Technology to Switch Range and Merge Channel in Electronic Current Transformer;

A kind of method of designing the automatic conversion of frequency meter range with CPLD;

Full-range Control for the Boiler Drum Water Level;

Study on relation between linearity and measuring range of variable-air span self-inductance (capacitance) type sensor;

The measuring range selection and measuring errors by analogue multimeter

The relationship between measuring range, c hord length and precision is offered.

A fluidic flowmeter with new structure is designed in this work on the basis of the traditional ones in order to widen its measurement range.

Under the background of EPW(earth penetrating weapon),a high-g piezoelectric accelerometer are designed,whose measurement range is 80,000g,and natural frequency is 10 kHz.

The dynamic range of accelerometer depends on the noise and the measurement range of the accelerometer system.

The design utilizes the single chip microcomputer AT89C51,the A/D Converter and the LED to realize a concurrent digital voltmeter,which can change the scale and display the number value automatically.

It is one of the key techniques to correct nonlinearity, scale and offsets in a measurement system.

Based on many years of practice experience and data accumulation of developing, debugging and using belt constant tonnage feeder, the author introduced how to select a belt constant tonnage feeder of the right type and specification by calculating the main mechanic parameters according to the practical need and the use span.