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5 Series MSO Option 5-IMDA Application Datasheet

3-Phase Inverter Motor Drive Analysis

5 IMDA Software Datasheet

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5 IMDA Software Datasheet

Measurements and analysis on three-phase power systems are inherently more complex than on single-phase systems. Although oscilloscopes can capture voltage and current waveforms with high sample rates, further calculations are required to produce key power measurements from the data. Power converters based on Pulse Width Modulation (PWM), such as variable-frequency motor drives, further complicate measurements since filtering and triggering on PWM signals are challenging. Yet for most validation and troubleshooting, understandably their oscilloscope is the instrument of choice for designers. Special software, designed to automate power analysis on inverters, motors, and drives, greatly simplifies important three-phase power measurements on PWM systems and can help engineers get faster insights into their designs. The Inverter Motor Drive Analysis (IMDA) solution from Tektronix helps engineers design better and more efficient three-phase motor drive systems, taking full advantage of the advanced user interface, six or eight analog input channels, and ‘High Res’ mode (16 bits) on the 5 Series MSO. The IMDA solution provides fast, accurate, and repeatable results for electrical measurements on industrial motors and drive systems for AC induction motors, permanent magnet synchronous motors (PMSM), and brushless DC (BLDC) motors. It can be configured to measure DC to three-phase AC converters, such as those used in the electric vehicles.

Key features and specifications
  • Accurately analyze three-phase PWM signals used to drive AC induction, BLDC, and PMSM motors.
  • Unique oscilloscope based phasor diagrams indicate VRMS, IRMS, VMAG, IMAG, and phase relationships at a glance for the configured wiring pairs.
  • Debug motor drive designs by viewing the drive input/output voltage and current signals in the time domain simultaneously with the phasor diagram.
  • Three-phase Autoset feature configures the oscilloscope for optimal horizontal, vertical, trigger, and acquisition parameters for acquiring three-phase signals.
  • Measures harmonics per the IEEE-519 standard or using custom limits.
  • Measures drive system efficiency using the 2V2I (two wattmeter) method.
  • Quickly add and configure measurements through the intuitive drag and drop interface on the 5 Series MSO.
  • Analyze Inverter and Automotive three-phase designs for DC-AC topology.
  • Supports 1-Phase-2Wire (1V1I) and 1-Phase-3Wire (2V2I) under the AC-AC Industrial configuration.

Measurement overview

Three-phase power converters such as variable frequency drives require a range of measurements during the design process. The Inverters, Motors, and Drives Analysis package for the 5 Series MSO automates key electrical measurements which are grouped into three categories:

  • Input analysis
  • Output analysis
  • Ripple analysis

Each of these sections include key measurements which are critical to a motor design.

Input analysis

Input analysis includes the basic measurements used in most power equipment designs. The 5-IMDA solution automatically measures the current, voltage, and power values for different wiring configurations. The measurements can be set to measure 1V1I ( 1-Phase-2Wire), 2V2I (1 Phase - 3 Wire), 2V2I (3 Phase - 3 Wire) or 3V3I (3-Phase-3Wire), and 3P4W (3-Phase-4Wire) to support various supply and motor configurations. Measurements can be performed line-to-line or line-to-neutral, to support delta or wye configurations.

5 IMDA Software Datasheet
Input analysis wiring configuration


Power waveforms are rarely textbook sinusoids. Harmonics measurements break down non-sinusoidal voltage or current waveforms into their sinusoidal components, indicating the frequency and amplitude for each component.

Harmonics analysis can be performed up to 200thharmonic order. The maximum harmonic order can be set to suit your needs by specifying the range in the measurement configuration. THD-F, THD-R and fundamental values are measured for each phase. Measurements can be evaluated against the IEEE-519 or IEC 61000 3-2 standard, or custom limits. Test results can be recorded in a detailed report indicating pass/fail status.

5 IMDA Software Datasheet
Compare harmonics measurements against industry standards or custom limits
Power quality

This group provides critical three-phase power measurements including: frequency and RMS magnitudes of voltage and current, crest factors of voltage and current, PWM frequency, true power, reactive power, apparent power, power factor, and phase angle for each phase.

