niScope Acquire Large Record, Fetch to Binary

This VI acquires a large single record at a high sample rate, informs the user that the data has been acquired, fetches the data out in a loop and writes it to a binary file.

Example: Acquire Large Record, Fetch to Binary

 

Recommended Input Signal: 1MHz, 4 Vpp, sine wave

 

Devices Supported: NI 5620, NI 5621, NI 5122, NI 5124, NI 5114, NI 5142 (562x devices require configuration of a 2 V vertical range, 50 ohm input impedance and appropriate vertical coupling). If the NI 5102, NI 5112, NI 5922, NI 5911 are used, the fetch VI should be changed to match the size of the incoming sample (8 or 32 bits).

 

This VI acquires a large single record at a high sample rate, informs the user that the data has been acquired, fetches the data out in a loop and writes it to a binary file. This example differs from most other installed niScope examples (such as niScope EX Configured Acquisition, niScope EX Save to File, niScope EX Measurement Library) because it takes one large single record of several megabytes while most other examples acquire a single record of a few kilobytes, fetch from that record, and then fill it again in a loop repeatedly. The advantage of this example is that the single record is continuous in time, whereas other examples represent chunks of noncontiguous data. A common use case is to acquire an event at the maximum sample rate of the digitizer until the onboard memory is full and then fetch it out. If a high sample rate is not needed (< ~10MS/s) then the user should use the installed example, niScope EX Fetch Forever, which allows continuous streaming to disk at low sample rates. If the user prefers to let the NI SCOPE driver to perform a measurement (FFT, filtering, histogram, max/min, etc.) then please refer to the web example niScope Acquire Large Record, Fetch with Measurement to HWS.

 

Read Binary File with Filtering.vi can be used to read the resulting binary file. The filtering can be optionally applied.

 

Requirements

Filename: acquire_lrge_binary.zip

Software Requirements

Application Software: LabVIEW Full Development System 8.2
Language(s): LabVIEW

Hardware Requirements

Hardware Group: High-Speed Digitizers (Scopes)
Hardware Model: PCI-5102, PCI-5112, PCI-5114, PCI-5122, PCI-5124, PCI-5142, PXI-5142, PCI-5922, PXI-5102, PXI-5112, PXI-5114, PXI-5122, PXI-5124, PCI-5911
Driver: NI-SCOPE 3.2

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