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ELX > C4 LT6 > Flashcards

C4 LT6 Flashcards

1
Q

What does a low battery symbol indicate to the user?

A

Internal battery needs replacement.

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2
Q

How is analogue meter accuracy usually expressed?

A

Percentage of full-scale deflection

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3
Q

What affects the accuracy of an analogue meter the most?

A

Value of voltage just below the scale

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4
Q

What can cause false readings to be displayed on a DMM?

A

Impedance

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5
Q

What does a negative or minus sign to the left of the reading indicate with autopolarity feature?

A

Lead polarity is reversed for DC measurements.

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6
Q

How is DMM’s accuracy expressed?

A

Percentage of the actual meter reading

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7
Q

What is the accuracy of a DMM with a stated accuracy of (1 % + 2), measuring a 20 V voltage?

A

19.6 - 20.4

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8
Q

What may occur when conductors for a de-energized circuit are run in a conduit with energized conductors?

A

Capacitive coupling

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9
Q

What does OL indicate on a digital multimeter?

A

Overload / Range too low for measurement

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10
Q

What ranges are available for measurement on a DMM?

A

Voltage (AC and DC), current (AC and DC), resistance

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11
Q

What special test positions might a digital multimeter have?

A

Beeper for continuity, diode testing feature

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12
Q

What does the HOLD function in a DMM allow?

A

Save the measurement to be read later

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13
Q

What indicators are present on the bar graph?

A

Polarity and overload

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14
Q

What does the MIN MAX mode in some DMMs do?

A

Capture and store highest and lowest values

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15
Q

What can improve the meter resolution?

A

Reducing range setting

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16
Q

How can the DMM range setting be adjusted to increase resolution?

A

Closer but higher than expected voltage value

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17
Q

In a 3-digit DMM with a meter range of 600V, what is the resolution?

A

1V

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18
Q

What is the resolution in a 3-digit DMM with a meter range of 200V?

A

0.1V

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19
Q

What could an analogue meter that is 1 percent accurate on the full-scale be out by on a 100-volt scale?

A

1 volt or 5 percent

20
Q

What issues can the recording mode be useful for troubleshooting in a circuit?

A

Low-voltage, high-voltage surge, circuit overloading

21
Q

What does autoranging do?

A

Automatically selects measurement range.

22
Q

What is the resolution in a 3-digit DMM with a meter range of 20V?

A

0.01V

23
Q

How does a DMM with high impedance affect circuit measurements?

A

No loading effect

24
Q

What happens to the display on a DMM when a high impedance meter is connected to a de-energized circuit?

A

Indicate some voltage present

25
Q

What is the purpose of manual ranging?

A

Lock into a specific range for repetitive measurements.

26
Q

In a 3-digit DMM with a meter range of 2V, what is the resolution?

A

0.001V

27
Q

How does a digital multimeter measure accuracy?

A

Percentage of actual signal + counts

28
Q

What is the purpose of a bar graph on a digital multimeter?

A

Indicate changes and trends in a circuit

29
Q

What is the resolution of a DMM with a 3-digit or 2000-count display set at the 200 volt range?

A

0.1

30
Q

How are the units of measurement determined on a digital multimeter?

A

According to the range switch setting

31
Q

What is the accuracy of the same DMM measuring a 20 V voltage, but set on the 20-volt scale?

A

19.78 - 20.22

32
Q

What do you need to do to measure a higher voltage value on a DMM?

A

Switch the range selector switch to a higher voltage range

33
Q

Why is the bar graph reading updated faster than the numerical reading on a DMM?

A

Easier for the eye to detect.

34
Q

Why is it important to pay attention when reading the display of a DMM?

A

To avoid misinterpretation errors

35
Q

How does an analogue meter indicate problems?

A

Movement of its needle

36
Q

How can misinterpretation of a signal value occur on a DMM?

A

Misreading unit icons

37
Q

How is the resolution of a DMM determined?

A

By display count and voltage level

38
Q

What is the purpose of the RANGE button on digital multimeters?

A

Manually change range

39
Q

How does the bar graph on a DMM react?

A

Like the needle on an analog meter.

40
Q

Why is the HOLD function helpful?

A

Measurement fluctuates rapidly or reading in awkward place

41
Q

What can a bar graph’s quick response reveal?

A

Loose connections or contact bounce

42
Q

What can DMMs display when test leads are connected to a circuit that is not energized?

A

Ghost voltages

43
Q

What is a manual range mode type?

A

A DMM that allows the selection of a specific measurement range

44
Q

What will be displayed on the DMM if the voltage exceeds the maximum value of the set range?

A

OL (overload)

45
Q

What does the autorange mode do on a multimeter?

A

Changes to higher range with overload

ELX (55 decks)

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