Not all the Dallas Semiconductor NVRAM are available, some of them are obsolete or they are very expensive.
The DS1250Y costs between $58 and $62 if is in stock.
The DS1486 is not available from reliable sources.
Those 2 parts are used on most of the TDS6xx scopes :(
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--- In TekScopes@..., "Rob" <rgwood@...> wrote:
?€?I cannot understand guys, WHY BOTHER??€?<<<<
The key to this one is to understand that?€??€?by claiming to save a couple of bucks we can easily justify the repair taking 3 to 5 times as long to implement than is should?€?.. thus turning a 1 (maybe 2) beer repair (time wise) into a full six pack minimum. With the added possibility of another 6pack in consultation with an ?€?expert?€?
Hopefully helpful
Rob
(now hopefully I don?€?t lose my man club card do to letting out some insight)
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Sergey Kubushyn
Sent: Sunday, March 17, 2013 5:56 PM
To: TekScopes@...
Subject: Re: [TekScopes] Re: Replacement to DS1230AB Lithium backed NVRAM
On Sun, 17 Mar 2013, Gala Dragos wrote:
I can not understand guys, WHY BOTHER?
You can get DS1230 from Mouser for something like $15 (I purchased one a
week ago to replace DS1225Y in my 2467B scope.) You will get a real thing
that you can just swap in and forget for the next 10 years. And you can
transfer the original chip content to the new one easily so you won't have
to recalibrate.
What are you trying to save here? A buck? Whopping two bucks? Is it worth a
trouble and all that work involved?
You could add extra logic and a counter to switch between fram chips and increase the mtbf time, or even better make your own NVRAM.
Oh, and if you keep the fram at 25 degrees Celsius you will probably get 10 times more write cycles.
--- On Sun, 3/17/13, bravovb <vbingei@... <mailto:vbingei%40yahoo.com> > wrote:
From: bravovb <vbingei@... <mailto:vbingei%40yahoo.com> >
Subject: [TekScopes] Re: Replacement to DS1230AB Lithium backed NVRAM
To: TekScopes@... <mailto:TekScopes%40yahoogroups.com>
Date: Sunday, March 17, 2013, 8:54 AM
Mr. Silva,
Its been a while. How is the 2465B going with FRAM ?
--- In TekScopes@... <mailto:TekScopes%40yahoogroups.com> , "Victor Silva" <daejon1@> wrote:
I have found that the FRAM devices are not a viable option in the
243X/40. Sadly I must report that what looked like a very promising
alternative to the DALLAS RAM/Lithium cell combo has turned out to be
a dead end.
I have been testing for over one month now on a 2430A, 2440 and 2465B
and everything seemed fine. My last test was to actually determine
the read/write frequency to the device.
It turn out a 2430A writes to the battery-backed devices as often as
once every microsecond. Since the FRAM device as a maximum of 10^10
read/write cycles (before it loses its NV capability) a quick
calculation reveals that the 2430A scope will render the FRAM device
a volatile device in one to three months.
For now I can only recommend the DALLAS (or other vendors)
RAM/Lithium cell combo pack device for use in Tek scopes.
Sorry for getting everyone's hopes up for a more inexpensive
replacement for NVRAM.
--Victor Silva
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