тм Sensor Meter 10 50 100 P (kPa) (Au) 4A
A moving-coil meter movement has a meter
resistance rM = 200 , and full-scale deflection is
caused by a meter current Im = 10 μA. The movement
must be used to indicate pressure measured by the
sensor up to a maximum of 100 kPa. See
Figure P2.71.
a. Draw a circuit required to do this, showing all
appropriate connections between the terminals of
the sensor and meter movement.
b. Determine the value of each component in the
circuit.
c. What is the linear range, that is, the minimum and
maximum pressure that can accurately be
measured?
(a)
The required circuit diagram is shown below:
(b)
According to the question, the maximum sensor pressure is 100 kPa.
From the graph of the pressure vs voltage, the value of the terminal voltage can be written as
Therefore, the value of the source voltage VS will be
The voltage value of the meter will be
Substituting
The value of the resistor RS will be
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