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2019 Vol. 40, No. 6A
Published: 2019-12-28
 
1 Application of Laser Tracking Interferometer in Tests of Coordinate Measuring Machines
QIN Hai-meng, LIN Hu, XUE Zi, YANG Guo-liang, ZHANG Fu-min
DOI: 10.3969/j.issn.1000-1158.2019.6A.001
Laser tracking interferometer has self-tracking function, it is more convenient when measuring the diagonal of space compared to laser interferometer.And so Laser tracking interometer is used to test coordinate measuring machines, the corresponding principle and method are proposed and analyzed.Base station coordinate self-calibration experiments were carried out for Laser tracking interometer with different distributions, and the base station coordinate was basically the same, and on this basis, the comparative experiments of Laser tracking interometer and laser interferometer were carried out.The experimental results show that the maximum deviation is 0.37μm when measuring length of 500mm, it decreases to 0.1μm after linear compensation.Therefore, the correctness and feasibility of the detection method of laser tracking interometer are verified, which provides a more convenient method for coordinate measuring machines tests, and this method is especially suitable for large-scale coordinate measuring machines tests, where the physical standards are restricted as the limited size.
2019 Vol. 40 (6A): 1-7 [Abstract] ( 273 ) HTML (1 KB)  PDF (1386 KB)  ( 376 )
8 A Calibration Method for Large-scale Imaging Probe Measuring Machines Based on Line Scale Stitching
WANG Bing-he, KANG Yan-hui, SUN Shuang-hua
DOI: 10.3969/j.issn.1000-1158.2019.6A.002
In order to realize full range calibration of the large-scale imaging probe measuring machines scientifically, a method based on line scale stitchingwas developed. The method using the good repeatability of the imaging probe and the grating scale to get smaller stitching error through specific layout of the line scale. The length measurement error of the full range of XY measuring plane can be detected through this stitching method, which can ensure the accuracy of the whole measuring range. A demonstration for full range calibration of large-scale imaging probe measuring machine was provided, and the experiments and uncertainty analysis verified the feasibility of the method.
2019 Vol. 40 (6A): 8-11 [Abstract] ( 254 ) HTML (1 KB)  PDF (651 KB)  ( 373 )
12 Ranging Accuracy Calibration Technology of Total Station Based on Automatic Measurement System of Air Environment Parameters
LI Ping, LI Jian-shuang, HE Ming-zhao, LIU Xue-de, MIAO Dong-jing, ZHANG Fu-min, JIANG Yuan-lin
DOI: 10.3969/j.issn.1000-1158.2019.6A.003
The main factors affecting the ranging accuracy of total station on the field baseline are the unsynchronism of air refractive index compensation and the unevenness of the temperature field of the measuring optical path. In order to accurately calibrate the uncertainty of the total station in the field, the 1.2km air environment parameters automatic measurement system was developed, and the dense sensor array was used to automatically measure the environmental parameters along the baseline, the air refractive index real-time compensation total station distance measurement experiment was carried out. The experimental results showed that the ranging error was less than 0.070mm in 7s, and the maximum standard deviation of compensation value was 0.32mm in any 5min. The reliability of the total station ranging results can be effectively analyzed by using the automatic measurement system of environmental parameters.
2019 Vol. 40 (6A): 12-16 [Abstract] ( 226 ) HTML (1 KB)  PDF (1147 KB)  ( 217 )
17 The Effects of Different Setpoint to Measuring Accuracy and Service Life of a Probe on AFM
TANG Ying, CAO Cong, ZHANG Jian, ZHAO Dong-sheng
DOI: 10.3969/j.issn.1000-1158.2019.6A.004
The effects of different setpoints on image quality, measuring accuracy, wear pattern of probe and sample in different testing mode were investigated. The results indicated that in contact mode, the larger the setting of the bending amount, the greater the interaction force between the probe and the sample, the noise was decreased, the image quality was increased, however it caused great wear to the sample and the probe, and reduce the measurement accuracy. Generally, the hard sample with large surface fluctuation is suitable for this mode. In tapping mode, the needle set an amplitude, from the value starts, as the amplitude decreased, the measurement accuracy and probe wear degree increased firstly and then decreased, and the noise and wear were not large, so the mode suit for non sticky samples with smooth surface. In the intelligent mode, the parameters were adjusted automatically, and the wear of the sample and probe was small, but the influence by the noise was great and the accuracy was low when the measurement data was small.
