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Fluke 435-II Series of Power Quality Analyzers-

Fluke 435-II Series of Power Quality Analyzers

The Power Quality analyzers that can monetize the cost of energy waste due to poor power quality. More powerful sampling options, greater accuracy and larger memory makes the Fluke 435-II better for longer term, higher resolution or more demanding power quality studies. The wide range of measurement functions and measurement methods make it the perfect tool for both power quality troubleshooting and discovering energy savings. Whether you’re checking the performance of motors and generators, trying to discover the source of an intermittent power problem or performing an energy study…this tool gives you the data you need to quickly get to the source of the problem.

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Think of the Fluke 435 II Power Quality and Energy Analyzer as your insurance policy. No matter what goes wrong in your facility, with the 435 II you will always be prepared. Equipped with advanced power quality functions and energy monetization capabilities, there is no electrical issue this model can’t handle.

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

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.

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.

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).

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.

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.

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:

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.

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.

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

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

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.

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Additional information

Voltage accuracy

0.1 % of Vnom

Power factor (Cos j/DPF)

kWh (kVAh, kvarh), Energy loss

Time synchronization

Optional with GPS430 accessory

Vrms (ac+dc)






Amps (ac +dc)

i430-Flex 1x, i430-Flex 10x, 1mV/A 1x, 1mV/A 10x


i430-Flex, 1mV/A


i430-Flex 1x, i430-Flex 10x, 1mV/A 1x, 1mV/A 10x


i430-Flex 1x, i430-Flex 10x, 1mV/A 1x, 1mV/A 10x


Fluke 435 @ 50 Hz nominal

Fluke 435 @ 60 Hz nominal

51.000 Hz to 69.000 Hz

Watts (VA, var)

i430-Flex, 1 mV/A

Class compliance







%f or %r, Absolute, THD


Design Rugged, shock proof with integrated protective holster Drip and dust proof IP51 according to IEC60529 when used in tilt stand position Shock and vibration Shock 30 g, vibration: 3 g sinusoid, random 0.03 g 2 /Hz according to MIL-PRF-28800F Class 2


Brightness: 200 cd/m 2 typ. using power adapter, 90 cd/m 2 typical using battery power Size: 127 mm x 88 mm (153 mm/6.0 in diagonal) LCD Resolution: 320 x 240 pixels Contrast and brightness: user-adjustable, temperature compensated


8GB SD card (SDHC compliant, FAT32 formatted) standard, upto 32GB optionally Screen save and multiple data memories for storing data including recordings (dependent on memory size)

Real-time clock

Time and date stamp for Trend mode, Transient display, System Monitor and event capture

Operating temperature

0 °C ~ +40 °C; +40 °C ~ +50 °C excl. battery

Storage temperature

-20 °C ~ +60 °C


+10 °C ~ +30 °C: 95% RH non-condensing
+30 °C ~ +40 °C: 75% RH non-condensing
+40 °C ~ +50 °C: 45% RH non-condensing

Maximum operating altitude

Up to 2,000 m (6666 ft) for CAT IV 600 V, CAT III 1000 V
Up to 3,000 m (10,000 ft) for CAT III 600 V, CAT II 1000 V
Maximum storage altitude 12 km (40,000 ft)

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


Three years (parts and labor) on main instrument, one year on accessories

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