How to Read Onboard Memory Size of a Modular Instrument Primary Software: LabVIEW Development Systems>>Professional Development SystemPrimary Software Version: 7.1 Primary Software Fixed Version: N/A Secondary Software: Driver Software>>NI-SCOPE Hardware: Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5122
Problem: I have a modular instrument (signal source, digitizer, or high-speed digital), but I'm not sure how much memory is on it. How can I find out? Solution: The total onboard memory available to any Modular Instrument can be found using a Property Node. The specific location of the property varies among types of devices, so the node must connected to a driver session first. The following picture illustrates each type of property node and the full property name.
Digitizers (NI-SCOPE) The property is called Memory Size and is located in the Horizontal category. Remember that the total onboard memory is reported, and this is divided between the two channels in your device. So the onboard memory per channel is actually half this value. High-Speed Digital (NI-HSDIO) Since the memory banks are not shared, there are two properties: one for acquisition memory, and one for generation memory. They are called Total Acquisition/Generation Memory Size and are located in the Device Characteristics category. Remember that the number of samples that can be acquired is a function of the Data Width and Data Rate. For instance, an NI 6551 acquisition with Data Width = 4 (32 bits per sample) will be able to acquire one fourth as many samples as an acquisition with Data Width = 1 (8 bits per sample). Arbitrary Waveform Generators (NI-FGEN) The Memory Size property is found in the Instrument Specific Attributes category Related Links: Finding Onboard Memory of a Modular Instrument Attachments:  - PropertyNodes.png
Report Date: 09/20/2006 Last Updated: 12/18/2006 Document ID: 41JBNSTT |
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