Electrical power quality and mechanical measurements in a single, easy-to-use test tool

The Fluke 438-II Power Quality and Motor Analyzer gives users the ability to measures power quality in detail while simultaneously performing key motor performance analysis including efficiency and shaft mechanical power measurements. You can quickly and easily discover the effect of power quality or loads on your motor performance and a direct readout of mechanical motor measurements allows you to correctly size the motor for current operating conditions or take actions to prevent failures.

• Measure key parameters like speed, torque and mechanical power without mechanical sensors all while the motor is in service simply by using three-phase input measurements

• Calculate Mechanical Power and Efficiency without the need of mechanical sensors

• Automatically calculate motor derating according to NEMA/IEC guidelines

Motor torque

Calculates the amount of rotational force (displayed in lb.ft or Nm) developed by a motor and transmitted to a driven mechanical load. The motor torque is the single most critical variable that characterizes the instantaneous mechanical performance of rotating equipment driven by electric motors.

Motor speed

Provides the instantaneous motor shaft rotational speed. Combined with the motor torque, motor speed provides a snapshot of the mechanical performance of rotating equipment driven by electric motors.

Motor mechanical load

Measures the actual mechanical power (displayed in hp or kW) produced by motors and provides a direct link to overloading conditions without simply basing it on the motor current.

Motor efficiency

Shows the effectiveness of each motor within a machine, assembly line, plant, and/or facility in converting electric power to useful mechanical work. By properly aggregating the efficiencies of a population of motors the total (aggregate) efficiency can be estimated. Comparisons to expected motor efficiencies at observed operating conditions can help quantify the cost associated with motor energy inefficiency.

How it works

Using proprietary algorithms, the Fluke 438-II Power Quality and Motor Analyzer uses three-phase current and voltage waveforms to calculate motor torque, speed, load and efficiency at a 1 second update rate. The motor air gap field, as observed via the voltage/current waveforms, provides the basis for the measurements. Mechanical sensors and intrusive no-load motor testing are not required, making it faster than ever to analyze overall electric motor performance.