Record length matches the memory space subject to the signal registration in a digital oscilloscope. Record length is set by the number of points – from hundreds to several millions of them. The maximum record length depends on the scope memory space. Record length increase causes the signal registration time increase at the same record frequency and vice versa.
In the picture below the record length coincides with the number of points (samples) of the acquired waveform marked with a dashed rectangle. The horizontal position of the reference point, concurred with the trigger point, coincides with the number of samples needed for data storage in the device memory before the trigger moment. When the signal record before the trigger point is unnecessary the reference point will coincide with the first sampled point.
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