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Functions Menu
Type
Mode
Polarity
Pulse Condition
Threshold
Alternate Trigger
•
When alternate trigger is selected, the trigger signal will be present in two vertical
channels. This triggering mode is suitable for observing two signals of unrelated
signal frequencies
•
Alternate trigger can also be used to compare pulse widths
Adjusting the Holdoff time
•
You can adjust the holdoff time to observe complicated waveforms. Holdoff time
means the waiting time for the trigger to be ready for use again. During this time the
oscilloscope will not trigger until the holdoff is complete.
•
Follow the normal signal synchronisation procedure and select the edge, trigger
source and inclination in the trigger menu.
•
Adjust the trigger level to make the waveform display as stable as possible.
•
Press F1 to switch between main and extended.
•
Enter the dual time base menu.
•
Use the MULTIPURPOSE control to set the holdoff time between 96ns to 1.5s.
Note: Holdoff time is usually slightly shorter
than the 'large cycle'. When observing an
RS-232 communication signal waveform it is
easier to observe if holdoff time is slightly longer
than the starting edge time of every data frame.
Setup
Video
Auto
The system automatically samples waveform data when
there is no trigger signal input. The scan baseline is shown
on the display. When the trigger signal is generates it
automatically turns to trigger scan.
Normal
The system stops acquiring data when there is no trigger
signal. When the trigger signal is generated trigger scan
occurs.
Single
One trigger will occur when there is an input trigger signal.
Then trigger will stop.
Rise
Select the rising edge within the threshold for trigger
Fall
Select the falling edge within the threshold for trigger
Trigger when signal slew rate is larger than set value
Larger
Trigger when signal slew rate is smaller than set value
Smaller
Trigger when signal slew rate is equal to the set value
Equal
Set slew rate value with the MULTIPURPOSE control
Set the low level value with the MULTIPURPOSE control
Low
High
Set the high level value with the MULTIPURPOSE control
High & Low
Set the high & low level value with the MULTIPURPOSE control
Notes
15
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