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HAND OUT ALAT UKUR LISTRIKCHAPTER 1

THE MEASUREMENT OF ELECTICAL

Electrical measurement instrument is a tools that used To determine electrical quantities of DC and AC such as voltage, current, resistance, power, work factors, and frequency, we use electrical measuring instruments.

.There is two kind of measurement systems:

1. measurement with analog system, Analog systems associated with information and analog data that showing from the appointment of an electronic scale appointment of an electronic scale.

2. measurement Digital systems related to information and digital data. The appointment of a discrete digital number is numeric and discontinuous pulses associated with time and displayed.

Multimeter is an electrical measure instrument can be used to measure some quantities, such as AC and DC voltage, DC and AC electrical current, the resistance

Single measurement instrument is a tools that can be use to measured only single quantities, for example to measured just current or just voltage only

There are several terms and definitions about electrical measurements :a. Measure instrument, is a device to determine value or magnitude from quantity or variable.

b. Accuracy, proximity gauges read the actual values of the variables measured.

c. Precision, the measurement results generated from the measurement process, or the degree to distinguish one measurement to another.

d. Sensitivity, the ratio from output signal or response measurement tool input changes or variables measured.

e. Resolution, the smallest change of value measurement that can be addressed by the measure instrument.

f. Error, the rate deviation from the true value variables measured.

Magnitude and Electrical SymbolsIn practical electrical quantities Now the SI system have made a list of quantities, units and symbols in the field of electricity and magnetism the international force.

Table 1.2. Magnitude and Electrical Symbols

Magnitude and symbolsName and symbolsEquation

Electric Current, IAmperA-

Electromotive Force, Evolt V-

Potential Electrical, VvoltV-

Resistance, RohmR = V/I

Electric Charge, QCoulomb,CQ = It

Capasitance, CFarad,FC = Q/V

Electric Field, E-V/mE = V/l

Electric flux density, D-C/m2D = Q/I2

Magnitude and symbolsName and symbolsEquation

Permittivity, -F/m = D/E

Magnetic Field, H-A/m Hdl = nI

Magnetic Flux, weberWb E =d/dt

Magnetic flux density, BteslaTB = /I2

Inductance, L, MhenryHM = /I

Permeability, -H/m = B/H

CHAPTER 2

SYSTEM AND PRINCIPLE OF ELECTRIC MEASUREMENT

Kind of measurement instrumentElectrical measurement instrument that usually used for measured including : kind of, sign mark, principle, used, the outhorization, and power used can be example by this table :Tabel 2. Measurement instrument exampleNokindSign

markWork principleUsedExampleRange of work and energyDaya

CurrentVoltageFrekuensi

12345678910

1Circular coreMElectromagnetic sytle between the magnetic field and currentDCAVO1,5 x 10-6 ~10210-2~10-3-small

2Moveable coilRThe combination of changer using semi conductor for the circular core to moveAC

AVOF5 x 10-4 ~10-11~103< 104small

3TermoMomenTThe combination of changer using termomomenand measured toolcircular core kind.AC

Efektif

DCAVW10-3 ~55x10-1 ~

1,5x102< 103small

4Iron core roundSElectromagnetic that work at iron core in the magnetic fieldAC

Efektif

DCAV10-2 ~

3x10210~103