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"Manual" option should be used. Under this option, the trigger level can be manually
adjusted by the user.
8.3 Display
“Persistence” is to make the historical waveform remain on the screen for a
while and then disappear. Optional persistence options are: None, 1s, Infinite. When
Infinity is selected, the waveforms that have appeared on the screen will remain
forever and will not disappear.
“roll” is to display the waveform while sampling. Only when the time base is
greater than or equal to 200ms will the roll mode be entered. If roll is turned off, the
waveform will be displayed after one screen is sampled, resulting in a long time
before the screen is refreshed for large time base.
Roll mode does not support triggering, if you need to perform a single
trigger(time base >= 200ms), please turn off roll mode.
“FFT”: fast Fourier transform calculation. The frequency cursor is supported, but
the amplitude cursor is not supported.
8.4 Settings
The calibration option is used to calibrate the zero point of the oscilloscope.
Self-calibration is required when the outside temperature changes or when there is a
zero offset due to aging. Remove the probes before calibration.
Furthermore:
1. In the settings, you can set whether to automatically shut down, if you choose
automatic shutdown, the oscilloscope will automatically shut down 15 minutes after
no key operation.
2. Choice of language: Chinese or English.
3. Keep this menu open, and long press "V" to Check the firmware version.
4. Keep this menu open, and long press "RunStop" to reset the oscilloscope
settings.
5. Keep this menu open, and long press "S" to switch the background color of
the measurement item
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