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Fluke 43B Single Phase Power Quality Analyzer

Fluke’s single phase analyzers perform the measurements you need to maintain power systems and troubleshoot power problems and diagnose equipment failures.

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  • Get control of power problems

    The Fluke 43B has been the go-to industry leading single phase analyzer for over a decade in both industrial and classroom settings because of its intuitive ease of use and overall simplicity in performing just the right the measurements that you need to maintain power systems and troubleshoot power problems and diagnose equipment failures.

    • NiMH Battery provides extended operating time of 6.5 hours
    • Combines the most useful capabilities of a power quality analyzer, multimeter and scope
    • Calculates 3-phase power on balanced loads, from a single-phase measurement
    • Trends voltage, current, frequency, power harmonics and captures voltage sags, transients and inrush current
    • Monitoring functions help track intermittent problems and power system performance
    • Records two selectable parameters for up to 16 days
    • 20 measurement memories to save/recall screens and data with cursor readings
    • FlukeView® software can log harmonics and all other readings over time and provides a complete harmonics profile up to the 51st harmonic
    • Measures resistance, diode voltage drop, continuity, and capacitance
    • Users/applications manual and power quality video to help answer tough questions
    • Complete package with voltage probes and 400 A current clamp, FlukeView Software and optically isolated interface cable
    • 3 year warranty on the Fluke 43B, 1 year on accessories



    • Voltage, current, and power harmonics
    • Up to 51st harmonic
    • Total harmonic distortion (THD)
    • Phase angle of individual harmonics


    • Watts, power factor, displacement power factor (cos Θ), VA and VAR
    • Voltage and current waveforms

    Three phase

    • On-screen graphics show you how to set up 3-phase power measurements

    Sags and swells

    • Measurements are always automatically recorded to instantly show changes over time
    • Use cursors to read time and date of sags and swells


    • Catch voltage transients and waveform distortion down to 40 nS
    • Catch and save up to 40 transients
    • Correlate the cause of transient with time and date stamps


    • Voltage and current waveforms
    • True RMS voltage and current
    • Frequency
  • Specifications
    Input characteristics Input impedance 1 MΩ, 20 pF
    Voltage rating 600 V rms, CAT III
    V/A/Hz display True-rms voltage
    (AC + DC)
    Ranges 5.000 V, 50.00 V, 500.0 V, 1250 V1
    Accuracy ±(1% + 10 counts)
    True-rms current
    (AC + DC)
    Ranges 50.00 A, 500.0 A, 5.000 kA, 50.00 kA, 1250 kA
    Accuracy ±(1% + 10 counts)
    Frequency Ranges 10.0 to 15.0 kHz
    Accuracy ± ([% of reading] + [counts]): 0.5% + 2
    CF crest factor Ranges 1.0 - 10.0
    Accuracy ±(5% + 1 count)
    Power display Watts, VA, VAR   1-phase and 3-phase,3 conductor balanced loads
    Ranges 250 W - 1.56 GW
    Accuracy ±(4% + 4 counts) Fundamental Power
    Accuracy ± (2% + 6 counts) Total Power
    PF power factor Range 0 - 1.0
    Accuracy ±0.04
    DPF displacement power factor, Cos .F Range 0.25 - 0.9
    Accuracy ±0.04
    Range 0.90 - 1.0
    Accuracy ±0.03
    H2 frequency fundamental Ranges 40.0 to 70.0 Hz
    Accuracy ± ([% of reading] + [counts]): 0.5% + 2
    Harmonics display Voltage, current, frequency Ranges Fundamental to 51st harmonic
    Accuracy VA ±(3% + 2 counts) W ±(5% + 2 counts)
    Fundamental 2 to 31st harmonic VA ±(5% +3 counts) W ±(10% +10 counts)
    32 to 51st harmonic VA ±(15% +5 counts) W ±(30% +5 counts)
    Frequency fundamental Ranges 40 Hz to 70 Hz
    Accuracy ±0.25 Hz
    Phase Range V, A (Between fundamental and harmonics)
    Accuracy ±3° to ±15°
    Range W (Between voltage fundamental and current harmonics)
    Accuracy ±5° to ±15°
    (Current and Power)
    Range 1.0 to 30.0
    Accuracy ±10%
    THD total harmonic distortion Range 0.00 - 99.99
    Accuracy ±(3% + 8 counts)
    Sags and swells Recording times 4 min to 16 days (selectable)
    Vrms actual, vrms max, min (AC + DC) Ranges 5.000 V, 50.00 V, 500.0 V, 1250 V1
    Accuracy Readings ±(2% +10 counts); Cursor readings ± (2% + 12 counts)
    Arms actual, arms max, min (AC + DC) Ranges 50.00 A, 500.0 A, 5.000 kA, 50.00 kA
    Accuracy ±(2% +10 counts)
    Transient capture Minimum pulse width 40 ns
    Useful bandwidth input 1 DC to 1 MHz
    Number of transients 40
    Voltage threshold settings 20%, 50%, 100%, 200% above or below reference
    Reference signal After START, the Vrms and frequency of the signal are measured. From these data a pure sinewave is calculated as reference for threshold setting.
    Vpeak min, vpeak max at cursor 10 V, 25 V, 50 V, 125 V, 250 V, 500 V, 1250 V Accuracy: ±5% of full scale
    R, C, diode, continuity Resistance ranges 500.0 Ω, 5.000 kΩ, 50.00 kΩ, 500.0 kΩ, 5.000 MΩ, 30.00 MΩ
    Resistance accuracy ±(0.6% + 5 counts)
    Capacitance ranges 50.00 nF, 500.0 nF, 5.000 µF, 50.00 µF, 500.0 µF
    Capacitance accuracy   ±(2% + 10 counts)
    Diode Ranges 0 to 3.000 V
    Diode voltage  
    Accuracy ±(2% + 5 counts)
    Continuity Beeper on at < 30 Ω ± 5 Ω
    Max current 0.5 mA
    Temperature °C or °F
    Inrush current Inrush times   1 s, 5 s, 10 s, 50 s, 100 s, 5 min
    Current ranges 1 A, 5 A, 10 A, 50 A, 100 A, 500 A, 1000 A
    Cursor readings A peak max at cursor 1 and cursor 2
    Accuracy ±5% of full scale
    Time between cursors 4 to 235 pixels (1 pixel = inrush time/250) Accuracy: ±(0.2% + 2 pixels)
    (with accessory)
      Range -100 °C - 400 °C
    Accuracy ±(0.5% + 5 counts)
    Scope display Measurements   DC, AC, AC + DC, peak, peak-peak, frequency, duty cycle, phase, pulse width, crest factor
    Time ranges 20 ns/div to 60 s/div
    Max sampling rate 25 MS/s
    Bandwidth Voltage channel [1] 20 MHz at inputs, 1 MHz with TL24 leads
    Current channel [2] DC to 15 kHz at inputs, 10 kHz with i400s current clamp
    Coupling AC, DC (10 Hz - 3 dB)
    Vertical sensitivity 5 mV/div to 500V/div
    Vertical resolution 8 bit (256 levels)
    Record length 512 samples per channel
    Base ranges 60 S/div to 20 nS/div ± (0.4% + 1 pixel)
    Timebase modes Normal, roll, single
    Pre-trigger Up to 10 divisions
    Trigger Source Input 1 or input 2 or automatic selection
    Trigger Mode Automatic Connect-and-View™, free Run, and single Shot
    Connect-and-view™ Advanced automatic triggering that recognizes signal patterns

