Fluke 437-II Power Quality and Energy Analyzer


Featuring an energy and power quality analyzer that can monetize the cost of energy waste due to poor power quality and is ideal for characterizing power quality, conducting load studies and capturing hard-to-find voltage events over a user-defined period of time.

SKU: 437-II


More detailed power quality analysis
capability, and a new Fluke-patented
energy monetization function

The Fluke 437-II is a Class A compliant three-phase power quality analyzer that help you locate, predict, prevent and troubleshoot problems in single phase and three phase power distribution systems. Great for Marine, Military, and Aero Applications. In addition to all the standard features of the Fluke 434-II, the Fluke 437-II offers additional features for the more demanding application.

Key Features

Energy loss calculator: Classic active and
reactive power measurements, unbalance and
harmonic power, are quantified to pinpoint true
system energy losses in dollars (other local
currencies available)
Power inverter efficiency: Simultaneously
measure AC output power and DC input power
for power electronics systems using optional
DC clamp.
PowerWave data capture: 435 and 437 Series
II analyzers capture fast RMS data, show
half-cycle and waveforms to characterize
electrical system dynamics (generator start-ups,
UPS switching etc.).
Waveform capture: 435 and 437 Series II
models capture 100/120 cycles (50/60Hz)
of each event that is detected in all modes,
without set-up.
Automatic Transient Mode: 435 and 437
Series II analyzers capture 200 kHz waveform
data on all phases simultaneously up to 6 kV.
Fully Class-A compliant: 435 and 437 Series
II analyzers conduct tests according to the
stringent international IEC 61000-4-30 Class-A
Mains signaling: 435 and 437 Series II
analyzers measure interference from ripple
control signals at specific frequencies.
400 Hz measurement: 437 Series II analyzer
captures power quality measurements for
avionic and military power systems.
Troubleshoot real-time: Analyze the trends
using the cursors and zoom tools.
Highest safety rating in the industry: 600 V CAT IV/1000 V CAT III rated for use
at the service entrance.
Measure all three phases and neutral: With included four flexible current probes
with enhanced thin flex designed to fit into
the tightest places.
Automatic Trending: Every measurement
is always automatically recorded, without
any set-up.
System-Monitor: Ten power quality
parameters on one screen according to
EN50160 power quality standard.
Logger function: Configure for any test
condition with memory for up to 600
parameters at user defined intervals
View graphs and generate reports: With included analysis software.
Battery life: Seven hours operating time
per charge on Li-ion battery pack.

About the Fluke 430 Series

The new 430 Series II Power Quality and Energy
Analyzers offer the best in power quality analysis
and introduce, for the first time ever, the ability
to monetarily quantify energy losses.

The new Fluke 434, 435 and 437 Series II
models help locate, predict, prevent, and troubleshoot power quality problems in three-phase
and single-phase power distribution systems.
Additionally, the Fluke-patented energy loss
algorithm, Unified Power Measurement, measures
and quantifies energy losses due to harmonics
and unbalance issues, allowing the user to pinpoint
the origin of energy waste within a system.

Energy Loss Calculator

Unified Power Measurement

Fluke’s patented Unified Power Measurement system (UPM) provides the most comprehensive view
of power available, measuring:

Parameters of Classical Power (Steinmetz 1897)
and IEEE 1459-2000 Power
Detailed Loss Analysis
Unbalance Analysis

These UPM calculations are used to quantify
the fiscal cost of energy loss caused by power
quality issues. The calculations are computed,
along with other facility-specific information,
by an Energy Loss Calculator that ultimately
determines how much money a facility loses
due to wasted energy.

