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Electronics > Analog Meters > Flashcards

Analog Meters Flashcards

0
Q

Where is the zero adjust screw on a meter

A

Front

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1
Q

If there is no off switch where should you store the meter

A

At the highest AC volts setting

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2
Q

The purpose for a reset button on the multimeters is

A

Reset the internal circuit breaker

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3
Q

The function of the 0 ohms just knob is for

A

Compensate for voltage variations in the internal battery

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4
Q

The current for full-scale deflection in meter movement rarely exceeds

A

50 mA

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5
Q

What indication will result with a break in the test lead of any voltage tester

A

0 V

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6
Q

Neon type testers usually not used on circuits less than

A

90 V

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7
Q

What type of tester will identify specific wiring faults on 120 V branch receptacles

A

Outlet tester

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8
Q

When a solenoid and plunger voltage tester is connected to a voltage source on what does the position of the indicating disk depend

A

Strength of field which is proportionate to voltage

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9
Q

What neon signal identifies that the voltage under test is DC

A

Only one neon lamp lights up

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10
Q

If a voltage tester disc vibrates

A

An AC voltage is being tested

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11
Q

Which category of voltages is the solenoid and plunger tester ideal for

A

Nominal voltages

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12
Q

How long can a solenoid and plunger tester be connected to voltage

A

20 seconds

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13
Q

What is the maximum nominal voltage value of the solenoid and plunger voltage tester can be used on

A

600 V

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14
Q

A voltmeter sensitivity and the solenoid and plunger voltage tester sensitivity

A

Are the same

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15
Q

Voltmeters are connected in

A

Parallel

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16
Q

What do you do before testing a dc voltage?

A

Check leads have correct polarity.

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17
Q

Why keep meters dry and clean

A

So to not cause flashover

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18
Q

Meter leads that are damaged

A

Should be replaced

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19
Q

Why can testing a battery be a safety hazard

A

Cause short circuit and explode

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20
Q

How is a shunt connected in relation to the galvanometer?

A

Parallel

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21
Q

Shunt device has a very what resistance?

A

Low

22
Q

Why are shunts made of materials with low temp coefficient?

A

Ensure minimal resistance change

23
Q

Full scale deflection current in a meter movement can be as low as

A

5 micro amps

24
Q

Why do you have a make before break switch in ammeter?

A

Prevent excess current flow in movement

25
Q

Full scale current ratings in ammeter vary from

A

5 micro amps to 50 milliamps

26
Q

Better sensitivity is

A

A lower amp rating

27
Q

What kind of circuit is most affected by using an ammeter with poor sensitivity?

A

Love voltage/low power

28
Q

Ideal theoretical resistance of ammeter is

A

Zero

29
Q

Why not use larger shunts in the meter

A

Too big

Too much heat

30
Q

Manganin has

A

Low temp coefficient

31
Q

Ac clamp ammeter uses the principle of

A

Transformer

32
Q

Conductor of 2.2A is looped four times the scale should be

A

2.2x4=8.8

33
Q

Disadvantage of tong tester

A

Only one range

34
Q

Shunt resistor

A

Low mid scale

35
Q

Ohm meters all have what kind of scales

A

Non-linear

36
Q

2 types of ohm meters

A

Series

Shunt

37
Q

Series ohm meter high resistance values on the

A

Left

38
Q

In the shunt ohm meter the high resistance values are on the

A

Right

39
Q

What ohm meter used for low resistance?

A

Shunt

40
Q

Disadvantages of shunt ohm meter

A

Power discharges as soon as meter is turned on

41
Q

What ohm meter in multimeter?

A

Series

42
Q

What function rheostat in ohm meter

A

Compensate for battery

43
Q

Never connect an ohm meter to

A

A live circuit

44
Q

2 uses for ohm meter

A

Continuity

Resistance

45
Q

Infinity reading on an ohm meter means

A

Open circuit

46
Q

If the ohm meter leads are separate you will get a reading of

A

Infinity

47
Q

If the ohm meter leads are touching you will get a

A

Zero reading

48
Q

Megger is used for testing

A

High resistance

Insulation resistance

49
Q

Typical Megger output

A

100-1000V

50
Q

3 things when connecting ohm meter

A

Make sure not energized
Zero meter
Isolate at least one side

51
Q

Why does polarity of the leads of a multimeter reverse when used for resistance?

A

Meter changes from a load to a supply

52
Q

When testing capacitors

A

Discharge them

53
Q

Precautions with a Megger

A

Don’t connect to energized circuit
Don’t use in low voltage circuits
Charges can be built up in Megger

Electronics (1 decks)

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