National Instruments NI 7831R User Manual

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Contents

National Instruments NI 7831R User Manual Manual pdf 41 page image

Chapter 2 Hardware Overview of the NI 7831RNI 7831R User Manual 2-22 ni.com4. Reinsert the NI 7831R into the PXI/CompactPCI chassis or PCIcomputer. Refer to the Installing the Hardware section of the GettingStarted with the NI 7831R document for installation instructions.5. Plug in and power on the PXI/CompactPCI chassis or PCI computer.After completing this procedure, a VI stored in flash memory does not loadto the FPGA at power-on. You can use software to configure the NI 7831Rif necessary. To return to the defaults of loading from flash memory, repeatthe previous procedure but return switch 1 to the OFF position in step 3.You can use this switch to enable/disable the ability to load from flash. Inaddition to this switch, you must configure the device with the software toautoload.Note When the NI 7831R is powered on with switch 1 in the ON position, the analogcircuitry does not return properly calibrated data. Move the switch to the ON position onlywhile you are using software to reconfigure the NI 7831R for the desired power-upbehavior. Afterward, return switch 1 to the OFF position.Power ConnectionsTwo pins on each I/O connector supply 5 V from the computer powersupply using a self-resetting fuse. The fuse resets automatically within afew seconds after the overcurrent condition is removed. The +5V pins arereferenced to DGND and can power external digital circuitry. TheNI 7831R has the following power rating:+4.50 to +5.25 VDC at 1 A (250 mA max per +5V pin, 1 A max total forall +5V lines on the device)Caution Do not connect the +5V power pins directly to analog or digital ground or to anyother voltage source on the NI 7831R or any other device under any circumstance. Doingso can damage the NI 7831R and the computer. NI is not liable for damage resulting fromsuch a connection.