TDS7054 SPC memory store

Hello,<br> <br> When I switch on the TDS7054 there is an offset on several chanel, when I pass SPC offsets are compensated. But after switch off and on the offsets appear again. Is there any memory where SPC results are recorded as old TDS7XX?<br> <br> Rdgs<br> <br> Vincent

Hi Vincent,<br> <br> I can't quite confirm that the SPC data is saved in NVRAM, but that's what it sounds like from your symptoms.<br> The TDS7000 (and several other models) use an NVRAM chip with an internal battery which can go bad after many years. In the case of the TDS7000, this chip is <tt>DS1245Y</tt>.<br> <br> Replacement and even some repairs/modifications of these chips are not unheard of.

Hello Afonso,<br> <br> Are you sure?<br> I think it is not NVRAM, because on the TDS7054 when the NVRAM battery is empty, the boot data is lost and the TDS7000 freezes on the Tektronix boot screen. I changed the battery for this reason. Unless the data I wrote on NVRAM are not completly correct. Do you know the data I have to write by console port?<br> Vincent&#160;

<p>Hi Vincent,</p> <p></p> <p>The battery for the NVRAM is inside a DIP32 package (DS1245Y), are you saying you replaced this?</p> <p>There will also be a normal coin cell type battery on the mainboard, usually for the real time clock, but that is another system and not related to the NVRAM where SPC data might be stored.</p>

Hi,<br> <br> Yes I replaced the battery of NVRAM DS1245YP, it was easy because the package is not DIP32 but PWRCP.&#160;Do you know the exact data I have to write by console port?

Hi Vincent,<br> <br> I apologize, the TDS7054 does indeed save SPC to disk, not NVRAM.<br> This suggests that it's somehow not able to write to disk? I would try saving files to disk and see if that works.<br> <br> I am not quite sure what you mean by &quot;data I have to write by console port&quot;, could you clarify that?

Hi Afonso,<br> <br> Explaination of&#160;&quot;data I have to write by console port&quot;:<br> The console port is the serial port on TDS7054 PPC board.<br> There was a first problem with the TDS7054: It wouldn't start because the NVRAM battery was dead.<br> I changed the NVRAM battery and used the console port to write to NVRAM the data lost due to the dead battery.<br> But since I m not sure of the data I wrote in the NVRAM, I was wondering if bad data could prevent the saving of the offset corrections made by SPC test.<br> <br> Vincent

<p>Hi Vincent,</p> <p></p> <p>I was not aware of any user accessible user port to access NVRAM, where did you find out about this?</p> <p></p> <p>I don't think the problem is with NVRAM, instead I think it's more likely a problem with your hard drive or software. I would suggest doing an OS restore as a first step.</p>

Hi Afonso,<br> <br> I will try to restore thanks<br> <br> BR<br> <br> Vincent