Voltage and current vectors can be displayed on a phasor diagram so you can quickly judge phase shift for each phase and the balance among phases. Each vector is represented by an RMS value and phase is computed using the DFT method.

5 IMDA Software Datasheet
Easily configure the settings to get insight into the power quality
Output analysis

This group of measurements can help calculate the overall performance of the motor drive system.


Efficiency measures the ratio of the output power to input power for respective input and output V and I pairs. By using the 2V2I method, three-phase efficiency may be measured using eight oscilloscope channels (2 Voltage and 2 Current sources on the input side and 2 Voltage and 2 Current sources on the output side). The solution calculates efficiency at each phase and the total (average) efficiency of the system.

5 IMDA Software Datasheet
Configure wiring and filters to perform efficiency measurements for an Industrial motor
5 IMDA Software Datasheet
Configure wiring and filters to perform efficiency measurements for a DC-AC topology
5 IMDA Software Datasheet
Get complete insight into the overall system efficiency
Phasor diagram

The measurement displays the magnitude and phase angle between Voltage(V) and Current(I) vectors in a phasor plot. The V and I vectors depend on the wiring configuration.

5 IMDA Software Datasheet
Easily configure the voltage and current inputs to display phasor diagrams
5 IMDA Software Datasheet
Unique scope based phasor diagram feature provides the relation between the voltage and current vectors
Ripple analysis

Ripple is defined as the residual AC voltage on a constant DC component (offset). Typically, the ripple component is often small in magnitude relative to the DC component.

The solution measures two types of ripple:

  • Line ripple
  • Switching ripple

Line ripple: The line ripple measures the RMS at the configured line ripple frequency and the peak-to-peak value of the time domain waveform for the configured phases.

Switching ripple: The switching ripple measures the RMS at the configured switching ripple frequency and the peak to peak value of the time domain waveform for the configured phases.

5 IMDA Software Datasheet
Ripple analysis configuration can be set to look into line and switching ripple
5 IMDA Software Datasheet
Detailed ripple analysis being carried out on all three-phases

Report generation

The 5-IMDA software simplifies data collection, archiving, documentation of your design, and development process. It supports the report generation in MHT, PDF or CSV formats with pass/fail results for easy analysis.

5 IMDA Software Datasheet
A sample IMDA test report file with summary, details, and corresponding images


Wiring Configuration
1V1I (1-Phase-2Wire), 2V2I (1 Phase - 3 Wire), 2V2I (3 Phase - 3 Wire), 3V3I (3-Phase-3Wire), and 3P4W (3-Phase-4Wire)
L-L to L-N Conversion
Applicable for 3 Phase-3 Wire (3V3I) 1

1For 3 Phase-4 Wire (3V3I) the connection is always Line to Neutral and for 3 Phase-3 Wire (2V2I), it is Line to Line.

Input Analysis
Power Quality, Harmonics 1, Input Voltage, Input Current and Input Power

1Supports Custom limits

Ripple Analysis
Line ripple, Switching ripple (for Industrial), and Ripple (for Automotive)
Output Analysis
Efficiency 1, Phasor Diagram

1For 2V2I wiring

Three-phase Autoset
For all measurements
Phasor diagram and harmonics bar graph 1

1Range filter as part of measurement configuration.

MHT and PDF format, Data export to CSV format
Degauss/Deskew (static)
Automatic detection of probes, Auto Zero. User can deskew voltage and current probes, degauss the current probe from the menus for each channel
Source support
Live analog signals, reference waveforms, and math waveforms

Ordering information

Product Options Supported instruments Bandwidth available
New instrument order option 5-IMDA 5 Series MSO (MSO56, MSO58)
  • 350 MHz

  • 500 MHz

  • 1 GHz

  • 2 GHz

Product upgrade option SUP5-IMDA 5 Series MSO (MSO56, MSO58)
Floating license SUP5-IMDA-FL 5 Series MSO (MSO56, MSO58)
Recommended probes
Probe model Description Quantity
TCP0030A Current Probes 3 for 3V3I wiring 1
THDP0200 or TMDP0200 High Voltage Differential Probes 3 for 3V3I wiring 1

1For performing efficiency measurement, four quantities are required.