Discover motor performance,
without mechanical sensors.

Fluke 438-II Power Quality and Motor Analyzer

NEW FIRMWARE! Now supports measurements on variable frequency drives.

Troubleshoot 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.

    Request a product upgrade quote
    Request a demo

Why you should add motor analysis to your maintenance routine

Evaluating electrical, power quality and mechanical performance of electric motors can not only help predict failure it can help avert downtime—find out four keys to understanding motor efficiency and causes for failures.


Download the application note
Download product specifications

Download the full data sheet to learn more about mechanical metering functions, electric motor analysis capabilities, and key features of the new Fluke 438-II Power Quality and Motor Analyzer.

Download product specifications

Where to buy

You can always turn to our distributors and service centers for local assistance. They’ll help you with traceability, calibration, repair and self-maintenance.