Instrumentation & Measurement Society1 IEEE Instrumentation and Measurement Society 2012.
Measurement & instrumentation ppt
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Transcript of Measurement & instrumentation ppt
![Page 1: Measurement & instrumentation ppt](https://reader035.fdocuments.net/reader035/viewer/2022062302/5874218b1a28abcb5b8b8115/html5/thumbnails/1.jpg)
Prabhu Mike
MEASUREMENTS &
INSTRUMENTATION
R. Prabhu13291218-02-2015
2/18/2015
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Prabhu Mike
TONG TESTERTong tester is used to measure voltage and current from the live supply wire.Construction:It consists of two clamps arranged in the form of ring. One is stationary and the other is movable due to the presence of spring.It is commonly used in industries.
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Prabhu Mike
Tong tester…
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Prabhu Mike
RECORDER
• Recorder is a device which records electrical and non electrical quantities as a function of time. Current and voltages can be recorded directly, while the non electrical quantities are recorded indirectly.
• Types of recorders: 1. Analog recorders 2. Digital recorders
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Prabhu Mike
• Analog recorders are further divided in to three types:
• 1. Graphic recorder a. strip – chart recorder b. circular chart recorder c. X – Y recorder• 2. Oscillographic recorder• 3. Magnetic – tape recorder a. Direct recorder b. F. M. recorder c. pulse modulation recorder2/18/2015
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Prabhu Mike
X – Y RECORDER
• X-Y recorder is an instrument which gives a graphic record of the relationship between two variables. We may say X-Y recorder is one which records the variation of one physical quantity against another physical quantity.
• It is used to measure voltage, current, frequency, power factors etc….
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Prabhu Mike
Construction:
• X-Y recorder consists of a pair of servo-systems, driving a recording pen in two axis on stationary paper chart. Attenuators are used to bring the input signal to the levels acceptable by the recorder.
• Two input signal are applied to the two channels of X input & Y input.
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Prabhu Mike
X – Y RECORDER
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Prabhu Mike
Applications
o The X-Y recorders are used in laboratories and industrial process control. Some of the uses are listed.
o Speed – Torque characteristics of motor.o Lift – Drag wind tunnel rest.o Regulation curves of power supplies.o Plotting stress – strain curves.o Hysterisis curves.
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Prabhu Mike
SINGLE PHASE ENERGY METER
• There are four main parts of the operating mechanism in a energy meter. They are
(1) Driving system (2) Moving system (3) Braking system (4) Registering system
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Prabhu Mike
Driving system
• The driving system of the meter consists of two electromagnets. They are
1. Series magnet 2. shunt magnet• The electromagnets is made up of silicon steel
lamination. The coil of series magnet is excited by the load current. This coil is called current coil. The coil of shunt magnet is connected across the supply. This coil is called the pressure coil.
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Prabhu Mike
SINGLE PHASE ENERGY METER
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Prabhu Mike
Moving system
• This system consists of an aluminium disc mounted on spindle. This disc is positioned in the air gap between series & shunt magnets.
• The spindle top end is engaged in a bearing cup and the spindle rests and runs on a hardened steel pivot. The threaded portion on top of the spindle will engage a pinion of the energy recording mechanism.
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Prabhu Mike
Construction
• Braking system: The disc moves in the gap between the poles
& experiences an eddy current braking.• Registering (counting) mechanism: The function of a registering mechanism is
to record continuously a number which is proportional to the revolution made by the moving system and hence the energy in kWH.
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Prabhu Mike
Digital energy meter
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Prabhu Mike
MEGGER
• The megger is an instrument used for the measurement high resistance and insulation resistance.
• Construction: There are two pairs of permanent magnet,
one set for ohm meter side and the other for the generator. The moving coil consists of three coils namely.
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Prabhu Mike
Cont….
(a) control coil (b) deflecting coil (c) compensating coil• The unknown resistance is connected
between the terminals L & E (line & earth).• When the pointer indicate ‘0’ hence the
resistance is very low resistance value.
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Prabhu Mike
Megger
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Prabhu Mike
Thank you
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