Awww.  I am thinking that one of my NVRAMs gave up in my HP3458A. I had planned to change all of the soldered in NVRAMs out, but unfortunately I had forgotten about getting this job done.  My plan was to desolder and change out of all the NVRAMs off and install a new set into quality machined pin DIP sockets. I looked in my 3458A manuals and I cannot identify this specific error message.  I hope I did not lose my cal data. :/ Can somebody identify a "RAM TEST 1 LOW" error? My HP 3458A is a beauty and is serial # 2823A 04153

-------- In message <1355594832.29796.YahooMailNeo@web164002.mail.gq1.yahoo.com>, Lawren ce Sawicki writes: >Awww. I am thinking that one of my NVRAMs gave up in my HP3458A. At least it does not seem to be the CAL RAM Try leaving the meter powered on for some time, then power cycle it quickly. If that works, make a backup copy of your CALRAM immediately (See old message from me in mailling list archive for how to do this across the GPIB interface) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.