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Summary of Contents for NI PXIe-7861
- Page 1 PXIe-7861 Features 2024-03-20...
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Page 2: Table Of Contents
NI PXIe-7861 User Manual........ -
Page 3: Ni Pxie-7861 User Manual
© 2018 National Instruments Corporation. All rights reserved. Refer to the <National Instruments>\_Legal Information directory for information about NI copyright, patents, trademarks, warranties, product warnings, and export compliance. Hardware Overview The following high-level block diagram represents the NI PXIe-7861. Figure 1. NI PXIe-7861 Block Diagram 100 MHz Flash... - Page 4 TERMINAL 34 TERMINAL 1 TERMINAL 34 TERMINAL 1 TERMINAL 35 TERMINAL 68 TERMINAL 68 TERMINAL 35 Table 1. NI PXIe-7861 Signal Descriptions Signal Description Positive analog input signal connection Negative analog input signal connection AISENSE Reference connection for NRSE measurements AIGND...
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Page 5: Connectivity Options
VHDCI (2 m) Analog Input The NI PXIe-7861 provides connections for 16 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. -
Page 6: Connecting Differential Voltage Signals
NI PXIe-7861 Connecting Differential Voltage Signals You can connect grounded or floating differential signal sources to the NI PXIe-7861. Connect the positive voltage signal to the AI+ and the negative voltage signal to AI-. To connect grounded differential signals to the NI PXIe-7861, you must also connect the signal reference to AI GND. -
Page 7: Analog Output
Accessory NI PXIe-7861 To connect floating differential signals to the NI PXIe-7861, 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-7861 does not read data accurately. -
Page 8: Field Wiring Considerations
When the system powers on, the DIO channels are set as input low with pull-down resistors. To set another power-on state, you can configure the NI PXIe-7861 to load a VI when the system powers on. The VI can then set the DIO lines to any power-on state. -
Page 9: +5 V Power Source
Separate NI PXIe-7861 signal lines from high-current or high-voltage lines. ■ These lines can induce currents in or voltages on the NI PXIe-7861 signal lines if they run in parallel paths at a close distance. To reduce the magnetic coupling between lines, separate them by a reasonable distance if they run in parallel or run the lines at right angles to each other. -
Page 10: Ni Services
Caution Never connect the +5 V power terminals to analog or digital ground or any other voltage source on the NI PXIe-7861 or any other device. Doing so can damage the device and the computer. National Instruments is not liable for damage resulting from such a connection.
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