National Instruments SCB-68 Special Consideration for Digital Trigger Input Signals

Chapter 5 Adding Components forSpecial Functions
© National Instruments Corporation 5-15 SCB-68 Shielded Connector Block User Manual
Figure 5-15. Lowpass Filtering of AO Signals
Special Consideration for Digital Trigger Input Signals
Lowpass filters can function as debouncing filters to smooth noise on
digital trigger input signals, thus enabling the trigger-detection circuitry of
the DAQ device to understand the signal as a valid digital trigger.
Figure 5-16. Digital Trigger Input Signal with a High-Frequency Component
Time (t)
Volts (V)
Time (t)
Volts (V)
TTL Logic
High
TTL Logic
Low