Sampling Technique Applied to Measuring Instruments
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Transcript of Sampling Technique Applied to Measuring Instruments
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Sampling TechniqueSampling TechniqueApplied to Measuring Instruments Applied to Measuring Instruments
Dr T S Rathore, F IETE, F IE, M ISTEDr T S Rathore, F IETE, F IE, M ISTE
Department of Electrical EngineeringDepartment of Electrical Engineering
Indian Institute of Technology BombayIndian Institute of Technology Bombay
Powai, Mumbai 400 076Powai, Mumbai 400 076
email: [email protected] Website: www.ee.iitb.ac.in\~tsrathor
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Sampling to find -
Types
- Asynchronous sampling
- Synchronous sampling
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where,
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Case I:
Case II:
But,
and
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has to be zero
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have to be zero
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a) Using analog wattmeter
Drawbacks-low torque- friction-Temperature errors- power loss- lack of balance- low band-width
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b) Using digital wattmeter (Sampling wattmeter)
Asynchronous type
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Truncation error
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Synchronous type
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3.
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4.
-by converting current into proportional voltage
- by using difference amplifier to produce Vo IR
5. Volt amperes (VA), Reactive power, Power factor measurement
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