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6.1 Horizontal Scale
Horizontal scale which is horizontal time base, the time value represented by each scale in the horizontal
direction of the display screen, usually expressed as s/div. Rotate the SCALE knob in the HORIZONTAL
control area and set the horizontal scale according to 1-2-5 order, that is 1 ns/div, 2 ns/div, 5ns/div, 10
ns/div, 20 ns/div... 500 s/div, 1 ks/div. Turn clockwise to decrease the scale, turn counterclockwise to
increase the scale. When adjusting the horizontal time base, the scale information will appear in the upper
left corner of the screen (as shown in Figure 6-1), it changes in real time.
Figure 6-1
When the time base is changing, waveform will be change with trigger point to extension or compressed
accordingly.
6.2 ROLL Mode
When trigger mode is in auto state, rotate SCALE knob in the HORIZONTAL control area, the
oscilloscope will enter ROLL mode when horizontal scale slow to 20 ms/div.
The oscilloscope will continuously draw a voltage-time trend of the waveform on the screen. In this mode,
the waveform is scrolled from right to left to refresh the display, and the latest waveform is drawn at the
far right end of the screen. The diagram as shown in Figure 6-2.
Horizontal timebase
Trigger
point
