Analog Input; Connecting Single-Ended Voltage Signals - National Instruments PXIe-7856R User Manual

Analog Input

The NI PXIe-7856R 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-7856R, 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-7856R
+
V
1
–
To connect non-referenced single-ended voltage signals to the NI PXIe-7856R, 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-7856R
+
V
1
–
+
V
cm
–
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AI+
AI–
AISENSE
AIGND
Connection
Accessory
AI+
AI–
AISENSE
AIGND
Connection
Accessory
Overvoltage
Protection
Overvoltage
Protection
Overvoltage
Protection
Overvoltage
Protection
Overvoltage
Protection
Overvoltage
Protection
PGIA
ADC
NI PXIe-7856R
PGIA
ADC
NI PXIe-7856R