43
/
99
7.10 Duration Trigger
With duration trigger selected, the oscilloscope identifies the trigger condition by looking for the duration
of the specified codes. The codes are the combination of channel logic "AND", and the value of each
channel can be H (high), L (low), or X (ignored). When the duration (
△
T) of the code meets a preset time,
it will be generated, as shown in Figure 7-7.
Figure 7-7
(1) Code
It has three modes H, L and X. The code setting of each channel is displayed at the bottom of the
screen, as shown in Figure 7-7.
a. H
：
Set the code value of the selected channel to "High", that is, the voltage level is higher than
the trigger level of the channel.
b. L
：
Set the code value of the selected channel to "Low", that is, the voltage level is lower than
the trigger level of the channel.
c.
X
：
Set the code value of the selected channel to "Ignored", that is, the channel is not part of the
codes. The oscilloscope will not trigger if all channels in the codes are set to "ignored".
(2) Condition
Press the condition key to select:
＞
,
＜
.
≤≥
.
a.
＞：
It will be generated when the code duration is greater than the setting time, it can set the
lower limit of time.
b.
＜：
It will be generated when the code duration is small than the setting time, it can set the
upper limit of time.
△
T
