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What are the Main Differences Between NI PXI-5620 and NI PXI-5621?

Hardware: Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5621, Modular Instruments>>High-Speed Digitizers (Scopes)>>PXI-5620

Since the PXI-5620 and PXI-5621 digitizers are very similar, how do I select the suitable digitizer for my application?

The table below lists the main differences between the PXI-5620 and the PXI-5621. In the related links sections below, there are links provided to the specifications documents for each device.

Device Differences PXI-5620 PXI-5621
Coupling AC DC
Maximum DC Input Voltage +/-2V +/-3V
Analog Bandwidth 10kHz to 36MHz 0Hz to 36MHz
Memory Options 32MB or 64MB 64MB

Primarily, the PXI-5620 is always AC coupled, while the PXI-5621 is always DC coupled. The PXI-5620 has a -3dB front end bandwidth from 10 kHz to 36 MHz, and is optimized to give the best possible noise and distortion performance in a passband from 5 to 25 MHz. The PXI-5621 doesn't have the same noise and distortion performance, but its front end admits signals to DC. The details regarding the noise and distortion performance of PXI-5620 and PXI-5621 can be found in their specification documents. In summary, you should use the PXI-5621 if the signal you want to acquire and analyze has frequency components below 10 kHz.

Related Links:
Product Manual: NI PXI-5620 Specifications
Product Manual: NI PXI-5621 Specifications
Specifications Explained: NI Oscilloscopes and Digitizers


Report Date: 10/07/2004
Last Updated: 10/04/2017
Document ID: 3E65L6FE

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