2. You can miss triggers, whose duration is less than N samples, where N is the value of REC.GAP. This is
because the trigger is only evaluated every N samples.
A workaround for the above effects is available by setting the recorder trigger position to zero (REC.TRIGPOS
0). This eliminates conflicts between pretrigger and post-trigger timing and will guarantee trigger evaluation every
sample, eliminating the cases above.
15.2.2.6 Trigger Slope
Trigger Slope specifies whether you trigger on a positive or negative change in the trigger source. The effect of
the trigger slope is different for trigger type Boolean and On Next Signal modes.
Boolean Trigger Type
When using Boolean type:
l A positive slope will trigger when the trigger source is 1
l A negative slope will trigger when the trigger source is 0
The boolean trigger type is a state trigger. There is no need to transition from 0 to 1 to trigger with the positive
slope. If the trigger source is 1 from the start, the positive slope will immediately trigger.
On Next Signal Trigger Type
With “On Next Signal” trigger type allows you to specify if the recorder should trigger when the signal crosses the
trigger level in the positive or negative direction. The signal only needs to reach the trigger level; it does not need
to pass the trigger level.
In the examples below, the trigger value is set to 3 (REC.TRIGVAL 3.000). You can see that with positive slope,
the trigger occurs exactly when the signal transitions from 2 to 3, because it reached 3. The negative slope case
triggers when the signal transitions from 9 to 0, because it crossed 3 on the way.
15.3 Scope Settings
Scope settings are used to store and retrieve the scope parameters.You can save multiple settings, called "pre-
sets", under different names. You can save, delete, import, or export the presets. The settings are stored in Work-
Bench project file (default.wbproj) and settings are common to all the drives in WorkBench.
AKD User Guide | 15 Scope
Kollmorgen | December 2010 185
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