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Power analyzer

Dewesoft power analyzer features a high-sampling rate, high-bandwidth, and high-accuracy hardware for power analysis on electric motors, inverters, transformers, switches and any other electronic equipment. The ability to connect other sensors for temperature, vibration, RPM, torque offers a unique solution for modern power analysis solutions.

High Voltage
High Voltage
Strain / Stress
Strain / Stress
CAN bus
CAN bus
High-speed video
High-speed video
Thermal video
Thermal video

Main Features

  • POWER CALCULATIONS: The system will calculate more than 100 power parameters like P, Q, S, PF, cos phi and many others. It also offers full raw data recording capabilities, oscilloscope, FFT, harmonics. All these calculations can be done online or in post-processing.
  • EASY TO USE: The Dewesoft power analyzer offers plug-and-play capability with hardware and sensor autodetection and award-winning Dewesoft X software. Just select input channels and the power analyzer module will do the rest.
  • 1 MS/s SAMPLING RATE: Dewesoft data acquisition hardware features high sampling rate amplifiers with 1 MS per second sampling rate.
  • FULLY ISOLATED: The "worry-free" solution provides isolation on the sensors side (channel to ground), as well as, channel-to-channel and even isolated sensor excitation. Less noise, no ground loops, the best signal quality!
  • 2 MHz BANDWIDTH: DAQ hardware offers 2 MHz bandwidth to cover everything from the fundamental frequency, switching frequency and high signal frequency parts. Software selectable high, low and bandpass filters are available.
  • 0,03 % ACCURACY: We offer high accuracy amplifiers and sensors for voltage and current measurement with accuracy down to 0,03%.
  • 1600 V DC/CAT II 1000 V/CAT III 600 V: Direct input and acquisition of high voltage signals.
  • CURRENT SENSORS: We offer high-accuracy current sensors like zero-flux current transducers, AC/DC current clamps, Rogowsky coils and shunts with the power supply out of the box.
  • UP TO 64 ANALOG CHANNELS IN ONE INSTRUMENT: Data acquisition systems can be configured with up to 64 channels in single chassis solution. Multiple instruments can be synchronized together for the applications with higher channel count requirements.
  • ADDITIONAL INPUTS: Dewesoft power analyzer system can also measure different signals like IEPE; thermocouples, digital, counter, GPS, CAN, XCP, FlexRay, video, etc. all fully synchronized.
  • MOBILE MEASUREMENT SYSTEM: Various data acquisition system configurations are possible with built-in battery power, data processing computer, SSD data logging and display for maximum portability and stand-alone use.
  • ADVANCED ONLINE AND OFFLINE MATH PROCESSING: Dewesoft X offers easy-to-use mathematics engine. Math can be applied in real-time during measurement or post-processing. 
  • RAW DATA: Raw data is always stored for the possibility of any post-processing. 
  • NO HIDDEN COST SOFTWARE LICENSING: Our software licensing is very flexible and has no renewal or upgrade fees. Upgrades for Dewesoft X are FREE forever. You also don't require any additional license to view/analyze the data. Once the data file is stored it can be reviewed and analyzed on unlimited computers without the need of additional software licenses.

One system, all the data

Dewesoft power analyzer brings a lot of advantages to conventional power analyzers and provides the most flexible solution for all power analysis calculations and other measurements and calculations. Benefits of Dewesoft power analyzer:

  • Combination of multiple products into a single device (Power Analyzer, Combustion Analyzer, Oscilloscope, Data Logger, Spectrum Analyzer, CAN logger, etc.)

  • Synchronous acquisition of all data

  • Data storage in one system and one format

  • Combined power analysis and raw data storing

  • Live, on-line power calculation (1ms values)

  • Enhanced power quality analysis​​​​​​​

  • Any number and type of input channels - Voltage, Current, IEPE/ICP, strain, thermocouple, RTD, CAN, etc.

  • Portable and mobile measurement system with SSD, CPU, display, and batteries for stand-alone use

  • Additional sensor software calibration

All these features provide comprehensive power analysis system within one measurement device

Precision power analysis

Dewesoft DAQ devices are unique due to the powerful software which combines the functionality of a couple of different devices and due to compact, flexible and rugged hardware. 

For power analysis, high-accurate amplifiers are absolutely necessary. The SIRIUS high-speed amplifiers for high and low voltage inputs reach new dimensions in accuracy. These amplifiers have a basic accuracy from DC to 1 kHz of 0,03% of reading. This is unique in the power analyzer market, especially at measurements with variable frequency drives where it is absolutely necessary to reach highest-accurate measurement results.

Other manufacturers often provide have high accuracy at 50Hz/60Hz and the accuracy below and above is a lot worse (see chart grey line).

Highly accurate amplifiers

Besides the high bandwidth (up to 2 MHz) and the high sampling rate (1 MS/s), Dewesoft voltage and current amplifiers also offer high base accuracy of 0,03 % and flexible filtering options - 100 kHz, 5th order, Bessel or free programmable digital IIR Filter in FPGA.

For bandwidth requirement of up to 500 kHz, the complete filter chain is bypassed.

For more information see SIRIUS product page.

Sensor correction software

Voltage and current transducers always have a frequency dependent amplitude error and phase shift.

With Dewesoft’s unique software calibration technology amplitude and phase can be corrected for the full frequency range from DC up to 1 MHz (e.g. iron-core clamp, AC/DC clamp, Rogowsky coils, grid current and voltage transducer).

Power analysis

The software provides a visual selection of the different wiring schematics and provides power calculation for all possible connections.

