Electrical Measuring Instruments

1
Electrical Measuring Instruments Chapter 2
Ammeters, Voltmeters, and Wattmeters Electrical
Systems Series 724.1
PowerPoint Masters
720724.1-02PP
2
724.1.02-01
Fig. 2-1. Three common symbols for ammeters
3
724.1.02-02
Fig. 2-2. Milliammeter with shunt
4
724.1.02-03
Fig. 2-3. Multirange milliammeter
5
724.1.02-04
Fig. 2-4. Make-then-break switch
6
724.1.02-05
Fig. 2-5. Breaking a circuit to connect an ammeter
7
724.1.02-06
Fig. 2-6. How to fry an ammeter!
8
724.1.02-07
Fig. 2-7. Selected placements of an ammeter
9
724.1.02-08
Fig. 2-8. Ammeter with four-diode rectifier
and a current transformer
10
724.1.02-09
Fig. 2-9. How a diode bridge works
11
724.1.02-10
Fig. 2-10. Output of a full-wave rectifier
12
724.1.02-11
Fig. 2-11. Simple half-wave rectifier meter
circuit with output signal
13
724.1.02-12
Fig. 2-12. Two-diode half-wave rectifier circuit
14
724.1.02-13
Fig. 2-13. A clamp-on meter (digital)
15
724.1.02-14
Fig. 2-14. Two types of clamp-on, multirange
ammeter circuits
16
724.1.02-15
Fig. 2-15. Looping the conductor through the
core multiplies meter reading
17
724.1.02-16
Fig. 2-16. Measuring motor current with
a clamp-on ammeter
18
724.1.02-17
Fig. 2-17. Single-range voltmeter
19
724.1.02-18
Fig. 2-18. Multirange voltmeter circuit
20
724.1.02-19
Fig. 2-19. Multirange ac voltmeter
21
724.1.02-20
Fig. 2-20. Representative voltmeter connections
22
724.1.02-21
Fig. 2-21. Reading voltage with a clamp meter
23
724.1.02-22
Fig. 2-22. Clamp-on ammeter/voltmeter circuit
24
724.1.02-23
Fig. 2-23. Electrodynamometer wattmeter