Re: it's easy to add an external battery at 2465B NVRAM


GerryR <totalautomation1@...>
 

Hello Joseph,
Did you remove the internal battery before / after adding the external battery?
The Test 04 fail probably means your calibration data is corrupt, and once you have replaced the NVRAM, you have to recalibrate the 'scope.

GerryR
KK4GER

----- Original Message -----
From: "Joseph" <joseph.bozzer@skynet.be>
To: <TekScopes@groups.io>
Sent: Monday, January 13, 2020 7:02 AM
Subject: [TekScopes] it's easy to add an external battery at 2465B NVRAM


[color=red][b]Yes, it's easy to add an external battery at NVRAM[/b][/color]

[size=10pt][b]1) I used this Dremel head
Before begin .. insert the NVRAM in a socket to protect his fragile pins !![/b][/size]

[img]https://image.noelshack.com/fichiers/2020/02/7/1578821555-r0159819web.jpg[/img]



[size=10pt][b]2) I started in front of the first "A" of text "DALLAS" ... this is where is located the pin 7 of IC
(Luckily the DS1218 is a old DIL8 case with his large pins which will makes research easier)[/b][/size]

[img]https://image.noelshack.com/fichiers/2020/02/7/1578821954-r0159808web.jpg[/img]



[size=10pt][b]3) Carefully I came down and widen the hole very near of case until i seen the copper appear
(It's the good moment to measure the internal battery voltage between this copper and pin 14 of the NVRAM)
Then i widened it enough to be able to solder a wire[/b][/size]


[size=10pt][b][color=red]Maybe a piece of advice : do not widen it too much on the side of the "D" and "L" of dallas so as not to short-circuit, with the dremmel head, the pins 7 with 6 or 8 of DS1218 because I don't know if that could kill it?.. [/color][/b][/size]


[img]https://image.noelshack.com/fichiers/2020/02/7/1578824834-capture-2020-01-12-a-11-26-01.jpg[/img]


[size=10pt][b]4) I cut the branches of my socket to be able to easily pass the wire
Then I soldered two wires:
- positive on pine 7 of DS1218
- negative on pine 14 of NVRAM[/b][/size]

[img]https://image.noelshack.com/fichiers/2020/02/7/1578825024-r0159817web.jpg[/img]



[size=12pt][b][u][color=red]Result :[/color] [/b][/size]
[size=10pt][b][color=red]Before this operation I couldn't read the NVRAM on my programer and after I could do it .. I was happy![/color][/b][/size]


[size=12pt][u][b]My final solution :[/b][/u][/size]
[size=10pt][b]I decided to keep the original NVRAM equipped of an external battery
For the battery I chose this one on Amazon[/b][/size]

[img]https://image.noelshack.com/fichiers/2020/02/7/1578823314-capture-2020-01-12-a-11-01-33.jpg[/img]

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