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1、POWER SUPPLY PROJECTAGILENT 6612C (KEYSIGHT 6612C) POWER SUPPLY REPLACEMENT.內容Feature3Key parts4OPA547T TO2204Arduino Mega-25605Arduino Mega2560 extension board (shield) (mega2560 扩展板)7INA219 power monitor8LCD display i2C10to220散热片10Dc POWER SUPPLY11BOM12Schematic13OPAMP opa54714I_LIM Formula14Vout
2、Formula:15Arduino Board connection16current limit calibration17wIRE sOLDERING錯誤! 尚未定義書籤。Calibration23Test equipment requirement:23Calibration procedure23FEATURESCPI command supportInterface: Com port (protocol: 9600,N, 8,1 )Voltage output: 09VCurrent Output: 0200mA ( max 500mA but need heat sinking
3、solution)Measurement capability:Hight +26V 1ALow 16V, 400mAMeasure speed: +2.4 V (working mode)V_+E/S LOW (output disabled) E/S Pin Forced LOW (V) +0.8 V (Thermal Shutdown Status) E/S pin Force low to disable outputCURRENT LIMIT CALIBRATIONI_lim=(Vbase-Vadc)*rateX=VbaseY= rateI_lim= (X- Vadc ) *YSet
4、 device:Volt 2VOUT 1Debug:1PWM:3: 714 ( expect around 200mA current limit.) record current by current meter. (I_200mA)PWM:3 843 ( expect around 100mA current limit.) record current by current meter. (I_100mA)Put equation in website I_200mA=(x-714)*y , I_100mA=(x-843)*ya= I200mA Actual measurement cu
5、rrent under 200mA settingb= I100mA Actual measurement current under 100mA settingx=( 843*a-714*b)a-by=a-b( 843-714)To get X and Y value.Case 1: I_200mA= 142mAI_100mA=77.8mA142=(x714)y77.8=(x843)yX=999.33, Y=0.4977Put both value in FW code ADC_Base =X , Rate=YWIRE SOLDERINGPICTURESUSB EXTENSION CABLE
6、CALIBRATION Calibration procedure implemented in GTS scrip file.TEST EQUIPMENT REQUIREMENT: 1: voltage meter2: current meter (range 0 200mA)3 DUT (with external power plug 12V/ 2A)CALIBRATION PROCEDURE 儀器準備:電流表 0200mA 電流表 ( 需要越精準越好)步驟l RUN scrip file. Maetay6612_calibration.xmz (需安裝 GTS )l 先不掛上 電流表l 程式會自動挑整電壓到 5V l 按照指示 (Apply Current Meter) 掛上 電流表( 一端接地 一端接輸出 ) 使其輸出大電流進入電流保護 狀態l 輸入電流表讀到的電流值 (mA) 70100 左右l 輸入完 按 enterl 再次 輸入電流表讀到的電流值 (mA) 140150 左右l 輸入完 按 enterl 再次 輸入電流表讀到的電流值 (mA) 150 左右l 輸入完 按 enterl 拿開 電流表 (Remove Current Meter)l 完成校驗
