Hi, I wonder if people can help with a question about a HP3458A.
The unit is an old one, the serial number is 00227, the firmware EPROMS were version 4, and the NVRAM chips have datecode 88 (that makes them 34 years old, amazing they are still going!). The unit is quite clean inside, although it had been dropped on the front panel as the terminal post fixing has broken, as have some of the lugs that hold the PCB to the front panel. It appears to have last been for cal in 2012 as it's got an Agilent electrical safety check sticker of that date. It reads within 10-20uV of another (Keysight Calibrated) 3458A on the 10V range. So far, I've ordered a replacement front panel from Keysight, reflashed the EPROMs to rev 8, and have read the NVRAMs and ordered replacements and sockets. It's also on day 3 of a CAL72 drift test to see how stable it is (according to the rear panel it has the Opt002 reference). However, this morning I noticed an error after an ACAL, "ERR 204 HARDWARE FAILURE - FLATNESS DAC CONVERGENCE 195". I gather this is an issue in the A2 board, any clues of what to look for? Thanks! _______________________________________________ volt-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
