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ECNG1012 : Engineering Science and Technology (Semester I- 2024/2025)

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The oscilloscope is used to display waveforms produced by circuits or produced by the output devices such as the power supply or function generator. What type of waveform is shown in the picture below?

  square wave

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Using the picture of the power supply below, which knobs are used for current limiting purposes?

dual power supply 2
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GIven the picture of a power supply and the diagram provided, what are the the respective values of the voltages A, B, C, D, E ? 

dual power supply

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X-Y operating mode is used to plot the Channel 2 signal on the Y axis and the Channel 1 signal on  the X axis. This mode is independent of the time and plots CH2 voltage with respect to CH1 voltage. To activate X-Y mode on the 2160A oscilloscope, which three actions must be performed?

i. Switch 27 must be set to its X-Y position.ii. Knob 30 must be set to the MAIN position.

iii. Switch 10 must be set to its AC position.iv. Switch 18 must be set to its X-Y position.v. Switch 11 must be set to its DC position.vi. Knob 30 must be set to the X-Y position.

2160A oscilloscope

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Power supplies take in DC power and output AC power.
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When the oscilloscope trigger coupling switch is set to AUTO and the oscilloscope is NOT triggered properly, free runs of the waveform (i.e. constant redrawings of the input waveform) are observed on the oscilloscope screen. Which of the following is NOT an example of a free running waveform? Note that three common types of time varying waveforms you will encounter in the lab are sine waves, square waves and triangular waves.

1.        1

2.        2

3.        3

4.        4

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The oscilloscope settings for waveform shown below are as follows:

  • the CH1 VOLTS/DIV setting is 2 VOLTS/DIV,
  • the CH2 VOLTS/DIV setting is 0.5 VOLTS/DIV and
  • the TIME/DIV setting is 0.2 mS/DIV and

  • X5 MAG is enable for CH1.
  • X10 mag is enabled.

Note: each square on the oscilloscope grid / articulate has a height of 1 DIV and a width of 1 DIV.

Given that it is the Channel 1 waveform being displayed, what is the peak to peak voltage of the waveform in Volts (pk-pk)

Do not include the units i.e. Volts (pk-pk) in your answer as it will be marked as incorrect by the software. Enter the value only.

 triangular wave
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When the TRIGGER COUPLING switch is set to AUTO and free runs are displayed on the oscilloscope screen, which of the following is implied?

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Match the settings of the input coupling (i.e. AC-GND-DC) switches on the oscilloscope to their functions.  
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Where are the vernier adjustment calibration knobs located on the 2121 oscilloscope?

i) In the center of the CH1 Volts/Div knob (Position 16).

ii) In the center of the CH2 Volts/Div knob (Position 17).

iii) The VARiable Sweep control knob (Position 29).

iv) TRIG LEVEL knob (Position 25)

v) TIME/DIV knob (Position 20)

oscilloscope

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