National Instruments NI cDAQ-9181 User Manual

5-40 | ni.com
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
Delayed Source
Synchronize
Count

National Instruments NI cDAQ-9181 Specifications

General

Brand	National Instruments
Model	NI cDAQ-9181
Category	Chassis
Language	English