2. Tutorial: Mechanic - electrician Topic: Basics of electrical engineering the 2nd. year Measuring system 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.  Electromagnetic system – rotary iron Construction: Inside the coils are placed two blades fixed moving The moving blade is attached to a handle

4.  Principal function: Mutual stresses exerted of two ferromagnetic materials in a magnetic field When the current passes through the coil it creates a magnetic field that repels the blades from each other  Application: ◦ Measures DC and AC currents and voltages

5.  Properties: Simplicity Operationally safe construction Large short-term overload Measures DC and AC Easily extend the range with an inverter - MTP/MTN Mark:

6.  Electrodynamic system Construction: Inside the solid core coil is positioned a moving coil The moving coil is attached to a handle The fixed coil is divided into two parts – a larger homogenous field

7.  Principal function: Mutual electrodynamic stresses of the currents of both coils The magnetic field coil creates motion torque M p = k I 1 I 2  Application: ◦ Measuring current and voltage – DC and AC ◦ Performance measurement

8.  Properties: Small sensitivity Large consumption The influence of foreign fields – magnetic shielding Mark:

9.  Ferrodynamic system Construction: Eletrodynamic system with a ferromagnetic core coil of sheet metal of silicon and steel.

10.  Principal function: ◦ Same as electrodynamic system ◦ Ferromagnetic core increases sensitivity  Application: ◦ Measurement of AC power

11.  Properties: Greater sensitivity Less consumption Measures power output <1W Mark:

12.  Name the well-known measuring systems ◦  Describe the construction 1. system  Describe the principal function 1. system  Draw the mark on the measuring device 1. system  Name the applications of the system 1. system

13.  Describe the construction 2. system  Describe the principal function 2. system  Draw the mark on the measuring device 2. system  Name the applications of the system 2. system  Compare systems 2 and 3

14.  Mužík, J. Management ve vzdělávání dospělých. Praha: EUROLEX BOHEMIA, 2000. ISBN 80-7361-269-7.  Operační program Vzdělávání pro konkurenceschopnost, ESF 2007 – 2013.  Available at: http://www.msmt.cz/eu/provadeci-dokument-k-op-vzdelavani-pro- konkurenceschopnosthttp://www.msmt.cz/eu/provadeci-dokument-k-op-vzdelavani-pro- konkurenceschopnost  Electrical Measurement textbooks– Ing. Pavel Vylegala SŠE Ostrava, 2006  Electrical Measurement textbooks – SNTL, 1981