Oscillating Analog Output Signal from PCI-6704 Hardware: Signal Sources (AWG/FG/AO)>>Analog Output Devices>>PCI-6704, Signal Sources (AWG/FG/AO)>>Analog Output Devices>>PXI-6704
Problem: I am using a PCI-6704 board to drive my external circuit. When I output 5 volts to my circuit, the output signal measures 4.4 volts. If I measure the value of my analog output signal when the card is not connected to my external device, I measure the expected 5 volts. Why do I see a discrepancy with the voltage output signals from my PCI-6704 board? Solution: The voltage outputs on the PCI-6704 are driven by op-amps, which can yield inductive output impedance. Your circuit may be oscillating and railing if the load capacitance of your external circuit exceeds the maximum load capacitance of 10,000 pF. For more specifications for the PCI-6704, please reference the NI 6703/6704 User Manual located in the Related Links section. Related Links: Product Manuals: NI 6703/6704 User Manual (February 2005) KnowledgeBase 1O2DHT7T: What Is the Accuracy of the PCI-6704? Attachments:
Report Date: 10/23/2006 Last Updated: 01/02/2008 Document ID: 42MGR6QP |
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