External Tools: TachTool

This program allows a user to:

• Create a tachometer from an NVGate FFT waterfall. With this new tachometer computed, you can extract any order from FFT waterfall.
• Edit an existing tachometer.

Download

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NVGate project demo data

ExtractTacho

Package composition

• NVGate add-on tool "ExtractTach": ExtractTach.exe
• This Add-on works with NVGate V12 or upper and option FFT-Diag

Configuration

The add-on "ExtractTach.exe" is located within NVGate installation directory.

It is recommended to add a shortcut of this exe file in the "Link" directory (C:\OROS\NVGate data\Links) to have direct access from NVGate in Link Section.

Principle

From NVGate, load the project containing the measurement you want to edit. "Tach extract" will scan all the measurement in your active project.

The measurement parameters fields must be filled in:

"Measure name": select the measurement where the waterfall is located

"Waterfall": Select the waterfall where you need to extract the tachometer.
"Output": A new waterfall will be created after extracting the tachometer. This will be the name of this new tachometer.

Create a tachometer

First of all, the tachometer must be drawn or computed, then you will be able to display it and insert it into NVGate measurement.

Select draw tach to create a tachometer from a waterfall. It will display the waterfall that you have chosen and allow you to draw a tachometer on it.

On this view, you will have to draw, with a mouse click, the order.

Click on "CTRL+Z" to remove the last point that you have drawn.
You can change the display in "Logarithm" or "Linear" to help you to draw the tachometer if needed.

These are the display options for zooming and changing the display

When this is done close the windows with the cross. It will automatically save what you have drawn.

Select the order number that you have drawn. We need this information for being able to recompute the tachometer.

Select the algorithm:

• Max around drawn (advice): will search the maximum around the drawn tachometer in a window around it.
• "Same as Drawn" will put exactly the same that you have drawn.

Display this new tachometer with "Display draw tach".

Then you show the tachometer profile that you have computed.

Finally, "Insert tach" will create a new measurement into NVGate with a new tachometer associated as reference.

You can change the reference and insert the calculated tacho.

Also select the calculated tachometer on "Select tacho" panel for order extraction.

Edit tachometer

This function allows to edit a tachometer, and particularly to linearize it in a zone.

Once a result is selected into "Measurement Parameters", all existing tachometers will be added into the combo box and you can select one of them.

The associated tachometer profile can be display with "Smooth tach" button as below:

If it’s needed to remove a part of the profile, or linearize it because inconsistent pick, just click at the beginning of the wanted zone, and then at the end, it will display a red area:

Then, the "Ctrl+a" shortcut will linearize the area, using the start and end value of the area:

The window can now be closed and the edited tachometer inserted into NVGate via "Insert" button.

Notes

1) This program is delivered free of charge for NVGate V12 and later with FFt-Diag option. Support is not automatically provided on this tool.

2) For any other requests, please contact your local distributor or the OROS Customer Care department.