Can I Use an External Clock with My DSA Device? Hardware: Modular Instruments>>Dynamic Signal Acquisition and Analysis (DSA)
Problem: Can I use an external clock with my NI 4472 devices? Solution: No, you cannot use an external clock with a DSA device (NI 446x, 447x, 445x or 455x). This however does not prevent you from synchronizing your DSA device with another data acquisition device. An external clock cannot be used with a DSA device because the DSA device requires an oversample clock of either 128x or 256x the actual sample rate. The oversample clock is necessary for the delta-sigma converter architecture and is what allows the DSA device to achieve such high resolution (24-bits). Synchronizing DSA Devices You can synchronize multiple DSA devices, M-Series, and E-Series devices together. This DSA oversample clock is generated onboard the device, but it can also be exported to other devices through the PXI Star Trigger line or over RTSI. Exporting the oversample clock is most commonly done when synchronizing several DSA devices together, but other devices such as counters or multifunction devices (E or M-Series) can also access the oversample clock to synchronize with the DSA devices. For more information on synchronizing DSA, M-Series, and E-series devices, please refer to the Related Link below. Related Links: KnowledgBase [3EE7N2NQ]: Synchronization with Dynamic Signal Acquisition (DSA) Products with DAQmx Attachments:
Report Date: 09/28/1998 Last Updated: 03/16/2007 Document ID: 1DRF9C0O |
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