12 reviews

Power AnalyzerHigh-precision power measurement and analysis

The Dewesoft Power Analyzer is not only the smallest power analyzer in the world, but it’s also the most powerful one. The flexible hardware platform combined with powerful software features gives unique testing possibilities for any kind of electrical measurement.

Dewesoft power analyzers can accurately measure direct high-voltage and current signals but do not stop there. They can also measure vibration, temperature, GPS/GNSS, CAN bus, video, and many other data fully synchronized.

High Voltage

High Voltage













Strain and Stress

Strain and Stress

CAN bus

CAN bus













High-speed video

High-speed video

Thermal video

Thermal video



Power Analyzer highlights

Power Calculations

The system will calculate more than 100 power parameters such as P, Q, S, PF, cos phi, and many others. It also offers full raw data recording capabilities, oscilloscope, FFT, and 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.

15 MS/s Sampling Rate

Dewesoft data acquisition hardware features high sampling rate amplifiers with up to 1 MS/s per channel sampling rate using SAR analog-to-digital converters with HW filtering capabilities.

5 MHz Bandwidth

SIRUS XHS data acquisition systems offer 5 MHz bandwidth acquisition at a 15 MS/s sampling rate per channel.

Fully Isolated

The "worry-free" solution provides isolation on the sensor side (channel to the ground), as well as, channel-to-channel and even isolated sensor excitation. Less noise, no ground loops, and the best signal quality.

0,03 % Accuracy

We offer high accuracy amplifiers and sensors for voltage and current measurement with a basic power accuracy down to 0,03%.

1600 V DC/CAT II 1000 V/CAT III 600 V

Direct input and acquisition of high voltage signals ±2000V, 1600 V DC/CAT II 1000 V/CAT III 600 V with high galvanic channel-to-channel isolation. 

Current Sensors

We offer high-accuracy current sensors such as zero-flux current transducers, AC/DC current clamps, Rogowsky coils, and shunts which are powered directly from our power analyzers. Sensors are true RMS sensors, available in a variety of models with high frequency, wide bandwidth,  and DC voltage.

Up to 64 Analog Channels in One Instrument

Data acquisition systems can be configured with up to 64 channels in a single chassis solution. Multiple measurement instruments can be synchronized with each other for applications with higher channel count requirements.

Additional Inputs

Our power analyzer can also measure different signals such as IEPE, thermocouples, digital counters, GPS, CAN, XCP, FlexRay, video, etc. all fully synchronized.

Mobile Measurement System

Various data acquisition system configurations are possible with built-in battery power packs, data processing computer, SSD data logging, and a display for maximum portability and stand-alone use. With the built-in battery pack, there is now power consumption from the measurement device on the device under test, making it perfect for field testing.

Advanced Online and Offline Math Processing

DewesoftX measurement software offers an easy-to-use signal processing engine. Math can be applied in real-time during measurement or post-processing. Our power analyzers store raw data so all calculations can be recalculated in post-processing, after the measurement.

Raw Data

Raw data is always stored on the hard drive which ensures that post-processing is always available if needed. 

Software included

Every Dewesoft data acquisition system is bundled with award-winning DewesoftX data acquisition software. The software is easy to use but very rich and deep in functionality. All software updates are free forever with no hidden licensing or yearly maintenance fees.

Dewesoft quality and 7-year warranty

Enjoy our industry-leading 7-year warranty. Our data acquisition systems are made in Europe, utilizing only the highest build quality standards. We offer free and customer-focused technical support. Your investment into the Dewesoft solutions is protected for years ahead.

More Than Just a Power Analyzer

The Dewesoft power meters have many advantages compared to conventional power analyzers. They provide the most flexible solution for power analysis and electrical power and mechanical power measurements. Combined with the power quality analyzer capabilities it is a perfect solution. Major advantages of our power analyzer are:

  • Combination of multiple products in a single device: power analyzer, combustion analyzer, oscilloscope, raw data logger, spectrum analyzer, CAN logger, etc.

  • Synchronous acquisition of all data: electrical data, mechanical data, vehicle bus data, positioning data, video, etc.

  • Data storage in one system and one data file format.

  • Combined power analysis and raw data storing.

  • Live, online, and real-time power calculation (1ms values).

  • Enhanced power quality analysis.

  • Any number and type of input channels: voltage, current, IEPE/ICP, strain, thermocouple, RTD, CAN, etc.

  • Modular and mobile measurement system with SSD storage, fast CPU processor, integrated display, and batteries for stand-alone use.

  • Additional sensor software calibration.

All these features provide a comprehensive power analysis system within one measurement device. No more complications with data synchronization, visualization, storage, or data comparison. The Dewesoft power analyzer solves all these problems.

High Precision Power Analysis

Dewesoft DAQ systems are unique due to the powerful software which combines the functionality of multiple devices packed into compact, flexible, and rugged hardware. 

