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。ALLEN BRADLEY 1775 KA COMMUNICATIONS ADAPTER, NIB
SEW EURODRIVE FA67AM145 PARALLEL SHAFT HELICAL GEAR RED
FAFNIR 3MM9122WI CR DUL SUPER PRECISION BEARING ? SET,
TIMKEN / FAFNIR 3MM9122WI DUL SUPER PRECISION BEARING ?
ALLEN BRADLEY 230/460V 1HP CONTROL MATCHED AC MOTOR 132
SQUARE D FA36060 600 VAC 250 VDC 30 AMPS 50/60 HERTZ CI
VICKERS DG5S8 33C 2 MFT WLB 5 30, DIRECTIONAL VALVE, 1/
VICKERS, V10 1S7S 1A20, SINGLE VANE PUMP, 1" AND 1/2" N
GRACO 220 571 SERIES 094B SENATOR AIR MOTOR
GRACO 220 571 SERIES 187A SENATOR AIR MOTOR
RED LION CONTROLS IMP20162 APOLLO INTELLIGENT METER, NI
VICKERS XCG-03-1B-30 3/8" NPT 1000 PSI REDUCING VALVE
LITTLEFUSE FLSR 45 45 Amp POWR-GARD, CLASS RK5, FUSE, L
SMC, CKP1B63-125YL, CLAMP CYLINDER, 63 MM BORE, 125 MM
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