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Is There a Minimum Sample Rate for NI High-Speed Digitizers?



Hardware: Modular Instruments>>High-Speed Digitizers (Scopes), Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5922, Modular Instruments>>High-Speed Digitizers (Scopes)>>AT-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>DAQCard-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>USB-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>DAQPad-5112 for IEEE 1394, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5112, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5122, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5124, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5911, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5102, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5112, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5122, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5124, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5152, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5620, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5621, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5911, Modular Instruments>>High-Speed Digitizers (Scopes)>>PCI-5922

Problem:
What is the minimum sampling rate for NI High-Speed Digitizers?

Solution:
All National Instruments High-Speed Digitizers are able to use a decimation method to achieve a sampling rate lower than the maximum sampling rate for the ADC. This is done by dividing the maximum sampling rate by some integer value n. The maximum value of n is different for each digitizer and thus the minimum sampling rate is different.

The minimum sampling rate can always be found in the product specification sheet, generally under "Sample Rate Range". On some specification sheets it is listed under "Real-Time Sampling" or "Minimum Sample Rate". See the screenshot below for the sampling rate range of the NI 5124. All High-Speed Digitizer Specification sheets are linked below.



If the minimum sample rate is not suitable for your application then you may consider using an external sample clock. This external sample clock is used to replace the onboard clock (the VCXO) for synchronization or to achieve a sampling rate that cannot be specified by using the onboard clock. Some devices can also decimate the external sample clock to achieve a sampling rate that is an integer divisor of the external sample clock. For example, if the external sample clock is 70 MHz, you could decimate the clock by a factor of 2 and achieve a 35 MS/s sampling rate.

For more information about Sample Clock and decimation, refer to the NI High-Speed Digitizers Help.

Related Links:
Specifications Explained: NI Oscilloscopes and Digitizers
Product Manuals: NI High-Speed Digitizers Help
Product & Services: High-Speed Digitizers Home Page
Product Manuals: NI 5102 Specifications
Product Manuals: NI 5112 Specifications
Product Manuals: NI PXI/PCI-5114 Specifications
Product Manuals: NI PXI/PXIe/PCI-5122 Specifications
Product Manuals: NI PXI/PCI-5124 Specifications
Product Manuals: NI PXI-5620 Specifications
Product Manuals: NI PXI-5621 Specifications
Product Manuals: NI PCI-5911 Specifications
Product Manuals: NI PXI/PCI-5922 Specifications

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Report Date: 08/24/2005
Last Updated: 10/04/2017
Document ID: 3ON9JAOY

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