User manual

Reference
The trigger poi
nt can be set to the left or the right of the center of the screen. The
maximum number of divisions to the left depends on the Horizontal Scale (time
base) setting. For most scales, the maximum is at least 100 divisions. Placing the
trigger point off the screen to the left is called D elayed Sweep.
Set To Zero Button. Use to set the horizontal position to zero.
Horizontal Scale Knob (seconds/division). Use to change the horizontal time scale
to magnify or compress the waveform.
Key Points
Horizontal Scale. If waveform acquisition is stopped (using the Run/Stop
or Single button), the Horizontal Scale control expands or compresses the
waveform
. Use to zoom in on a detail of the waveform.
Scan Mode Display (Roll Mode). When the Horizontal Scale control is set to
100 ms/div or slower and the trigger m ode is set to Auto, the oscilloscope enters
the Scan acquisition mode. In this mode, the waveform display updates from left
to right. There is no t rigger or horizontal position control of waveforms during
scan m
ode. (See page 77, Scan Mode Display.)
Window Zone. Use the window zone option to define a segment of a w aveform to
see in more detail (zoom). The Window time base s etting cannot be set slower
than the Main time base setting.
Vertical bars define Window Zone
Main time base displayed Window zone displayed
Window. Expands the Window Zone to c over the entire screen. Use to change
between two time bases.
NOTE. When you change between the Main, Window Zone, and Window v iews,
the oscilloscope erases any waveform saved on the screen through persistence.
Persistence is erased with Horizontal menu changes.
Holdoff. Use holdoff to help stabilize the display of complex waveforms. (See
page 99, Holdoff.)
86 TBS1000 Series Oscilloscopes User Manual