Product selection guide: Power quality analyzers

Fluke 435 Series II Power Quality and Energy Analyzer front view
Fluke 438-II Power Quality and Motor Analyzer
Fluke 434-II and 435-II Power Quality and Energy AnalyzersFluke 438-II Power Quality Analyzer & Motor Analyzer
DC current   
RMS voltage   
RMS current   
Neutral current   
Compact size for use inside panels   
Status display only   
Setup by laptopSetup by tabletSetup by tablet 
Real-time display of measurements   
On-instrument setupExternal memory (CF, SD or USB stick)External memory (CF, SD or USB stick) 
400Hz frequency measurements  
Basic waveform display   
Fast oscilloscope function   
Phasor diagram   
Power and energy   
Total harmonic distortion   
Voltage harmonics   
Current harmonics   
Power harmonics   
Inrush current (triggered)   
Residential / commercial400Hz frequency measurements 
Inside substationOutside substation / transformerOutside substation / transformer 
Residential / commercial   
Power inverter efficiency   
Energy loss calculator   
< 1,600   
> 3000A (option)   
Long-term RMS loggingLong-term waveform recordingLong-term waveform recording 
Timed snapshots   
Waveform recording   
Automatic transient triggering   
En50160 analysis   
IEC61000-4-30 complianceClass AClass A 
Mains signaling   
Phase sequence components   
Transient capture < 1MHzTransient capture > 1MHz 
Transient capture > 1MHzTransient capture < 1MHz 
Battery operatedPower from the measurement linePower from the measurement line 
Ethernet, WiFi or USBWiFi/USBWiFi/USB 
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