Fluke 437-II Calibration Instruments
  • Fluke 437-II Calibration Instruments
  • Fluke 437-II Calibration Instruments

Fluke 437-II


Three-Phase Power Quality and Energy Analyzer with Fluke Connect Compatibility and iFlex Probes, 400 Hz



The Fluke 437II Three-Phase Power Quality and Energy Analyzer with Fluke Connect Compatibility and iFlex Probes, 400 Hz is designed specifically for the defense and avionics industries. Equipped with the PowerWave, Power Inverter Efficiency and Energy Loss Calculator functions, the 437-II goes one step further by measuring up to 400 Hz. The ability to measure at a higher frequency is necessary for those working in submarines, aircrafts, and other transport applications.

Energy Loss Calculator

The 437-II provides advanced analysis of energy usage to help you to determine where energy losses occur and to visualize their impact on the energy bill.

The 437-II will measure these components simultaneously. The Energy Loss Calculator uses patented algoritms to calculate losses and to monetize them. The costs due to Effective W, Reactive var, Unbalance VA, Distortion VA and Neutral A are displayed per Hour. The total costs are displayed per year which gives you an impression of possible savings on a yearly basis. Four different rates can be set (price per kWh as a function of period of day). The length (meters or feet) and diameter (square millimeter or AWG/American Wire Gauge) of the cables between service entrance and the load can be set manually. In AUTO mode a loss of 3% due to wire resistance is assumed, which is normal for an average distribution system.

Advanced 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.

Power Inverter Efficiency

Power Inverter Efficiency measures the efficiency and amount of energy being delivered by inverters that convert single phase DC into a single or three phase AC. 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 437-II 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.

Unified Power Measurement

Previously, only experts could calculate how much energy was wasted due to power quality issues; utilities could calculate the cost, but the required measurement process was beyond the reach of average electricians. With the patented Unified Power function of the 437-II, you can use one handheld tool to determine how much power is being wasted, and calculate exactly what the extra consumption costs. The Unified Power Measurement System measures Parameters of Classical Power (Steinmetz 1897) and IEEE 1459-2000; Detailed Loss Analysis; and Unbalance Analysis. These UPM calculations are used to quantify the fiscal cost of energy loss caused by power quality issues. Along with other facility-specific information, the calculations are computed by an Energy Loss Calculator that ultimately determines how much money a facility loses due to wasted energy.

UPM gives a more comprehensive breakdown of the energy consumed in a 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 into 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 to good housekeeping in the facility, as unbalance problems can cause motor failure or shorten equipment life expectancy. Unbalance also wastes 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 overheating transformers and conductors; nuisance tripping of circuit breakers; and early failures of electrical equipment. Quantifying the cost of wasted energy due to the presence of harmonics simplifies the return-on-investment calculations 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.


With a unique AutoTrend feature you can get fast insight into changes over time. Every displayed reading is automatically and continuously recorded without seting up threshold levels or manually starting the process. You can quickly view trends in voltage, current, frequency, power, harmonics or flicker on all three phases plus neutral.

PowerWave Data Capture

PowerWave records high resolution waveforms during a time span of several minutes. This allows you to monitor the influence of sudden load changes on voltage and current waveforms. For example, large voltage changes may indicate a weak power distribution system.

In this measuring mode, the 437-II functions as an 8 channel scope recorder that records high resolution waveforms in a single shot acquisition. The function records half cycle rms values on 8 channels, frequency and instantaneous power (Vrms 1/2, Arms 1/2, W, Hz and scope waveforms for Voltage, Amps, Watts).

400 Hz and Shipboard Power Measurement

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

Shipboard V/A/Hz (Volts/Amps/Hertz) displays a Meter screen with important numerical measuring values and functions that are useful for shipboard installations. The measuring results comply with the requirements of the military standard MIL-STD-1399-300B.

Fluke Connect with ShareLive video call lets you stay in contact with your entire team without leaving the field. The Fluke Connect mobile app is available for Android and iOS and works with over 20 different Fluke products. Make the best decisions faster than ever before by viewing all temperature, mechanical, electrical and vibration measurements for each equipment asset in one place. Get started saving time and money by increasing your productivity.

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