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ELX > C4 LT1 > Flashcards

C4 LT1 Flashcards

1
Q

How do digital multimeters measure the waveforms under test?

A

True RMS or average responding methods

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2
Q

What are digital voltmeters commonly used for?

A

Voltage measurements

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3
Q

What is a DC voltage source?

A

Unidirectional current flow

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4
Q

What is the purpose of a diode?

A

Allows current to flow in one direction only

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5
Q

In what configuration is the meter placed with the device being measured?

A

In parallel

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6
Q

How is DC voltage usually supplied?

A

From a battery or power supply

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7
Q

What voltage is approximately for most silicon diodes?

A

0.7volts

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8
Q

What does a digital multimeter with autoranging feature do?

A

Automatically select the best accuracy and resolution range

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9
Q

What creates AC voltage?

A

An Alternator at a hydroelectric plant

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10
Q

What is a rectifier used for?

A

Convert AC to DC

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11
Q

What does the continuity function of a DMM do ?

A

Verifys circuit completion

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12
Q

How can the autorange feature on a DMM be changed to manual range?

A

Using the range button

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13
Q

What is the AC voltage function used for?

A

Measuring changing voltage

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14
Q

How can DC voltage be produced?

A

Electromagnetism, chemicals, heat, solar panels

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15
Q

How can the current be measured with a standard DMM?

A

Interrupt circuit, connect in series

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16
Q

What does the function control switch on a digital multimeter do?

A

Selects the electrical quantity to be measured

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17
Q

What can a DMM set for the DC voltage function be used to test?

A

Battery banks, DC motors, DC generators

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18
Q

What type of current can clamp-on ammeters measure?

A

Alternating current

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19
Q

What is the difference between true RMS and average responding meters?

A

Integration circuit vs. simple circuit

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20
Q

What is the typical input impedance of most digital meters?

A

10 megohms

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21
Q

What does a digital ammeter measure?

A

Current in an electrical circuit

22
Q

What is the relationship between induced voltage and the strength of the magnetic field?

A

Proportional

23
Q

How can you determine if a DMM is a true RMS meter?

A

Check the manufacturer’s specifications

24
Q

Why does a voltmeter with low resistance compared to the circuit give a false reading?

A

Changes the circuit by lowering resistance

25
Q

What causes current to flow through a circuit?

A

Power source connected to a device

26
Q

What can a clamp-on meter measure?

A

AC and DC voltages, resistance

27
Q

What is the term for the effect a meter has on the circuit by increasing current flow?

A

Meter loading

28
Q

What is current?

A

Flow of electrons when voltage is applied

29
Q

What are the different types of alternators?

A

Steam-powered and wind-powered

30
Q

What is current measured in?

A

Amperes or amps

31
Q

What does AC voltage do?

A

Changes in magnitude and polarity

32
Q

What can most DMMs measure in terms of current?

A

Micro-amp range to 10 amps

33
Q

Are clamp-on current probe accessories available for both AC and DC currents?

A

Yes

34
Q

What is the voltage produced by a DMM in diode test mode?

A

2.5 volts

35
Q

What can the continuity function be used for in troubleshooting?

A

Test components like fuses and switches

36
Q

How does a DMM indicate continuity?

A

Audible signal or tone

37
Q

What is the maximum current measurement for most DMMs?

A

10 amperes

38
Q

What will the display indicate on a DMM when the measurement value exceeds the selected range?

A

OL (overload)

39
Q

What does a true RMS meter use to compute the RMS value of the waveform under test?

A

Integrated circuit

40
Q

What type of circuits require a true RMS DMM for accurate measurement?

A

Lighting circuits with electronic ballasts, circuits with variable-speed drives, and computers

41
Q

What does input impedance limit when taking measurements with a meter?

A

Current drawn by the meter

42
Q

What effect can occur if a voltmeter has a resistance that is too low in comparison to the circuit?

A

False reading due to meter loading

43
Q

Why are current measurements taken?

A

To ensure circuit is not overloaded

44
Q

How do clamp-on meters measure current?

A

Current transformer

45
Q

Where is the AC voltage function commonly used?

A

Testing and troubleshooting AC circuits

46
Q

What are the types of digital ammeters?

A

Panel mount, bench, clamp types, DMMs

47
Q

Where is the core material of the current transformer located?

A

Jaw of the meter

48
Q

What are clamp-on current probe accessories used for?

A

Measure higher current values and safely take current readings without opening a circuit.

49
Q

What induces voltage in the current transformer?

A

Changing magnetic field

50
Q

How do clamp-on ammeters measure current?

A

Hall effect generator principle

ELX (55 decks)

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