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Stripchart Guide

Read on for assistance with the VIP Viewer stripchart displays.

Activating The Stripchart Display
The Stripchart display appears following a successful data download from the VIP. The Stripchart activated by the Download task shows data from one run. The Stripchart also appears after the user activates the Archives Task. The Archives task shows the Stripcharts and can contain data from either one or two events.

Zooming (The Short-Cut Method)
Zoom in on an event by following these steps:

  1. Press and hold the CTRL key
  2. Press and hold the left mouse button
  3. Drag the mouse around the stripchart data

Using this method to zoom in on the data is much faster and gives you the ability to zoom in much tighter than using the Stripchart Handles.

Zooming And Scrolling
Stripchart Handles allow resizing of the X and Y axes. Resizing enables the user to zoom in on any part of the plot. Stripchart Handles also support data scrolling for panning from time = 0 to the end of an event. Using the Handles to zoom in on data can be tricky at first. Following is an example that uses two Handle moves to zoom in on a small section of data.


Figure 1. Original Stripchart Data Without Zoom.

Start by choosing the data to zoom in on. Figure 1 shows the data of interest on the top Stripchart extending from about time = 3:15 to 3:40.

Figure 2. Stripchart Showing the Results of Step 1 Moving the Right Handle.

Now for Step 1: Use the Mouse and grab the Right Handle. Drag the Mouse to the left until the data at time = 3:40 slides up against the right of the Stripchart.


Figure 3. Stripchart Showing the Results of Step2 Moving the Left Handle.

Step 2: Grab the Left Handle and drag the Mouse to the right until the data at time = 3:15 slides up against the left of the Stripchart. Now, place the Mouse Pointer between the Left and Right Handles then click and drag left to scroll to the end of the data or click and drag right to scroll to the beginning of the data.

Vertical and Horizontal scrolling is also controlled by pressing and holding the Left Mouse Button anywhere on the Stripchart and dragging the Mouse up, down, left, or right.

Sliding one record of chart data is an effective way to compare data. Data sliding can only be enabled under the Archives Function when viewing data from two separate records.

Begin the process by clicking Archives from the Main Toolbar. Select the first data record by checking the box to the right of the record name. The first record selected will remain "stationary" during the sliding process. Check a second box to the right of the next data record to be displayed. The second record selected will be "movable" during data sliding. Click plot to display the Stripcharts.

The Engine RPM Histogram Display
Figure 4 shows engine RPM data on top and the corresponding RPM histogram data on bottom. The histogram plot is just a different format for displaying the RPM numbers. Notice the histogram horizontal (x) axis is marked off in RPM and the vertical (y) axis shows the number of recorded data samples. The histogram's power is in displaying what percentage of time the engine is running in a certain RPM range.

Histogram Example

Figure 4. Engine RPM Histogram.

Each blue vertical bar represents a span of 100 RPM. For example, take a look at the tallest bar which is centered around 8400 RPM and extends from 8350 to 8450 RPM. The histogram is showing us that 22 engine RPM samples were gathered from the RPM data that were in the range of 8350 to 8450. This can be useful to show where the engine runs during different phases of the race. Of course, when the throttle is held wide-open, the histogram will show if the engine is running at the peak of the horsepower curve.

Measuring Time Differences
Figure 5 shows a graph of the jackshaft RPM as the sled accelerates from a dead stop up to the "roll-over" point.

Cursor 1 and 2 Example

Figure 5. Measuring Time Deltas Using Cursor 1 and Cursor 2.

The first and second cursors are used to measure the time difference from clutch engagement to roll-over. Start by dragging Cursor 1(the black cursor) to the point where jackshaft just starts to turn. Enable Cursor 2 by clicking on the Cursor 2 command button. Cursor 2 Press and hold the ALT key and at the same time, click and drag the mouse. This will cause Cursor 2 (the blue cursor) to move. Drag Cursor 2 to the position of jackshaft roll-over. The cursor time difference is displayed near the top-center of the stripchart.

Multiple Storage Locations For Event Files
There are now five folders available for saving recorded events. Selecting the Archives function displays the screen shown in Figure 6. Each folder can be renamed to fit your needs. This capability makes the task of organizing your event files easier.


Figure 6. Archives Screen Showing Five Folders For Event File Storage.

Comparing Data From Two Events
Enable data sliding from the Stripchart Display Window by clicking Chart Options->Cursor Mode->Slide Data. Zoom-in on a desired portion of the stripchart data using the Handles. Right-click a point on the graph and while holding down the mouse button, drag the plot left or right to the desired location. In addition, the Left and Right Arrow Keys or Comma and Period Keys are used to move the Cursor in increments of 1/4 of one sample period (10 milliseconds).

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