NCATT DC/AC Measurement - Level 2b

Question 1

Define Multimeter

Answer 1

Multimeter—Multi-function meter used to test current values, voltage values, or ohmic values (resistance). With the flip of a switch, a multimeter can be set up as an ammeter, voltmeter, or ohmmeter. Displays on a multimeter are provided in both analog and digital format. Use a multimeter whenever possible.

Question 2

Define Ammeter

Answer 2

Ammeters—Electrical testing instrument used to measure the amount of current flowing through a load. Values are given in amps. Some ammeters measure milliamps and microamps.

Question 3

Define Voltmeter

Answer 3

Voltmeters—Electrical testing instrument used to measure electrical voltage across components. Values are given in volts. Use a voltmeter for measurements and calculations to find a probable defect.

Question 4

Define Ohmmeter

Answer 4

Ohmmeters—Electrical testing instrument used to measure resistance in a circuit or component. Values are given in ohms. An ohmmeter provides an effective and quick way to test the condition of a switch.

Question 5

Define Oscilloscopes

Answer 5

Oscilloscopes—Electronic test instrument that displays the waveforms of electrical signals. Oscilloscopes measure voltages (AC peak-to-peak values), measure time to determine frequencies, and display phase relationships (comparisons of waveforms in time) to identify equipment malfunctions.