�From:�	Craig H. Benson (tdr-l)
�To:�		tdr-l@listserv.acns.nwu.edu
�Date:�	Wednesday, July 31, 1996  2:27 pm
�Subject:�	1502B Lithium Battery

Amir

We have been plagued with that problem in every 1502B we have. Batteries
are supposed to last 7 years, but ours usually last 0.5 to 1 yearin the
field.  In our field units, I have replaced the lithium batterywith power
from the CSI power supply unit on the back of the 1502B.  Thecurrent draw
is continuous, but is so low that datalogger battery usage is nota
problem.  This eliminates the problem permanently.

The hook up is fairly simple, and your electronics tech canprobably wire
it up for you.  If you need detailed information, I can have ourtech
sketch up the wiring he did, and fax it to you.

Craig Benson
University of Wisconsin-Madison


>Hello everyone,
>
>I am working with the Tektronix 1502b with Campbell interface.
>The system is working automatically in the field reading every 2hours.
>Inside the TDR on the main board there is a lithium battery (3.5v , 750
>mAH) that should last for 10 years. In the past 4 years I had tochange 3
>batteries.
>
>Does anyone working with this kind of system had the sameproblems.
>
>Amir
>Amir Polak
>Dept. of Soil and Water
>Faculty of Agriculture
>The Hebrew University of Jerusalem
>P.O. Box 12
>Rehovot 76100
>Israel
>Tel (08) 9481993
>Fax (08) 9475181
>Email polak@agri.huji.ac.il
Craig H. Benson
Dept. of Civil and Environmental Engineering
University of Wisconsin-Madison
1415 Engineering Drive
Madison, WI  53706

Phone: (608) 262-7242
FAX: (608) 262-5199
Mobile: (608) 444-0007