Teledyne LeCroy HDO 4000 Operators Manual - Manual (Page 33)

HDO4000 High Definition Oscilloscope
The zoom's Vertical and Horizontal units will differ from the source trace, as seen from a comparison of
the trace descriptor boxes, because the zoom is showing a scale, not a measured level.
Channel descriptor box and its Zoom descriptor box.
You can further adjust these settings using the Front Panel knobs, or by changing the settings on the
Zoom dialog. Touch the zoom descriptor box to activate it, then touch it again to display the Zx tab.
Because it is a calculated and not a sampled trace, you can adjust the zoom's Horizontal Scale without
changing the oscilloscope's Timebase (a characteristic shared with math and memory traces).
Turn off Zoom
Turn off a zoom trace the same as you would any other trace:
l
Deselect the Trace On checkbox on the Zoom dialog.
l
Touch-and-hold (right-click) the descriptor box until the pop-up menu opens, then choose Off.
Quick Zoom
Use the Front Panel Zoom button to quickly create one zoom trace for each displayed channel trace.
NOTE: Quick zooms are created at the same vertical scale as the source trace and 10x horizontal
magnification.
To turn off the quick zooms, press the Zoom button again.
Zoom Controls
Once the zoom trace has been created, adjust its Vertical and Horizontal Scale to further "zoom" in or out.
You can do this by activating the zoom trace and using the Front Panel Vertical and Horizontal knobs, or
by modifying settings on the Zoom dialog.
To access it the Zoom dialog, double-touch any zoom trace descriptor box, or choose Math > Zoom Setup
from the menu bar.
The Zoom dialog contains selection boxes for turning on/off zoom traces. There is also an option to Reset
Zoom to x1 magnification.
The Zoom dialog contains a separate tab for each potential zoom trace (Z1-Z4). Each dialog reflects the
current scale settings for that zoom.
922498 Rev B 25