Snmek 1

Anglicky v odbornch pedmtech"Support of teaching technical subjects in EnglishTutorial: Mechanic - electrician

Topic: Electric measurementthe 2nd. yearMeasuring devices 1Prepared by: Ing. Ji Smlek

Projekt Anglicky v odbornch pedmtech, CZ.1.07/1.3.09/04.0002je spolufinancovn Evropskm socilnm fondem a sttnm rozpotem esk republiky.

1Electrical measurements - a task:

Measuring Devices

For electrical measurements we find the size of electrical quantities such as voltage, current, power, resistance, inductance, capacity, frequency, etc.electrical measurements we verify or check properties electrical sources, appliances, telecommunication facilities, electrical grids and lines.

Slovnk:napt, proud, vkon, odpor, induknost, kapacitu, kmitoetelektrick zdroje, spotebi, sdlovac zazenelektrick stelektrick vedenFrazeologie:elektrickm menm zjiujeme velikost elektrotechnickch veliin elektrickm menm ovujeme nebo kontrolujeme vlastnosti

2Types of measurement:

Measuring devices - method

Measurement specifies the numeric value of the measured quantity Counting - determines the number of events of the same typeTesting determines whether the sample has the prescribed propertiesCalibration determines the deviation from the correct dataAdjustment (offset) - offset the MP in order to minimize data which was different from the correct valuesCalibration - the official procedure for verifying the accuracy

Slovnk:Men Potn - Zkouen Kalibrovn Justovn vyrovnn - Cejchovn Frazeologie:Men uruje selnou hodnotu men veliiny Potn - zjiuje poet udlost stejnho druhuZkouen uruje, zda m vzorek pedepsan vlastnostiKalibrovn zjiuje se odchylka od sprvnho dajeJustovn ( vyrovnn) - vyrovnv se MP, aby se daj co nejmn liil od sprvn hodnotyCejchovn - edn postup oven sprvnosti3Measuring methods

Measuring devices - method

Direct measuring methodsize of the measured values read directly on the appropriate measuring deviceSuch as voltage, current indirect measuring methodfrom other measured values, we calculate the size of the desired quantitiesSuch as resistance R=U/I, power P=U.I

Slovnk:pm mc metoda nepm mc metoda

Frazeologie:velikost namen veliiny peteme pmo na pslunm mcm pstrojiz jinch zmench hodnot musme vypotat velikost dan veliiny

4Measuring methods according to function:

Measuring devices - methods

deviation size of the measured quantity is determined by the size of the deflection of the measurement devices hands

zero measured quantity is subject to settlement (electrical balance), such as measuring bridge

Slovnk:metoda vchylkovmetoda nulov Frazeologie:velikost men veliiny se uruje zvelikosti vchylek ruky mcch pstroj zmen veliiny je podmnno vyrovnnm (elektrickm vyvenm), nap. mcho mstku5Measuring method according to the nature:

Measuring devices - methods

substitutionan unknown measured element is replaced with the element of known parametersParallel connection Measured currentcomparativeeffects of an unknown element are compared with the effects of an element with known parametersSeries connectionMeasured voltage

Slovnk:metoda substitunmetoda porovnvaczapojen do sriezapojen paraleln Frazeologie:neznm men prvek nahradme prvkem o znmch parametrechinky neznmho prvku porovnvme s inky prvku se znmmi parametrymme naptmme proud

6Error measuring:

Measuring devices - errorsCauses of errors according to the cause originimprecision of the measurement devicesimprecision of measuring methods - correctableinfluence of the environmentObserver reading Types of errors according to the manner of occurrencepermanent (continuous)- device, the methodrandom environment, human

Slovnk:Frazeologie:Piny chyb podle piny vznikunepesnost mcch pstrojnepesnost mcch metod korigovatelnvliv prostedten pozorovatelem Druhy chyb podle zpsobu vskytustl (soustavn) - pstroj, metodanahodil prosted, lovk

7Error measuring:

Measuring devices - errors

Nature of errors - deviationsDifference between the measured and actual values m = M - SDistributionAbsolute - in units of the measured quantityRelative - expressed in % m = m /M . 100Limit deviation from the nominal value %

Slovnk:Frazeologie:Podstata chyby rozdl namen a skuten hodnoty RozdlenAbsolutn - v jednotkch men veliinyRelativn vyjden v %Mezn odchylky od jmenovit hodnoty %Podstata chyby odchylkyrozdl namen a skuten hodnotyv jednotkch men veliinyRelativn vyjden v %

8Write what is the subject of electrical measurement Name some kinds of measurements Name the methods of measuring which you know Name the methods of measuring which you know according to the function Name the methods of measuring which you know according to the nature

Activities for students questions

Slovnk: Frazeologie:Napi co je pedmtem elektrickho men Vyjmenuj nkter druhy menVyjmenuj jak zn metody menVyjmenuj jak zn metody men podle funkceVyjmenuj jak zn metody men podle podstaty9Name the causes of errors Describe what constitutes an error Write a formula

Name the types of errors Write a formula Write a formula Write a formula

Activities for students questions

Slovnk:Frazeologie:Vyjmenuj piny chyb Popi co je podstatou chybynapi vzorecVyjmenuj druhy chyb 10Muk, J. Management ve vzdlvn dosplch. Praha: EUROLEX BOHEMIA, 2000. ISBN 80-7361-269-7.Operan program Vzdlvn pro konkurenceschopnost, ESF 2007 2013.Dostupn na: http://www.msmt.cz/eu/provadeci-dokument-k-op-vzdelavani-pro-konkurenceschopnostUebnice Elektrick men Ing. Pavel Vylegala, SE Ostrava, 2006Uebnice Elektrick men SNTL, 1981Elektrotechnika - Laboratorn cvien pro bakalsk studium - Doc. Ing. Milo Hammer, CSc.

Bibliography