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K_moisture

Dear Mike and others,

Thanks for jumping in Mike, I was thinking you had something to add.  Your
comments about the distance per division (DIST/DIV) setting are true only
if the probe length remains the same.  A longer probe will require a
larger DIST/DIV setting to keep the entire wave form on the screen.  As
long as the DIST/DIV setting and probe length change hand in hand there is
no difference in resolution.  I know that you know this, but others might
misinterpret your remark.  In actual practice the relative propogation
velocity setting (Vp) can be changed as well, to fine tune the wave form
apparent length on the screen, so that maximum resolution and precison of
measured travel times is achieved.  All this relates to use of the
Tektronix cable testers and may not correspond exactly to the settings
available on other TDR devices.

Best wishes, Steve

 
Steve Evett   srevett@ag.gov   http://www.net.usda.gov/cprl/
USDA-ARS, P.O. Drawer 10, Bushland, Texas 79012 U.S.A.
(1/2 mile W., Interstate-40 S. access road)
Tel. 806-356-5775, FAX: 806-356-5750