Fluke 438-II Specifications

TECHNICAL DATA

Fluke 438-II Power Quality
and Motor Analyzer

Quickly and easily discover electrical and
mechanical performance of electric motors, and
evaluate power quality with a single test tool

The new Fluke 438-II Power Quality and Motor Analyzer adds key
mechanical measurement capabilities for electric motors to the
advanced power quality analysis functions of the Fluke 430 Series
II Power Quality Analyzers. Quickly and easily measure and ana­lyze key electrical and mechanical performance parameters such as
power, harmonics, unbalance, motor speed, torque and mechanical
power without the need of mechanical sensors.

The ideal portable motor analysis test tool, the 438-II can help
locate, predict, prevent, and troubleshoot power quality problems
in three-phase and single-phase power distribution systems, while
giving technicians the mechanical and electrical information they
need to effectively evaluate motor performance.

• Measure key parameters on direct-on-line motors including
torque, RPM, mechanical power and motor efficiency

• Perform dynamic motor analysis by plotting of motor de-rating
factor against load according to NEMA guidelines

• Calculate mechanical power and efficiency without the need of
mechanical sensors, just connect to the input conductors and
you’re ready to go

• Measure electrical power parameters such as voltage, current,
power, apparent power, power factor, harmonic distortion and

KEY MEASUREMENTS

Electrical power, harmonics, unbalance,
motor speed, torque and mechanical
power without the need of mechanical
sensors.

FLUKE CONNECT® CO M PATI B L E*

View data locally on the instrument,
via Fluke Connect mobile app and
PowerLog 430-II desktop software.

SAFETY RATED FOR INDUSTRIAL
APPLICATIONS

600 V CAT IV/1000 V CAT III rated
for use at the service entrance and
downstream

unbalance to identify characteristics that impact motor efficiency

• Identify power quality issues such as dips, swells, transients,
harmonics and unbalance

• PowerWave data technology captures fast RMS data, and shows
half-cycle averages and waveforms to characterize electrical
system dynamics (generator start-ups, UPS switching etc.)

• Waveform capture function captures 100/120 cycles (50/60 Hz) of
each event detected event, in all modes, without set-up

• Automatic transient mode captures waveform data at 200 kS/s on
all phases simultaneously up to 6 kV.

* Not all models are avai lable in al l countries. Check with

your local Fluke representative.

Fluke 438-II mechanical metering
functions

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.

Quick and easy measurement setup

Simply hookup the voltage measurement leads and
flexible current probes to the service supplying the
motor.

How it works

Using proprietary algorithms, the Fluke 438-II
Power Quality and Motor Analyzer uses three­phase 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 is
not required, making it faster than ever to analyze
overall electric motor performance.

2 Fluke Corporation Fluke 438-II Power Quality and Motor Analyzer

Input details of the motor from the rating plate
including rated power, rated speed and motor type
from either NEMA or IEC classifications.

Note: Measurement units can be set to local
requirements hp/kW, lb ft/Nm etc.