Hi I believe you will find that when you do the cal it will ask you:
Security yes/no? (answer yes) Enter your key? (enter a random number) Enter your key again? (re-enter random number) Security enabled. No, that is not a direct quote of what happens. It’s purely a guess based on the process used on other gizmos. Yes, there pretty much *has* to be a “wipe the memory” command somewhere. I would not find it surprising if the answer involves a trip back to HP for service. I doubt they will do much on a 53131 now that they have killed off support. What to do: 1) Try the usual guesses 123, 1234 etc. 2) Try the end of the serial number on the counter 3) Try 53131 Again - only a guess. It does fit the given information - no magic code listed anywhere / Magic code does exist. Bob > On Dec 23, 2014, at 8:34 PM, Tom Van Baak <[email protected]> wrote: > > Ulli, > > You're right. The actual procedure is not described in the manual(s): > > Operating Guide > http://cp.literature.agilent.com/litweb/pdf/53131-90055.pdf > > Programming Guide > http://cp.literature.agilent.com/litweb/pdf/53131-90044.pdf > > Assembly-Level Service Guide > http://cp.literature.agilent.com/litweb/pdf/53131-90039.pdf > > Component Level Information > http://literature.cdn.keysight.com/litweb/pdf/5989-6308EN.pdf > > But I have three ides for you. > > 1) The last PDF shows U14 is AT28C64B (www.atmel.com/Images/doc0001h.pdf) so > if all else fails, you can use a logic analyzer on the address(13) / data(8) > pins and see what's in the EEPROM. With some experimentation by you or others > on the list we can locate the calibration security. This has the advantage of > getting the existing code, without having to clear the entire EEPROM. Some > other HP bench instruments use an onboard jumper to override the cal lock, > but I don't see that on a 53131A. So perhaps there is a magic front panel > sequence or SCPI command to clear NVRAM. > > 2) Search for 53132 at http://www.ko4bb.com/manuals/index.php and grab the 4 > EPROM's. Do a 16-bit merge of U8/U10 and U9/U11 and look for ascii strings. > All the SCPI words are in there and not all are documented. For example near > the words SYST and CODE and SEC[URITY] is ALL and DEL[ETE]. Probably safe to > try. Lots of interesting output strings, both for GPIB and for internal > debugging. Even the words EEPROM CLEAR, along with "Oooh! That tickles. I > don't know that vector." which we also see in the Z3801A, etc. > > There's also a hidden "SERVICE MENU", complete with Easter egg: > MLB TEAM KRISTI BITTNER, LEE COSART, ERIC INGMAN, GARY JACOBSEN, SOOK-LAN > LOH, ROB MITCHELL, ROBIN POSKUS, DON SCHREMP, DANA STOFFERS, AND GEORGE TSAI > SOFTWARE L. COSART G. JACOBSEN S. LOH R. POSKUS D. STOFFERS > HARDWARE K. BITTNER E. INGMAN D. SCHREMP > MECHANICAL G. TSAI > PROJECT MGR R. MITCHELL > BASEHIT -- 53132 > > 3) There's a pForth interpreter in this instrument too. Note pr_eeprom_debug > and wr_eeprom. > > That's enough hints to keep someone on the list (Magnus?) busy over > Christmas. Of course, if anyone knows the "confidential procedure", they > should just let us know... > > Thanks, > /tvb > > ----- Original Message ----- > From: "Mod Mix" <[email protected]> > To: <[email protected]> > Sent: Tuesday, December 23, 2014 3:04 PM > Subject: [time-nuts] HP 53131A - reset security code > > >> Hi, >> >> I got a used HP 53131A to which I added a stability option board (ocxo). >> In order to calibrate the device, a security code is needed - I don't >> know it. The seller doesn't know it. It's not the facorty set code. >> Advice on how the reset the non-volatile memory would be much appreciated. >> >> Thank you very much & happy Christmas >> >> Ulli >> >> From the 53131A service guide: >> A calibration security code feature allows you to enter a security code >> (electronic key) to prevent accidental or unauthorized calibrations of >> the Counter. The security code is set to 53131 or 53132 (corresponding >> to the model) when the Counter is shipped from the factory. >> If you forget your security code, you can reset the security code to the >> model-number default by resetting all of the non-volatile memory to a >> default state (Contact Agilent Technologies for this confidential >> procedure). >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
