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* AC Line: AC power can be used to display signals related to the power line frequency, such as lighting
equipment and power supply devices. The oscilloscope gets triggered on its power cord, so you
do not have to input an AC trigger signal. When AC Line is selected as trigger source, the
oscilloscope automatically set coupling to DC, set trigger level to 0V.
2. Trigger Mode:
The trigger mode determines how the oscilloscope behaves in the absence of a trigger event. The
oscilloscope provides three trigger modes: Auto, Normal, and Single.
* Auto:
This sweep mode allows the oscilloscope to acquire waveforms even when it does not
detect a trigger condition. If no trigger condition occurs while the oscilloscope is waiting for
a specific period (as determined by the time-base setting), it will force itself to trigger.
* Normal:
The Normal mode allows the oscilloscope to acquire a waveform only when it is triggered.
If no trigger occurs, the oscilloscope keeps waiting, and the previous waveform, if any, will
remain on the display. Single: In Single mode, after pressing the Run/Stop key, the
oscilloscope waits for trigger. While the trigger occurs, the oscilloscope acquires one
waveform then stop.
* Single:
In Single mode, after pressing the Run/Stop key, the oscilloscope waits for trigger. While
the trigger occurs, the oscilloscope acquires one waveform then stop.
3. Coupling:
Trigger coupling determines what part of the signal passes to the trigger circuit. Coupling types include AC,
DC, LF Reject and HF Reject.
* AC:
AC coupling blocks DC components.
* DC:
DC coupling passes both AC and DC components.
* LF Reject: LF Reject coupling blocks DC component, and attenuates all signal with a frequency lower
than 8 kHz.
* HF Reject: HF Reject coupling attenuates all signals with a frequency higher than 150 kHz.
4. Holdoff:
Trigger holdoff can be used to stabilize a waveform. The holdoff time is the oscilloscope's waiting period
before starting a new trigger. The oscilloscope will not trigger until the holdoff time has expired. It provides a
chance for user to check the signal in a short period and helps to check some complex signals, such as AM
waveform etc.
19.2. How to Operate the Function Menu
The function menu control zone includes 8 function menu buttons: Measure, Acquire, Utility, Cursor,
Autoscale, Save, Display, Help and 4 immediate-execution buttons: Autoset, Run/Stop, Single, Copy.
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