How Do I Measure the Dynamic Range of My Data Acquisition Device?Hardware: Legacy DAQ Devices>>Multifunction DAQ, Modular Instruments>>Dynamic Signal Acquisition and Analysis (DSA), Multifunction DAQ (MIO)
Problem: How Do I Measure the Dynamic Range of My Data Acquisition Device? Solution: The dynamic range of a DAQ device is the ratio of the highest signal level to the smallest signal level a circuit can measure (usually equal to the noise floor), normally expressed in dB. One approximation of the Dynamic Range is the dB equivalent of Idle Channel Noise which you can find using the following method:
Note: The industry standard (and SVMS Dynamic Range SubVI) technically requires a high quality -60dB input tone instead of a terminated input channel. For most NI devices you get the same number using either method. Attached are a VI and an Executable which perform this functionality. If you have a Development Version of LabVIEW (8.5 or later) you may open the VI and view the source code. If you do not have the Development Version of LabVIEW you may download the Executable and run it using the LabVIEW 8.6 run-time available here. Related Links: Drivers and Updates: LabVIEW Run-Time Engine 8.6 KnowledgeBase 3V9BSR8T: How Do I Calculate the Dynamic Range of My C Series Module or DAQ Device? Developer Zone Tutorial: Spec Study: Dynamic Range KnowledgeBase 2N8D0BN5: What is Spurious-Free Dynamic Range? Attachments:  Dynamic Range.viDynamic Range.zip
Report Date: 05/04/2009 Last Updated: 11/06/2009 Document ID: 4X31Q728 |
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