For the display shows a waveform stationary every scan, it is necessary to start it at the same point in the cycle of the input signal. When a frequency sweep is very low, resulting in a "deviation" apparent on the display to the left of the CRO. Therefore, the result of a very high frequency scanning, is shown with an apparent shift to the right.
Obviously, it is impractical to adjust the frequency sweep for the same value of signal frequency in order to obtain a scan stationary. In practice, one must wait until the signal reaches the same point in a cycle to start with the beginning of the stroke. Are described below various resources available to perform this shot.
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