External Or Internal Source Less Than 20 Mhz - National Instruments NI cDAQ-9181 User Manual

Chapter 5 Counters

External or Internal Source Less than 20 MHz

With an external or internal source less than 20 MHz, the module generates a delayed Source
signal by delaying the Source signal by several nanoseconds. The chassis 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 5-39.
Figure 5-39. External or Internal Source Less than 20 MHz
Source
Synchronize
Delayed Source
Count
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