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3.2.
Adjusting the horizontal time base
Horizontal time base, also called the horizontal scale, refers to the time of each grid in the horizontal
direction of the screen. It is usually expressed in s/div.
When changing the horizontal time base, the displayed waveforms of all channels are expanded or
compressed horizontally relative to the trigger reference point. The horizontal time base in the upper right
corner of the screen is as shown in the figure below.
Turn the Rotary-3 to set the horizontal time base within the usable range (clockwise to decrease the
horizontal time base and counterclockwise to increase it). It will adjust the horizontal time base of the
waveforms of all channels in 1-2.5-5 steps within the adjustable range.
3.3.
Trigger mode
For a digital oscilloscope, it continuously samples the waveform regardless of whether it is triggered stably
or not. Only in stable trigger condition can the signal be displayed stably. In order to keep the observed
signal constant on the screen, the trigger source must be selected for that channel. But only channel setting
is not enough. The trigger level should also be set to a level from the maximum and minimum range of the
signal. Otherwise, it will be difficult to observe because the signal will be very moving on the screen.
Trigger source:
The submenu is opened by clicking
the “
Trigger
” button to select the trigger source. To set t
he trigger to
the CH-
1 channel, the “
Trig CH1
” button in the submenu is
clicked.
Trigger level:
After the trigger source is selected, Rotary-3 button is pressed once and trigger level adjustment mode is
entered. Turn the Rotary-3 to adjust (clockwise to increase level and counterclockwise to decrease). It is
also possible to adjust with the
“
Increase
”
and
“
Decrease
”
buttons in the
“
Trigger
”
submenu.
The trigger level will be displayed on the screen with a horizontal line while moving, and the trigger level
information (as shown in the figure below) will change according to the level just above the trigger level
line.
When you stop changing the trigger level, the level line disappears in about 1 s.
