Hugo Holden
Veteran Member
The Dallas DS1225 is used in the Tek 2465B and occasionally it turns up in other computer based apparatus. I have used my 2456B in every computer repair I have done.
It has been over 10 years since I published the paper on the Dallas RAM issues in the Tek 2465B scope.
( this was the article : https://www.worldphaco.com/uploads/...SCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf )
The solution I decided on then was to switch in FM16w08 FRAM. Over that time, since I did the first one, in my daily use 2465B, I have been monitoring the FRAM, including its calibration constants, and the good news is that they remain unchanged over this time frame. Which is a reassuring report for people who changed to FRAM.
Out of all the projects and papers I put on my website, it was this one that garnered the most feedback, from places such as Technical Institutes, Universities, Research centers and private users around the world wanting to keep their Tek scopes running. Likely because users of scopes like the 2465B tend to fall in love with them.
Overall though (for a few reasons) my opinion is that the DALLAS RAM is the better part, that is if only its battery problem was solved once and for all.
The technique of applying an external battery to the DS1225 was not a good solution, because the internal discharged battery has electrical leakage and it drains the added battery in a year or two.
The Dallas DS1225 is an interesting problem to solve. It just goes to show that many problems we confront can be in the field of electronics engineering, or mechanical engineering and sometimes we could choose either solution or a mixture of both.
What I have devised here is a mechanical method to immortalize the DS1225, without any special tools, other than a simple hand made jig and a drill press and some readily available ebay milling tools and some scissors:
It has been over 10 years since I published the paper on the Dallas RAM issues in the Tek 2465B scope.
( this was the article : https://www.worldphaco.com/uploads/...SCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf )
The solution I decided on then was to switch in FM16w08 FRAM. Over that time, since I did the first one, in my daily use 2465B, I have been monitoring the FRAM, including its calibration constants, and the good news is that they remain unchanged over this time frame. Which is a reassuring report for people who changed to FRAM.
Out of all the projects and papers I put on my website, it was this one that garnered the most feedback, from places such as Technical Institutes, Universities, Research centers and private users around the world wanting to keep their Tek scopes running. Likely because users of scopes like the 2465B tend to fall in love with them.
Overall though (for a few reasons) my opinion is that the DALLAS RAM is the better part, that is if only its battery problem was solved once and for all.
The technique of applying an external battery to the DS1225 was not a good solution, because the internal discharged battery has electrical leakage and it drains the added battery in a year or two.
The Dallas DS1225 is an interesting problem to solve. It just goes to show that many problems we confront can be in the field of electronics engineering, or mechanical engineering and sometimes we could choose either solution or a mixture of both.
What I have devised here is a mechanical method to immortalize the DS1225, without any special tools, other than a simple hand made jig and a drill press and some readily available ebay milling tools and some scissors:
