Discover motor performance, without mechanical sensors: Fluke 438-II Power Quality and Motor Analyzer

January 3, 2019

Troubleshoot direct-on-line motors while in service, without mechanical sensors—so you don’t sacrifice uptime.

The 438-II Power Quality and Motor Analyzer can help troubleshoot power quality problems in three-phase and single-phase power distribution systems, while giving you the mechanical and electrical information you need effectively evaluate motor performance.

  • Measure key parameters on direct-on-line motors and motors driven by voltage sourced inverters (VFD) including torque, RPM and mechanical power
  • Calculate Mechanical Power and Efficiency without the need of mechanical sensors, while the motor is in service using three-phase input measurements
  • Perform dynamic motor analysis by plotting of motor de-rating factor against load according to NEMA guidelines

Fluke 434-II, 435-II and 437-II users can add these great motor analysis capabilities and features to their existing analyzers today with a product upgrade option. Existing 438-II users can upgrade their firmware to include the variable frequency drive enhancements at no cost on the Fluke website. Existing 438-II users can upgrade their firmware to include the variable frequency drive enhancements at no cost on the Fluke website. 

Related Articles

Editor’s Pick: Featured Article

Weidmüller’s u-control 2000: The Automation Controller

Weidmüller’s u-control 2000: The Automation Controller

Weidmüller’s scalable engineering software, u-control 2000, adapts individually to your requirements. And, the u-control is powerful, compact and fully compatible with Weidmüller’s I/O system u-remote. This article looks at what makes u-control the heart of your automation.

Programmable logic controllers (PLCs) are one of the main components of any automated system. A typical control system has inputs, outputs, controllers (i.e., PLCs), and some type of human interaction with the system, a human machine interface (HMI), for example.

Read More

Latest Articles

  • Smarter Power System Monitoring with Moxa Easy-to-Use Protocol Gateways

    November 27, 2025 Achieve Comprehensive Monitoring Across Diverse Energy Sources In industrial settings, effective power system monitoring plays a vital role in ensuring operational efficiency. It involves the real-time tracking of power quality, energy consumption, and equipment conditions. However, due to the varied nature of power grids, often composed of multiple energy sources and communication… Read More…

  • Understanding VFDs: The Technology Driving Smarter, More Efficient Systems 

    November 25, 2025 Variable Frequency Drives (VFDs) have become essential across modern industrial and commercial environments—but what makes them so valuable? A VFD, also known as an AC Drive or Inverter, is an electronic device that precisely controls the speed and torque of an AC motor. By adjusting the frequency and voltage supplied to the motor,… Read More…