External Source Mode - National Instruments PXI-6238 User Manual

Chapter 7 Counters

External Source Mode

In external source mode, the device generates a delayed Source signal by
delaying the Source signal by several nanoseconds. The device
synchronizes signals on the rising edge of the delayed Source signal, and
counts on the following rising edge of the source, as shown in Figure 7-36.
NI 6238/6239 User Manual
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Source
Figure 7-35. Other Internal Source Mode
Source
Delayed Source
Figure 7-36. External Source Mode
7-40
Synchronize Count
Synchronize
Count
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