A moving coil instrument whose resistance is 25 ohm gives a full scale deflection with a current of 1 mA. This instrument is to be used with a manganin shunt to extend its range to 100 mA. Calculate the error caused by a 10°C rise in temperature when: I (1) Copper moving coil is conn manganin shunt. onnected directly across the | (2) A 200 manganin resistance is used in series with the instrument moving coil. The temperature co-efficient of copper is 0.004/°C and that of manganin 0.00015/°C.
A moving coil instrument whose resistance is 25 ohm gives a full scale deflection with a current of 1 mA. This instrument is to be used with a manganin shunt to extend its range to 100 mA. Calculate the error caused by a 10°C rise in temperature when: I (1) Copper moving coil is conn manganin shunt. onnected directly across the | (2) A 200 manganin resistance is used in series with the instrument moving coil. The temperature co-efficient of copper is 0.004/°C and that of manganin 0.00015/°C.
Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Transcribed Image Text:A moving coil instrument whose resistance is 25 ohm gives a
full scale deflection with a current of 1 mA. This instrument is
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to be used with a manganin shunt to extend its range to 100
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mA. Calculate the error caused by a 10°C rise in temperature
when:
I
(1) Copper moving coil is connected directly across the
manganin shunt.
(2) A 200 manganin resistance is used in series with the
instrument moving coil. The temperature co-efficient of copper
is 0.004/°C and that of manganin 0.00015/°C.
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