Music 9 - 4th quarter - Vocal Music of the Romantic Period.pptx
E003B meters
1. What do we use to measure these electrical quantities ?? Revision02 1 Class discussion
2. Measuring circuit parameters Ensure correct polarity Check scale is correct Voltmeters go ACROSS the component 2 Revision02 Using separate meters + -
3. Ammeters Ammeters go IN the circuit Check the correct scale Ensure correct polarity 3 Revision02
4. Measuring the resistance of a component NEVER attempt to measure resistance on a live circuit! 4 Revision02
5. Clip-on ammeter CAUTION live circuit one conductor only check scale check if AC or DC induction meter on AC only 5 Revision02
6. Revision02 6 Meters Typical Clamp Meters Attachment for multimeter
7. 2 basic types moving coil (DC coils on AC use diode for the DC) moving iron (AC & DC) Parallax error Some meters have a mirror scale to reduce reading errors. Revision02 7 Analogue meters
8. Low value resistance measurement eg; () Bridge instruments High Value resistance measurements eg; (M) insulation resistance testers Revision02 8 Continuity and resistance testers
9. Do not measure voltage accurately. Neon indicators need about 90V before they work You have no guarantee that there is zero volts. Revision02 9 Circuit indicators