The LB5940L 9 kHz to 40 GHz True RMS Power Sensor

The LB5940L True RMS Power Sensor is a high-performance RF and microwave power measurement solution that provides reliable, accurate power readings from 9 kHz to 40 GHz. Engineered for both benchtop and automated test environments, this sensor offers accurate RMS detection, capturing average power of CW, modulated, and pulsed signals across a broad dynamic range.With USB connectivity, high-speed data acquisition, and intuitive software support, the LB5940L is ideal for communications, aerospace, defence, and general-purpose RF testing engineers. Its compact form factor and plug-and-play functionality make it a powerful tool for both lab use and field diagnostics.
Recommended for average power measurements on signals of any modulation type including: 802.11ac, gsm, cdma 2000, CDMA (IS-95), TDMA, Multi-Tone, OFDM, CW, QAM and more.

Extensive Frequency Coverage: Spanning from 9 kHz to 40 GHz, it supports various RF and microwave applications.

Accurate RMS Detection: For comprehensive signal analysis, measures average power of all waveform types—CW, pulsed, and modulated.

Wide Dynamic Range: Accurately detects power from -60 to +20 dBm, supporting low-level signals and high-power sources.

Fast Measurement Speed: High sampling rate allows real-time monitoring and faster test cycle execution.

USB Powered & Controlled: No external meter is required. It connects directly to a PC or laptop via USB for instant setup.

Portable & Lightweight: Compact design for use in the field or on crowded lab benches without sacrificing performance.

Software Included: Comes with user-friendly software for measurement visualisation, data logging, and automation scripting.

Parameter	Details
Frequency Range	9 kHz to 40 GHz
Power Measurement Range	-60 dBm to +20 dBm (typical)
Detection Type	True RMS
Dynamic Range	80 dB (typical)
Measurement Accuracy	±0.25 dB typical
Interface	USB 2.0
Power Supply	Powered via USB (no external PSU needed)
Dimensions	Compact sensor body (approx. 100 mm in length)
Compatible OS	Windows-based software included

Telecommunications & 5G: Validate signal integrity and power levels in high-frequency wireless systems and RF chains.

Aerospace & Defence: Perform accurate radar, EW systems, and satellite communications power measurements.

IoT and Embedded RF: Analyse power consumption and performance of embedded RF modules and wireless devices.

Production & QA Testing: Easily integrate into ATE systems to ensure compliance and performance across RF products.

R&D Laboratories: Versatile enough for various measurement needs—from signal characterisation to system validation.

The LB5940L 9 kHz to 40 GHz True RMS Power Sensor

Key Features

Specifications

Applications