Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

A1 Lt A-6 > Digital Multimeter Functions > Flashcards

Digital Multimeter Functions Flashcards

1
Q

Witch DMM function is used to measure resistance

A

Ohmmeter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Which DMM function is used to measure current flow in an electrical circuit ?

A

Ammeter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the impedance value or most digital voltmeters

A

10 megohms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which meters are more commonly used in electrical trade

A

Digital

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which meters are more accurate analog or digital

A

Digital

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the abbreviation DMM short for

A

Digital multimeter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which meter is used to take current measurements without opening the circuit

A

Clamp on ammeters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is meter loading

A

The effect a meter has on a circuit

(Due to the meter changing the circuit by lowering the total resistance)

Witch lowers the voltage to

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

When working with electronic ballast, VSD or computer what do you use (true RMS) or (average responding DDM?)

A

You use true RMS because these items have non sinusoidal wave forms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Witch DMM setting would be used to measure the out put of an
Alternator_______
Rectifier_________

A

Alternator = AC volts
Rectifier = DC volts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

List to advantage of a clamp on ammiter
Over a DMM

A

They have a higher amperage rating
You don’t have to open the circuit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Witch meter function would be selected to provide quick and easy testing of weather a fuse is open or has a complete path through it

A

Continuity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

DMM amperage rating is what

A

10 amps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

List three causes of insulation deterioration

A

1, Mechanical damage
2, Heat
3, Oil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

List two applications where maggers are used

A

Routine checks
Checking wires in conduit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

List three types of electrical equipment that could have their insulation resistance tested

A

1, cables
2, motors
3, transformers

17
Q

What should always be done with a conductor before and after megger testing the conductor

A

1, Turn off power
2, discharge

18
Q

What is the minimum reading expected when meggering a motor conductor

A

1 megohm or higher

19
Q

What CSA standard covers workplace electrical safety

A

CSA standard Z462-08

20
Q

What category of DMM is required for testing where fault current are very high

A

Category IV

21
Q

The category rating of Test leads of a DMM must meet or exceeded the category rating of the DMM

True or false

A

True

22
Q

What must be done before using a DMM

A

Test on a known circuit to ensure that the DMM is working properly 

23
Q

Once you are finished using a DMM, you can throw it in to your toolbox
True or false

A

False

24
Q

Metre tests leads can be replaced with the cheapest leads available
True or false

A

False

25
Q

If a metre fuse is blown, it can be replaced with any fuse
True or false

A

False

26
Q

Ideal metres must be stored in a dark room
True or false

A

False
Must be in a tempture controlled area

27
Q

What is the window on the DMM called where the reading appears

A

Display

28
Q

The bar graph has a polarity indicator on the left
True or false

A

True

29
Q

Identify one cause of false readings on a DMM on a de energize circuit

A

Capacitive coupling

30
Q

False readings are normally none as

A

Ghost or stray voltage

31
Q

What must be done to get an accurate rating of OL appears on a display when the DMM is on manual range

A

Switch to a higher range

32
Q

The bar graph on a DMM reacts like the needle on an analogue metre
True or false

A

True

33
Q

How does an analog meter work

A

It draws current from the circuit being measured to deflect the coil and pointer of the meter movement.

The amount of current drawn dippends on the ohms per volt of the meter

34
Q

How do digital meters work

A

They use an analogy / to / digital converter to display a reading

35
Q

Which feature on a DMM would best be used to detect rapidly changing signal such as contact contact or micro switch

A

Bar graph

A1 Lt A-6 (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions