Chapter 2 Configuration and Installa tion
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National Instruments Corporation 2-9 AT-MIO-16X User Manual
RSE Input (16 Channels)RSE input means that all input signals are referenced to a common
ground point that is also tied to the analog input ground of the
AT-MIO-16X board. The negative (–) input of the differential input
amplifier is tied to the analog ground. This configuration is useful when
measuring floating signal sources. Se e t he Type s of Signal So urces
section later in this chapter for more information. With this input
configuration, the AT-MIO-16X can monitor up to 16 different analog
input signals. This configuration is selected via software. See the
configuration memory register and Table 4-9 in Chapter 4, Regi st er
Map and Descriptions. The results of this configuratio n ar e as fo llow s:
• The negative (–) input of the PGIA is tied to the PGIA signal
ground.
• Multiplexer outputs are tied together into the positive (+) input
of the PGIA.
• Multiplexer control is configured to control up to 16 input
channels.
• AI SENSE may be drive n b y th e boa rd ana log inpu t gr oun d or
left unconnected.
Considerations for using the RSE configuration are discussed in the
Signal Connections section later in this chapter. Figure 2-18 shows
a schematic diagram of this configuration.
NRSE Input (16 Channels)NRSE input means that all input signals are referenced to the same
common-mode voltage, but this common-mode voltage can float
with respect to the analog ground of the AT-MIO-16X board. This
common-mode voltage is subsequently subtracted from the signals
by the input PGIA. This configuration is useful when measuring
ground-referenced signal sources. See the Types of Signal Sources
section later in this chapter for more information. With this input
configuration, the AT-MIO-16X can measure up to 16 different an alog
input signals. This configuration is selected via software. See the
configuration memory register and Table 4-9 in Chapter 4, Regi st er
Map and Descriptions, for additional information. The results of this
configuration are as follows:
• AI SENSE is tied into the negative (–) input of the PGIA.
• Multiplexer outputs are tied together into the positive (+) input
of the PGIA.