Hi folks, in a moment of weakness I picked up a (presumably broken) Datron 4000 Autocal Standard. It's a pretty neat device, the 4000A has a higher spec voltage reference and is claimed to be "suitable for 8.5 digit cal". Spec sheet: http://www.teknetelectronics.com/DataSheet/DATRON/DATRO_4000a114617.pdf Now of course Datron is gone, first to Wavetek, then Fluke? but I wonder if anyone has any experience with the Datron 4000 or an electronic copy of the user and/or service manual. Also, does anyone know about the gas discharge displays in Datron gear of that era? I'm afraid mine are gonna be broken. Thanks much, Andy Bardagjy bardagjy.com