The error test of the taximeter is divided into two aspects: (1) the test about time error of the taximeter (2) distance test
about the usage error of the machine. The paper first gives the working principle of the meter and the principle of error
verification device. Based on JJG517 - 2009 "Taximeter Verification Regulation ", the paper focuses on analyzing the
machine error and test error of taxi meter. And the detect methods of time error and distance error are discussed as well.
In the same conditions, standard uncertainty components (Class A) are evaluated, while in different conditions, standard
uncertainty components (Class B) are also evaluated and measured repeatedly. By the comparison and analysis of the
results, the meter accords with JJG517-2009, "Taximeter Verification Regulation ", thereby it improves the accuracy and
efficiency largely. In actual situation, the meter not only makes up the lack of accuracy, but also makes sure the deal
between drivers and passengers fair. Absolutely it enriches the value of the taxi as a way of transportation.
This paper is based upon National Standards for EMC. For the problem that the intensity of electromagnetic radiation in
the meter with the THG at 36MHz is seriously more than National Standards, by studying the theory of radiation
emission and analyzing the formation mechanism of electromagnetic radiation interference, it proposes three restrain
measures: 1.the improvement of the Crystal oscillator's grounding measure; 2.adding a RC filter circuit to the Crystal
oscillator circuit; 3.the improvement of the tax's communication cable, solving the problem that radiation harassment the
taxi meter seriously exceeds. The experimental result demonstrates that the radiation intensity of tax meter improved
with the general measures meet the requirements of the national standard, making more than 32000 taxes in Tianjin
install this green meter, protecting the safety of staff and normal operation of the surrounding equipment.
The traditional high frequency thermal bonding machine had serious radiation problems at dominant frequency, two
times frequency and three times frequency. Combining with its working principle, the problems of electromagnetic
compatibility were studied, three following measures were adopted: 1.At the head part of the high frequency thermal
bonding machine, resonant circuit attenuator was designed. The notch groove and reaction field can make the radiation
being undermined or absorbed; 2.The electromagnetic radiation shielding was made for the high frequency copper power
feeder; 3.Redesigned the high-frequency oscillator circuit to reduce the output of harmonic oscillator. The test results
showed that these measures can make the output according with the national standard of electromagnetic compatibility
(GB4824-2004-2A), the problems of electromagnetic radiation leakage can be solved, and good social, environmental
and economic benefits would be brought.
Gas Logging is important for discovering and evaluating oil gas zones in the course of logging. Aimed at the features of gas logging in our country, a new method of automatic vacuum mud still (AVMS) is presented for the first time, which has no basic distortion of gas samples and overcomes the limitations of basic distortions caused by uncontrolled blending air in the samples in traditional degassing methods. This paper develops the theoretical basis of the system design, the working principle of AVMS, the gas flow path and its characteristics. It is proved by experimental results, that the hydrocarbon content of the sample produced by this system is ten times higher than by routine degasser. As a result, the accuracy of gas reconnaissance is improved.
This paper introduces a new method to detect drilling fluid density based on intelligent sensor, the core of which is
silicon resonant sensor technology. Two H model resonant beams locating single crystal silicon resonant sensor con vert
differential pressure to frequency signals respectively, then difference of two frequency signals are transmitted to CPU,
export 4~20mA signal corresponding drilling fluid density after D/A converter. This method get over the short comings
of typical drilling fluid density detection used piezocapacitive sensor, such as low accuracy, shattered easily, easy drift
...ect., has high precision, stability and reliability characters.