meters

Question 1

dmm

Answer 1

digital multimeter

Question 2

2 kinds of digital multimeters

Answer 2

root mean squared ( rms)

average responding

Question 3

what is the impedance value of most multimeters

Answer 3

10 megaohms

Question 4

when do you use rms meter?

Answer 4

electronic ballasts, variable speed drives, and computers

Question 5

when do you use a ac voltmeter?

Answer 5

recepticals , switches and other ac circuits

Question 6

what is a rectifier

Answer 6

device that converts ac to dc current

Question 7

when do you use a dc voltmeter

Answer 7

when voltage is supplied from a battery or power supply or from a rectifier

Question 8

what do ammeters measure

Answer 8

amps

Question 9

what ado ohmmeters measure

Answer 9

resistance

Question 10

what is function requires the built in battery? what does it measure?

Answer 10

the ohmmeter function, resistance

Question 11

what function tells you quickly and if a circuit is complete

Answer 11

continuity function

Question 12

what are the benefits of a clamp on multimeters?

Answer 12

does not require the circuit to be interrupted or de -energized
able to measure an excess of 10 amps

Question 13

what is meter loading? what does it do?

Answer 13

false reading of the meter changing the resistance of the circuit, it lowers the voltage reading

Question 14

what does a wattmeter meauser

Answer 14

power ( watts )

Question 14

what does a wattmeter meause

Answer 14

power ( watts )

Question 15

basically a wattmeter is what?

Answer 15

an ammeter and a voltmeter combined

Question 16

steps for using a wattmeter

Answer 16

ppe
check leads and meter on known source
de-energize cct
connect the current jacks in series
connect the volatage jacks in parrallel
energize and take the reading
de-energize and remove meter

Question 17

at what amprage does a wattmeter not work well under?

Answer 17

3 amps

Question 18

what does a megger do?

Answer 18

tests insulation resistance of motors, transformers, circuit wiring, cables and other electrical devices

Question 19

what causes insulation deterioration?

Answer 19

mechanical damage, fault current, excessive heat, oil, moisture and voltage stress

Question 20

when are mergers used?

Answer 20

part of interval routine maintenance

to check conductors inside conduit and raceways

Question 21

category 1 dmm

Answer 21

can read anything that is plugged in to

Question 22

category 2

Answer 22

can read any devices and receptacles so longs as it is not within 10 meters of main cat 3 source and 20 meters of cat 4 source

Question 23

category 3

Answer 23

can read anything fused up to bus bars in main service panel, including permanently installed loads

Question 24

category 4

Answer 24

can read anything

Question 25

what category meters do electricians need?

Answer 25

cat 3

Question 26

what is important about meter leads

Answer 26

that the meet or exceed category rating of the meter

Question 27

how are voltmeters placed in a cct

Answer 27

paralell

Question 28

how are ammeters place

Answer 28

in series

Question 29

window where the reading appears

Answer 29

display

Question 30

bar graph represents analog meter true or false

Answer 30

true

Question 31

steps for diagrams

Answer 31

draw schematic diagram add meters label convert wiring diagram