Trigger Source Selection
- Here we will explain the ideas behind the selection of a Trigger Source.
- Well firstly we must remember that in order to Trigger the Trace
at exactly the same time on each cycle of the input signal we use a reference signal
connected to the Triggering Circuit.
- There are Four choices of signal source to trigger from and these are as follows:
1. Selecting INT as the Trigger Source:
- O.K. the first trigger setting we should try is always the INT or intermittent selection.
- This selection uses the signals applied to Channel A and Channel B to trigger the device.
- It is usually suitable for the requirements within the laboratory.
2. Selecting CH-B as the Trigger Source:
- This setting merely uses any signal applied to Channel B as the Trigger reference.
- It should be selected in the event that there is no signal applied to Channel A or when the
signal being applied to Channel B is a particularly good signal reference.
3. Selecting LINE as the Trigger Source:
- In this case the CRO uses the signal in the A.C. power line as the Trigger reference.
4. Selecting EXT as the Trigger Source:
- This selection is quite useful as it allows us to use any signal as a Trigger Reference.
- It can be used in cases where an extremely accurate reference is required.
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