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Analyzer

Access additional graphing capabilities

Gain a deeper understanding of complex relationships between signals that are not readily apparent in basic graphs. The optional Analyzer module enhances Sine, Random, and Shock tests by comparing the characteristics of two or more signals in a series of graphs. It includes additional graphing capabilities, plots, configurable function generators, and more.

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Advanced Graphing Functions

With Analyzer, data can be displayed in a number of advanced graphing functions, including transfer function, total harmonic distortion, coherence, and cross-spectrum. The available graphs are dependent on the test type.

Analyzer also offers a configurable function generator for outputting user-defined voltage waveforms. Pretest uses a low-level drive signal and uses the control and response channels to predict the requirements at full level. Intelligent startup uses the information from the pretest in the full-level control algorithm.

Watch: Analyzer Functions Webinar

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Analyzer Functions

Sine

Graphs

  • Scatter Plot
  • Spectrum
  • Transmissibility vs Phase
Test Settings

  • Pre-Test
  • Analyzer with Swept THD Option
  • Open-Loop Waveform Synthesis Scatter

Random

Graphs

  • Cross Spectrum
  • Scatter Plot
  • Transfer Function
  • Coherence
Test Settings

  • Pre-Test with Memorized Drive (Version 2014 and Newer)
  • Open-Loop Waveform Synthesis

Shock

Graphs

  • Transfer Function
  • Coherence
Test Settings

  • Pre-Test with Memorized Drive; Classical Shock Only
  • Transfer Function Parameters; Transient Capture Only

(Version 2014 and Newer)

Field Data Replication (FDR)

Graphs

  • Cross Spectrum
  • Scatter Plot
  • Transfer Function
  • Coherence
Test Settings

  • Open-Loop Waveform Synthesis

Understanding Waveform Relationships

Fast Fourier transform (FFT) and power spectral density (PSD) mathematics are powerful tools for analyzing the characteristics of a waveform. In addition to FFT and PSD, there several types of mathematics used to understand the relationships between two or more waveforms.

To learn more, please enroll in our VRU course Mathematics for Understanding Waveform Relationships.

Transfer Function (Random & Shock)

The transfer function uses two graphs to compare:

  • Ratio of PSD values for two signals across a specified frequency range
  • Phase relationships between the two signals

Use the transfer function graph to determine phase relationships between two signals.

Coherence (Random & Shock)

Identify the relationship between the response signal and drive signal. Two signals are coherent if they have a constant phase difference and the same frequency and waveform.

Total Harmonic Distortion (THD) (Sine)

Determine the amount of harmonic content in a signal by comparing the accelerations at a specific frequency with the accelerations at the next ten harmonics. THD can be used to measure how well a shaker recreates a signal from the controller.

Cross-Spectrum (Random & Shock)

Compares one signal with another signal in time. The Cross-Spectrum graph contains data on the differences in amplitude and phase of the two signals.

Pre-Test

The pre-test feature is available only with Analyzer. Pre-test applies a low-level, open-loop output to the shaker and then uses the output and the measured response to predict the amplitude levels of the full-level test.

Watch: Analyzer Functions Pre-Test

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