You are here: Evaluating Data > Using the Spreadsheet View > Viewing the Point Display

Viewing the Point Display

In this topic
To View the Live Point Display
To Store Point Display Data
To View Stored Point Display Data
Orthogonal Oscillation Tests

The Point Display provides a “virtual oscilloscope” that allows operators to monitor the stress (torque) and strain (angular displacement) waveforms as they are being generated during an oscillation experiment. This feature visualizes a reduced version of the raw stress and strain data being generated, provides a graphical monitor of the data quality, and allows you to look for signs of distortion in the sine waves. Such distortions are an indication of non-linear behavior from the sample or from sample clipping (which might be due to torque overload or loss of contact between sample and test fixture).

NOTE: The data shown in the point display of an oscillation experiment should not be used to calculate material functions (such as G’, G”, h*, etc.). It is intended as a diagnostic tool to evaluate the quality of the signals.

The Point Display option is available inside the experiment Data acquisition menu for the following test modes:

ARES-G2: Oscillation, Flow Sweeps, and Orthogonal Oscillation (see Orthogonal Oscillation tests for details) except Fast Sampling, Flow Ramp, Flow Temperature Ramp, and Step (Transient).
RSA-G2: Oscillation tests except Fast Sampling, Step (Transient), and Other
DHR/AR: Oscillation tests except Oscillation Fast Sampling, Flow, Step (Transient), and Other.

The data of the point display can be saved with each data point. The Save waveform (point display) checkbox is available in the Data acquisition menu of all oscillation experiments. The Point Display represents a composite of the raw data acquired and can be displayed either as a small graphic with strain or stress versus time or as stress vs. strain with 64 to 1024 data points (depending on the instrument).

The Point Display can be displayed live during an oscillation/flow test or can be retrieved from a TRIOS data file (when saved was enabled) by selecting an oscillation/flow data point in the graph or the table. A symbol representing a graph displays next to the row number of a spreadsheet when the Point Display data has been saved during the experiment.

To View the Live Point Display

While an experiment is in progress, select Point Display from the Instrument Control panel.

To Store Point Display Data

Point Display data collected during an experiment can be stored for later viewing by performing the following instructions prior to running a test:

Set up a new experiment.
In the Data acquisition drop-down menu, select Save waveform (point display).
The TRIOS software will now save the Point Display data obtained in the experiment.
NOTE: This option is available only for applicable test types.

To View Stored Point Display Data

Stored Point display data can be viewed in a Point Display window that can be opened from the Experiment tab. Position the Point Display window to your preference on the TRIOS workspace.

Open the experiment data file containing the saved Point Display data.
Select the Spreadsheet view. Graph icons appear next to the row numbers (as shown below), indicating that there is a saved Point Display for each data point.

With the desired spreadsheet row highlighted, the point is displayed as a graph or table in the Point Display window. Alternatively, double-click the graph icon to display the saved Point Display.
Select between Stress/Strain (below, left) or Lissajous (stress v strain) (below, right) for oscillation data points only. The Stored data option button on the form is selected. Switch between tabular and graph display. When a graph is selected, either stress/strain waveform or Lissajous (stress vs. strain) can be selected. Select Copy to copy the tabular data into another program such as Excel.

Orthogonal Oscillation Tests

When OSP oscillation tests are performed (Rotation and 2D), the raw waveform data are collected for the angular displacement and the axial displacement. The angular live strain/stress data are always shown on the Instrument Control panel. The axial live wave form data (normal stress/strain) are always shown on the alternative Point display used for stored data points viewing. Note that the document with the current experiment needs to be in focus in order to activate the live option button on the alternative Point display form.

Stored stress/strain and normal stress/strain data can also be viewed in this form anytime.