Maxwell vacuum gauge PM-2 manufacturers _ force measurement since the instrument _ Guangdong Maxwell Maxwell vacuum gauge vacuum gauge measuring the force provided by the Shanghai Automation Instrumentation Co., Ltd. Shanghai Automation Instrumentation Co., force measurement (www.licesh.com) is specialized in the "industrial thermocouple, RTD, compensation wire, high temperature conductors" of the enterprise, the company adhering to the "honesty, hard service" concept, to provide you The most high-quality products and services. Welcome to inquire! Contact: Hua powder. PM-2 type currently on the market combined Maxwell vacuum table, which contains the PM-3 and PM-4 type using vacuum gauge measuring range McNamara PM-2 manufacturing, sub 200Pa ---- 10000Pa and 0.1Pa-- -350Pa two stages Maxwell vacuum gauge, overshadowed the original PM-4 and PM-3 products currently on the market used in PM-3 type-based Maxwell vacuum gauge PM-2 price, it's more accurate than Traditional PM-4-type vacuum gauge Maxwell higher PM-2 direct sales, the volume is smaller. Signal conditioning circuit for a high input impedance differential amplifier. A1, A2 constitute op amp input stage two, and then with the A3 series consists of three op amp differential amplifier circuit. In this circuit, the completely symmetrical A1 and A2 increases the signal to noise ratio; the circuit of the common mode signal is almost no amplification, the common-mode rejection ratio. The amplification factor of the differential amplifier circuit is calculated as in formula (1) shown in the circuit design of the resistance R 1 = R2 = 24 k ohm, RG = 2k Ohms, so that the magnification of 25 times the difference signal, the original signal can be exactly zoom to the desired A / D acquisition signal levels. Resistance R0 = 470 ohms, for the protection of the op amp input stage.