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70 User Manual
Window Trigger
Window trigger provides a high trigger level and a low trigger level. The instrument
triggers when the input signal passes through the high trigger level or the low trigger level.
There are two kinds of window types: Absolute and Relative. They have different trigger
level adjustment methods. Under Absolute window type, the lower and the upper trigger
levels can be adjusted respectively via the Level knob; under Relative window type, adjust
the Center value to set the window center; adjust the Delta value to set the window range,
the lower and the upper trigger levels always move together.
Horizontal Trigger Position
High Level
Low Level
●
If the lower and the upper trigger levels are both within the waveform amplitude range,
the oscilloscope will trigger on both rising and falling edge.
●
If the upper trigger level is within the waveform amplitude range while the lower
trigger level is out of the waveform amplitude range, the oscilloscope will trigger on
rising edge only.
●
If the lower trigger level is within the waveform amplitude range while the upper
trigger level is out of the waveform amplitude range, the oscilloscope will trigger on
falling edge only.
To set window trigger via Absolute window type:
1. Press the Setup button on the front panel to enter the TRIGGER function menu.
2. Press the Type softkey; then use the Universal Knob to select Window and push
down the knob to confirm.
3. Press the Source softkey; turn the Universal Knob to select CH1 or CH2 as the
trigger source.
4. Press the Window Type softkey to select Absolute.
5. Press the Lower Upper softkey to select Lower or Upper trigger level; then turn the
Trigger Level Knob to adjust the position. The trigger level values are displayed at
the upper right corner of the screen.
The Lower trigger level cannot be higher than the upper trigger level. In the trigger
state message box, L1 means the upper trigger level while L2 means the lower trigger
level.