World's Smallest High-precision Power Analyzer

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.

Power Analyzer Data Acquisition System for Power Analysis
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 such as 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 sensor side (channel to the ground), as well as, channel-to-channel and even isolated sensor excitation. Less noise, no ground loops, 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.
  • CURRENT SENSORS: We offer high-accuracy current sensors such as zero-flux current transducers, AC/DC current clamps, Rogowsky coils, and shunts with the power supply out of the box. These sensors are true RMS sensors, available in a variety of models. Some of the features that are available are high frequency, wide bandwidth, DC voltage covering all the needs for power measurements.
  • 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: 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 to ensure that post-processing is always available. 
  • 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 for additional software licenses.

More Than Just a Power Analyzer

The Dewesoft power meters have many advantages compared to conventional power analyzers and provide the most flexible solution for all power analysis calculations as well as 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, on-line, 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 a 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 on 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 as 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 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:

You can also read 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, current, and perform power analysis can be found on our FREE online PRO training:


What is power?

In physics, power is the rate of doing work. It is equivalent to an amount of energy consumed per unit of time. The unit for power is Joule per second [J/s], also known as Watt [W]. The integral of power over time defines the energy (performed work). The power of an electrical system is calculated by multiplying the voltage with the current.

What is the difference between measuring DC and AC power?

Measuring DC power is not as complicated, as the voltage and current are constant, so there is no frequency and  the time interval for the integration just defines the average interval of the power calculation. 

To measure AC systems the periodic time needs to be known. This cannot be done by taking the normal grid frequency (e.g. 50 Hz) as a constant, due to the fact that the grid frequency is ever changing depending on the balance of the energy supply and the electric load at that exact moment. 

What is the difference between conventional and Dewesoft’s Power Analyzer?

Conventional power analyzers use a zero-point detection to determine the periodic time. This means that they evaluate when the voltage or current crosses that x-axis and use that value to calculate the periodic time. Dewesoft Power Analyzer on the other hand uses a special FFT algorithm (Software PPL) to determine the periodic time (frequency). The algorithm determines the periodic time of the signal via a special FFT algorithm using a sampling window of multiple periods. The calculated frequency is highly accurate (MHz) and works for every application (motor, inverter, grid, …).

How Dewesoft calculates the power of an AC system?

Dewesoft calculates power in the frequency domain. With the predetermined period time, an FFT analysis for voltage and current is done for a definable number of periods (typically 10, with electrical applications) and a definable sampling rate. The FFT yields an amplitude for the voltage, current and the cos phi for each harmonic. One major benefit of this FFT transformation is that the behavior of amplifiers, current or voltage transducers in amplitude and phase for the whole frequency range (using the Sensor XML) can now be corrected.

Which wiring schematics does the Dewesoft power module offer?

Dewesoft Power Analyzer can measure DC, 1-phase, 2-phase, 3-phase, as well as 6 to 12-phase special measurements.

There are predefined measurement configurations for DC, Single phase, 2-phase, and various 3-phase configurations (Star, Delta, Aron, V-Connection, 3-phase 2-meter) already available in the Dewesoft X software, for higher phases single phase measurements can be used, and using the mathematics module be added together for totals.

What is needed to measure an inverter?

When measuring inverters always use high-speed amplifiers as the voltage is modulated with switching frequencies up to several hundred kHz, also ensure to use current sensors with high bandwidth capabilities as well as make sure they are capable to measure both DC and AC currents. Do not forget to set the current as of the frequency source and use either a star or delta connection. Never use an Aron or a V-connection for such measurements.

Is Dewesoft Power Analyzer good for E-Mobility measurements?

Dewesoft’s modular DAQ systems in combination with its powerful Dewesoft X software and Power Analyzer can measure all types of applications, also for E-Mobility the Dewesoft bundle is widely used. For example, a 6-phase motor can be measured by using 6 single-phase power modules and calculating the total power in the power module.

Is there a manual for Dewesoft Power Analyzer?

Yes. The extensive Power Analyzer and Power Quality Analyzer manual is available can be downloaded in a form of PDF document.

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