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3.3 History
Press History key, to display historical trend. Press directional keys ← → to backward or forward. Press
Zoom key to zoom in the time scale. The Zoom can be done variously in 1 sec/dot, 1 hour/Page, 12
hours/Page, 1 day/Page or 1 week/Page. Press Back key going back to the original display.
Figure 3 – 3
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