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What are the major components
What are the major components
What is the purpose of an oscilloscope
What is the purpose of an oscilloscope
What is the purpose of an oscilloscope
What is the purpose of an oscilloscope
Oscilloscope: Screen
Oscilloscope: Screen
Oscilloscope: Input Channels
Oscilloscope: Input Channels
Equipment: Function Generator
Equipment: Function Generator
Channel Mode Switch
Channel Mode Switch
Cables
Cables
Making Your First Connection
Making Your First Connection
Time Per Division Dial
Time Per Division Dial
Horizontal Position
Horizontal Position
Adjusting the Display
Adjusting the Display
Measuring a Direct Current Voltage
Measuring a Direct Current Voltage
Volts/Div Dial
Volts/Div Dial
Setting Up the DC Power Supply
Setting Up the DC Power Supply
Setting Up the DC Power Supply
Setting Up the DC Power Supply
Setting Up the DC Power Supply
Setting Up the DC Power Supply
Setting Up the DC Power Supply
Setting Up the DC Power Supply
Setting Up the Power Supply
Setting Up the Power Supply
Observing the DC Output
Observing the DC Output
Measuring a Time Varying (A
Measuring a Time Varying (A
Function Generator Controls: Wave Shape
Function Generator Controls: Wave Shape
Function Generator Controls: Frequency Range
Function Generator Controls: Frequency Range
Function Generator Controls
Function Generator Controls
Function Generator Controls
Function Generator Controls
Function Generator Controls: Amplitude Dial
Function Generator Controls: Amplitude Dial
Making the Connection
Making the Connection
Making the Connection
Making the Connection
Making the Connection
Making the Connection
Triggering
Triggering
Triggering
Triggering
Triggering
Triggering
Triggering: Setup
Triggering: Setup
Measuring the Voltage
Measuring the Voltage
Mixing It Up
Mixing It Up
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Introduction to the Oscilloscope

содержание презентации «Introduction to the Oscilloscope.ppt»
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1Introduction to the Oscilloscope. 30time to connect the DC Power Supply to the
Professor Ahmadi ECE002. George Washington Oscilloscope. Locate Mini-Grabber
University. connectors on the other end of the cable
2OBJECTIVES. Lab Safety Review that was previously attached to the
Electrical Signals Quick Overview Explain Oscilloscope. Attach the connecters to the
Common Lab Equipment Oscilloscope, DC Power Supply as shown. Note: You may
Function Generator, etc. Learn how to use need to partially unscrew the terminal
an Oscilloscope to: Measure D.C. (Direct knobs before connecting the Mini-Grabbers.
Current) Voltage Measure A.C. (Alternating George Washington University.
Current) Voltage. George Washington 31Observing the DC Output. Once
University. connected, the line on the Oscilloscope
3Lab Safety. No Food or Drinks Use display will move up three divisions. At
Common Sense In Case of Emergency If 1Volt/Division, this equals 3 Volts.
electrical, turn off the main circuit Adjust the DC Power Supply output and the
breaker Call UDP at 4-6111 Notify the Volts/Division dial and observe the
staff in Room 304. George Washington changes. George Washington University.
University. 32Important Observations at This Point.
4Example Electrical Signal. Above, this Volts/Division Dial It does not change the
sine wave represents a voltage that is voltage. It is a sensitivity dial that
changing over time So at time=2.5s, what allows us to measure a wide range of
is the voltage? And again at voltages by indicating how many volts are
10seconds?...15 seconds? We can see that represented by each division. George
as time moves forward, the voltage is Washington University.
changing Is this an AC or DC voltage? What 33Finishing Up the DC Measurements. Go
does that mean? 5 2.5 -2.5 -5. Y=VOLTAGE ahead and… Turn off the DC Power Supply
(volts). X=TIME (seconds). 5 10 15 20. Disconnect the Mini-Grabbers. George
George Washington University. Washington University.
5The Theory… Why do we need an 34Measuring an AC signal. In this
oscilloscope? George Washington section, we will use the built-in FUNCTION
University. GENERATOR to create an AC signal to
6What are the major components? Display measure with the oscilloscope. George
Screen Displays an input signal with Washington University.
respect to time. Control Panel Adjusts how 35Measuring a Time Varying (A.C.)
the input signal is displayed. George Voltage. Now look at the function
Washington University. generator built into your Oscilloscope.
7What is the purpose of an This device produces a voltage that varies
oscilloscope. The purpose of an over time. In the upcoming slides we will
oscilloscope is to measure a voltage that exam each of the controls that allow us to
changes with time and show it in a shape the output. Built In Function
graphical format. Here is the oscilloscope Generator. George Washington University.
in our lab. -Notice the X-Y axes. 2) Here 36Function Generator Controls: Wave
is our alternating voltage signal from Shape. An important part of a function
before. 3) If we measure our signal with generator is the shape of the wave it
the scope, it would look like this! George creates. This function generator can
Washington University. produce a Square Wave Triangle Wave Sine
8What do we now know about the scope? Wave Press the FUNC key to change until
What must the X-Axis represent? What must the light below the Sine wave is lit.
