RTD Interface Problem #2: The circuit below was briely discussed earlier in the course. This is an RTD interface which means it is fundamentally an ohmmeter. The block X1 develops a known current of 1mA which will then develop a voltage across the RTD (R5). The resistors R1-3 represent the resistance of the "lead" wires going out to the RTD which is typically located a long distance (100's to 1000's of feet) from the shown circuit. Assume you need to reverse engineer this circuit to determine what blocks 1-3 are doing. So describe the outcome of your reverse engineering and the purpose of every component in those blocks with the exception of R11 which will be discussed in a future lecture.

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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RTD Interface
Problem #2: The circuit below was briely discussed earlier in the course. This is an RTD interface
which means it is fundamentally an ohmmeter. The block X1 develops a known current of 1mA which
will then develop a voltage across the RTD (R5). The resistors R1-3 represent the resistance of the
"lead" wires going out to the RTD which is typically located a long distance (100's to 1000's of feet)
from the shown circuit. Assume you need to reverse engineer this circuit to determine what blocks 1-3
are doing. So describe the outcome of your reverse engineering and the purpose of every component
in those blocks with the exception of R11 which will be discussed in a future lecture.
1mA
R5
50%
600
VEE
tran 0 10m 0 startup
مها
vcc vcc VEE VEE
VIN IOUT
20k
U1
block
block
0.22
40.2k
3.74k
R11
R13
U3
LT1097
40.2k
LT1097
12k
R14
block
1
R10
LT1097
Yout
Transcribed Image Text:RTD Interface Problem #2: The circuit below was briely discussed earlier in the course. This is an RTD interface which means it is fundamentally an ohmmeter. The block X1 develops a known current of 1mA which will then develop a voltage across the RTD (R5). The resistors R1-3 represent the resistance of the "lead" wires going out to the RTD which is typically located a long distance (100's to 1000's of feet) from the shown circuit. Assume you need to reverse engineer this circuit to determine what blocks 1-3 are doing. So describe the outcome of your reverse engineering and the purpose of every component in those blocks with the exception of R11 which will be discussed in a future lecture. 1mA R5 50% 600 VEE tran 0 10m 0 startup مها vcc vcc VEE VEE VIN IOUT 20k U1 block block 0.22 40.2k 3.74k R11 R13 U3 LT1097 40.2k LT1097 12k R14 block 1 R10 LT1097 Yout
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