Early days, tally counter is mechanical, although the result is the same as traditional data, the effect is a little away from the digital counter. Moreover, it is also useful, because in a way than the traditional long life. Somehow, it is more durable, a good design. In addition, it has a large and high contrast screen, we can easily read. Moreover, it can be a double feature. Somehow, you can do manual or electronic application. In addition, the battery compartment is located in a fast, convenient side. Mainly, it is in transport, livestock, and goods in line. It also includes inventories in line. However, this does not count electronic counter rapid application undesirable. In fact, this gadget is only the normal rate of two per second, more does not apply. As a matter of fact, the instrument is the simplest form, this will give us the second pulse. Within a given time the number of digital circuit technology and digital devices using pulse counting the number of results displayed. Electronic Counter is the basis for other digital devices. Access to the module in its variety of input channels - digital converter, and use the appropriate means of sensors can be molded into figures. Electronic counters, high precision, wide range of functions has many advantages, simple operation, high speed, Zhijie shows the number, but also easy to implement industrial production and scientific experiment automatic measurement Guocheng Jiang, has been widely used. Electric digital voltmeter digital voltmeter and Electronic Counter is typical of measuring instruments and digital basis. Digital voltmeter is the core of the analog - digital converter. Mold - digital conversion circuit is divided into integral and non-integer type. Continuous servo comparison, contrast successive approximation, ramp-type and ladder wave of non-integer type; voltage - frequency conversion, voltage dual-slope - the time change and pulse width modulation is considered indispensable. Dual slope voltage - time converter (Figure 2a) better performance, its accuracy depends only on the reference voltage and precision, while an integral part and the oscillator frequency stability requirements only, while the absolute value does not affect converter Accuracy can be greatly simplified the process of production and commissioning.