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If the sensor is mainly the insulation strength, the sensor output mV signal vulnerable to external interference from electrical noise signals. Example: A coal mine has a 80t truck scale analog sensors (8142Pro-type instrument) appears meter display instability, indicated by the observation that the value of the instrument within the ± 60kg constantly up and down, turning. Upon inspection, there is a road bridge sensors 30t column 6 line and good insulation between the inner shield, but is leakage between the elastomer shell (about 4M or so, with 20M range measuring), the other sensor is normal. Torn off the line after the sensor 7 troubleshooting, in this case, two red and white coats for the conventional method of signal lines will not work because of interference from the scale platform can be any of six lines an impact instrument. The correct way should be: (1) First, disengage the two signal cables between the junction box (7 lines full off) to observe the fault is excluded? Or disconnect the signal from the instrument measure the signal line cord inside and outside the shielding of insulation resistance between the lines. (2) and then in the terminal box of suspected torn off one by one sensor cable (the same seven lines full off) to observe whether the exclusion or failure of the sensor disengaged first check the insulation resistance measurement. (3) measuring sensor 6 signal line and the shield, and flexible insulation resistance between the body shell (normal should be for the ∞) Check whether the damage observed sensor cable? 5 Conclusion According to the phenomenon when the failure occurred, suggesting several possible ruled out one by one the reasons to find the exact cause of failure repair. Summarized above are some common electronic truck scale troubleshooting and maintenance methods, basically to meet the maintenance needs of the daily work of inspectors,[link widoczny dla zalogowanych], but in practice may encounter some less common, the more specific failure, which required We further study of theoretical knowledge, practical experience summed up and remove all kinds of electronic truck scale is faulty. Author: Zhao Yan, male, assistant engineer. Company: Institute of Measurement and Testing Huaibei City. Address: Huaihai Road, Huaibei City, Anhui Province, 235000 109. Received :2006-08-04 (Continued from page 24) AD517 is a precision monolithic operational amplifiers. It is modified by the laser can be obtained very low offset voltage and drift. AD517's offset voltage less than 2V, drift of less than 1.3 ~ zV / ~ C; AD517 open-loop gain of more than 100 times, for a wide range of load resistance, and a full range of input protection, allowing the differential input to supply voltage, input a current short-circuit protection circuit, and can drive capacitive loads of more than lO00pF low cost. AD517 well suited to be a long time in the required precision and stability of occasions. AD517 does not require the general application of zero, if needed in weak signal current amplifier zero adjustment can be achieved through external adjustment circuit 1,8 AD517 pin zero side, adjust the potentiometer resistance can be (1 ~ lOO) kn between the selected potentiometer center tap should be connected to the positive power supply. 4 724 improved results improved temperature calibrator mA current output can be achieved, the output signal stability,[link widoczny dla zalogowanych], field testing and calibration to meet the technical requirements. References [1] poetry white, Hua Chengying. Analog Electronics. Higher Education Press, 2002. [2] Yang Zhenjiang, Sun Zhanbiao. Intelligent Instrument and data acquisition system of the new devices and applications. Xidian University Press. 2001. About the author: XIE Peng, male, assistant engineer. Company: Guangzhou Institute of measuring and testing technology. Address: 510030, Guangzhou City, No. Yan Road, l1. Received :2006-08-08 (Continued from page 26) 3.6 display circuit and microcontroller (MCU) circuit due to space constraints,[link widoczny dla zalogowanych], display and micro-controller circuit will not repeat them. Interested readers may refer to the books. 4 Conclusion This article discusses the infrared remote control all electronic power meter of high precision,[link widoczny dla zalogowanych], good stability and secure, with the reverse direction and anti-tamper function; the user to purchase electricity eliminates a lot of unnecessary trouble, as long as the phone with the bank contact can be, who has access to users via the Internet into the bank's power management system to buy power. References [1] GB/T17215-1998 (, 1 and Level 2 static AC Power Meter> [2] U.S. company ADE7755 product information one by one AD 2004. Author: Huang ask you, man, electrical engineer . Work: Vocational and Technical Education. Mailing Address: Jiujiang City,[link widoczny dla zalogowanych], Jiangxi Province, 332 007. Xu Jianping, Vocational and Technical Education (Jiujiang 332007). Received :2006-07-14

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