barcode reader in asp.net codeproject A moving coil meter movement has a meter in Software

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250 A moving coil meter movement has a meter
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resistance rm = 200 and full-scale de ection is caused by a meter current Im = 10 A The movement must be used to indicate pressure measured by the
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Figure P251
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a Redesign the meter circuit required for these speci cations and draw the circuit between the terminals of the sensor and meter showing all appropriate connections b Determine the value for each component in your circuit c What is the linear range (ie, the minimum and maximum pressure that can accurately be measured) of this system
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Meter
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252 In the circuit shown in Figure P252 the
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temperature sensor and moving coil meter movement are used to monitor the temperature in a chemical process The sensor has malfunctioned and must be replaced with another sensor with the current-temperature characteristic shown (not the same as the previous sensor) Temperatures up to a maximum of 400 C must be measured The meter is rated at 25 k and 250 mV (full scale) Redesign the meter circuit for these speci cations
IT RS + VS Sensor 10 RM IT (ma) 5
300 T ( C)
Figure P253
Meter
a Draw the circuit between the terminals of the sensor and meter showing all appropriate connections b Determine the value of each component in the circuit c What is the minimum temperature that can accurately be measured
254 The circuit of Figure P254 is used to measure the
internal impedance of a battery The battery being tested is a zinc-carbon dry cell
IT (ma)
5 + rB 200 300 T ( C) 400 Battery Switch _ 10 Vout
Figure P252 Figure P254
a Draw the circuit between the terminals of the sensor and meter showing all appropriate connections b Determine the value of each component in the circuit c What is the linear range (ie, the minimum and maximum temperature that can accurately be measured) of the system
253 In the circuit in Figure P253, a temperature sensor
with the current-temperature characteristic shown and a Triplett Electric Manufacturing Company Model 321L moving coil meter will be used to monitor the condenser temperature in a steam power plant Temperatures up to a maximum of 350 C must be measured The meter is rated at 1 k and 100 A (full scale) Design a circuit for these speci cations
a A fresh battery is being tested, and it is found that the voltage, Vout , is 164 V with the switch open and 163 V with the switch closed Find the internal resistance of the battery b The same battery is tested one year later, and Vout is found to be 16 V with the switch open but 017 V with the switch closed Find the internal resistance of the battery
255 Consider the practical ammeter, diagrammed in
Figure P255, consisting of an ideal ammeter in series with a 2-k resistor The meter sees a full-scale de ection when the current through it is 50 A If we
2
Fundamentals of Electric Circuits
wished to construct a multirange ammeter reading full-scale values of 1 mA, 10 mA, or 100 mA, depending on the setting of a rotary switch, what should R1 , R2 , and R3 be
258 Using the circuit of Figure P257, nd the voltage
that the meter reads if VS = 10 V and RS has the following values: RS = 01rm , 03rm , 05rm , rm , 3rm , 5rm , and 10rm How large (or small) should the internal resistance of the meter be relative to RS
Switch
259 A voltmeter is used to determine the voltage across
a resistive element in the circuit of Figure P259 The instrument is modeled by an ideal voltmeter in parallel with a 97-k resistor, as shown The meter is placed to measure the voltage across R3 Let R1 = 10 k , RS = 100 k , R2 = 40 k , and IS = 90 mA Find the voltage across R3 with and without the voltmeter in the circuit for the following values:
2 k
Figure P255
256 A circuit that measures the internal resistance of a
practical ammeter is shown in Figure P256, where RS = 10,000 , VS = 10 V, and Rp is a variable resistor that can be adjusted at will
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