Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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%47
2_543370346422600284...
Ang a
CUL 100 A
Ay VI
T
Determine the value of additional series resistance required to convert
this voltmeter to an instrument with a range of 0-1,000 V dc.
7. Design a multirange voltmeter with ranges of 0-5 V, 0-10 V, 0-50 V,
and 0-100 V, using a 50-μA movement with internal resistance of 1,500
. Calculate (a) the values of the multipliers; (b) the sensitivity of the
instrument. Draw the circuit diagram of the completed design.
8. A dc microammeter with an internal resistance of 250 2 and a full-scale
deflection current of 500 μA indicates a current of 300 μA when connect-
ed into a circuit consisting of a 1.5-V dry cell and an unknown resistance.
Determine the value of the unknown resistance.
9. Design a series-type ohmmeter, similar to the circuit of Fig. 4-22. The
movement to be used requires 0.5 mA for full-scale deflection and has an
internal resistance of 50 . The internal battery has a voltage of 3.0 V.
CHẠP. 4
PROBLEMS
The desired value of half-scale resistance is 3,000 N. Calculate (a) the value
of resistors R, and R,; (b) the range of values of R,, if the battery voltage
may vary from 2.7 V to 3.1 V. Use the value of R, as calculated in (a).
10. A series-type ohmmeter, designed to operate with a 6-V battery, has
a circuit diagram as shown in Fig. 4-22. The meter movement has an
internal resistance of 2,000 and requires a current of 100 μA for full-
scale deflection. The value of resistor R, is 49 k. (a) Assuming that the
battery voltage has fallen to 5.9 V, calculate the value of R, required to
zero the ohmmeter. (b) Under the conditions :nentioned in (a), an un-
known resistor R, is connected to the meter, causing a 60 per cent meter
deflection. Calculate the value of the unknown resistor R₂.
11. The movement of the multirange voltmeter in Fig. 4-17 has a full-
scale current of 50 µA and an internal resistance of 2,000. The full-
scale meter reading is 150 V with the range switch set in position V₁,
50 V with the switch in position V₂, 10 V with the switch in position V₁,
and 1 V with the switch in position V. Calculate (a) the resistance of the
multipliers R₁, R₂, R₁, and R₁; (b) the sensitivity of the voltmeter.
12. A dc voltmeter is rated with a sensitivity of 10 kn/V and is used on
its 0-150-V range to measure the voltage across the 100-k resistor in Fig.
4-18. Determine the percentage error of the meter indication.
13. Design a volt-ohm-milliammeter with the following characteristics:
(a) Voltage ranges: 0-5, 0-25, 0-100, and, 0-500 V dc.
(b) Current ranges: 0-10, 0-100, 0-500, and 0-1,000 mA dc.
(c) Resistance ranges: 20 , 2,000 N, and 200 kN at half scale.
The movement used in this instrument is a basic d'Arsonval mechanism
with internal resistance of 1,500 and full-scale current of 50 μA. (Refer
to the circuit diagrams and description of the multimeter of Fig. 4-24 for
information about circuit arrangements.)
14. The dc voltmeter of Fig. 4-20(b) has a sensitivity of 1,000 M/V and a
full-scale ng of 100 V. The meter indicates 84 V as the voltage across
the load. Calculate the error in measuring the power dissipation of the load
by the voltmeter-ammeter method when the ammeter indicates a current
of (a) 50 mA; (b) 1 A; (c) 10 A.
91
۱۱:۱۷
←
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Transcribed Image Text:%47 2_543370346422600284... Ang a CUL 100 A Ay VI T Determine the value of additional series resistance required to convert this voltmeter to an instrument with a range of 0-1,000 V dc. 7. Design a multirange voltmeter with ranges of 0-5 V, 0-10 V, 0-50 V, and 0-100 V, using a 50-μA movement with internal resistance of 1,500 . Calculate (a) the values of the multipliers; (b) the sensitivity of the instrument. Draw the circuit diagram of the completed design. 8. A dc microammeter with an internal resistance of 250 2 and a full-scale deflection current of 500 μA indicates a current of 300 μA when connect- ed into a circuit consisting of a 1.5-V dry cell and an unknown resistance. Determine the value of the unknown resistance. 9. Design a series-type ohmmeter, similar to the circuit of Fig. 4-22. The movement to be used requires 0.5 mA for full-scale deflection and has an internal resistance of 50 . The internal battery has a voltage of 3.0 V. CHẠP. 4 PROBLEMS The desired value of half-scale resistance is 3,000 N. Calculate (a) the value of resistors R, and R,; (b) the range of values of R,, if the battery voltage may vary from 2.7 V to 3.1 V. Use the value of R, as calculated in (a). 10. A series-type ohmmeter, designed to operate with a 6-V battery, has a circuit diagram as shown in Fig. 4-22. The meter movement has an internal resistance of 2,000 and requires a current of 100 μA for full- scale deflection. The value of resistor R, is 49 k. (a) Assuming that the battery voltage has fallen to 5.9 V, calculate the value of R, required to zero the ohmmeter. (b) Under the conditions :nentioned in (a), an un- known resistor R, is connected to the meter, causing a 60 per cent meter deflection. Calculate the value of the unknown resistor R₂. 11. The movement of the multirange voltmeter in Fig. 4-17 has a full- scale current of 50 µA and an internal resistance of 2,000. The full- scale meter reading is 150 V with the range switch set in position V₁, 50 V with the switch in position V₂, 10 V with the switch in position V₁, and 1 V with the switch in position V. Calculate (a) the resistance of the multipliers R₁, R₂, R₁, and R₁; (b) the sensitivity of the voltmeter. 12. A dc voltmeter is rated with a sensitivity of 10 kn/V and is used on its 0-150-V range to measure the voltage across the 100-k resistor in Fig. 4-18. Determine the percentage error of the meter indication. 13. Design a volt-ohm-milliammeter with the following characteristics: (a) Voltage ranges: 0-5, 0-25, 0-100, and, 0-500 V dc. (b) Current ranges: 0-10, 0-100, 0-500, and 0-1,000 mA dc. (c) Resistance ranges: 20 , 2,000 N, and 200 kN at half scale. The movement used in this instrument is a basic d'Arsonval mechanism with internal resistance of 1,500 and full-scale current of 50 μA. (Refer to the circuit diagrams and description of the multimeter of Fig. 4-24 for information about circuit arrangements.) 14. The dc voltmeter of Fig. 4-20(b) has a sensitivity of 1,000 M/V and a full-scale ng of 100 V. The meter indicates 84 V as the voltage across the load. Calculate the error in measuring the power dissipation of the load by the voltmeter-ammeter method when the ammeter indicates a current of (a) 50 mA; (b) 1 A; (c) 10 A. 91 ۱۱:۱۷ ←
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