Energy savings

Traditionally energy savings are achieved by
monitoring and targeting, or in other words, by
finding the major loads in a facility and optimizing their operation. The cost of power quality
could only be quantified in terms of downtime
caused by lost production and damage to electrical equipment. The Unified Power Measurement
(UPM) method now goes beyond this to achieve
energy savings by discovering the energy waste
caused by power quality issues. Using the
Unified Power Measurement, Fluke’s Energy Loss
Calculator (see screen shot below) will determine
how much money a facility is losing due to waste


UPM gives a more comprehensive breakdown of
the energy consumed in the plant. In addition to
measuring reactive power (caused by poor power
factor), UPM also measures the energy waste
caused by unbalance; the effect of unevenly
loading each phase in three-phase systems.
Unbalance can often be corrected by reconnecting loads on different phases to ensure the
current drawn on each phase is as equal as
possible. Unbalance can also be corrected by
installing an unbalance reactance device (or
filter), that will minimize the effects. Correcting
unbalance should be basic good housekeeping
in the facility as unbalance problems can cause
motor failure or shorten equipment life expectancy. Unbalance also wastes energy. Using
UPM can minimize or eliminate that energy
waste, thus saving money.


UPM also provides details of the energy wasted
in your facility due to the presence of harmonics.
Harmonics may be present in your facility due to
the loads you operate or may be caused by loads
in adjacent facilities. The presence of harmonics
in your facility can lead to:

overheating transformers and conductors
nuisance tripping of circuit breakers
early failures of electrical equipment

Quantifying the cost of wasted energy due to the
presence of harmonics simplifies the return-on investment calculation needed to justify purchasing harmonic filters. By installing a harmonic
filter the ill effects of harmonics can be reduced
and energy waste eliminated, resulting in lower
operational costs and more reliable operation.

PowerWave data capture

For some users, loads switching is a cause of power
quality problems. When loads switch on, the
current draw sometimes causes the voltage to drop
to a level that causes other equipment to malfunction. The PowerWave function available in the 435
and 437 Series II models enables users to capture
voltage, current and frequency signals simultaneously at a high speed to see which interaction is
potentially causing problems.
PowerWave goes beyond standard power quality measurements; PowerWave’s fast data capture
mode enables system dynamics to be characterized.
Waveforms for voltage and current are continuously
captured for the specified time, and are displayed
on screen in high detail; the power waveform is
derived from the data. In addition, half-cycle RMS
values for voltage, current, power and frequency
can be stored and retrieved for analysis. This
feature is particularly useful for testing of standby
generation systems and UPS systems where
reliable switch-on can be vital.

Power inverter efficiency

Power inverters take DC current and transform it
into AC current, or vice versa. Solar generation
systems usually include an inverter that takes the
DC energy from the solar cells and converts it to
useful AC power. Inverters can lose performance
over time and need to be checked. By comparing
the input power with the output power you can
determine the system efficiency. The 435 and 437
II models can measure the efficiency of such inverters by simultaneously measuring the DC and AC
power of a system to determine how much power
is lost in the conversion process.

Measures everything

Measure true-rms, peak voltage and current,
frequency, dips and swells, transients, interruptions, power and power consumption, peak
demand, harmonics up to the 50th, inter-harmonics, flicker, mains signaling, inrush and unbalance.

Logger: record the detail you need

User-configurable, long-term recording of MIN, MAX
and AVG readings for up to 150 parameters on all
4 phases. Enough memory is available to record
600 parameters for over a year with 10 second
resolution, or capture smaller variations with resolution down to 0.25 seconds. The logger function is
quickly accessed by the LOGGER button, the simple
step-by-step setup makes capturing your important
measurements as easy as can be.

System-monitor: summary screen of overall power quality health

The MONITOR mode delivers a dashboard display of
rms voltage, harmonics, flicker, interruptions, rapid
voltage changes, swells, unbalance, frequency and
mains signaling.

The dashboard is updated live, showing compliance of each parameter to EN50160 limits or your
own limits. Color-coded bars clearly show which
parameters are inside (pass) or outside (fail) limits.
During a monitor session, you can easily drill
down to more detail of any parameter to view and
capture its trend for a report.

400 Hz

By increasing the power frequency to 400 Hz,
transformers and motors can be much smaller and
lighter than at 50 or 60 Hz, which is an advantage
in aircrafts, submarines, space crafts, and other
military equipment and hand-held tools. The
437 II model captures power quality measurements
for these types of avionic and military systems.

