User manual

Digital Storage Oscilloscope 28
channel included in the pattern. When an edge is specified, the oscilloscope will trigger
at the edge specified if the pattern set for the other channels are true (namely the
actual pattern of the channel is the same with the preset pattern). If no edge is
specified, the oscilloscope will trigger on the last edge that makes the pattern true. If all
the channels in the pattern are set to "Don’t Care", the oscilloscope will not trigger.
To set interval trigger:
1. Press the [Trig Menu] button on the front panel to enter the Trigger system function
menu.
2. Press the Type softkey, then use the Universal Knob to select Pattern and push
down the knob to confirm.
3. Press the Logic softkey, turn the Universal Knob to select a logical "AND" or “Or”
combination of channels and push down the knob to confirm.
4. Press Pattern to set the pattern of the current signal source, turn the Universal
Knob to select a pattern. At this point, the corresponding pattern is displayed on the
menu. The patterns of channels CH1-CH4 are presented from left to right. You can set
the pattern of a signal source when the souce is open. Press Pattern softkey to set
pattern for other source.
1: Set the pattern of the channel selected to "H", namely the voltage level is higher
than the trigger level of the channel.
0: Set the pattern of the channel selected to "L", namely the voltage level is lower
than the trigger level of the channel.
X: Set the pattern of the channel selected to "Don’t Care", namely this channel is
not used as a part of the pattern. When all channels in the pattern are set to "Don’t