NI R Series - Analog Input; Connecting Single-Ended Voltage Signals

Analog Input
The NI PXIe-7858R provides connections for eight AI channels. Each channel has an AI+ pin,
AI- pin, and AIGND pin to which you can connect both single-ended or differential voltage
signals. Use the AISENSE pin to connect non-referenced single-ended signals.
Connecting Single-Ended Voltage Signals
To connect referenced single-ended voltage signals to the NI PXIe-7858R, you must connect
the voltage ground signal to AI GND in order to keep the common-mode voltage in the
specified range.
Figure 2. Connecting Referenced Single-Ended Signals to the NI PXIe-7858R
PGIA
ADC
AI+
NI PXIe-7858R
Connection
Accessory
AISENSE
AIGND
V
1
+
–
Overvoltage
Protection
AI–
Overvoltage
Protection
Overvoltage
Protection
To connect non-referenced single-ended voltage signals to the NI PXIe-7858R, you must
connect the voltage ground signal to AI SENSE in order to keep the common-mode voltage in
the specified range.
Figure 3. Connecting Non-Referenced Single-Ended Signals to the NI PXIe-7858R
PGIA
ADC
AI+
NI PXIe-7858R
Connection
Accessory
AISENSE
AIGND
V
cm
V
1
+
–
+
–
Overvoltage
Protection
AI–
Overvoltage
Protection
Overvoltage
Protection
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