Products > Test Equipment
Tek TDS3000 series and Dallas NVRAM
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MarkL:
Thanks for the info on the NVRAM, voltsandjolts!

It's good to know design mistakes of the past don't always repeat themselves.
voltsandjolts:

@HighVoltage
"Did you replace it with the same "Dallas DS1742W-150 Timekeeping RAM" or are there alternatives?"

Yes, I used that Dallas part. Not cheap.
prot_brot:
Will DS1642 work? it has the same 2k x 8 ram and pinout as the DS1742 at half the price
Jwalling:

--- Quote from: MarkL on September 25, 2014, 04:10:03 pm ---I was performing a minor repair on a TDS3054 (not B or C version), and I noticed a "Dallas DS1742W-150 Timekeeping RAM" soldered onto the main board.  The date code is 1999, and the Dallas datasheet claims a minimum of 10 year life expectancy for the battery.

Does anyone know if the cal data or other critical information is stored there?  Is there any known backup procedure besides unsoldering it and reading it out on a programmer?  Perhaps via the GPIB?

Has anyone seen any TDS3000 NVRAM go bad?

Given the actual lifetime reported on other Dallas NVRAM parts in other scopes, I probably still have many years left before I have to deal with it, assuming I keep the scope that long.


--- End quote ---

Had an opportunity to read out the contents of the Dallas chip in a TDS3014B
Is it possible that there is a back-door into these? I'm no hacker, completely clueless even.  :-//

I've attached the binary as well.

EDIT: Typo. Always a friggin' typo!
Jay
CNsam:
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