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在模拟输入信号较小时,如0~0.5伏时,自动调零电容可选比积分电容CINT大一倍,以减小噪声,CAZ的值越大,噪声越小,如果CINT选为0.15μF,则CAZ=2CINT=0.33μF。
由传感器传来的微弱信号经放大器放大后为0~5V,这时噪声的影响不是主要的,可把积分电容CINT选大一些,使CINT=2CAZ,选CINT=0.33μF,CAZ=0.15μF,通常CINT和CAZ可在0.1μF至1μF间选择。积分电阻RINT等于满度电压时对应的电阻值(当电流为20μA、输入电压=4.096V时,RINT=200kΩ),此时基准电压V+RI和V-RI之间为2V,由电阻R1、R3和电位器R2分压取得。
本电路中,CE/LOAD引脚接地,使芯片一直处于有效状态。RUN/HOLD(运行/保持)引脚接+5V,使A/D转换连续进行。NDH DELCO QN0L11 SUPER PRECISION BEARING SET, NIB
EFC 647T35 BELL CUP, 70 MM, 72 HOLES, NEGATIVE EDGE, NI
OMRON TL-X5Y1-52 120 VAC PROXIMITY SWITCH, LOT OF 4, NI
NELES-JAMESBURY 5H22HBRT HIGH PRESSURE BALL VALVES 1 1/
SEW EURODRIVE DFT80K4BMG05HFT?HIS AC MOTOR WITH BRAKE, 0
PARKER, D63W1D45YVY33, HYDRAULIC DIRECTIONAL VALVE, 110
PARKER, D31FSE01B4NXP03?0, PROP VALVE, 350 BAR MAX, NNB
GENERAL ELECTRIC TH3362J FUSIBLE HEAVY DUTY SAFETY SWIT
ALLEN BRADLEY 2711-NMS EEPROM MEMORY UPGRADE KIT, NNB
ALLEN BRADLEY 2711-NMS EEPROM MEMORY UPGRADE KIT, NIB
SQUARE D 8538 SCG 14 AFP1T SIZE 1 COMBINATION STARTER
SCIEMETRIC 315 TEST AND ANALYSIS SYSTEM
FANUC A20B-2901-0320 DAUGHTER BOARD, NNB
DONGAN 61-1465SH GENERAL PURPOSE TRANSFORMER, 1 PH, 10