A Guide to LadyBug LB5900 Series True RMS Sensors

by Ladybug

LadyBug Technologies has been at the forefront of the power sensor technology since its inception. The company designs, manufactures, and delivers various types of first tier NIST traceable USB power sensors. The power sensors are organized under three categories— True RMS Sensors, Peak, Pulse and Averaging Sensors, and Wideband Pulse Profiling Sensors. Our sensors are made in the USA.

The LB5900 Series True RMS power sensors are an excellent choice for making general purpose average power measurements. This post explains some of the features of the LB5900 Series True RMS Power Sensors.

LB5900 Series True RMS Power Sensors:

These are two path diode sensors, which provide accurate power measurements on any signal. The following features of these sensors make them one of the best in the industry.

  • Patented No-Zero, No-Calibration Before Use: Ladybug’s no-zero, no-calibration technology means you will receive accurate measurements all the way down to the sensors noise floor without zeroing the sensor before use.
    The sensor constantly adjusts the calibration data based on the environmental conditions. It continuously selects the calibration data to maintain first tier NIST traceable accuracy. It requires no user zeroing or calibration before use. However, annual calibration is recommended.
  • Best Thermal Stability: Ladybug sensors feature patented technology that stabilizes the sensor and eliminates thermal drift. These sensors are calibrated across the entire operating temperature range. Other sensors stop to self-calibrate, however Ladybug’s sensors simply continue with measurements by selecting the appropriate calibration data for the conditions dynamically. These sensors will not interrupt ATE systems for zeroing.
  • Available in Various Frequency Ranges: The power sensors in the series are provided in frequency ranges from 9 kHz to 44 GHz with 80 DB of dynamic range. So, they perfectly meet your application requirements across a wide range of frequencies. They are:
    1. LB5908A: 1 MHz to 8 GHz
    2. LB5908L: 9 kHz to 8 GHz
    3. LB5912A: 1 MHz to 12 GHz
    4. LB5918A: 1 MHz to 18 GHz
    5. LB5926A: 1 MHz to 26.5 GHz
    6. LB5926L: 9 kHz to 26.5 GHz
    7. LB5940A: 1 MHz to 40 GHz
    8. LB5940L: 9 kHz to 40 GHz
    9. LB5944A: 1 MHz to 44 GHz
  • Flexible Interface: These LB5900 Series True RMS Power Sensors feature a dual USB Interface, and enumerates both a USB HID (Human Interface Class) and USB TMC (Test & Measure Class). This combination allow you to use most computers or your favorite VISA I/O libraries. Also, Option SPI includes serial peripheral interface (SPI) or Inter Integrated Circuit (I2C), TTL connections that enable you to connect directly to the sensor from a microcontroller, FPGA, or other device. This helps eliminate the problems of locked up PCs and other operating system issues by connecting directly to the fully self-contained- sensor. This allows for a construction of small test sets that require accurate power measurements.
  • Autonomous Unattended Operation: Option UOP (Unattended Operation), allows the sensor to make and store measurements with no computer attached. The sensor can store up to 50 million measurements. There is a highly accurate time base and each measurement is time-stamped. No computer is necessary, and you only need to supply power.
  • Supplied Software: The sensors are supplied with PMA 12, is a full featured Windows power meter application. The software includes a Logger, Strip Chart, Analog Meter Display and much more. An Interactive IO with its source code is also provided doe ATE users. This power sensor interface also supports various drivers and applications including. PMA-12 is Windows based, however these power sensors are Linux compatible for ATE applications.
  • Analog Output: Option 001, Recorder Out provides a scalable, calibrated, 0 to 1 volt analog output. PMA-12 can be used to set up the output. The Analog Output can be used with no computer attached if desired. This allows accurate power measurements to be delivered in portable autonomous systems.

LadyBug Technologies’ goal is to provide the very best in performance while delivering cost effective solutions. We have a technical sales and support team that you can speak with regarding measurements, power sensor selection, ATE software or any other questions you many have regarding power measurements.

Visit or downloads section to view the data sheet for any of our sensors. You can also get in touch with the team today at 707-546-1050 or visit our video page for more information.