Connecting Differential Voltage Signals; Analog Output - National Instruments PXIe-7862R User Manual

Connecting Differential Voltage Signals

You can connect grounded or floating differential signal sources to the NI PXIe-7862. Connect
the positive voltage signal to the AI+ and the negative voltage signal to AI-. To connect
grounded differential signals to the NI PXIe-7862, you must also connect the signal reference
to AI GND.
Figure 4. Connecting Grounded Differential Signals to the NI PXIe-7862
+
V
1
–
+
V
cm
–
To connect floating differential signals to the NI PXIe-7862, you must connect the negative
and positive signals to AI GND through 1 MΩ resistors to keep the voltage within the
common-mode voltage range. If the voltage source is outside the common-mode voltage
range, the NI PXIe-7862 does not read data accurately.
Figure 5. Connecting Floating Differential Signals to the NI PXIe-7862
+
V
1
–

Analog Output

The NI PXIe-7862 provides connections for eight analog output channels. Each channel has an
AO pin and AOGND pin to which you can connect a load.
AI+
AI–
AISENSE
AIGND
Connection
Accessory
AI+
AI–
AISENSE
AIGND
Connection
Accessory
Overvoltage
Protection
Overvoltage
Protection
Overvoltage
Protection
Overvoltage
Protection
Overvoltage
Protection
Overvoltage
Protection
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PGIA
ADC
NI PXIe-7862
PGIA
ADC
NI PXIe-7862