    Automatically adjusts triggering, timebase and amplitude and displays stable pictures

    Memories 20 (screens, settings, data)
    Recording Recording times 4 min to 16 days (selectable)
    Parameters Choose one or two parameters from one of the groups below


    Power Watts, VA, VAR, PF, DPF, frequency

    Harmonics, THD, volts (Fund. and harmonic), ampères (F&H) watts(F&H)

    Frequency (H), %(H) of total, Phase(H), KF

    Resistance Resistance, diode, continuity, capacitance
    Scope DC voltage, DC current, AC voltage, AC current, frequency,

    Pulse width + or -, phase, duty cycle + or -, peak max, peak min, peak min-max, crest factor

    Environmental specifications Operating temperature 0°C to +50°C
    Safety specifications Electrical safety EN 61010-1 CAT III, 600V. CSA listed
    Mechanical and general specifications Size 232 x 115 x 50 mm
    Weight 1.1 kg
    Warranty 3 years
    Battery life Rechargeable NiMH pack (charger included), 6.5 hrs extended operating time (continuous)
    Shock and vibration Mil 28800E, Type 3, Class III, Style B
    Case IP51 (dust, drip, waterproof)
    1. Rated EN 61010-1 600 V CAT III CSA
    • Models
      Model Name Description  
      Fluke 43B Fluke 43B Single Phase Power Quality Analyzer


      • C120 Hard Case
      • TP1 Flat-tipped Slim-Reach™ Test Probes
      • TP4 4 mm Round Slim-Reach™ Test Probes
      • i400s AC Current Clamp
      • OC4USB Optically Isolated USB Interface Adapter
      • BP120MH Rechargeable NiMH Battery Pack (installed)
      • PM 8907 Line Voltage Adapter/Battery Charger
      • SW43W FlukeView™ Power Quality Analyzer Software and Users Manual on CD-ROM
      • Shielded Banana-to-BNC Adapter
      • Users Manual / Application Guide
    • Manuals
      43B Users Manual Download
      43B Users Manual Supplement Download
      SW43W Mode d'emploi Download
      SW43W Bedienungshandbuch Download
      43B and 43 Statement of Memory Volatility Download
      43B Applications Guide Download
      43B Getting Started Download
      43B Getting Started Supplement Download
      43B Service Manual Download
      43B Service Manual Supplement Download
      43B Software Reference Manual Download
      SW43W Users Software Manual Download
    • Application Notes
      5th harmonic resonance Download
      Basic power quality measurements on the go with the Fluke 345 Download
      Electrical noise and transients Download
      How adjustable speed drives affect power distribution Download
      Making watt-hour measurements with Fluke power quality analyzers Download
      Saving energy through load balancing and load scheduling Download
      Sensitive electronics require stable, clean power Download
      Stepping up to power quality tools Download
      The power of a wave form: Expanded troubleshooting options with the Fluke 345 Power Quality Clamp Meter Download
      Troubleshooting commercial lighting loads Download
      Who sets the rules for electrical testing and safety? Download
    • Brochures
      Fluke Power Quality Family Brochure Download
      PQ Warning Signs Brochure Download
    • Case Studies
      Case Study: Energy Savings Make the Case For An HVAC Upgrade Download
      Case Study: Finding a Power Quality needle in a 30-mile haystack Download
      Case Study: Half Wave Rectifier Download
      Case Study: Lighting Ballast Evaluation Download
      Case Study: Machine Shop Motor Failures Download
      Case Study: Malfunctioning Traffic Light Download
      Case Study: Performing Power Quality Studies and Troubleshooting Loads Download
      Case Study: Rural Transformer Failure Download
      Case Study: The Vibrating Transformer Download
      Case Study: Why Inrush Tripped an A/C System Download
    • Data Sheets
      Fluke 43B Data Sheet Download
      Fluke Multipoint Power Recorder Download
    • Demos
      Fluke 43 Plugin Demo Online Download