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National Instruments · USB

USB-5681

The National Instruments USB-5681 is a USB-connected true-RMS RF power sensor covering 10 MHz to 18 GHz. It measures average RF power over an input range of -40 to +20 dBm.

ManufacturerNational Instruments
ModelUSB-5681
Part Number199764-01
Product TypeTrue-RMS RF power sensor
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Frequency coverage10 MHz to 18 GHz
Input range-40 to +20 dBm
DetectionTrue RMS
SoftwareNI-568x driver and Soft Front Panel
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Overview

Product overview

Key product information and technical features.

The USB-5681 belongs to NI's RF power sensor device family. NI identifies assembly 199764-01 as the USB-5681 true-RMS RF power sensor.

NI-568x provides an instrument driver for programmed operation and a Soft Front Panel for interactive use. The NI-568x 20.0 readme explicitly lists USB-5681 support.

  • True-RMS RF power sensing.
  • Continuous, scope, and time-slot measurement modes.
  • Immediate, external, internal, and software trigger sources, subject to mode and software restrictions.
  • Interactive operation through the NI-568x Soft Front Panel.
Verified specifications

Technical data

Verified product specifications.

Frequency range10 MHz to 18 GHz
Input range-40 to +20 dBm
MeasurementAverage power
Measurement resolution0.01 dB
Signal-channel bandwidth50 kHz
Typical current from 5 V host USB450 mA
Condition & included items

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Compatibility

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National Instruments

Manufacturer

USB

Host connection

USB-5681

RF power sensor

Control software

NI-568x instrument driver or Soft Front Panel

Check the selected NI-568x release documentation for operating-system and development-environment support.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

USB-5681 SpecificationsSpecifications · download.ni.com
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NI-568x 20.0 ReadmeDriver Release Documentation · ni.com
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USB-5681 Product CertificationsProduct Certifications · ni.com
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USB-5681 Specifications and Trigger RestrictionsTechnical resource
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Shipping, warranty & returns

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Warranty
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Returns
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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Which software supports the USB-5681?

NI-568x 20.0 explicitly supports the USB-5681 and provides an instrument driver and Soft Front Panel. Consult that release's readme for supported software environments.

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