National Instruments USB-6008 Guía De Seguridad Y Uso página 4

Signal Name
GND
AI <0..7>
AO <0, 1>
P0.<0..7>
P1.<0..3>
PFI 0
+2.5 V
+5 V
NI USB-6008/6009 Safety and Usage Guide
Reference Direction
— —
Varies Input
GND Output
GND Input or Output
GND Input or Output
GND Input
GND Output
GND Output
Ground—The reference point for the single-ended analog input
measurements, analog output voltages, digital signals, +5 VDC supply,
and +2.5 VDC at the I/O connector, and the bias current return point for
differential mode measurements.
Analog Input Channels 0 to 7—For single-ended measurements, each
signal is an analog input voltage channel. For differential measurements,
AI 0 and AI 4 are the positive and negative inputs of differential analog
input channel 0. The following signal pairs also form differential input
channels: <AI 1, AI 5>, <AI 2, AI 6>, and <AI 3, AI 7>.
Analog Output Channels 0 and 1—Supplies the voltage output of
AO channel 0 or AO channel 1.
Port 0 Digital I/O Channels 0 to 7—You can individually configure
each signal as an input or output.
Port 1 Digital I/O Channels 0 to 3—You can individually configure
each signal as an input or output.
PFI 0 —This pin is configurable as either a digital trigger or an event
counter input.
+2.5 V External Reference—Provides a reference for wrap-back
testing.
+5 V Power Source—Provides +5 V power up to 200 mA.
4
Description
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