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Why does my DS1000E seem to miss the first trigger points on slow time scales?

Last Updated: Dec 30, 2015 05:13PM PST
Why does my DS1000E seem to miss the first trigger points on slow time scales?

When the horizontal time base is set to 50ms or slower ,the scope will go into the slow scan mode. In this mode, the scope acquires sufficient data for the left side of the trigger point, then wait for trigger, when trigger occurs, it continues to draw the rest of the wave from the trigger point to the end of the right side. So when we measure low frequency signals, we usually choose slow scan mode to check the whole signal.

In slow scan mode there will be less delay between the trigger and the display if the trigger is all the way to the right. Then all of your data will be pre-trigger.
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