External Or Internal Source Less Than 25 Mhz - National Instruments DAQ X Series User Manual

Chapter 7 Counters

External or Internal Source Less than 25 MHz

With an external or internal source less than 25 MHz, 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 7-42.
Source
Synchronize
Delayed Source
Count
Figure 7-42. External or Internal Source Less than 25 MHz
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