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3 Fluke Corporation Fluke 438-II Power Quality and Motor Analyzer
Electrical motor analysis
The Fluke 438-II provides a complete breakdown
of electrical parameters. Prior to beginning motor
analysis, it’s recommended to make base line
power quality measurements to assess the state of
harmonics and unbalance on the electrical service
output as these two properties can have a serious
negative impact, on motor performance.
When in Motor Analysis mode, results are sum-
marized for electrical performance, mechanical
performance and derating (according to NEMA
recommendations).
The easy to understand four-level color severity
scale indicates motor performance in relation to
the recommended electrical parameter levels
including rated power, power factor, unbalance
and harmonics.
For mechanical power you can instantly view
the mechanical output power along with motor
torque and speed. The mechanical output power
is instantly compared with electrical power to
provide you with live efficiency measurements.
With this feature you can easily measure machine
performance during each operation cycle.
The NEMA derating screen is updated as the load
and the electrical conditions change, and each
new measurement is plotted on the tolerance
graph as a “+”. In this example we can see that
motor is within tolerance but is close to the ser-
vice factor. This indicates that there may be a
need for power quality mitigation, motor main-
tenance or some other performance improving
adjustment. By frequently performing these tests
over time, known benchmarks and performance
trends can be created, enabling informed
maintenance investment decisions.