Tektronix TDS 200-Series, User Manual

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Reference
TDS 200-Series Digital Oscilloscope User Manual
75
Key Points
SEC/DIV. If waveform acquisition is stopped (using the RUN/STOP
button), the SEC/DIV control expands or compresses the waveform.
Scan Mode Display. When the SEC/DIV control is set to 100 ms/div or
slower and the trigger mode is set to Auto, the instrument enters the
scan acquisition mode. In this mode, the waveform display updates
from left to right. There is no trigger or horizontal control of
waveforms during scan mode.
Window Zone. Use the window zone to expand a segment of a
waveform to see more detail. The Window time base setting cannot
be set slower than the Main time base setting.
Main
time base
displayed
Window zone
displayed
Vertical bars define window zone
Holdoff. Use holdoff to help stabilize the display of nonperiodic
waveforms.
Holdoff begins when the instrument recognizes a trigger event and
disables the trigger system until acquisition is complete. The trigger
system remains disabled during the holdoff time that follows each
recognized trigger event.