The USB-5681 from National Instruments is a USB true RMS power meter that operates from 10 MHz to 18 GHz. It has a dynamic range from -40 to +20 dBm and a linearity of under ±0.18 dB. The device draws only 150 mA from the USB connection, making it highly suitable for mobile applications or adding to automated test applications to free up valuable rack space.

You can hardware-trigger the USB-5681 through an external trigger source or software-trigger it based on the signal source. Scope and slot modes use this software triggering to measure burst waveforms, such as WiMAX and LTE, and multislot waveforms, such as GSM and EDGE. The power meter is self-contained in a small form factor with calibration constants, including linearity and temperature corrections stored directly on the device. 

Product Specifications

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Product Details

  • Part Number
    NI USB-5681
  • Manufacturer
    National Instruments Corporation
  • Description
    USB True RMS Power Meter from 10 MHz to 18 GHz

General Parameters

  • Equipment Type
    Portable Power Meter
  • Power Measurements
    Average Power
  • Channels
    Single Channel
  • Frequency
    10 MHz to 18 GHz
  • Power Range
    -40 to 20 dBm
  • Impedance
    100 kO
  • Measurement Resolution
    0.01 dB
  • Return Loss
    19 to 22 dB

Technical Documents