the Y-Axis represent? So…what do the dials (Note: The Oscilloscope must be on in
do? George Washington University. order to change the this option.). George
9Oscilloscope: Screen. Notice that the Washington University.
screen has ruled divisions both 37Function Generator Controls: Frequency
horizontally and vertically. The axes can Range. This generator allows you to change
be scaled, for example… If each vertical the frequency (Cycles per Second) of the
division is worth 5 seconds, what time is output wave. There are two main settings:
represented by this point? If each Range/Order of Magnitude Scaling Factor
horizontal line represents 1 volt, what First, set the range to 1K (1 kilohertz)
voltage is represented by this point? by pressing the RANGE button until the
George Washington University. light below 1K is on. Then, turn the
10Oscilloscope: Control Panel. The frequency dial (Scaling Factor) so it
section to the right of the screen points straight up. This represents a
contains the controls necessary to adjust Scaling Factor of 1. Turning the dial to
how the waveform is displayed on the the left will reduce the output frequency
screen. The controls allow you to alter and to the right will increase it. 1. Set
the sweep time, amplitude, and triggering the Range to 1K. 2. Turn the Frequency
method. (Note, these topics will be Dial Until it Points Straight Up. What
discussed later). George Washington will the output frequency be with this
University. setup? What if the scaling was set to 1.5?
11Oscilloscope: Input Channels. How do George Washington University.
we get the voltage into the scope? This 38Function Generator Controls. 5 Volts
area is broken into two parts Left Half Peak-to-Peak. 2 Volts Peak-to-Peak. 1 Volt
for Channel 1 (X) Right Half for Channel 2 Amplitude. 2.5 Volt Amplitude. Not only
(Y) In the center is a switch that can we change the shape and frequency of a
determines which channel will serve as the wave, but we can also change the
input to the scope: 1, 2, Dual or Add. Why amplitude. George Washington University.
would we want more than 1 channel? Channel 39Function Generator Controls: Amplitude
2. Channel 1. George Washington Dial. Another 2 Parameter Control
University. DC-Offset (Inner Dial) Amplitude (Outer
12Equipment: Function Generator. Dial) Adjusting the outer dial Clockwise
Purpose: Produces waves of different will increase the amplitude.
Shapes (sinusoidal, square, etc.) Counterclockwise will decrease the
Amplitude Frequency Several available in amplitude. Turn the inner dial until it
the lab, but we will use the one built points straight up. Turn the outer until
into the Instek Oscilloscope. (Shown). it points straight up. Amplitude.
George Washington University. DC-Offset. George Washington University.
13The Setup… In this section, we will 40Making the Connection. Locate the
power on the oscilloscope and set it up to Function Generator’s Output. Using a
display a signal connected to the CH1 B.N.C. Cable, Connect the Function
input. George Washington University. Generator’s Output to the CH1 Input.
14Simple Signals We Can Measure. Is this George Washington University.
signal changing over time? What do we call 41Making the Connection. Set the
this type of signal? If we made a chart at Volts/Division dial to 2. The inner dial
the different time intervals… 5 2.5 -2.5 should be turned fully clockwise. Change
-5. Y=VOLTAGE (volts). X=TIME (seconds). 5 the AC-GND-DC switch to AC. Use the
10 15 20. George Washington University. Position dial to raise or lower the image
15Turning on the Oscilloscope. Press the until it is centered on the screen. George
POWER button located below the bottom Washington University.
right corner of the Oscilloscope’s screen. 42Making the Connection. The
Set the Channel Mode to CH1. Set the Time/Division dial corresponds to the
Trigger Mode to AUTO. A green line or dot amount of time in each division along the
should appear on the screen. If not, try X-direction. Set this dial to 0.5ms. If it
adjusting the Intensity or Position dials. isn’t already, turn the SWP. VAR. dial to
Set Trigger To Auto. Set Mode to CH1. CAL With 10 divisions per screen, what is
Press Power. George Washington University. the total time span represented? George
16Channel Mode Switch. The oscilloscope Washington University.
is capable of measuring voltages from two 43Triggering. Now we need to tell the
different sources. The channel mode switch scope when to display the signal. Electric
is used to alternate between these signals change much faster than we can
sources. For this lab, we will be using observe, so we must tell the Oscilloscope
Channel 1, so set the switch to the CH1 when to refresh the display. We accomplish
position. George Washington University. this by setting a Triggering Level. George
17Cables. We will use three types of Washington University.
connecters in this lab. BNC Banana 44Triggering. Without Triggering. With
Mini-Grabber. George Washington Triggering. George Washington University.