Extensive data analysis possibilities

The Fluke 430 Series II analyzers provide three
ways to analyze measurements. Cursors and zoom
tools can be used “live” while taking measurements, or “off line” on stored measurement data.
Additionally, the stored measurements can be
transferred to a PC with the included software
to perform custom analysis and create reports.
Measurement data can also be exported to
common spreadsheet programs. Store hundreds of
measurement datasets and screen captures for use
in reports (depending on memory capacity).

Easy to use

Pre-programmed setups and user-friendly screens
make power quality testing as simple as you would
expect from Fluke. The high-resolution color screen
updates every 200 ms and displays waveforms and
wiring diagrams color coded to industry standards.
Handy on-screen wiring diagrams for all commonly
used three-phase and single-phase configurations
guide you through connections.

CAT IV 600 V and CAT III 1000 V safety rating

Designed to help protect you and your equipment,
the Fluke 430 Series II analyzers and accessories
are all certified to meet the stringent standards
for use in CAT IV 600 V and CAT III 1000 V
environments such as power connections and
outlets throughout a low-voltage power distribution

Automatic transient display

Every time an event or voltage distortion is
detected, the instrument triggers and automatically
stores voltage and current waveforms on all three
phases and neutral. The analyzer will also trigger
when a certain current level is exceeded. Hundreds
of dips, swells, interruptions and transients can be
captured this way. You can see voltage transients
as high as 6 kV and as fast as 5 microseconds.

Fully Class-A compliant
The Fluke 435-II and 437-II are fully compliant
with the new IEC 61000-4-30 Edition 2 Class-A
standard. With this powerful capability, all measurements will be consistent and reliable in
accordance with the latest international standard.
Fluke’s Class A compliance, including time
synchronization compliance has been independently verified, certification is available on request.

IEC 61000-4-30 Edition 2 Class Compliance


Measurement algorithms

Voltage accuracy
0.1 % of Vnom
0.1 % of Vnom
0.5 % of Vnom

Class compliance

Time synchronization
Optional with GPS430 accessory

What is Class-A conformity?

Power quality measurement is a relatively new,
and quickly evolving field. There are hundreds
of manufacturers around the world with unique
measurement methodologies. Whereas basic single-
and three-phase electrical measurements like rms
voltage and current were defined long ago, many
power quality parameters were not previously
defined, forcing manufacturers to develop their own
algorithms. With so much variation between instruments, electricians tend to waste too much time
trying to understand an instrument’s capabilities
and measurement algorithms instead of understanding the quality of the power itself!
The new IEC 61000-4-30 Edition 2 Class-A
standard takes the guesswork out of selecting
a power quality instrument. The standard IEC
61000-4-30 Edition 2 defines the measurement
methods for each parameter to obtain reliable,
repeatable and comparable results. In addition,
the accuracy, bandwidth and minimum set of
parameters are all clearly defined. The 435 and
437 Series II models include flagging and available
internal clock time-synching to fully comply with
the rigorous requirements of Class A compliance.
The Edition 2 standard includes a new class
of instrument, Class S. While not as accurate as
Class A instruments, Class S instruments such as
the 434 Series II Energy Analyzer produce results
that are consistent with Class A instruments.

Fluke 437-II Specifications

Vrms (ac+dc) Measurement Range
1 to 1000 V phase to neutral
Vrms (ac+dc) Resolution
0.01 V
Vrms (ac+dc) Accuracy
?0.1% of nominal voltage
Vfund Resolution
0.1 V
Vfund Accuracy
?0.1% of nominal voltage
Operating Temperature
32 to 104?F (0 to 40?C); 104 to 122?F (40 to 50?C) excluding battery
Storage Temperature
-4 to 140?F (-20 to 60?C)
Electro-Magnetic-Compatibility (EMC)
EN 61326 (2005-12) for emission and immunity
Mini-USB-B, Isolated USB port for PC connectivity SD card slot accessible behind instrument battery
Click here for complete specifications on the Fluke 437-II


There are no reviews yet.

Be the first to review “Fluke 437-II Power Quality and Energy Analyzer”

Your email address will not be published. Required fields are marked *