Electrical engineering labs modernization
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The document discusses reasons why engineering college labs still use old analog meters rather than digital meters. It argues that digital meters are more accurate, have higher resolution, are smaller in size, and have higher internal impedance. However, it acknowledges that a few experiments could still use analog meters for educational purposes. Overall, it advocates updating lab equipment with modern digital meters and automated control systems to improve learning outcomes for students.
Electrical engineering labs modernization
- 1. BY JABEZ WINSTON.C(11EE16) 3rd year EEE jω©2013
- 2. Measuring Connecting Power supply Miscellaneous jω©2013
- 3. Why do engineering college labs use old MC and MI instruments? Why not digital meters? jω©2013
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- 5. First of all , you cannot be remain outdated.Second thing is you measure only voltage/current/power with those instruments and hence there is no scope of learning lot from them .Just for the sake of academic purpose , one or two experiments can be done using such instruments.We are in age where things are shrinking.Hence there is no point in having bulky instruments anymore. jω©2013
- 6. Less accuracy Poor resolution Can be easily damaged if mishandled High cost Large size Internal impedance is low in case of voltmeter. For example , a (0-30V) MC voltmeter’s internal resistance is only 30kΩ which increases the chance of loading effect. jω©2013
- 7. Highly accurate High resolution Low cost Auto-ranging feature in some multimeters Smaller size High internal impedance(commonly 1MΩ,occasionally 10M Ω and sometimes even 40MΩ) jω©2013
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- 10. Autorange multimeters Pocket size DMM Capable of measuring frequency,capacitance,AC current,etc., jω©2013
- 11. Clamp meter capable of measuring current upto 1000 A Manual ranging multimeter jω©2013
- 12. The way we connect measuring equipments,auxillary equipments,device or machine should change. jω©2013
- 13. The problem of many instruments!!2 voltmeters,6 ammeters!! jω©2013
- 14. Typical Machines Lab Table jω©2013
- 15. A voltmeter( preferably digital) can be permanently connected across R and Y(Both supply and machine) R and N(Both supply and machine) A1 and A2 (+) and (-) A ammeter can be connected with (+),R,A1,F1 terminals The obvious reason is that it is frequently required to measure armature voltage , field current , line voltage , phase voltage , supply voltage jω©2013
- 16. This would be better… jω©2013
- 18. Time is saved More complicated experiments can be carried out Monotonous connecting work is minimized and hence learning is enhanced jω©2013
- 19. Why not use 100V or 120V AC and 100V DC for experimental purposes? jω©2013
- 20. Lower voltages are safer The supply voltage in USA is 120V 60Hz The power supply is Japan is 100V(50Hz is Eastern Japan and 60Hz in Western Japan) If phase voltage is 115V,then line voltage is just 200V If supply voltages are lower,you can experiment more with less risk If supply voltages are higher,the only less experimenting is possible jω©2013
- 21. How about working with smaller motors and generators like this Rated voltage: 115V Rated current:2.5 A Power: ½ HP….. We could save the scarce power like this!!!Starting and stopping the motor would be easy. How about using power electronic devices to control voltage, current instead of old 3 point starter , autotransformer , rotor resistance starter??? jω©2013
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