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50 UTD1000L User Manual
6.3.3 Zooming in/out Waveforms
Switch on horizontal menu and press F1 button to zoom in one segment of the wavefom. The
timebase for expanded window shouldn’t be lower than that of main window. Note: Timebase
faster than 100ns cannot enter into expanded window.
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:
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