Fluke 434-II Three-Phase Energy Analyzer

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The Fluke 434-II Three-Phase Energy Analyzer helps locate, predict, prevent, and troubleshoot power quality problems in three-phase and single-phase power distribution systems with this energy analyzer. This 434-II measurement process and data output are optimized to help you easily access important information. Additionally, it features an energy loss calculator.


  • Advanced power quality health—At-a-glance power quality health data in real time so you can make better maintenance decisions
  • Energy loss calculator—Discover the costs of energy loss specifically caused by poor power quality
  • Highest safety rating in industry—CAT III 1000 V / CAT IV 600 V


    Fluke 430-II Datasheet

    The Cost of Poor Power Quality

    Fluke 434-II 435-II 437-II User Manual

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    Fluke 434-II Three-Phase Energy Analyzer

    Built to help users minimize downtime, quickly troubleshoot power quality issues, and easily discover the costs of wasted energy. Downtime is costly therefore, acquiring data you need to solve to critical power quality issues quickly is key. This unit’s measurement process and data output are optimized to aid you to access critical information easily.

    Multiple parameters are measured simultaneously and displayed in formats that quickly describe overall power quality health. The detailed information helps you make better maintenance decisions—whether you’re trying to reduce energy waste, find the source of power quality issues or see how motor startups are affecting your electrical system.

    Data can be accessed as simple digital values, trend graphs (for fast insight into changes over time), waveforms, or phasor diagrams. The data can also be analyzed and organized into tabular formats. Detailed event data allows you to see the magnitude, duration and time stamping of anomalies enabling you to rapidly correlate the problems you are experiencing in your facility.

    Fluke 434-II Three-Phase Energy Analyzer 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
    • Troubleshoot: 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: Up to 8 hours operating time per charge on Li-ion battery pack

    Unified power measurement

    The 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, the energy loss calculator (see screen shot below) will determine how much money a facility is losing due to waste energy.


    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.

    The Fluke 430-II Series Power Quality Analyzers

    • The Fluke 434-II Energy Analyzer helps you understand your overall energy consumption and quantify how much energy loss is costing your facility.
    • The Fluke 435-II Power Quality and Energy Analyzer includes the same great features of the 434-II while adding advanced power quality functionality for more in depth troubleshooting.
    • If you need the same advanced functionality as the 435-II a higher frequency, the Fluke 437-II is the must-have power quality analyzer for 400 Hz power systems.
    • Lastly, the Fluke 438-II Power Quality and Motor Analyzer includes all the power quality and energy analysis capabilities that the Fluke 435-II has as well as the ability to measure mechanical motor parameters such as motor speed, torque and mechanical power without the need of mechanical sensors.
    Features Fluke 434-II Fluke 435-II Fluke 437-II Fluke 438-II
    Power Measurements  √  √   √
    Power Quality Measurements √ 
    IEC61000-4-30 Compliance Class S Class A Class A Class A
    Power, Energy & Loss Calculator  √   √
    Monitor & Trending  √
    Inrush, Inverter Efficiency
    Advanced Analysis; Event Waveforms, Flicker, Transients, Mains Signaling, and Power Wave
    Shipboard Power & 400Hz
    Motor Electrical & Mechanical Analysis (Optional) (Optional) (Optional)
    SD Card


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