2019 Vol. 40 (6A): 17-22 [Abstract] ( 292 ) HTML (1 KB)  PDF (2265 KB)  ( 462 )
23 Calibration and Comparison of a Spectral Confocal Sensor
YAN Yong-gang, LIU Zhi-hao, ZHU Xiao-ping, DU Hua, LI Jia-fu
DOI: 10.3969/j.issn.1000-1158.2019.6A.005
The error in the calibration of the spectral confocal sensor is mainly studied. The spectral confocal sensor was measured by a laser interferometer and a high-precision length measuring machine respectively, and the spherical probe was used to ensure that the optical path of the spectral confocal sensor was located at the center of the probe to ensure the accuracy of the spectral confocal sensor during measurement, and then replace the planar side head to calibrate the spectral confocal sensor. The measurement data was processed by the least squares method to obtain a nonlinear error of the measured data. The results showed that the nonlinear error of the high-precision length measuring machine is 0.030%, and the analytical linear error of the laser interferometer is 0.038%. The least squares method was used for data processing and nonlinear error calculation, which reduced the coaxiality error generated during calibration and the systematic error of the spectral confocal sensor, and improved the calibration accuracy of the spectral confocal sensor.
2019 Vol. 40 (6A): 23-28 [Abstract] ( 243 ) HTML (1 KB)  PDF (1295 KB)  ( 551 )
29 A Fast Performance Evaluation Method for 3D-laser Area Scanning System
ZHOU Sen, XU Jian, TAO Lei, CHEN Long, XIONG Yi-kun
DOI: 10.3969/j.issn.1000-1158.2019.6A.006
3D-laser area scanning techniques have been widely studied in academia and applied in industrial fields because of the benefits of fast massive acquisition of points, non-contact operation, and automatic data processing. However, the procedures for evaluation and verification of 3D-laser area scanner have not been well-established, because of many influencing factors such as scan depth, incident angle, scanners orientation and surface properties of measured area. A typical artifact with multiple spherical features made of ceramic has been introduced for determination of the sphere-spacing error and flatness measurement error. A 3D coordinate system was established by the orientation and the relative position between scanner and those spheres. A series of representative experiments were carried out on commercial 3D-laser area scanners produced by three corporations. The experimental results showed that the system sphere spacing repeatability error was better than 5.0μm, measurement uncertainty was less than 15.0μm, and the time for one test was less 0.5h. The evaluation procedure was easy-operator and effective.
2019 Vol. 40 (6A): 29-32 [Abstract] ( 260 ) HTML (1 KB)  PDF (853 KB)  ( 213 )
33 Comparison of Two Methods for Measuring the Error of CNC Machine Tool
ZHAO Dong-sheng, ZHANG Jian, JIA Min-qiang, LI Wei-jun, GUAN Qian-qian, ZHU Yue
DOI: 10.3969/j.issn.1000-1158.2019.6A.007
Positioning accuracy is one of the most important technical indicators of CNC machine tools, the commonly used methods to calibrate it are based on laser interferometer and step gauge. The characteristics of these two methods were analyzed and compared with the measurement examples. Some ways to improve the accuracy of these two methods were also given.
2019 Vol. 40 (6A): 33-35 [Abstract] ( 274 ) HTML (1 KB)  PDF (803 KB)  ( 203 )
36 Error Analysis of Two-dimensional Grating Calibration System Based on Orthogonal Dual-axis Laser Interferometer
DONG Xin-yuan, SUN Shuang-hua, CUI Jing-yuan, SHEN Xue-ping, DUAN Fa-jie, WANG Shu-hui
DOI: 10.3969/j.issn.1000-1158.2019.6A.008
In order to improve the calibration accuracy of two-dimensional grating measurement system, a study was carried out to establish a national standard device of two-dimensional grating calibration. A two-dimensional grating calibration method based on dual-axis orthogonal laser interferometer was studied, and a two-dimensional grating calibration experimental device of coplanar motion structure was established. A automatic control calibration program based on C# was developed to realize automatic calibration. The influences of two-dimensional grating installation error on the calibration result were analyzed. A black box model of angular error correction was proposed, and the working plane based on MATLAB least squares fitting algorithm was utilized.
