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4
PFI 0 and Digital Input
Measurements
This chapter covers many topics associated with taking digital input and PFI 0 measurements
and generating PFI 0 signals, including how to condition signals by adding components to the
open component locations of the SCB-68A for lowpass filtering and attenuating voltage
applications.
Caution Add components at your own risk. NI is not liable for any damage
resulting from improperly added components.
In addition to the applications described in this chapter, you can build many other types of signal
conditioning using the component pads and the general-purpose breadboard area of the
SCB-68A. Refer to the Soldering and Desoldering Components on the SCB-68A section of
Chapter 1, Getting Started with the SCB-68A, for more information about adding components
and for soldering and desoldering instructions.
After building one of the applications described in this chapter or your custom circuitry, refer to
the Setting up the SCB-68A section of Chapter 1, Getting Started with the SCB-68A, for
instructions about how to configure the SCB-68A in Measurement & Automation Explorer
(MAX). You can create virtual channels in MAX to create a custom scale or map your voltage
ranges to the type of transducer that you use.
PFI 0 Channel Pad Configuration
When you use the SCB-68A with a 68-pin or 100-pin MIO DAQ device, you can use the SC10
component pads on the SCB-68A to condition PFI 0. Figure 4-1 shows the digital trigger
circuitry for PFI 0.
Figure 4-1. Digital Trigger Circuitry
B
PFI 0/AI START TRIG
(I/O Pin 11)
A
D GND
(I/O Pin 44)
PFI 0/AI START TRIG
Screw Terminal
D GND Screw Terminal
SC10
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