The Cathode Ray Oscilloscope and Digital Real-Time Oscilloscope

1. The Cathode Ray Oscilloscope:

CRO or cathode ray oscilloscope is used to visualize at the voltages that change with the time such that the AC voltages and signal waveforms from waveforms form amplifiers.  The voltages on the X-Plate of the cathode ray oscilloscope makes the electrons beam sweep across the screen. This sets the time base.  The spot on the screen shows how the Y-voltages vary with the time. This process is shown in below figure (a).

 

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In this example the cathode ray oscilloscope measures the sine wave with the peak amplitude of 5V and the frequency of 50 Hz. The two properties we need to know about the sine wave is its amplitude and frequency. Here we are using Digital Oscilloscope with LCD (Liquid Crystal Display) panel. Volts/div. and Time/div. are controlled digitally through Auto set button. Even other electrical calculations are done directly through

this oscilloscope. There are several controlling knobs and buttons that are quite user friendly.

 

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(b)CRO With Controlling Knobs

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2. Digital Real-Time Oscilloscope

After learning about the cathode ray oscilloscope, now I tell you about the Digital Real Time Oscilloscope. In Below figure you can see the shape of Digital Oscilloscope.

 

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Digital Real Time Oscilloscope

 

General Features of Digital Oscilloscope:

Here the general features of digital oscilloscope are listed.

  • • 100MHz (TDS220 or TDS224) or 60MHz(TDS210)bandwidth with selectable 20 MHz bandwidth
  • • limit.
  • • 1GS/s sample rate and 2,500 point record length for each channel
  • • Cursors with readout
  • • Five automated measurements
  • • High-resolution, high-contrast LCD display with temperature compensation and replaceable back

Light.

  • • Setup and waveform storage
  • • Autoset for quick setup
  • • Waveform averaging and peak detection
  • • Digital real-time oscilloscope
  • • Dual time base
  • • Video trigger capability
  • • RS-232, GPIB, and Centronics communication ports easily added with optional extension modules
  • • Variable persistence display
  • • User interface available in ten user-selectable languages.

These were the general and common features of digital oscilloscope. Now I tell you how to check the oscilloscope. This is called Functional of check of oscilloscope.

Functional Check of Oscilloscope:

Perform this quick functional check to verify that your instrument is I operating correctly.

  1. Turn on the instrument.

Wait until the display shows that all self tests passed. Push the SAVE/RECALL button, select Setups in the

top menu box and push the Recall Factory menu box. The default Probe menu attenuation setting is 10X. As shown in below figure diagram :

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1 Set the switch to 10X on the P2100 probe and connect the probe to channel 1 on the oscilloscope.

To do this, align the slot in probe connector with the key on the CH 1 BNC, push to connect, and twist to

the right to lock the probe in place. Attach the probe tip and reference lead to the PROBE COMP

connectors.

2 Push the AUTOSET button. Within a few seconds, you should see a square wave in the display

(approximately 5 V at 1 kHz peak-to-peak). Push the CH 1 MENU button twice to turn off channel, push

the CH 2 MENU button to turn on channel 2, repeat steps 2 .and 3. For TDS 224, repeat for CH 3 and CH

4.

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Using Autoset

 

The Autoset function obtains a stable waveform display for you. It automatically adjusts the vertical and

horizontal scaling, as well as the trigger coupling, type, and position, slope, level and mode settings.

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