Review sheet

Question 1

The mirror strip on the face of some meters is there for what purpose?

Answer 1

more accurate reading, if you see reflection then you’re reading at the wrong angle

Question 2

The percent error of a meter is?

Answer 2

constant only for full scale deflection

Question 3

A meter has an accuracy of 3% at full scale deflection. It reads 120v on the 250v scale. What is the correct reading?

Answer 3

112. 5volts to 127.5volts

250x0. 03= 7.5 then add/subtract to voltage reading

Question 4

comparing a meters reading with a precisely accurate laboratory meter is called?

Answer 4

calibrating

Question 5

how does the digital meter differ from the analog?

Answer 5

digital is a number

analog is a pointer

Question 6

what are the two common type of portable digital meters?

Answer 6

handheld and bench type

Question 7

The window where the reading of the digital meter appears is called the?

Answer 7

display

Question 8

What is the significance of a bar graph display on a digital meter?

Answer 8

gives analog indication of full scale reading

Question 9

What is meant by the resolution of a digital meter?

Answer 9

least significant figure of the digital display

Question 10

where is the zero adjust screw located on a meter?

Answer 10

the front

Question 11

function of the zero ohms adjustment knob?

Answer 11

compensate for voltage variations in battery

Question 12

True or False? Digital meters have d’arsonval meter movement?

Answer 12

false

Question 13

True or False? Reversing the polarity of the leads will damage a digital meter

Answer 13

False

Question 14

True or False? digital meters require a separate battery for the read out?

Answer 14

true

Question 15

If the range selector switch is set to the lowest voltage range, the multiplier resistance will be at its ________ value?

Answer 15

lowest

Question 16

A voltmeter has a range selector switch marked 10v, 50v, 150v. Coil draws 50microamps on fsd. What is the sensitivity?

Answer 16

same for all ranges

Question 17

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

Answer 17

no voltage 0v

Question 18

What category of voltages is the solenoid-and-plunger tester ideal for?

Answer 18

nominal voltages

Question 19

How is a shunt connected in relation to the coil of the galvanometer?

Answer 19

in parallel

Question 20

Why is it necessary to use a make-before-break type of switch for the range switch of an ammeter?

Answer 20

to prevent excessive current flow

Question 21

What is the effect on the ammeter reading if the leads are changed to a smaller conductor size?

Answer 21

meter reads lower current than circuit current

Question 22

What is the function of the resistor in the ohmmeter?

Answer 22

to compensate for drop in the battery output voltage

Question 23

Which of the 3 coils in the wattmeter is the moveable coil?

Answer 23

potential coil (voltage coil)

Question 24

If the polarity of a wattmeter is incorrect what happens?

Answer 24

pointer tries to move backwards

Question 25

What keeps the pointer at 0 when the meter is not registering any power?

Answer 25

spiral spring

Question 26

What is the purpose of damping magnets in the energy meter?

Answer 26

to create counter torque on the disk allowing for speed adjustment