Figure 6-5 Screen Display under Window Zoom
Under window zoom function, there are two separate display zones as indicated in the figure above.
The upper part is for the original waveform. Press OK button and then use Left and Right buttons to select
the waveform to be expanded on the left or right, or enlarge or narrow down the selected zone with s/ns
button.
The lower display is for the expanded waveform corresponding to the selected original zone. One
point worth mentioning is that compared with the main timebase, the expanded timebase has improved
the resolution for the waveform display (See Figure 6-5). Since the displayed waveform corresponds to the
selected zone of upper part, using s/ns button to narrow down the selected zone can enable the expanded
waveform to have better timebase, namely, a higher waveform amplification factor in a horizontal
direction.
6.3.4 Adjusting Trigger Hold-Off
Switch on horizontal menu, use Right and Left buttons to adjust hold-off time (100ns-1.5s). It can be
applied to observe complex waveforms (eg: burst). Hold-off time is to adjust data acquisition period of the
oscilloscope to stay in a integral multiple related to the period of complex waveform so that the
Oscilloscope and complex waveform can synchronize.
For example, apply tested combined signals into CH1. Press HORIZONTAL to turn on horizontal menu,
then press Right and Left buttons to adjust the hold-Off time until displayed waveform become stable. See
Figure 6-6:
46 UTD1000L User Manual
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