Version 4
SHEET 1 1532 680
WIRE -96 -208 -128 -208
WIRE -32 -208 -96 -208
WIRE 16 -208 -32 -208
WIRE 176 -208 96 -208
WIRE 240 -208 176 -208
WIRE 368 -208 320 -208
WIRE -128 -176 -128 -208
WIRE -128 -64 -128 -96
WIRE -96 -16 -128 -16
WIRE -32 -16 -96 -16
WIRE 16 -16 -32 -16
WIRE 144 -16 96 -16
WIRE 176 -16 176 -208
WIRE 176 -16 144 -16
WIRE 256 -16 176 -16
WIRE 368 0 368 -208
WIRE 368 0 320 0
WIRE 448 0 368 0
WIRE 528 0 448 0
WIRE -128 16 -128 -16
WIRE 256 16 176 16
WIRE -128 128 -128 96
WIRE -96 176 -128 176
WIRE -32 176 -96 176
WIRE 16 176 -32 176
WIRE 144 176 96 176
WIRE 176 176 176 16
WIRE 176 176 144 176
WIRE 240 176 176 176
WIRE -128 208 -128 176
WIRE 176 208 176 176
WIRE -128 320 -128 288
WIRE 176 320 176 288
FLAG -128 -64 0
FLAG -128 128 0
FLAG -128 320 0
FLAG 176 320 0
FLAG 144 176 Up
FLAG 144 -16 Um
FLAG -96 176 U1
FLAG -96 -16 U2
FLAG -96 -208 U3
FLAG 528 0 Ua
DATAFLAG 448 0 ""
DATAFLAG 176 -208 ""
DATAFLAG 240 176 ""
DATAFLAG -32 -16 ""
DATAFLAG -32 -208 ""
DATAFLAG -32 176 ""
SYMBOL res 0 192 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 160 192 R0
SYMATTR InstName R5
SYMATTR Value 5k
SYMBOL res 0 0 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 2k
SYMBOL res 0 -192 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 3k
SYMBOL Opamps\\opamp 288 -64 R0
SYMATTR InstName U1
SYMBOL res 224 -192 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 4k
SYMBOL voltage -128 -192 R0
SYMATTR InstName V3
SYMATTR Value 0
SYMBOL voltage -128 0 R0
SYMATTR InstName V2
SYMATTR Value 2
SYMBOL voltage -128 192 R0
SYMATTR InstName V1
SYMATTR Value 1
TEXT -128 -320 Left 2 !.op
TEXT -48 -320 Left 2 !.lib opamp.sub
TEXT 624 -320 Left 2 ;Up = U1*R5/(R1+R5)\n--------------------------\n \nUm = Up\n \nI2 = (U2-Up)/R2\n \nI3 = (U3-Up)/R3\n \nUa = Um -(I2+I3)*R4\n \nUa = Up -((U2-Up)/R2 + (U3-Up)/R3)*R4\n \nUa = Up + (Up/R2 + Up/R3 -U2/R2 -U3/R3)*R4\n-----------------------------------------------------------\n \n \nMit Scilab\n \n-->R1=1e3;R2=2e3;R3=3e3;R4=4e3;R5=5e3;U1=1;U2=2;U3=0;\n \n-->Up=U1*R5/(R1+R5)\n Up  =\n \n    0.8333333  \n \n-->Ua=Up + (Up/R2 + Up/R3 -U2/R2 -U3/R3)*R4\n Ua  =\n \n  - 0.3888889