2019 Vol. 40 (6A): 36-41 [Abstract] ( 263 ) HTML (1 KB)  PDF (1353 KB)  ( 746 )
42 Research on Multi-point Temperature Field Measurement System for Fiber Bragg Grating Measurement Environment
WEI Jin-he, CUI Jian-jun, ZHANG Fu-min, CHEN Kai, WANG Dong
DOI: 10.3969/j.issn.1000-1158.2019.6A.009
In order to accurately measure the ambient temperature value, control the ambient temperature field to be stable and uniform, and improve the test accuracy of the fiber grating strain sensor, the standard platinum resistance and multi-channel excellent thermocouple were designed in the performance test of fiber grating strain sensor and the calibration of key parameters. To realize the multi-point temperature field measurement method, the thermocouple calibration experiment and the system measurement uncertainty analysis in the temperature range of 3 °C at 20 °C were carried out, the actual measurement uncertainty of the whole system was within 5mK, which can meet the testing needs of fiber grating strain sensors.
2019 Vol. 40 (6A): 42-46 [Abstract] ( 237 ) HTML (1 KB)  PDF (682 KB)  ( 472 )
47 Calibration Method Research of Standard Hight-frequency Inductor
ZHAO Min, LIANG Qiong-chong, LI Sheng-chun
DOI: 10.3969/j.issn.1000-1158.2019.6A.010
By analyzed of the equivalent circuit of standard hight-frequency inductor and measurement principle of wide frequency RLC meter, a method of tracing calibration of hight-frequency inductor based on the resonance method is proposed. Standard capacitance and precision impedance analyzer are used as the main standard, with a test fixture, and the capacitance measurement and frequency setting ability of precision impedance analyzer are used to accurately calibrate inductance. The experiments on several sets of 5mH~5μH @ 0.1~10MHz hight-frequency inductors (7 for each set) show that the main error source is capacitance measurement error, and the uncertainty of measurement results is 0.1%~0.7%.
2019 Vol. 40 (6A): 47-50 [Abstract] ( 217 ) HTML (1 KB)  PDF (348 KB)  ( 177 )
51 Design of Programmable Conductive Ring Resistance Automatic Test System
YIN Cong-ru, SANG Shang-ming, WEN Xing-xi, LUO Zhen
DOI: 10.3969/j.issn.1000-1158.2019.6A.011
Aiming at the problems of low test efficiency and poor stability of the contact resistance test of the conductive ring due to the manual test of the contact resistance and insulation resistance of the conductive ring, a programmable conductive ring resistance automatic test system was designed. The conductive ring resistance automatic test system is composed of host computer software, milliohm meter GOM804, TOS7200 and switch matrix. The switch matrix receives the command from the host computer, controls the corresponding channel relay to close, and connects the tested conductive ring to the measurement channel. When one channel measurement is completed, the system automatically switches to the next channel for testing according to the node information in the test table. A high-speed automated test of the conductive ring is realized, the test efficiency is increased by more than 90%, and errors caused by manual operation are avoided, and the reliability of the test results is improved.
2019 Vol. 40 (6A): 51-55 [Abstract] ( 237 ) HTML (1 KB)  PDF (1283 KB)  ( 232 )
56 Design of Precise DC&AC Digital Ammeter
WANG Yi-zhou, DUAN Chang-sheng, WU Kang, JIAO Hai-ni, CUI Shao-ying, ZHANG Jun-qi
DOI: 10.3969/j.issn.1000-1158.2019.6A.012
A high-precision DC&AC digital ammeter with range 10A to 100A is introduced, which is based on fluxgate current sensor, precise resistor, 20-bit A/D converter and Raspberry Pi. Hard real time kernel and Hample Filter is applied to avoid the shortcomings of the Raspberry Pi in real-time hardware, highlighted with powerful calculate ability and flexibility. The ammeter achieved precise measurement with the relative error below ±0.02%, and is given the ability of storing measurement result, remote connection, rapidly software upgrading. The error level in theory is investigated in terms of circuit design and software design, keeping consistency with the experimental result.
2019 Vol. 40 (6A): 56-59 [Abstract] ( 215 ) HTML (1 KB)  PDF (365 KB)  ( 240 )
60 Comparative Study on Reliability Prediction Standard for Intelligent Meter
XIE Xin, WANG Li-min, ZHANG Hong-yu, CHEN Feng-kai, ZHOU Shao-yuan, HONG Tao
DOI: 10.3969/j.issn.1000-1158.2019.6A.013
As the main device for collecting electricity, the high reliability and long life of smart meter are particularly important.Reliability prediction is an effective means to quantitatively evaluate the reliability of smart meters and also provides a reference for the design improvement of smart meters.The key to carry out the prediction is the selection of reliability standard. The principle, process, advantages and disadvantages of the commonly used prediction standard are introduced.Three standards were selected to predict the reliability of a single-phase fee-controlled watt-hour meter. Through comprehensive analysis and comparison, the failure rate of GJB/Z299C was nearly twice higher than that of other standards.
