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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Dave, The Tektronix 1502 may be powered from a 12 VDC power supply in lieu of the internal, removable battery pack. Normally, when inserted into the 1502 case, the battery pack plugs into a duplex (dual inline) banana plug that is built into the 1502. We have used a dual inline banana plug adapter from Radio Shack (no. 247-717) to rig up an adapter for 12 VDC power from lead-acid batteries, solar power system, electronic power supply, etc. The 1502 uses about 1 Ampere at 12 VDC, so make sure the power supply can deliver this much current. We bolt the dual inline banana plug to the inside of a 13-cm length of 4.2-cm outside diameter PVC plastic pipe (see attached JPEG photos). The wire from the power supply is attached to the screw terminals of the dual inline plug adapter. The length of PVC pipe allows us to push the adapter onto the banana plugs inside the cable tester. If desired, it is easy enough to add a circuit to allow the computer to turn the power on and off. We built the circuit on a piece of perf board, and cut a slot in the PVC pipe to hold the perf board in place (see attached JPEG photos). Details of the circuit are given on our web site at http://www.cprl.ars.usda.gov/programs/ We have also rebuilt the nickle-cadmium battery packs using C-size NiCd cells. This is a lot of work; and NiCd cells with soldering tabs are needed (difficult to find in some places). We used Panasonic batteries purchased as part no. P190T-ND from Digi-Key Corp. (218-681-6674, FAX: 218-681-3380). But, if you need the battery pack for portable use of the 1502, this is one way to go. Hope this is helpful, Steve At 09:27 AM 3/6/2001 +0000, you wrote: > >Steve, saw your post on the tdr and wondered if you had any luck >with the batteries on your tdr. I recently acquired a 1502 and can't get >it to power up. Are the batteries required to power it? My batteries >are super dead. Any help you could give would be appreciated. Thanks > >Dave Cox > ___________________ Steve Evett, Soil Scientist USDA-ARS, 2300 Experiment Station Rd., Bushland, TX 79012 USA 806-356-5775, FAX: 806-356-5750 srevett@cprl.ars.usda.gov, http://www.cprl.ars.usda.gov/programs/ Attachment Converted: "c:\WINDOWS\Desktop\games\New Items\MVC-008F.jpg" Attachment Converted: "c:\WINDOWS\Desktop\games\New Items\MVC-002F.jpg" Attachment Converted: "c:\WINDOWS\Desktop\games\New Items\MVC-007F.jpg" Attachment Converted: "c:\WINDOWS\Desktop\games\New Items\MVC-001F.jpg"