Analog Input; Analog Input Circuitry - National Instruments PXI-6238 User Manual

Analog Input

Figure 4-1 shows the analog input circuitry of NI 6238 and NI 6239
devices.
AI <0..7>+
Mux
AI Terminal
Configuration
AI <0..7>–
Selection
AI GND

Analog Input Circuitry

I/O Connector
You can connect analog input signals to the M Series device through the I/O
connector. The proper way to connect analog input signals is outlined in the
Connecting Analog Current Input Signals
Appendix A,
pinouts.
MUX
Each M Series device has one analog-to-digital converter (ADC). The
multiplexers (MUX) route one AI channel at a time to the ADC through the
NI-PGIA.
Instrumentation Amplifier (NI-PGIA)
The NI programmable gain instrumentation amplifier (PGIA) is a
measurement and instrument class amplifier that minimizes settling times
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Isolation
NI-PGIA ADC
Isolators
Input Range
Selection
Figure 4-1. NI 6238/6239 Analog Input Circuitry
Device-Specific Information, for device I/O connector
4-1
4
Barrier
Digital
AI FIFO
AI Data
section. Also refer to
NI 6238/6239 User Manual