2019 Vol. 40 (6A): 60-63 [Abstract] ( 241 ) HTML (1 KB)  PDF (363 KB)  ( 366 )
64 Development of Automatic Test System for Hand-held Digital Multimeter Based on Robotics
PENG Cheng, DING Wei, HOU Xu-wei
DOI: 10.3969/j.issn.1000-1158.2019.6A.014
To design an automatic calibration of the hand-held digital multimeter (DMM), which based on mechanical arm and machine vision. This paper describes the composition of the system, develops the automatic test program, the motion control system of the manipulator and the machine vision recognition system. This system can solve the problem of equipment calibration which can not be used for program-controlled communication or equipment calibration with high labor intensity, high repeatability and high risk. Recently, it has been verified by experimental test results that the system fully meets the requirements of relevant national standards, and has the advantages of high test efficiency and strong stability, which can reduce the labor cost to 30% of the original working mode.
2019 Vol. 40 (6A): 64-68 [Abstract] ( 247 ) HTML (1 KB)  PDF (771 KB)  ( 411 )
69 Metrological Calibration Program Based on LabVIEW Object-Oriented Programming Technology
DING Wei, PENG Cheng, LI Jun, HOU Xu-wei
DOI: 10.3969/j.issn.1000-1158.2019.6A.015
Aiming at the problems of code reuse, late maintenance, upgrade and expansion when using LabVIEW to build a large and complex test system, etc, LabVIEW object-oriented program (LVOOP) technology was studied, and the development of automatic test program for power supply based on object oriented in LabVIEW platform was realized. In summary, the automatic test system based on object-oriented programming technology has the advantages of simple program structure, less repetitive work, strong flexibility, expansibility, easy modification and maintenance, which improved the quality of the program, and reduced the cost of manpower and time to at least one-half of the original.
2019 Vol. 40 (6A): 69-74 [Abstract] ( 248 ) HTML (1 KB)  PDF (1349 KB)  ( 604 )
75 Application of New Type Quantum Hall Resistance Sample and Ultra-Stable Standard Resistor Tracking Measurement
CAI Jian-zhen, HUANG Xiao-ding, PAN Pan, GUO Bei-chen, YOU Li, WANG Wei, CHEN Shao-hua
DOI: 10.3969/j.issn.1000-1158.2019.6A.016
Several kinds of ultra-stable standard resistor were introduced. A new type quantum Hall resistance (NQHR) sample was developed. On the basis of the new type NQHR sample application, several kinds of ultra-stable standard resistor were measured without oil bath. Measurement data shows a new type passive ultra-stable resistor without temperature control having better performance than the tradition commercial resistor both in 24h noise distribution and temperature coefficient behaviors. Long term tracking measurement of the ultra-stable resistor indicated ultra-stable resistor has temperature delay effect. For better measurement, temperature control should be applied at least 3 days before measurement.
2019 Vol. 40 (6A): 75-78 [Abstract] ( 199 ) HTML (1 KB)  PDF (381 KB)  ( 140 )
79 A Method for Improving the Measurement Accuracy of Rectangular Pulse Current Amplitude
SUN Zhi, GAO Hai-feng, LI Jing-jing
DOI: 10.3969/j.issn.1000-1158.2019.6A.017
To Aiming at the problem of inaccurate measurement of pulse current amplitude by current probe matched with oscilloscope. Using the high-speed data acquisition function and NPLC function of Agilent 3458A digital multimeter. To data processing such as integrating the measured pulse amplitude. To presented A method of to improve the amplitude accuracy and effective digit of rectangular pulse current. To compose the pulse current measuring device of 3458A digital multimeter with pulse shunt. The experimental results show that the measurement uncertainty is better than 0.22%, the effective digits is better than 5 digits, the method is simple, the results are accurate and reliable. At the same time, to expound the automatic measurement project of pulse current amplitude based on programming software LabVIEW.
