I just acquired a datron / wavetek 1271 DMM, which seems to be in good working condition (I'm neither qualified nor do I have the necessary gear to determine, whether it is within specifications, but it seems to be fairly near at least, despite being some 25 years overdue on its regular calibration
There's a cal. sticker from '93 over one of the chassis screws, so I must assume replacement of the battery is some 20 years overdue as well.
The sensible thing would be to replace the battery and send it off to calibration, albeit I'd rather postpone this until I'm cash-flow positive again. The manual recommends exchanging the battery while the unit is powered on.
I'd like to preserve the NVRAM content with the calibration data as is, while exchanging the battery.
I was wondering, whether someone figured out how to read out (and latter write, if necessary) the NVRAM using GPIB?