These are single phase, star connection, delta connection, V connection, Aron connection and a combined star/delta connection. All of course with or without currents.

It’s even possible to analyze 6, 7, 9 or 12-phase motors due to the combination of the powerful hardware and software.

Power calculation

The software will automatically calculate and store not only RAW data from the voltage and current transducers but also all the power parameters:

  • P, Q, S, D

  • Cos φ, power factor

  • P, Q, cos φ for each harmonic

Each parameter can visually be displayed in a time recorder, digital or analog display.

Star - delta calculation

Out of a delta connection, it is possible to calculate all the values and the waveform for the star connection and vice versa.

Waveform: U1, U2, U3 < > U12, U23, U31.

Multiple power calculations

It is possible to measure multiple power analysis on one device. E.g. with the Dewesoft R8D DAQ system you can measure 8x 3-phase systems completely synchronous.

It is possible to perform analysis for different frequencies (DC, 50Hz, variable frequency, etc. ) and wiring schematics (1-phase, 3-phase etc.). Any additional mechanical values like torque, speed, noise, temperature, and vibration can also be captured and synchronously analyzed.

Typical configurations:

  • Motor & inverter: 3x 3-phase AC power (var. frequency)
  • E-mobility: 4x 3-phase AC power (var. frequency), 6x DC power
  • Aircraft: 5x 3-phase AC power (400 Hz), 1x 1-phase AC power (50 Hz), 5x DC power
  • Marine: 7x 3-phase AC power (50 Hz), 4x 1-phase AC power (50 Hz), 1x DC power
  • Railway: 1x 3-phase AC power (50 Hz), 3x 1-phase AC power (16.7 Hz), 3x DC power

Frequency calculation

The software PLL guarantees a very accurate frequency calculation (mHz). One system allows to measure multiple power systems and
each can have its own frequency. With the use of the different instruments from Dewesoft, the values can be shown in several ways.

Possible line frequencies

  • 16.7 Hz: Railway Sector
  • 50 Hz: Public Grid
  • 60 Hz: Public Grid
  • 400 and 800 Hz: Aerospace
  • Variable frequency: Inverter (from 0.5 Hz to 3 kHz).

Period values

The Dewesoft power analyzer calculates the following period values:


  • U, I, P, Q, S, PF for each phase and total
  • Symmetrical Components (U, I, P, Q for positive-, negative- and zero sequence system)
  • Definable Cycle Calculation (1/2, 1, 2 or 4 cycles)
  • Overlap of up to 99 % (1ms sliding

Frequency source

Dewesoft system allows you to choose whether you use voltage, current or an external source as the frequency source.

This is a very helpful feature, especially with inverter measurements. Due to the PWM modulated voltage signal, the correct period of time often cannot be determined correctly.

The current is much less distorted because of the high inductance of the motor coil. Therefore it’s too often better to use the current as frequency source with inverter measurements. This feature ensures correct frequency determination for every application.

Oscilloscope and vectorscope


  • Selectable graphs
  • U1, U2, U3, U12, U23, U31: Line to line and line to earth voltages are supported
  • Up to 8 graphs in one diagram
  • Zoom in and out are supported online
  • Waveforms can be stored


  • Vectorscope for 3 phase systems

  • Each individual harmonic can be displayed

  • Multiple vectorscopes can be displayed at once

  • Different power systems can be displayed

  • Direct comparisons of phasors are possible with the "transparent" function

Recorder and X/Y recorder

Dewesoft power analyzer provides a visual recorder displays for time domain data. 


  • Recording of all parameters in individual intervals

  • Individual screens can be defined

  • Zoom in and out, pinch to zoom on multi-touch displays

  • Storing fast (full sampling rate) or reduced (e.g. 600 sec.)

  • Detailed zoom-in to pulse width

X/Y recorder

  • Orbitals can be generated online

  • P over Q as an example for this function

Fault and transient recorder

Dewesoft power analyzer can also be used as fault and transient recorder. Software features advanced triggering capabilities:

  • Trigger on all channels possible (analog, digital, power, math, etc.)

  • Setting a trigger on all parameters of the power module!

  • U, I, P, Q, S, D, cos φ, power factor, etc.

  • Each harmonic

  • Pos-, neg-, zero-sequence systems

  • Very fast glitch detection (up to MS/s)

  • Mathematical channels (rpm, torque, efficiency, etc.)

Math formulas can be used to create combined trigger conditions. When the trigger event happens, data is stored with the fast sampling rate (with pre- and post-time) while otherwise only reduced data (min, max, average, RMS) is stored. This reduces the file size in long-term measurements. For more details visit Dewesoft X storing page.

Sensor calibration and accuracy

Voltage and current transducers always have a frequency dependent amplitude error and phase shift. With Dewesoft’s unique software calibration technology amplitude and phase can be corrected for the full frequency range from DC up to 1 MHz.

All the internal curves like filter response are corrected inside the software and the sensor database includes correction curves for each clamp, Rogowski coil, transformer or whichever sensor is used.

Integrated sensor power supply

SIRIUS MCTS is power supply unit for our high-precision current sensors. MCTS power supply can either fit into R2DB, R3, R4 or R8 DAQ instruments or is available as a stand-alone unit compatible with SIRIUS modular slices.


With increasing demand for energy efficiency more and more electrical equipment needs to be tested. Dewesoft offers very flexible power analyzer solution which can be used for almost all power analysis applications. Here are few under the scope:

Online training

Additional information about how to measure voltage, current and perform power analysis can be found on our FREE online PRO training:

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