Version 4
SHEET 1 880 1144
WIRE -1840 48 -1840 16
WIRE -1392 80 -1488 80
WIRE -1264 80 -1312 80
WIRE -1200 80 -1264 80
WIRE -1056 80 -1120 80
WIRE -992 80 -1056 80
WIRE -784 80 -912 80
WIRE -784 128 -784 80
WIRE -1488 144 -1488 80
WIRE -1840 176 -1840 128
WIRE -1744 176 -1840 176
WIRE -1744 192 -1744 176
WIRE -1840 208 -1840 176
WIRE -1264 208 -1264 80
WIRE -1056 208 -1056 80
WIRE -1488 304 -1488 224
WIRE -1264 336 -1264 288
WIRE -1056 336 -1056 288
WIRE -1840 352 -1840 288
WIRE -1840 560 -1968 560
WIRE -1840 608 -1840 560
WIRE -1648 608 -1728 608
WIRE -1568 608 -1648 608
WIRE -1088 624 -1264 624
WIRE -832 624 -1008 624
WIRE -1632 672 -1632 656
WIRE -1728 688 -1728 608
WIRE -1664 688 -1728 688
WIRE -1568 704 -1568 608
WIRE -1568 704 -1600 704
WIRE -1504 704 -1568 704
WIRE -1968 720 -1968 560
WIRE -1840 720 -1840 688
WIRE -1664 720 -1840 720
WIRE -1264 736 -1264 624
WIRE -1168 736 -1264 736
WIRE -832 736 -832 624
WIRE -832 736 -912 736
WIRE -1840 752 -1840 720
WIRE -1504 752 -1504 704
WIRE -1632 768 -1632 736
WIRE -1168 800 -1200 800
WIRE -880 800 -912 800
WIRE -1168 864 -1200 864
WIRE -800 864 -912 864
WIRE -736 864 -800 864
WIRE -1968 880 -1968 800
WIRE -1840 880 -1840 832
WIRE -1504 880 -1504 832
WIRE -736 880 -736 864
WIRE -1168 928 -1200 928
WIRE -880 928 -912 928
WIRE -736 976 -736 960
FLAG -1840 16 V+
FLAG -784 128 0
FLAG -1488 304 0
FLAG -1632 656 V+
FLAG -1840 880 0
FLAG -1648 608 U_ref
FLAG -1264 336 U_Rmess_1
FLAG -1056 336 U_Rmess_2
FLAG -1200 800 U_Rmess_2
FLAG -1200 864 U_Rmess_1
FLAG -880 928 U_ref
FLAG -800 864 U_Mess
IOPIN -800 864 Out
FLAG -880 800 V+
FLAG -736 976 0
FLAG -1504 880 0
FLAG -1840 352 V-
FLAG -1632 768 V-
FLAG -1200 928 V-
FLAG -1744 192 0
FLAG -1968 880 0
SYMBOL voltage -1840 32 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 6
SYMBOL res -1216 96 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R_Mess
SYMATTR Value {R_Mess}
SYMBOL res -1280 192 R0
SYMATTR InstName R_MUX3
SYMATTR Value 220
SYMBOL res -1072 192 R0
SYMATTR InstName R_MUX4
SYMATTR Value 220
SYMBOL current -1488 224 R180
WINDOW 0 24 80 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName I1
SYMATTR Value 20m
SYMBOL res -1296 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R_MUX1
SYMATTR Value 220
SYMBOL res -896 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R_MUX2
SYMATTR Value 220
SYMBOL Opamps\\LT1494 -1632 704 R0
SYMATTR InstName U1
SYMBOL res -1856 592 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res -1856 736 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL Opamps\\LT1167 -1040 832 R0
SYMATTR InstName U2
SYMBOL res -1104 640 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R_gain
SYMATTR Value 49.4
SYMBOL res -752 864 R0
SYMATTR InstName R_L
SYMATTR Value 10k
SYMBOL res -1520 736 R0
SYMATTR InstName R_L1
SYMATTR Value 10k
SYMBOL voltage -1840 192 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL voltage -1968 704 R0
SYMATTR InstName V3
SYMATTR Value 2.5
TEXT -1848 968 Left 2 !.step param R_Mess list 1u 10m 20m 50m 100m
TEXT -1848 1000 Left 2 !.op
TEXT -1856 1048 Left 2 ;.options abstol=1e-10
TEXT -1856 1088 Left 2 ;.options gmin=1e-10
TEXT -1128 560 Left 2 ;G=49.4k/Rg+1