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ELX > C4 LT4 > Flashcards

C4 LT4 Flashcards

1
Q

What is an analogue-to-digital converter?

A

Converts analogue voltage into a digital signal

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2
Q

What are some causes of transient voltages?

A

Lightning strikes, unfiltered equipment, power being switched on and off

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3
Q

Why is it important to use proper test leads when using test equipment?

A

Ensure safety

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4
Q

What is the recommended procedure for connecting the leads of a DMM to a circuit or component?

A

Black lead to negative, red lead to positive. Black lead connected first.

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5
Q

Where do you plug the black test lead when measuring DC voltage with a DMM?

A

Jack labelled ‘COM’

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6
Q

What should be used if the current is higher than what the meter is rated for?

A

AC clamp-on ammeter

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7
Q

When should you use a DC clamp-on ammeter?

A

current higher than meter rating

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8
Q

Why should you never connect a DMM set for ohms to an energized circuit?

A

Damage the meter

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9
Q

What type of display do digital meters have?

A

Numerical digits

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10
Q

What do the categories in a DMM classify?

A

Application and equipment usage for testing voltages up to 1000 volts

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11
Q

Where is the category rating usually stamped on?

A

Test probe

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12
Q

What does protective clothing made of durable flame-resistant material provide protection from?

A

Hot and sharp objects

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13
Q

Where do you plug the red test lead when measuring DC voltage with a DMM?

A

Jack labelled ‘V’

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14
Q

What should you do before testing a component with a DMM set to resistance?

A

Remove or isolate

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15
Q

What are panel types of meters used for?

A

Displaying electrical measurements

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16
Q

What does a category-rated meter provide protection from?

A

Overcurrent faults

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17
Q

What should you do if a test lead is damaged?

A

Replace with new one with same category rating

18
Q

What is required to protect from falling objects, impact, and electrical shock?

A

Hard hat or protective helmet

19
Q

Where is the bench type meter commonly used?

A

In lab areas and on workbenches

20
Q

What is the hand-held type of meters used for?

A

Troubleshooting and field measurements

21
Q

What precaution should be taken when working with circuits?

A

Assume energized until confirmed de-energized

22
Q

What organization sets the standards for electrical measurement category ratings for test tools?

A

IEC (International Electrotechnical Commission)

23
Q

What is a transient voltage?

A

Temporary voltage spike in an electrical circuit

24
Q

What should be the relationship between the category rating of test leads and the tester?

A

Equal or exceeds

25
Q

What should be checked for on test leads?

A

Wear and abuse

26
Q

What protective equipment should be worn when working with circuits?

A

Appropriate gear for area

27
Q

What is the advantage of digital meters over analogue meters?

A

Faster and easier to read

28
Q

Where is Category I equipment used?

A

Protected electronic equipment not directly connected to mains

29
Q

What may also be stamped on a test lead?

A

Amperage rating

30
Q

Should correct polarity be ensured when connecting test leads to an AC voltage waveform?

A

No

31
Q

Where are analogue-to-digital converters used?

A

Digital meters

32
Q

Where is Category II equipment used?

A

Single-phase receptacle-connected loads like appliances and portable tools

33
Q

Should correct polarity be ensured when connecting test leads to a DC voltage?

A

Yes

34
Q

What should be done if a negative sign is displayed in the DMM’s display window during measurements?

A

Reverse the meter leads.

35
Q

What should you do first when measuring DC voltage with a DMM?

A

Set function switch to DC volts

36
Q

What should you do before plugging in the test leads when measuring AC amps?

A

Set to highest current range

37
Q

Why is it important not to change the function switch position while the circuit is energized?

A

To avoid damage or injury

38
Q

How should the ammeter be connected in the circuit for measurement?

A

In series

39
Q

To avoid damaging the meter, what should you do if you are done with current measurements?

A

Turn function selector switch to OFF position

40
Q

What are the steps to connect a DC clamp-on ammeter?

A

turn off power, open circuit, connect leads

41
Q

Where should you plug the black lead when using a DMM for resistance?

A

Common jack

42
Q

Where should you plug the red lead when using a DMM for resistance?

A

Resistance jack (N)

ELX (55 decks)

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