In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Chris Savage wrote:

Patrick,

  I'm glad you got it working.  As per our conversation, and so everyone knows in tring to determine the voltage drop there are two ways this could be accomplished with our scope.  One is to measure the voltage on one side of the resistor (in relation to Vss/ground) and then the other side (again in relation to Vss).  The first signal could be saved as a reference wave form and then compared with the new reading.  You can use the cursors to measure the voltage drop by positioning them at each reading.  The other way is similar but instead you use both channels of the scope and again use the cursors.  The problem you had I believe was related to causing a ground loop since the ground lead was connected to a different spot on the circuit essentially changing the level of ground.  This can be a problem on any scope when the ground is at a level other than what it should be.  In theory you could cause a short through a virtual ground loop through the power lines.  Hard to explain but that can happen.

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=128222#m128317

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)