University. 45Triggering. We want to tell the
18Making Your First Connection. Obtain a oscilliscope when it is the best time for
BNC cable, Mini-Grabber attachment and it to “refresh” the display In our wave
connection them together. Connect the free below, we tell the scope to “trigger” or
end of the BNC cable to CH1 on the ‘capture’ the signal when it is going
oscilloscope. George Washington upward AND hits 2.0Volts. SO, ‘trigger’
University. condition is: When we’re. AND When at 2.0
19Time Per Division Dial. Find the Volts on our waveform! George Washington
Time/Div dial on the oscilloscope. This University.
dial controls the amount of time per 46Triggering: Setup. If it isn’t
centimeter division. Adjust to dial to 2 already, set the Trigger Source to CH1.
milliseconds per centimeter. George Set the Trigger Mode to Auto. In some
Washington University. cases, this is enough to produce a clear
20Horizontal Position. Adjust the output, but often we will need to adjust
Position dial for Channel 1 to center the the Trigger Level. If the output is
horizontal line. George Washington unstable, turn the triggering knob until
University. it stabilizes. George Washington
21Adjusting the Display. If the display University.
is difficult or out of focus, the 47Measuring the Voltage. Using the CH1
Intensity and Focus dials can be used to Position Dial, move the wave until the
adjust it. The INTEN dial controls the bottom line up with one of the division
brightness of the line. The FOCUS dial lines. Measure the number of divisions
controls the sharpness of the line. Take a from the bottom to the top. At 2 Volts Per
moment to adjust each one and notice the Division, This wave has an amplitude of
difference. George Washington University. 5V. Peak to Peak Voltage =
22At this point… The channel mode should (Volts/Division) *(# of Division)
be set to 1. The TIME/DIV should be set to Amplitude = (1/2) * Peak to Peak Voltage.
2mS per centimeter. A BNC cable should be George Washington University.
connected to the channel 1 input. The 48Measuring the Frequency. Position to
other end should have a free Mini-Grabber wave so that the beginning lines up with
connection. The Trigger Mode should be set one of the vertical division markers.
to AUTO. The Oscilloscope should be ON. Count the number of divisions until the
The intensity and focus should be adjusted beginning of the next wave. With
so the line is clear to see. The channel 1 0.5ms/division, this wave has a frequency
position dial should be adjusted so that of 1kHz. Period = (Time/Division) *(# of
the green line is centered on the screen. Division) Frequency = 1/Period. George
George Washington University. Washington University.
23Measuring a DC signal. In this 49Mixing It Up. Increase the
section, we will use an external DC POWER Volts/Division Dial to 5. Decrease the
SUPPLY to create a DC signal to measure Time/Division Dial to 0.2ms. Recalculate
with the oscilloscope. George Washington the Peak to Peak Voltage Amplitude Period
University. Frequency How do these results compare to
24Measuring a Direct Current Voltage. the ones you previously measured? Note: If
Set the VOLTS/DIV to 1 by adjusting the the signal becomes unstable, you may need
outer dial. Turn the inner dial all the to readjust the triggering level. George
way to the right, which will put it in the Washington University.
calibrated position. Switch the AC-GND-DC 50Changing the Frequency Generator. Now,
switch for channel 1 to DC. George change the amplitude on the frequency
Washington University. generator. Note that wave’s height grows
25Volts/Div Dial. The volts/div dial and shrinks as this dial is adjusted.
tells you the number of volts to be Next, try changing the frequency and the
represented by each centimeter vertically shape of the wave. Remember that the
on the screen. Here the outer dial is set Volts/Division, Time/Division and
to one, so each centimeter equals one Triggering Level may need to be adjusted.
volt. George Washington University. George Washington University.
26Setting Up the DC Power Supply. This 51Summary: Measuring A.C. Voltage. Turn
DC Power supply is capable of generating on the Oscilloscope. Use the built in
voltages from -25V to 25V. For this lab, function generator to set the shape,
we will be using the 6V supply terminals. frequency and amplitude of the desired
First, press the Power Button to turn it output wave. Connect the generator’s
on. George Washington University. output to the channel 1 input and set the
27Setting Up the DC Power Supply. Press input channel to AC. Approximate the
Output On/Off once to turn on the output. Time/Division and Volts/Division. Use the
Press the +6V button to tell the power Position Dial to center the wave on the
supply that we want to alter the output screen. George Washington University.
from the 6V terminals. Once done, your 52Summary: Measuring AC Voltage. Set the
screen should look the same as it does on Triggering Source to CH1. Set the
this slide. George Washington University. Triggering Mode to Auto. Adjust the
28Setting Up the DC Power Supply. The Triggering Level until the output wave
dial on the right hand side is used to stabilizes. Adjust the Volts/Division and
increase and decrease the output value. Time/Division dials until the desired
The arrows under the dial are used to output is produced. If needed, use the
determine which digit is affected by the Focus and Intensity Dials to sharpen the
dial. George Washington University. picture displayed. George Washington
29Setting Up the DC Power Supply. Press University.
the left arrow until the digit to the left 53Your turn… In this section, you are
of the decimal point is blinking. Use the put to the test! George Washington
dial to increase the display value to 3 University.
volts as shown. Note: You can safely 54Oscilloscope Problem. Using the
ignore the value of the right most digit function generator, create a wave with the
for this experiment. Press this arrow to following output: 3 kHz Frequency
Select the desired digit. This is the Sinusoidal Shape 2 Volt Amplitude Adjust
digit we want to adjust. Rotate this dial the output so that only 2 complete cycles
to alter the output value. George are showing. When are you finished, call
Washington University. over your TA to inspect it. George
30Setting Up the Power Supply. Now it is Washington University.
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Introduction to the Oscilloscope

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