Selecting the Mode of Operation

• The CRO has four Modes in which the input signal(s) can be displayed. These modes are as follows:

1. Channel A Operation:

• When the mode selector is in this position we find that the only signal that can be viewed on the display is one that has been applied to the input labelled Input Y which is the coaxial input on the left side of the Mode Selector.
• It should also be noted that the controls in the diagram above on the right hand side of the Mode Selector will have no effect on the signal being viewed on the display as they are not functional when the CRO is in Channel A Operation.

2. Channel B Operation:

• When the mode selector is in this position we find that the only signal that can be viewed on the display is one that has been applied to the input labelled Input X which is the coaxial input on the right side of the Mode Selector.
• It should also be noted that the controls in the diagram above on the left hand side of the Mode Selector will have no effect on the signal being viewed on the display as they are not functional when the CRO is in Channel B Operation.

3. Dual Operation:

• When the CRO is being used in Dual Mode it becomes a much more powerful device than when it is used to measure just one signal at a time.
• Here the CRO can accomodate the input signals from both of the input terminals. This allows the comparison of the two input signals not only in terms of quantitative results but also qualitative observations.
• It allows us to superimpose for example the ouput and input signals of a circuit and observe any distortions due to the circuit such as:
  
  • • Phase Change
    • Change in amplitude of the signal
    • Change in Frequency
    • Or any other distortion of the signal.

4. Add Operation:

• As is expected the function of this mode of the CRO is the geometrical addition of the input signals applied to channel A and B leaving one signal on the display.
• Subtraction can also be achieved using the invert function by "pulling out" the Vertical Position Control for channel B.

Back to CRO Features

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Revised: Friday, 17 July 1998