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Meters > Meters > Flashcards

Meters Flashcards

1
Q

What device must be used with the D’Arsonval movement to enable the meter to read AC?

A

Rectifier

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2
Q

What is meant by “damping” a meter movement?

A

smoothing it out or oscillating

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3
Q

If you are using a multi-range meter and there is some doubt what the reading would be. What should you always do?

A

Read at the highest scale

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4
Q

What could happen if your leads are reversed when measuring DC?

A

It could damage the meter

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5
Q

What size of wire does a D’Arsonval movement have?

A

Very fine wires

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6
Q

What is the max current that the D’Arsonval movement can handle without damage?

A

50mA

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7
Q

What is it called when you get an incorrect reading because you are not looking at an analog meter straight on?

A

Parallax

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8
Q

What does a multimeter read?

A

AC DC volts
AC DC amps
Ohms

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9
Q

What is the purpose of a reset button in a multimeter?

A

To reset the internal circuit breaker

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10
Q

What must be used with the D’Arsonval movement in order to read voltage?

A

Large resistor

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11
Q

What is it called when a voltmeter changes the circuit that it is trying to read?

A

meter loading

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12
Q

Rule of thumb. How much bigger should the resistance in the meter be to the load it is measuring?

A

10 times

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13
Q

What should you check before connecting to a DC voltage source?

A

Polarity

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14
Q

Before using a meter or tester, you should check what first?

A

The scale

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15
Q

The common lead should always be what colour?

A

Black

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16
Q

A voltmeter is rated 10kohms/v and the range selector switch is on 50v. What is the resistance of the meter? (Rm)

A

500,000ohms

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17
Q

Meters are classified into 2 general groupings. What are they?

A

digital and analog

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18
Q

What is one commonly used type of meter movement called?

A

D’Arsonval

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19
Q

In what position should you store a meter if it does not have an off position?

A

highest AC volts setting

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20
Q

What is the resistor called that is in series with the meter movement coil in a voltmeter?

A

multiplier

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21
Q

Which meter would be more delicate? 1,000ohms/V or 10,000ohms/V

A

10,000

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22
Q

Does a voltmeter have high or low resistance?

A

high

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23
Q

Does an ammeter have high or low resistance?

A

low

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24
Q

How is the resistor connected in a voltmeter?

A

parallel

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25
Q

How is the resistor connected in an ammeter?

A

series

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26
Q

What tester has 2 insulated test leads, a neon bulb, and a bulb holder?

A

Neon voltage tester

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27
Q

Neon bulbs have high resistance and generally require at least _____ volts to initially switch on?

A

90 volts

28
Q

What is a more common name for a solenoid and plunger tester?

A

A wiggy

29
Q

What is the max amount of time that a solenoid and plunger should be connected to voltage sources?

A

20 seconds

30
Q

If the solenoid and plunger tester is vibrating, what does this mean?

A

It is measuring A/C

31
Q

When the electrode on the left side glows, the black test lead is?

A

negative

32
Q

when the electrode on the right side glows, the red test lead is?

A

negative

33
Q

What is the max amount of voltage that you can measure with a solenoid and plunger tester?

A

600v

34
Q

Which tester is used to check branch circuit receptacles?

A

an outlet analyzer

35
Q

In an ammeter, what is the resistor called to limit the current to the meter movement?

A

Shunt

36
Q

Where is the resistor located in the circuit?

A

parallel

37
Q

What must you do if you want to change the setting range on a multi-range ammeter?

A

turn it off

38
Q

What type of switch makes a new electrical connection before the previous one is turned off?

A

Make before break switch

39
Q

Which meter is more sensitive. 50microamps or 50milliamps?

A

50microamps

40
Q

What type of ohmmeter is the most common?

A

Series ohmmeter

41
Q

What is the fixed resistor for?

A

limiting current flow from exceeding ratings

42
Q

What is the rheostat for?

A

to compensate for low battery

43
Q

Which type of ohmmeter is used in a multimeter?

A

series

44
Q

What is the main advantage of the shunt type ohmmeter?

A

measures low resistances

45
Q

What is one disadvantage of the shunt ohmmeter?

A

the cell discharges when in use

46
Q

How can you tell the difference between series and shunt ohmmeters?

A

0 is on the left for shunt

0 is on the right for series

47
Q

Give two applications that we would use an ohmmeter for?

A

measuring resistance

continuity tests

48
Q

What does a zero reading indicate?

A

short circuit

49
Q

what does an infinity reading indicate?

A

an open

50
Q

What is a megger used for?

A

measuring high resistances

51
Q

What are normal voltages a megger can put out?

A

250,500,1000v DC

52
Q

Most hand crank meggers have a clutch, what is it for?

A

Clutch will slip if voltage rating exceeds

53
Q

List 4 precautions when using a megger

A
  • do not exceed rated values
  • high resistances only
  • do not touch leads
  • do not measure low voltage circuits
54
Q

In an ammeter, at what current must we use an external resistor?

A

25amps or more

55
Q

What would the external resistor of the ammeter be made out of?

A

copper

56
Q

What precautions should you take when testing circuits that contain capacitors?

A

discharge the capacitor if it holds a charge

57
Q

Why is an ohmmeter unsuitable for measuring insulation resistance?

A

the output voltage is too low

58
Q

If the leads of an ohmmeter are touching the pointer will read?

A

zero

59
Q

The AC clamp-on ammeter operates on the principle of which common device?

A

transformer

60
Q

In the ammeter the shunt is connected in___________ to the galvanometer?

A

parallel

61
Q

Why are larger shunts not placed within the case of the meter?

A

It would get too hot

62
Q

What is meant by meter loading?

A

It changes the values of the circuit

63
Q

Why do shunt resistors have low-temperature coefficient?

A

So they don’t change resistance when heated

64
Q

Neon type testers are usually not used on circuits less than?

A

90volts

65
Q

Sensitivity of Voltmeter?

A

50microamps to 50milliamps

66
Q

Sensitivity of ammeter?

A

5microamps to 50milliamps

Meters (3 decks)

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