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E003B meters

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E003B meters

1. 1. What do we use to measure these electrical quantities ??<br />Revision02<br />1<br />Class discussion<br />
2. 2. Measuring circuit parameters <br />Ensure correct polarity<br />Check scale is correct<br />Voltmeters go ACROSS the component<br />2<br />Revision02<br />Using separate meters<br />+<br />-<br />
3. 3. Ammeters<br />Ammeters go IN the circuit<br />Check the correct scale<br />Ensure correct polarity<br />3<br />Revision02<br />
4. 4. Measuring the resistance of a component<br />NEVER attempt to measure resistance on a live circuit!<br />4<br />Revision02<br />
5. 5. Clip-on ammeter<br />CAUTION live circuit<br />one conductor only<br />check scale<br />check if AC or DC<br />induction meter on AC only<br />5<br />Revision02<br />
6. 6. Revision02<br />6<br />                    <br />Meters<br />Typical Clamp Meters<br />Attachment for multimeter<br />
7. 7. 2 basic types<br />moving coil (DC coils on AC use diode for the DC)<br />moving iron (AC & DC)<br />Parallax error<br />Some meters have a mirror scale to reduce reading errors.<br />Revision02<br />7<br />Analogue meters<br />
8. 8. Low value resistance measurement<br />eg; () Bridge instruments <br />High Value resistance measurements<br />eg; (M) insulation resistance testers<br />Revision02<br />8<br />Continuity and resistance testers<br />
9. 9. Do not measure voltage accurately.<br />Neon indicators need about 90V before they work<br />You have no guarantee that there is zero volts.<br />Revision02<br />9<br />Circuit indicators<br />