device detected by XFlb hig |
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Calibration device detected by XFlb high current part of the AC current source and measurement error of indication Uncertainty
Legislation, so from (3) can be combined standard uncertainty of the: \,)] (5) with the relevant parameters of one type (5), can be obtained: \. combined standard uncertainty \Uncertainty expanded to take 41 * confidence level P = 95%, Veff = 100, t distribution table for the search: Chi 95 = t95 ('1) eff) = t95 (100) = 1.98 expanded uncertainty U95 is: U95 = k95 \questions need attention. 1. current transformer secondary side connection with XFlb calibration device should guarantee a solid and reliable, so that not only can reduce exposure to error, and also avoid the current transformer secondary side open instantaneously, resulting in high pressure, endanger the safety of persons and equipment; 2. to ensure that the current flowing through the DC standard resistor value can not exceed its rating, if it is to use the maximum current, time not too long, so as to avoid damage to the DC standard resistor; 3. the current transformer the measurement accuracy by the size of the secondary load impedance greater impact, that is,[link widoczny dla zalogowanych], when the secondary load resistance increases, the current transformer measurement error will increase, and the current transformer secondary load impedance is generally relatively small , only a few tenths of a few ohms or ohms. So,[link widoczny dla zalogowanych], requiring current transformer secondary side impedance of the connection wires should be very small, often require the connection wire impedance and connected to the current transformer secondary side of the instrument's internal resistance should be less than the sum of the rated current transformer secondary load value; 4. For XFlb calibration device,[link widoczny dla zalogowanych], 7081-type digital voltmeter and AC current sources were seized during the operation should pay attention to the problem, see the manual, limited length of relationship, not repeat them here. VI, the conclusion of the test results through the measurement uncertainty analysis, we can see the method described in this paper is detected at the 0.05 level of accuracy for ac current source large current part of the indication error is feasible. References [1] Shanghai Electric Meter Works. XFlb AC and DC precision meter calibration manual. Shanghai Electric Meter Works, 1982. [2] National Quality and Technical Supervision. Measurement Uncertainty Evaluation and Expression of JJ with 059-1999. China Metrology Publishing House, 1999. [3] Shanghai Instrument Research Institute. YS87B high-power programmable multi standard source. Shanghai Instrument Research Institute, 1998. oscilloscope automatic calibration and management System Xue Yushan (Shenyang University of Technology, Liaoning Liaoyang 111003) Abstract This paper introduces the 9500 Oscilloscope Calibrator (Fluke)-based automatic calibration standard oscilloscope and management systems, applications, the system can achieve an IEEE 488 interface with an oscilloscope automatic verification and non-IEEE 488 interface, a semi-automatic test oscilloscope. The high degree of automation systems, to avoid the human operator error on the test result, the measurement is more reliable and accurate test. Keywords oscilloscope oscilloscope automatic calibration management system is a species most widely used electronic devices, widely used in aviation, aerospace, missiles, radar and other fields. new digital oscilloscope,[link widoczny dla zalogowanych], and catching up in performance over the traditional analog oscilloscope, oscilloscope test should adapt to the development requirements with high accuracy, the program is simple and easy to operate,[link widoczny dla zalogowanych], high degree of automation of the measurement standard equipment. To this end, we produced 9500 U.S. high-performance oscilloscope calibrator is standard equipment, developed a set of automatic calibration and management system scope. I. 9500 oscilloscope overall design and management of automatic calibration system consists of 9500 oscilloscope calibrator, 1992 nanosecond counter, computer, printer, GPIB interface card form. The system block diagram shown in Figure 1. 9500 oscilloscope calibrator can generate precise sine signal square-wave signal, fast edge signal, DC voltage signal and the time-scale signal. You can test the calibration signal frequency outside the scope than the argument. 1992 nanosecond counter can test the calibration of the oscilloscope signal frequency. works as follows: by the computer through the GPIB Interface issue of program-controlled salt pad!!
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