2019 Vol. 40 (6A): 79-83 [Abstract] ( 216 ) HTML (1 KB)  PDF (597 KB)  ( 417 )
84 Calibration of 1mT~2.5T Magnetometers
XU Yu, CAO Yan, CHEN Gui-ying, ZHOU Xin-hua
DOI: 10.3969/j.issn.1000-1158.2019.6A.018
In order to meet the calibration requirements of magnetometers ranging from 1mT to 2.5T, a magnetometer calibration device is designed, The constant magnetic field of the device is generated by magnetic field coil and electromagnet. The position adjustment device of the probe is controlled by computer, which can ensure that the Hall plate of the probe is perpendicular to the direction of the magnetic field. The whole measurement process is controlled by computer, which is convenient and fast. At the same time, the calibration method of the main technical parameters of magnetometer is expounded. The calibration method in the magnetic field of electromagnet is described in detail, which solves the difficult problem of magnetometer calibration. Finally, through calibrating digital magnetometer, the expanded uncertainty at the measurement point of magnetic field intensity 1T is 0.92mT.
2019 Vol. 40 (6A): 84-88 [Abstract] ( 235 ) HTML (1 KB)  PDF (924 KB)  ( 428 )
89 A Precision Phase Angle Measurement System for High Voltage Loss Calibration
YOU Li, JIN Hai-bin, ZHAO Wei, HOU Xu-wei
DOI: 10.3969/j.issn.1000-1158.2019.6A.019
To measure the phase angle precisely at high voltage loss calibration, a precision phase angle measurement system was developed based on dual channels digital sampling technology. The system mainly made up of two digitizes, one programmable switches set and one amplitude and phase measurement software to measure phase angle, and expand range through voltage dividers and shunts. The system could be self calibrated automatic, and it can correct system phase measurement errors, so it have excellent measurement performance at different phase angles,and phase measurement error can be verified at low power factor condition,its long term stability is also excellent, and uncertainty is less than 0.0005 degree at 50Hz power frequency. It can fulfill various electron-magnetism measurement applications.
2019 Vol. 40 (6A): 89-93 [Abstract] ( 219 ) HTML (1 KB)  PDF (930 KB)  ( 191 )
94 A Rapid Detection Method for Traffic Moving Objects Based on Image Processing
TANG Yuan-hui, ZHANG Li-hui
DOI: 10.3969/j.issn.1000-1158.2019.6A.020
Aiming at the problem of extracting and detecting movingobjections in the actual road environment, analyzes and summarizes the advantages and disadvantages of the current main detection algorithms, and proposes a method for quickly detecting moving targets by extracting the prior knowledge of vehicle entrances and exits, road spacing and so on. The experimental results show that for the case where the camera position is fixed and the background disturbance is not large, the background media construction and background reconstruction can be well realized by adaptive median filtering and multi-frame mean filtering, which reduces the computational complexity and the calculation amount is small.
2019 Vol. 40 (6A): 94-98 [Abstract] ( 236 ) HTML (1 KB)  PDF (1276 KB)  ( 280 )
99 Review Status and Analysis of Standard Resistors
CUI Shao-ying, HU Bei-bei, YAN Xiao-jun, ZHANG Jun-qi, JIAO Hai-ni, WANG Yi-zhou
DOI: 10.3969/j.issn.1000-1158.2019.6A.021
In this paper, the basic principle and characteristics of the standard resistor are studied, and the factors affecting the characteristics of the standard resistor are analyzed. According to the internal structure characteristics of the standard resistor, it is divided into two types: oil filled type and air filled type. The current situation of the standard resistor products at home and abroad is investigated, and the technical indexes of the standard resistor produced by different manufacturers under the same structure are compared, which can be measured The selection of DC resistance standard device in laboratory provides reference.
2019 Vol. 40 (6A): 99-102 [Abstract] ( 258 ) HTML (1 KB)  PDF (324 KB)  ( 274 )
103 Frequency Characteristic Analysis of Hall High Current Sensor
ZHANG Jun-qi, CHEN Shao-hua, JIAO Hai-ni, WANG Yi-zhou, CUI Shao-ying
DOI: 10.3969/j.issn.1000-1158.2019.6A.022
The second output signal of Hall high current sensor will be attenuated in its frequency characteristics. The frequency response tests of model LT1005-S 1000A high current sensor 50Hz~1kHz and LT2000-T 2000A high current sensor 50~400Hz were designed . The output performance of Hall high current sensor that the frequency characteristics of attenuation caused by the increase of the original current amplitude and frequency was objectively verified by data analysis and processing,the research can provide some data reference for the measurement calibration and practical application of Hall current sensor.
