A moving-coil meter movement has a meter resistance rM = 200 ? , and full-scale deflection is caused by a meter current im = 10?A. The meter is to be used to display pressure, as measured by a sensor, up to a maximum of 100 kPa. Models of the meter and pressure sensor are shown in Figure P2.71 along with the relationship between measured pressure and the sensor output vT .
a. Devise a circuit that will produce the desired behavior of the meter, showing all appropriate connections between the terminals of the sensor and the meter.
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?
Known quantities:
Meter resistance of the coil; meter current for full scale deflection; max measurable pressure.
Find:
a) The circuit required to indicate the pressure measured by a sensor
b) The value of each component of the circuit; the linear range
c) The maximum pressure that can accurately be measured.
Assumptions:
Sensor characteristics follow what is shown in Figure P2.71
Analysis:
a) The upper and lower terminals of the sensor is attached to the upper and lower terminals of the meter, respectively. A series resistor to drop excess voltage is required.
b) At full scale, meter:
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