E-3 Meters And Test Equipment

Question 1

Oscilloscopes show :

Answer 1

Waveform , Time , Peak to Peak voltage , Phase Relationship

Question 2

Construction of a Oscilloscope :

Answer 2

Electron gun , horizontal + vertical deflection plates , fluorescent screen

Question 3

What does the Electron Gun do ?

Answer 3

Emits beam of electrons . Beam travels through deflection plates to the screen .

Question 4

What results because of “ too strong a beam “

Answer 4

The phosphur burns a hole into the fluorescent screen

Too much Intensity

Question 5

Why is Trace observed on the Oscilloscope screen ?

Answer 5

Electrons are striking the screen , Location of the wave is determined by the voltages on the deflection plates .

Question 6

How is Saw tooth Voltage produced ?

Answer 6

Made by the Internal Sweep Generator

Question 7

What is the Grid System called?

Answer 7

Graticule

Question 8

What does Voltage control in the Oscilloscope ?

Answer 8

vertical deflection plate

Question 9

What does Frequency control in the oscilloscope?

Answer 9

horizontal deflection plate

Question 10

Saw tooth Voltage is triggered by :

Answer 10

Internal Sweep Generator / Vertical Signal

Question 11

Magnitude of Voltage in an Electron gun can be :

Answer 11

1000 v - 25 000v

Question 12

What does Intensity Control do ?

Answer 12

Allows Adjustment of Trace Brightness ( Bright to Dim)

Question 13

What plays a factor in producing Saw tooth ?

Answer 13

Triggered by voltage input on vertical plates

Question 14

What is the function of the Vertical Rotary Switch ( volts / div )

Answer 14

Increase + Decrease number of volts per block on screen

Question 15

DC - GND - AC <——-

Answer 15

All Dc signals are blocked , AC Signals appear on screen

Question 16

What is meant by the term “direct coupling” ?

Answer 16

All components of the vertical input signal appear on the screen

Question 17

GND means ground, ground :

Answer 17

Shows where the zero level is located, helps center the trace

Question 18

What does focus control do ?

Answer 18

Allows adjustment of Trace thickness + definition (less fuzzy)

Question 19

Amplitude is a measure of :

Answer 19

Peak to Peak

Question 20

Rms value is

Answer 20

.707

Question 21

average value of a sine wave is

Answer 21

0

Question 22

Average value is

Answer 22

.637

Question 23

How do you find voltage values?

Answer 23

Count the blocks up the y+ x the volts/div dial x the probe X1 is 1 X10 is 10.

Thus 2.4 x .5mv x 10 =

Question 24

How do you calculate time or frequency values?

Answer 24

Count the number of blocks for the entire wave (starting point to where it starts repeating), use the time/div dial .2ms/cm.

8 1/3 cm x .2ms/cm=
Or T=1/F
Or F=1/T