Looking for the NVRAM address for number of hours and power-ons in TDS3000B - Page 1
Forum section: electronics / testgear

author: analogRF
author_rank: Super Contributor
timestamp: August 16, 2020, 06:42:00 pm
content: I recently replaced the DS1742W on my TDS3054B with a NOS which is still old but the battery is good for now. It's on a low profile socket so I candeal with it again if it failsHowever, the problem is when I read my old chip with GQ-4x4 programmer and transferred the data to the new chip, it seems everything were written OK except the number of power-on and hours of operation. I read the old chip multiple times and wrote back into new chip with the same effect.Does anybody know at what address (and what format) these two pieces of data are written in the DS1742W?Thanks

author: analogRF
author_rank: Super Contributor
timestamp: August 16, 2020, 07:00:16 pm
content: ...or maybe there is a command (through the LAN port) that I can set those two numbers to values that I remember from before replacing the chip?

author: james_s
author_rank: Super Contributor
timestamp: August 17, 2020, 12:49:51 am
content: I don't know if the B series is different, but in the non-letter TDS3000 series the power on hours in minutes are stored in the Dallas NVRAM at locations 7E0-7E4. The number of power ons is stored elsewhere and remained without any effort on my part when I replaced the NVRAM. Note the address range I mentioned is the address range within the NVRAM itself outside of the scope, I have no idea what address range the NVRAM occupies in the scope.

author: analogRF
author_rank: Super Contributor
timestamp: August 17, 2020, 11:02:00 am
content: Quote from: james_s on August 17, 2020, 12:49:51 amI had already seen your post herehttps://www.eevblog.com/forum/repair/tds3014-adventures-(seeking-75-75mhz-oscillator)/but that address didn't work. I played with the binary number at that address but it didnt change the power on hours. Curiously it didnt seem to have any other effect either!

author: james_s
author_rank: Super Contributor
timestamp: August 17, 2020, 04:23:51 pm
content: Quote from: analogRF on August 17, 2020, 11:02:00 amSounds like they changed things around in the B series then, I've never owned one of those so I won't be much help there. You could do what I did to determine this though and pop the NVRAM out to read it, put it back in and run the scope for several minutes and then take it back out and read it again. The time registers at the top will change for sure but there shouldn't be any other changes except for the power on hours unless you fiddle with anything else.

author: analogRF
author_rank: Super Contributor
timestamp: August 17, 2020, 07:28:55 pm
content: isn't there any remote command that can do the job? I know on some other (more modern) tek scopes such as DPO3000 for examplethere is a back door command that can set the number of hours (or power ons? I dont recall exactly which one)

author: james_s
author_rank: Super Contributor
timestamp: August 18, 2020, 06:29:11 am
content: I'm sure there is, I've never found it though. These things are unfortunately very poorly documented in terms of service info.

author: xmjacky
author_rank: Contributor
timestamp: August 29, 2020, 03:18:58 pm
content: the power-on hours are simply stored as the number of minutes in hex format in locations x7E0 in the DS1742W, twiceHEX: 0E 1B = DEC:36113611/60=60.183 hours

author: analogRF
author_rank: Super Contributor
timestamp: August 29, 2020, 03:24:50 pm
content: Quote from: xmjacky on August 29, 2020, 03:18:58 pmare you sure it is the same for TDS3000B?

author: xmjacky
author_rank: Contributor
timestamp: August 30, 2020, 08:48:29 am
content: yes

author: voltsandjolts
author_rank: Unknown
timestamp: August 30, 2020, 09:50:09 am
content: BTW you can just install a new blank DS1742W. I did. Works fine.

author: analogRF
author_rank: Super Contributor
timestamp: August 30, 2020, 10:33:29 am
content: Quote from: voltsandjolts on August 30, 2020, 09:50:09 amthen what numbers does it show for power on hours and power cycles?what source did you get the DS1742W from?

author: xmjacky
author_rank: Contributor
timestamp: August 30, 2020, 01:44:39 pm
content: Quote from: analogRF on August 30, 2020, 10:33:29 ampower cycles count are not stored in ds1742w

author: analogRF
author_rank: Super Contributor
timestamp: August 30, 2020, 01:51:42 pm
content: Quote from: xmjacky on August 30, 2020, 01:44:39 pmwhen I replaced the chip it reset to zero so it must be in there, but the number of hours became a random huge number....replacing with a blank chip seems interesting but I wonder what numbers will show up as power cycle and hours.any good source for DS1742W that still has juice for a few years?

author: xmjacky
author_rank: Contributor
timestamp: August 30, 2020, 02:04:55 pm
content: [ Specified attachment is not available ]Quote from: xmjacky on August 30, 2020, 08:48:29 amData read by TDS3014B=1112 hours

author: xmjacky
author_rank: Contributor
timestamp: August 30, 2020, 03:03:00 pm
content: if you want to clear the power cycles count and power on hours, After entering the development mode, select Misc > > Devel init, and exit the development mode at the same time.The way to enter the development mode is to press and hold the 'SELECT' key and then power on.For demonstration, I erased the data of my TDS3064B

author: analogRF
author_rank: Super Contributor
timestamp: August 30, 2020, 03:08:45 pm
content: Quote from: xmjacky on August 30, 2020, 03:03:00 pmThanks. very good infoonly if you could find a way to set the number of power cycles!

author: analogRF
author_rank: Super Contributor
timestamp: August 30, 2020, 03:25:51 pm
content: Quote from: xmjacky on August 30, 2020, 03:03:00 pmjust reset everything back to zero (including the front end relay switch counts ! but I didn't know what they were anyway)now only if I could set the power cycle number to the roughly correct value that I remember ....

author: voltsandjolts
author_rank: Unknown
timestamp: August 30, 2020, 04:05:47 pm
content: xmjackyWhich USB<>Floppy converter are you using? Does it work OK?

author: xmjacky
author_rank: Contributor
timestamp: August 31, 2020, 03:38:19 am
content: Quote from: voltsandjolts on August 30, 2020, 04:05:47 pmYes, this USB < > floppy converter works normally, including firmware upgrade.I bought several in China's Taobao. Only this one can be used normally.https://item.taobao.com/item.htm?spm=a1z09.2.0.0.71802e8dK6yRmG&id=531635840626&_u=v1hevc711ef

author: james_s
author_rank: Super Contributor
timestamp: September 08, 2020, 09:08:08 pm
content: Quote from: analogRF on August 30, 2020, 01:51:42 pmNope, they're obsolete and NLA, ALL of the ones from China are either counterfeit (that don't work properly) or old pulls that have been re-marked with current date codes. Your options are cut the battery out and replace it to give your original part a new life, or make an adapter like I did to install the still-available DS1744, just make sure you get the 3.3V variant.https://github.com/james10952001/DS1744WP-to-DS1742W-adapter

author: darkstar49
author_rank: Frequent Contributor
timestamp: September 10, 2020, 09:07:06 am
content: Quote from: xmjacky on August 29, 2020, 03:18:58 pmHey !! There is 'pacman' again (picture)... need to dig into this... I was looking for the 'PacmanBuildView' mode in another thread, which enables to reset the counters, btw...