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8/13/2019 Digital Instrumentation
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Chapter 6
Revised by Abu Ubaidah
originally written by Khairul Azwan
8/13/2019 Digital Instrumentation
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Introduction
Revised by Abu Ubaidah
originally written by Khairul Azwan
8/13/2019 Digital Instrumentation
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Introduction..Revised by Abu Ubaidah
originally written by Khairul Azwan
8/13/2019 Digital Instrumentation
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Digital Multimeters (DMM)
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Digital Frequency
Meter
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Basic Circuit of aDigital Frequency Meter
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Frequency Measurement
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Digital Frequency Meter
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IEEE 488 BU
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Digital !oltmeters(D!M)
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DVM Characteristics
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"am# $ec%nique
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8/13/2019 Digital Instrumentation
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&d'antages and
Disad'antages
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Dual lo#e Integrating $y#eD!M (!oltage to $ime
Con'ersion)In ramp techniques, superimposed noise can cause large errors.
In the dual ramp technique, noise is averaged out by the positive andnegative rampsusing the process of integration.
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Principle of Dual Slope Type
DVM
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Integrating $y#e D!M(!oltage to Frequency
Con'ersion)
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Example
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rinci#les of &DC
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#eration of &DC Circuit
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uccessi'e #ro*imations
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Continuous Balance D!M or
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Continuous Balance D!M orer'o Balancing
otentiometer $y#e D!M
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+ i,Digit
"esolution and ensiti'ity of
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"esolution and ensiti'ity ofDigital Meters
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E*am#le -.+
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E*am#le -.4:
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The end..