2019 Vol. 40 (6A): 103-106 [Abstract] ( 210 ) HTML (1 KB)  PDF (913 KB)  ( 197 )
107 Development of Automatic Calibration Device for Hand-held Digital Multimeter
KANG Ting-ting, ZHANG Lei, WANG Yue-tong, FANG Fei
DOI: 10.3969/j.issn.1000-1158.2019.6A.023
Digital multimeters are widely used in the fields of scientific research and production, national defense technology and industrial and agricultural production because of their various measuring functions. Compared with the desktop digital multimeter, the hand-held digital multimeter, can only display the measurement data through the LED digital tube on the display screen due to the lack of program control interface, and its automatic test is a difficult problem in the field of electrical measurement. The design idea and function modules of the hand-held digital multimeter calibration device were introduced. The device can satisfy the calibration work of daily hand-held digital multimeter, and its efficiency was improved by 72% on the premise of ensuring the accuracy of calibration results.
2019 Vol. 40 (6A): 107-110 [Abstract] ( 236 ) HTML (1 KB)  PDF (761 KB)  ( 163 )
111 Design of LCR Meter Based on Self-balancing Bridge
HU Bei-bei, WU Kang, JIN Hai-bin, YAN Xiao-jun, WANG Shu-qiang
DOI: 10.3969/j.issn.1000-1158.2019.6A.024
Commercial standard LCR meter used for traceability relies on import,and domestic commercial instruments cannot meet the requirements of impedance traceability. To solve the problem, A LCR meter with basic accuracy of ±0.02% was designed. The design principle and various methods for implementation were discussed. An impedance meter based on self-balancing bridge method was designed. The hardware of the LCR meter includes FPGA core board, half-bridge circuit board, embedded touch PC and power supply. The upper computer program was developed on VS2005 platform to exchange data with hardware through RS-232 interface and serial port communication protocol. Through experimental verification, the performance of the developed impedance measurement instrument is stable and reliable, which can meet the needs of high accuracy impedance traceability.
2019 Vol. 40 (6A): 111-115 [Abstract] ( 511 ) HTML (1 KB)  PDF (1185 KB)  ( 1141 )
116 Design of Virtual Intelligent Measuring and Management Device for Charging Pile Based on Cloud Platform
CHEN Lan-sheng
DOI: 10.3969/j.issn.1000-1158.2019.6A.025
In order to fully realize the intellectualization of safety detection, metering detection, energy and administration of new energy charging piles in operation, relying on the platform of Yunduan Peoples Livelihood Measurement Town, through reasonable integrated detection device development, short-distance wireless data transmission and cloud data storage and management, the data digitalization of charging system in the whole city was established. Modular management to realize real-time data management of charging system cycle verification and acceptance of goods on arrival;video surveillance of demonstration sites and safety inspection and monitoring of temperature and humidity on site;integration technology of computers and mobile phones to realize supervision departments, functional departments, operation enterprises, consumers and technology machines Cloud exchange and sharing within their respective roles and jurisdictions;realizing one-size-fits-all management of charging pile entities, and further promoting the implementation of on-site law enforcement inspection and on-site inspection of one-size-fits-all.
2019 Vol. 40 (6A): 116-121 [Abstract] ( 191 ) HTML (1 KB)  PDF (1694 KB)  ( 543 )
122 Design of Calibration Device Used for Dielectric Strength Test of Insulating Oil
ZHAO Yan, WANG Xin-yan, GUAN Ze-xin, WANG Da-long, SUN Xiao-yan
DOI: 10.3969/j.issn.1000-1158.2019.6A.026
Insulating Oil Dielectric Strength Tester has wide application for High voltage. There are many devices need to calibrate. The risk of the calibration process is large, and it is easy to cause personal injury and damage to the equipment caused by misuse.Domestic lack of specialized equipment. A special device is designed to guarantee the calibration process by the design of initiative breakdown module, protection module, sample processing module and to further strengthen the accuracy of the calibration.
2019 Vol. 40 (6A): 122-124 [Abstract] ( 204 ) HTML (1 KB)  PDF (844 KB)  ( 182 )
125 A Life Prediction Method of the Smart Meter Based on Weibull Distribution and Maximum Likelihood Estimation
WANG Rui, YANG Fan, YUAN Jing, XU Xin-ping
DOI: 10.3969/j.issn.1000-1158.2019.6A.027
With the extensively use of the smart meter, it becomes necessary to predict the reliability and life of the smart meter instead of the traditional on-site inspection method. A prediction method of the failure rate and life of the smart meter based on Weibull distribution was proposed. The shape parameter and scale parameter of Weibull distribution were calculated through maximum likelihood estimation method. The proposal method was showed to be reliable by predicting the average life, rated life and median life based on the status from MDS system of State Grid Corporation. And the predicted results are possible to help the performance evaluation and rotation work of the smart meter in the future.
