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
PGIA
ADC
AI+
NI PXIe-7862
Connection
Accessory
AISENSE
AIGND
V
cm
V
1
+
–
+
–
Overvoltage
Protection
AI–
Overvoltage
Protection
Overvoltage
Protection
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
PGIA
ADC
AI+
NI PXIe-7862
Connection
Accessory
AISENSE
AIGND
V
1
+
–
Overvoltage
Protection
AI–
Overvoltage
Protection
Overvoltage
Protection
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.
NI PXIe-7862 User Manual
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© National Instruments
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Summary of Contents for PXIe-7862R
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