[SI-LIST] Re: Waveform Measurements
- From: "Martin Euredjian" <martin@xxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 5 Dec 2002 23:19:31 -0800
> >Does anybody know if there is any way to make
> measurements on waveforms
> >saved as images in the lab.
If you have AutoCAD:
Copy your image to the clipboard.
Paste in AutoCAD as an image entity (use /Edit/Paste Special)
Accept all defaults for scale, rotation, etc.
Type SCALE (or use a menu)
Select the image entity
Select a base point (anywhere in the image will do)
Type R to use a reference length
Click on two points that are a known distance apart. For example, if the
scope's cursors are visible, click on two points along the appropriate axis.
Let's say you wish to measure time in ns. Click on the two points. This
will give AutoCAD their current distance. Let's say that's 0.237
Now enter the distance in your units (nanoseconds), let's say 200.
AutoCAD will scale the image to put those two points exactly 200 units
apart. Now you can use the DIST or any other dimensioning command to take
your measurements. You can even trace over the waveform if you wish and
turn it into a polyline that you could extract via AutoLISP or VB into a
comma delimited file or even Excel.
Other CAD systems might have similar capabilities.
Give it a shot.
===============================
Martin Euredjian
eCinema Systems, Inc.
voice: 661-305-9320
fax: 661-775-4876
martin@xxxxxxxxxxxxxx
www.ecinemasys.com
===============================
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