2019 Vol. 40 (6A): 125-129 [Abstract] ( 250 ) HTML (1 KB)  PDF (589 KB)  ( 286 )
130 Design of Single-phase Electricity Meter with Clock Maintenance-free and Firmware Upgrade Easily
JU Han-ji, WANG Chen, DING Heng-chun, YUAN Rui-ming, ZHANG Jian-hui, PENG Xin-xia, YIN Jian-feng, GUO Jiao
DOI: 10.3969/j.issn.1000-1158.2019.6A.028
Aiming at the problem of large clock deviation of single-phase electricity meter in field operation and the need of promoting new business, a new kind of single-phase electricity meter with clock maintenance-free and firmware upgrade easily was proposed. Through the use of wireless clock synchronization technology to achieve automatic clock synchronization update, the test clock deviation was less than 2 seconds in the environment of -25~70℃;the firmware broadcasting upgrade technology was used to upgrade multiple single-phase electricity meters at the same time, the upgrade time was reduced to one fifth of the original time;the simple file system with low cost, high reliability, easy implementation and easy maintenance were adopted to realize automatic maintenance of storage data format. To avoid losing parameters and data. The design ensures that the clock accuracy is not affected by environmental factors, the upgrading efficiency is greatly improved, and the workload of on-site maintenance is greatly reduced.
2019 Vol. 40 (6A): 130-135 [Abstract] ( 257 ) HTML (1 KB)  PDF (2068 KB)  ( 137 )
136 Research on Integrated Decoupling Network of EMS Online Testing System for Electric Energy Meter
LIU Jian-bo, YANG Mei, LI Wen-qiang, MA Xue-feng, YAN Hong-rui, ZHAO Yan
DOI: 10.3969/j.issn.1000-1158.2019.6A.029
Aim at EMS tests for electronic power meter , which need disturbance resistance of electric fast transient pulse group, conduction disturbance resistance, conduction disturbance resistance etc., electrical meter verification device even can’t work properly due to interference. By designing a wide frequency voltage decoupling network and a current decoupling circuit, and a non-contact error module, a method to suppress the interference signal of EMS test was proposed. Complying by common mode high-frequency LC decoupling circuit, common mode mid-frequency LC decoupling circuit, differential mode LC decoupling circuit, secondary common mode high-frequency LC decoupling circuit, to improve the anti-jamming capabilities of voltage lines, current circuits and auxiliary signal lines which belongs to power meter verification devices, the stability of which is enhanced. The experimental results showed that the EMS anti-interference ability was improved significantly after adopting the decoupling network.
2019 Vol. 40 (6A): 136-139 [Abstract] ( 227 ) HTML (1 KB)  PDF (1038 KB)  ( 166 )
140 Design and Realization of Remote Measurement and Control System of Transformer Temperature Controller in Internet of Things Mode
XU Jing, LI Zheng-wen, LI Guang, WANG Chao, FAN You-zi
DOI: 10.3969/j.issn.1000-1158.2019.6A.030
Aiming at the problem of long time and dangerous operation of the transformer thermostat calibration test, the cloud computing technology was combined to study the transformer thermostat remote calibration device and its control technology. And a remote calibration system for transformer temperature measuring based on cloud technology is established. The system was equipped with a GPRS communication unit. And the plurality of constant temperature tanks, the switch quantity collecting system as well as the terminal equipment were unified through cloud technology for communication. Therefore remote intelligent identification, monitoring and hosting functions can be realized. The system was applied in a 220kV substation in Liaoning Province, and the whole process was running normally and efficiently.
2019 Vol. 40 (6A): 140-144 [Abstract] ( 224 ) HTML (1 KB)  PDF (1621 KB)  ( 648 )
145 Analysis of the Influence of the Size and Installation for Temperature Measuring Elements on the Calibration of CFV Nozzle Standard
LIU Zhe, ZHANG Fu-yuan, SONG Chao-fan, LI Zhen-lin
DOI: 10.3969/j.issn.1000-1158.2019.6A.031
In order to further verify the influence of temperature measuring element size and installation position on nozzle measurement data, the calibration data of nozzle standard device in station A, station B and station C were selected for comparative analysis with the standard value calculated by JJG 620, and the least square method was used for regression verification. The results show that the processing and installation of the temperature measuring elements should meet the requirements of JJG 620—2008 and GB/T 21188—2007, and the nozzle that does not meet the requirements of the temperature measuring elements should be used in the calibration range, not extended.
