Gage CompuScope 85GC, Hardware Manual And Driver Installation Manual

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146 CompuScope 1610C
CompuScope 1610C triggering
CompuScope 1610C features state-of-the-art Windowed triggering. The user has the ability to set up two
independent trigger sources per card that are ORed by the on-board circuitry.
Each of the two trigger sources are designed to be similar to an oscilloscope, so the user can easily replace the
Digital Oscilloscope in his or her application with a CompuScope 1610C. A user can select the trigger source,
trigger level and trigger slope using software commands.
The user can software-select the trigger source from any one of the following:
•
Channel 1
•
Channel 2
•
External Trigger
•
Software Trigger
The selected trigger source is then compared to a trigger level set by an on-board, 12 bit software-controlled
DAC (only the 8 most significant bits are actually used). An on-board, high-speed comparator is used for this
function, making it possible to trigger on narrow pulses or glitches that are much shorter than the sample rate.
Each time the selected signal crosses the trigger level, the on-board triggering circuitry monitors it for the slope
selected by the user. When the appropriate slope is detected, a Trigger signal is generated.
Figure 85: Generation of a trigger signal – negative slope