Fluke 437 Series II 400 Hz Power Quality Monitor and Energy Analyzer

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If you’re dealing with aviation systems measuring key power quality parameters at 400Hz is a must. The Fluke 437-II provides that capability (and measures at 50 and 60Hz too) and is designed for users who need to quickly get to the source of the power quality problem, so they can minimize expensive downtime. The integrated shipboard power measurement system analyzes according to MIL-STD 1399 to automatically give a full evaluation of voltage, current and power according to the standard. This evaluation makes measurement and analysis as easy as can be. The measurement process, and the way the 437-II displays data has been optimized to provide to the most important information as quickly as possible. Multiple parameters are measured simultaneously and are displayed in formats that quickly describe overall power quality health while giving you the detailed information you need to make better maintenance decisions. Data can be quickly accessed as simple digital values, viewed as trend graphs that give you fast insight into changes over time, or viewed as waveforms and phasor diagrams or analyzed. Data can also be organized into tabular format for viewing events where the magnitude, duration and time stamp enable rapid correlation to the problems you are experiencing.

Locating, Predicting, Preventing and Troubleshooting Power Quality Issues—Up to 400Hz

Higher power frequencies mean smaller and lighter transformers and motors – a critical factor in avionic and military transport applications where weight is a primary concern. The Fluke 437 Series II Power Quality and Energy Analyzer can show you 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. Designed for capturing power quality measurements in avionic and military systems, Fluke 437 Series II is the must-have 400 Hz quality analyzer.

  • 400 Hz operation according to MIL-STD 1399 for use in avionic and military applications
  • Shipboard power measurement system analyzes according to MIL-STD 1399 to automatically give a full evaluation of voltage, current and power
  • Get at-a-glance power quality health data in real-time so you can make better maintenance decisions
  • Measure all three phases and neutral with the included flexible current probes
  • Quickly see how much money you’re losing due to energy waste in terms of real dollars
  • Easily see how motor startups are affecting motor drive performance
  • Highest safety rating in the industry: 600 V CAT IV/1000 V CAT III rated for use at the service entrance
  • Fluke Connect® compatible* – view data locally on the instrument, via Fluke Connect mobile app and PowerLog 430-II desktop software

Advanced Power Quality Health—At-a-glance power quality health data in real-time so you have the data you need, when you need it

Power wave data capture
Power wave data capture

The Fluke 437-II Power Quality Monitor and Energy Analyzer utilizes an integrated Power Quality Health summary that gives you an at-a-glance view of a complete range of power quality issues in real time. With a simple graphical presentation, complete with tolerance limits, you can quickly discover which power quality problems may be present on your electrical system. If you don’t know where to start or what problems might exist, the advanced Power Quality Health summary will simplify the task and serves as a comprehensive starting point for further troubleshooting.

PowerWave Data Capture—Quickly identify how motor and generator startups are impacting electrical system performance

With PowerWave data capture you can capture three-phase high resolution voltage and current waveforms for up to five minutes along with detailed RMS voltage and current values. By analyzing the interaction of these values over time you can correlate the effects of voltage, current and frequency during the critical startup of motors and generators. PowerWave even goes beyond the standard power quality measurements allowing you to record half cycle rms values on 8 channels, frequency and instantaneous power (Vrms1/2, Arms1/2, W, Hz and scope waveforms for voltage, amps and watts)

Power Inverter Efficiency

Power inverters take DC current and transform it into AC current, or vice versa. But, what percentage of that power going into the inverter comes out as usable current? The Fluke 437-II Power Monitor and Energy Analyzer has an integrated power inverter efficiency mode that allows users to better understand power inverter performance. Nothing is ever 100?ficient, and a power inverter’s efficiency will vary depending on how much power is being used at the time (with the efficiency generally being greater when more power is being used). Inverters can also lose performance over time and need to be checked. By comparing the input power with the output power, you can determine the system efficiency. With the Power Inverter Efficiency feature you can discover just how good your inverter is at converting your DC power to AC (or visa versa). Poor power efficiency may occur when the inverter is wrongly sized for the load.

AutoTrend—Quickly see the trend

AutoTrend capability shows changes over time
AutoTrend capability shows changes over time