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

Other manufacturers often have high accuracies at 50/60 Hz but the accuracies above and below these frequency spectrums leave a lot to be desired. Please refer to the grey line in the chart.

Highly accurate amplifiers

Besides the high bandwidth (up to 2 MHz) and the high sampling rate (1 MS/s), Dewesoft’s voltage and current amplifiers also offer a 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 requirements of up to 500 kHz, the complete filter chain is bypassed.

For more information please see the SIRIUS data acquisition system 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).

Different Power Analysis Wiring Schematics

The Dewesoft X data acquisition software provides a visual selection of the different wiring schematics and provides power calculations for all possible connections.

The following predefined power schematics are available: 

  • direct current,

  • single-phase,

  • two-phase,

  • star connection,

  • delta connection,

  • V connection,

  • Aron connection, and

  • a combined star/delta connection.

All of these connections can be measured with or without currents. Dewesoft has the ability to analyze 6, 7, 9, or 12-phase motors due to the modular construction of our measurement devices and multiple synchronized power modules in our powerful software.

To learn more about each connection please navigate to Dewesoft Power Analysis free online training or Dewesoft Power Manual.

Power Calculations

The Dewesoft X data acquisition software will automatically calculate and store not only raw data from the voltage and current channels but also all the power values such as:

  • P, Q, S, D

  • Cos φ, power factor

  • P, Q, cos φ for each harmonic

Each parameter can be displayed visually in a time recorder, graph, or in digital and analog displays. Perfect for harmonic analysis as well as phase power, voltage, current, and many other power visualizations.

Multiple Power System Calculations In Parallel

It is possible to simultaneously measure multiple power systems with a single device. E.g. with the Dewesoft R8D DAQ system up to 8 x 3-phase systems can be measured completely synchronous.

Additionally, it is also possible to perform analysis at 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 measured fully synchronized and analyzed.

Typical configurations and applications

  • Motor & inverter testing: 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.

Accurate Frequency Calculation

The software phase-locked loop (PLL) guarantees a very accurate frequency calculation (mHz).

A single data acquisition system can measure multiple power modules simultaneously, and each module can have an independent frequency. With the use of the different DAQ instruments from Dewesoft, the values can be displayed in several ways.

Possible line frequencies

  • 16.7 Hz: Railway Sector

  • 25 Hz: Public Grid

  • 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 Calculation

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 % (1 ms sliding)

Star Delta Connection 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.

Frequency Source Selection

Dewesoft power analyzer and power meters allow the user to choose the frequency source for the measurement. The measurement frequency source can be either:

  • voltage,

  • current, or

  • an external frequency source.

This is a very helpful feature, especially when performing measurements on an inverter. Due to the PWM modulated voltage signal, the correct period of time can often not be determined correctly.

The current signal is much less distorted because of the high inductance in the motor coil. 

Therefore, more often than not it’s better to use the current signal as a 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

The Dewesoft power analyzer provides 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 the pulse width.

X/Y recorder

  • Orbitals can be generated online.

  • P over Q is an example for this function.

Fault and Transient Recorder

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

  • It is possible to trigger all channels (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.

  • Every individual is harmonic.

  • Pos-, neg-, zero-sequence systems.

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

  • Mathematical channels like rpm, torque, efficiency, etc.

Math formulas can be used to create combined trigger conditions, for any measurement parameters. 

When the trigger event happens, data is stored with a fast sampling rate (with pre- and post-time). For the rest of the measurement only reduced datasets (min, max, average, RMS) are stored. This reduces the file size for long-term measurements.

For more details please visit the Dewesoft X storing page.

Sensor Calibration and Sensor Accuracy

Voltage and current transducers always have a frequency-dependent amplitude error and phase shift. With Dewesoft’s X 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 current clamp, Rogowski coil, voltage transformer, or whichever sensor is used.

Integrated Sensor Power Supply

SIRIUS MCTS is the power supply unit for our high-precision current sensors and transducers.

MCTS power supply slice can either come in rack slide-in slice to fit into R2DB, R3, R4, or R8 data acquisition systems or is available as a stand-alone modular unit compatible with SIRIUS modular slices.

Power Analysis Applications

With the increasing demand for energy efficiency more and more electrical equipment needs to be tested.

Dewesoft offers a very flexible power analyzer solution which can be used for almost all power analysis applications. Here are few under the scope:

  • Motor and Inverter testing

  • Power Transformer testing

  • Standby Power testing

  • Electrical and Lighting testing

You can also read the LED testing application note for more details on how the Dewesoft power analyzer is used for LED light power and efficiency testunbg.

Online Power Analysis Related Training Resources

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

  • Power Solution Manual

  • Current measurement​​​​​​​

  • Voltage measurement

  • Power analysis

  • Power quality​​​​​​​

  • What is Power Analysis and Electrical Power Measurement With Power Analyzer?

  • Current measurement in data acquisition applications

  • Voltage measurement in data acquisition applications

FAQFrequently asked questions

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