National Semiconductor's MM5777 calculator chip requires only one keyboard, NSA1161 LED display, DS8977 digital driver and 9V battery to calculate addition, subtraction and multiplication. The calculator chip contains keyboard decoding and keyboard debounce circuitry, as well as all clock generators and timing pulse generators. The segments of the LED can be driven directly without the need for multiplex technology. The seventh position can be used as a six-digit negative sign as well as an error indicator. Includes leading and post zero suppression.
Marine flowmeter is divided into LC elliptical gear flowmeter and lxz Spiral Rotor Flowmeter. It is widely used in commercial trade measurement in shipbuilding, petrochemical and other departments And engineering management control.
Marine flowmeter is a precision instrument used to measure liquid flow. It is a direct reading cumulative instrument. It is a positive displacement flowmeter that measures the total liquid flow through the pipeline. Elliptical gear flowmeter can select two counting mechanisms: mechanical display meter and electronic display meter. The display meter has the functions of displaying cumulative flow, instantaneous flow and zero return, which can realize on-site display and remote control. For different measuring media (acid, alkali, organic liquid, oil, food, etc.), the flowmeter can be made of different materials (cast steel, stainless steel and 316), which is suitable for flow measurement in industrial departments such as chemical industry, petroleum, medicine, electric power, metallurgy and food. The flowmeter with sending function can be matched with hy-908 series flow totalizer and other instruments of the company, which is convenient for centralized detection, output standard signals, automatic control and data processing, and can be directly connected with the computer.
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