National Instruments DAQ M Series - Manual (Page 25)

© National Instruments Corporation 4-1 NI 6236 User Manual
4
Analog Input
Figure 4-1 shows the analog input circuitry of NI 6236 devices.
Figure 4-1. NI 6236 Analog Input Circuitry
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 depends on the
analog input ground-reference settings, described in the
Analog Input
Ground-Reference Settings section. Also refer to Appendix A, NI 6236
Device Information , for device I/O connector 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
for all input ranges. The NI-PGIA can amplify or attenuate an AI signal to
ensure that you use the maximum resolution of the ADC.
I/O Connector
AI <0..3>+
AI GND
NI-PGIA
Input Range
Selection
ADC AI Data
Isolation
Barrier
Digital
Isolators
AI FIFO
AI <0..3>–
Mux