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

Product Specifications
VoltModelMeasurement RangeResolutionAccuracy
Vrms (ac+dc)1 V to 1000 V phase to neutral0.01 V± 0.1% of nominal voltage**** 
Vpk1 Vpk to 1400 Vpk1 V5% of nominal voltage
Voltage Crest Factor (CF)1.0 > 2.80.01± 5 %
Vfund 0.1 V± 0.1% of nominal voltage
Amps (accuracy excluding clamp accuracy)
Amps (ac+dc)i430-Flex 1x 5 A to 6000 A1 A± 0.5% ± 5 counts
i430-Flex 10x0.5 A to 600 A0.1 A± 0.5% ± 5 counts
1mV/A 1x5 A to 2000 A1A± 0.5% ± 5 counts
1mV/A 10x0.5 A A to 200 A (ac only)0.1 A± 0.5% ± 5 counts
Apki430-Flex 8400 Apk 1 Arms± 5 %
1mV/A5500 Apk1 Arms± 5 %
A Crest Factor (CF)1 to 100.01± 5 %
Amps½i430-Flex 1x 5 A to 6000 A 1 A ± 1% ± 10 counts 
i430-Flex 10x0.5 A to 600 A0.1 A ± 1% ± 10 counts
1mV/A 1x  5 A to 2000 A 1A ± 1% ± 10 counts
1mV/A 10x0.5 A A to 200 A (ac only)0.1 A± 1% ± 10 counts
Afundi430-Flex 1x 5 A to 6000 A1 A± 0.5% ± 5 counts 
i430-Flex 10x 0.5 A to 600 A0.1 A± 0.5% ± 5 counts
1mV/A 1x 5 A to 2000 A1A± 0.5% ± 5 counts
1mV/A 10x 0.5 A A to 200 A (ac only)0.1 A± 0.5% ± 5 counts
Fluke 437 @ 50 Hz nominal42.500 Hz to 57.500 Hz0.001 Hz± 0.01 Hz
Fluke 437 @ 60 Hz nominal 51.000 Hz to 69.000 Hz0.001 Hz± 0.01 Hz
Fluke 437 @ 400 Hz nominal340.0 Hz to 460.0 Hz0.1 Hz± 0.1 Hz
Watts (VA, var)i430-Flex max 6000 MW0.1 W to 1 MW± 1% ± 10 counts
1 mV/Amax 2000 MW0.1 W to 1 MW± 1% ± 10 counts
Power Factor (Cos j/DPF)0 to 10.001± 0.1% @ nominal load conditions
kWh (kVAh, kvarh)i430-Flex 10xDepends on clamp scaling and V nominal± 1% ± 10 counts
Energy Lossi430-Flex 10xDepends on clamp scaling and V nominal± 1% ± 10 counts Excluding line resistance accuracy
Harmonic Order (n)DC, 1 to 50 Grouping: Harmonic groups according to IEC 61000-4-7
Inter-Harmonic Order (n)OFF, 1 to 50 Grouping: Harmonic and Interharmonic subgroups according to IEC 61000-4-7
Volts %f0.0 % to 100 %0.1 %± 0.1% ± n x 0.1 %
r0.0 % to 100 %0.1 %± 0.1% ± n x 0.4 %
Absolute0.0 to 1000 V0.1 V± 5% *
THD0.0 % to 100 %0.1 %± 2.5 %
Amps %f0.0 % to 100 %0.1 %± 0.1% ± n x 0.1%
r0.0 % to 100 %0.1 %± 0.1% ± n x 0.4 %
Absolute0.0 to 600 A0.1 A± 5% ± 5 counts
THD0.0 % to 100 %0.1 %± 2.5 %
Watts %f or r 0.0 % to 100 %0.1 %± n x 2%
AbsoluteDepends on clamp scaling and V nominal ± 5% ± n x 2 % ± 10 counts
THD0.0 % to 100 %  0.1 %± 5 %
Phase Angle -360° to +0°± n x 1°
Plt, Pst, Pst (1min) Pinst0.00 to 20.000.01± 5 %
Volts %0.0 % to 20.0 %0.1 %± 0.1 %
Amps %0.0 % to 20.0 %0.1%± 1 %
Mains Signaling
Threshold LevelsThreshold, limits and signaling duration is programable for two signaling frequencies
Signaling Frequency60 Hz to 3000 Hz0.1 Hz 
Relative V%0 % to 100 %0.10 %± 0.4 %
Absolute V3s (3 second avg.)0.0 V to 1000 V0.1 V± 5 % of nominal voltage
General Specifications
CaseDesign 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
DisplayBrightness: 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
Memory16GB Wi-Fi SD card for standard models or 8GB SD card for /INTL models (SDHC compliant, FAT32 formatted), up to 32GB optionally. Screen save and multiple data memories for storing data including recordings (dependent on memory size).
Real-Time ClockTime and date stamp for Trend mode, Transient display, System Monitor and event capture
Operating Temperature0 °C ~ +40 °C; +40 °C ~ +50 °C excl. battery
Storage Temperature-20 °C ~ +60 °C
Humidity+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 AltitudeUp 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
InterfacesMini-USB-B, Isolated USB port for PC connectivity SD card slot accessible behind instrument battery
WarrantyThree years (parts and labor) on main instrument, one year on accessories
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* ± 5 % if ? 1 % of nominal voltage ± 0.05 % of nominal voltage if < 1% of nominal voltage
** 50Hz/60Hz nominal frequency according to IEC 61000-4-30
*** 400Hz measurements are not supported for Flicker, Mains Signaling and Monitor Mode
**** For nominal voltage 50 V to 500 V