Tutorial: Mechanic - electrician Topic: Electric measurement the 2nd. year Measuring devices 2 Prepared by: Ing. Jiří Smílek Projekt Anglicky v odborných.

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2 Tutorial: Mechanic - electrician Topic: Electric measurement the 2nd. year Measuring devices 2 Prepared by: Ing. Jiří Smílek Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

3 The measuring device consists: measuring system - the physical nature of the conversion values ​​for torque hand dials with scales control springs - directive (control) torque damping The measuring set consists: measuring devices bridges auxiliary equipment

4 Names of devices according to the measured quantities : voltage - voltmeter current - ammeter resistance - an ohmmeter power - wattmeter frequency - frequency meters power factor - (cosφ) - phase meters VAΩW Hz cos

5 The names of sets according to the measured variables : Resistance - Wheatstone bridge Inductance - Maxwell-Wien bridge

6 Types of measuring systems : with a rotating magnet – 1 magnetoelectric – 2 electromagnetic – 4 electrodynamic – 5 ferodynamic - (electrodynamic with iron) – 6 Induction – 7 Thermal – 8 electrostatic – 9 Resonance – 10 magnetoelectric with rectifier – 11 magnetoelectric with thermocouple - 12

7 Types of measurement device hands : a)blade, filiform - accurate, laboratory instruments b)lanceolate - Panel Meters c)Reed - switchboard apparatus

8 Types of rotating storage with handle : cylindrical storage very low friction, impact is easily damaged. pivot storage larger friction than the cylindrical bearing but mechanically robust.

9 Types of scales of measuring devices : uniform Uneven with suppressed zero

10 Types of damping - damping is used to stabilize the displacement hands a)magnetic b)air

11  Name what constitutes a measuring device:  Name what constitutes a measurement set: Fill in the following table: Measured quantityMeasurement device voltage Phase meter current resistance wattmeter frequency

12  Name the 4 measuring systems and draw their symbols:  Name and draw the types of scales of measuring apparatus:  Name the types of damping

13  Mužík, J. Management ve vzdělávání dospělých. Praha: EUROLEX BOHEMIA, 2000. ISBN 80-7361-269-7.  Operační program Vzdělávání pro konkurenceschopnost, ESF 2007 – 2013.  Dostupné na: http://www.msmt.cz/eu/provadeci-dokument-k-op-vzdelavani-pro- konkurenceschopnosthttp://www.msmt.cz/eu/provadeci-dokument-k-op-vzdelavani-pro- konkurenceschopnost  Učebnice Elektrická měření – Ing. Pavel Vylegala, SŠE Ostrava, 2006  Učebnice Elektrické měření – SNTL, 1981  Elektrotechnika - Laboratorní cvičení pro bakalářské studium - Doc. Ing. Miloš Hammer, CSc.