2019 Vol. 40 (6A): 145-149 [Abstract] ( 214 ) HTML (1 KB)  PDF (458 KB)  ( 299 )
150 Evaluation of Uncertainty in Detecting Dew Point of Natural Gas by Cooling Mirror Condensation Hygrometer
ZOU Wei
DOI: 10.3969/j.issn.1000-1158.2019.6A.032
The uncertainty analysis of dew point measurement of natural gas based on cooling mirror condensation hygrometer was carried out. The source of uncertainty was analyzed in detail by establishing mathematical model. The uncertainty components and synthetic uncertainty introduced in the process were evaluated. The results showed that the expanded uncertainty is 0.8℃ when the factor k=2 and the confidence probability is 95%. This method has the characteristics of fast measurement speed and high accuracy. It is suggested that the accuracy and reliability of the measurement results be further improved by increasing the number of tests and improving the proficiency of the inspectors.
2019 Vol. 40 (6A): 150-153 [Abstract] ( 268 ) HTML (1 KB)  PDF (324 KB)  ( 166 )
154 Inner Quality Management of Test & Calibration Laboratory Based on Risk Assessment
WANG Qian-juan, LI Jing-jing, LUO Chun-mei, JIN Hai-bin, WANG Wei
DOI: 10.3969/j.issn.1000-1158.2019.6A.033
To help Test & Calibration laboratories achieve a better performance in quality control, an inner quality management scheme that adapts to its own conditions and meets its unique need of development was designed. Based on the risk management philosophy, the risk identification and assessment tools were used. The principal of risk identification, a reference risk assessment model, identification and analyze of typical risks cases, measures of risk control in relevant to personnel, equipment and method, key points during the implementation of risk management were described.
2019 Vol. 40 (6A): 154-158 [Abstract] ( 296 ) HTML (1 KB)  PDF (723 KB)  ( 245 )
159 Synthesis of Probability Density Functions of Two Common Non-Normal Distributions
FEI Tian-hao, WANG Rui, BAN Ya, XU Xin-ping
DOI: 10.3969/j.issn.1000-1158.2019.6A.034
In order to solve the uncertainty evaluation problem of synthetic standard in measurement and test. First, the probability density function synthesis of simple two uniform distributions is carried out, and the two uniform distributions with different half-intervals are synthesized into trapezoidal distribution, and the two uniform distributions with equal half-intervals are synthesized into triangular distribution. Secondly, the expression of synthetic probability density function is given. The probability density functions of triangular distribution and uniform distribution are synthesized, and the expression of synthetic probability density function is obtained, and its image is drawn. The variance of synthetic distribution is calculated from the point of view of probability density function and the point of view of calculation of synthetic standard uncertainty respectively. The results obtained by the two methods are consistent, and the Monte Carlo method is used to simulate 60000 data which obey the uniform distribution and 60000 data which obey the triangle distribution. The curve obtained is completely consistent with the curve of the composite probability density function. The results are consistent and the correctness of the synthetic probability density function is verified.
2019 Vol. 40 (6A): 159-163 [Abstract] ( 245 ) HTML (1 KB)  PDF (668 KB)  ( 324 )
164 Research on Key Technologies and Methods for Improving the Reliability of Time-keeping System
BAN Ya, YUAN Jing, LIU Hong-jing, WANG Rui, YANG Fan, LUO Hao, FEI Tian-hao
DOI: 10.3969/j.issn.1000-1158.2019.6A.035
With the development of science, technology and economy, the generation and maintenance of stable and reliable time and frequency signals become increasingly important. In order to improve the reliability of the time-keeping system, the consistency test system of working clock and backup clock was constructed. The phase and frequency synchronization of the main and backup atomic clocks were realized by synchronization algorithm. The control method of atomic time under normal and abnormal traceable links was designed. The design requirements of software, hardware and environmental factors of the time-keeping system were expounded. Thus, the time-keeping system can meet the high reliability requirement in an all-round way.
2019 Vol. 40 (6A): 164-168 [Abstract] ( 225 ) HTML (1 KB)  PDF (1825 KB)  ( 226 )
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