This seems to be a very difficult item to locate or get any information on, yet Keithley calls it out as a standard for calibrating many of thier picoammeters, electrometers, femptoamp meters etc. There's a good chance I might have a solution for this, but still trying to find out more on this unit. Particularly what this unit and it's accessories sold for historically. :wink:
http://www.jswilley.com/files/37050588.pdf
looks like that is from your website?
Have you tried contacting Keithley?
Yes and they've been quite helpful after a few attempts. Thanks.