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Fluke 437-II

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

Brand: Fluke
Model No: 437-II
MPN: 4116692
Our Model No: 437II
Condition: NEW
PDF Document Icon Data Sheet (499 KB)


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Product Features:

  • Quickly see how much energy is being wasted, in terms of real dollars
  • Easily see how motor startups are affecting motor drive performance
  • Get at-a-glance power quality health data in real-time to make better maintenance decisions
  • Capture every measurement automatically without any set-up
  • 400 Hz operation according to MIL-STD 1399 for use in avionic and military applications
  • Measure all three phases and neutral with included flexible current probes
  • Safety rating: 600V CAT IV/1000V CAT III rated for use at service entrances
  • Fluke Connect compatible

The Fluke 437II Three-Phase Power Quality and Energy Analyzer with 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.

Helps determine where energy losses occur visualize their impact on your energy bill Click for larger image

Energy Loss Calculator

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.

ASystem Monitor displays a Bar graph screen Click for larger image

Advanced Power Quality Health

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.

Volts/Amps/Hertz Trend display Click for larger image



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.

The Analyzer functions as a high resolution 8 channel scope recorder Click for larger image

PowerWave Data Capture

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).

Shipboard Power Measurement Click for larger image

Shipboard Power Measurement

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.

  • 1 - Power Adapter (BC430)
  • 1 - International Plug Adapter Set
  • 1 - Li-ion Battery (BP290)
  • 1 - Test Lead and Alligator Clip Set (TL430)
  • 1 - Color Coding Clips and Regional Decals (WC100)
  • 4 - 24 in. Flexible Current Clamps (i430flex-TF)
  • 1 - 8 GB SD card
  • 1 - A-B Mini USB Cable
  • 1 - Hard Case with Rollers (C437)
  • 1 - User Manual and PowerLog Software (CD)
Carrying Cases
Model Description Buy Now Price
C437-II Fluke C437-II Hard Carrying Case with Rollers for 430-II Series Add to Cart
Sale $629.99
C1740 Fluke C1740 Soft Carrying Case with Buckle for Power Quality Analyzers Add to Cart
Sale $269.99
HH290 Fluke HH290 Hanging Hook for 190-II Series Add to Cart
Sale $71.95

Only 3 left in stock
Current Clamps
Model Description Buy Now Price
I400S Fluke I400S AC Current Clamp/BNC, 0.5A-4000A AC Switchable Add to Cart
Sale $260.99

Only 1 left in stock
Model Description Buy Now Price
GPS430-II Fluke GPS430-II GPS Time Synchronization Module for 430-II Series Add to Cart


Power Supplies
Model Description Buy Now Price
BP291 Fluke BP291 High Capacity Li-Ion Battery for 190-II Series, 4800 mAH Add to Cart
Sale $314.99

Only 3 left in stock
Test Leads, Probes and Clips
Model Description Buy Now Price
I5SPQ3 Fluke I5SPQ3 AC Current Clamps for 430-II Series, 5A AC Add to Cart


Only 1 left in stock
WC100 Fluke WC100 32-Piece Color Localization Set (8 Colors) Add to Cart
Sale $22.61
Model Description Buy Now Price
430-II/MA Fluke 430-II/MA Motor Analyzer Upgrade Kit for 430-II Series Add to Cart


Fluke Careplans
Model Description Buy Now Price
G3P-GROUP4 Fluke G3P-GROUP4 5-Year Gold CarePlan for 196C, 199C, 434, 435, 724, 725, 726, 700BCW, 741 and 743 Add to Cart


S3P-GROUP4 Fluke S3P-GROUP4 3-5-Year Silver CarePlan for 196C, 199C, 434, 435, 724, 725, 726, 700BCW, 741, 743 Add to Cart
Sale $125.00
Fluke 430 Series II
Fluke 430 Series II
Fluke 437-II 400hz Power Quality Analyzer
Fluke 437-II 400hz Power Quality Analyzer
Fluke 430 Series II
Fluke Series 430 II
How To Check For Dips And Swells Using The Fluke 435
How to Check for Dips and Swells
Using the Fluke Series 435 II
How To Connect Using The Phasor Diagram On A Fluke 435
How to Connect Using the Phasor Diagram
on a Fluke Series 435 II
How To Perform A Logger Set-Up On The Fluke 435 II
How to Perform a Logger Set-Up
on the Fluke Series 435 II
How To Perform A Transient Capture On The Fluke 435
How to Perform a Transient Capture
on the Fluke Series 435 II
How To Perform A Trend Configuration On The Fluke 435
How to Perform a Trend Configuration
on the Fluke Series 435 II
How To Transfer Data From The Fluke 435 To Power Log
How to Transfer Data
from the Fluke Series 435 II
How To Use A Harmonics Test In A 435 Power Quality Analyzer
How to Use a Harmonics Test
in a Fluke Series 435 II
Logging Capture and Sample Rate On a Fluke 435 Series II
Logging Capture and Sample Rate
on a Fluke Series 435 II
Data Sheet: PDF Document Icon (499 KB)
Manual: PDF Document Icon (2.65 MB)
Brochure PDF Document Icon (1.25 MB)
Could you make better operational and maintenance decisions? PDF Document Icon (279 KB)
WiFi download from the Fluke 430 Series-II Analyzers PDF Document Icon (192 KB)
The costs of poor power quality PDF Document Icon (681 KB)
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