A bridge circuit, has shown in the following figure, is used to measure the value of the unknown
resistance (R = 501 2) of a strain gauge. The output voltage measured across points DB in the
bridge is measured by a voltmeter. Calculate the measurement sensitivity in volts per ohm
change in R, if:
a) resistance R, of the measuring instrument is neglected.
b) account is taken of the value of Rm
C
D
Ru
5000 Ω
R3
Rm
10 ΚΩ
Vm
R₁
R₂
.500 Ω
5000 Ω
B
10 V