Teardown and calibration checking of a Keithley 480 Picoammeter Dave got from ebay.
This was supposed to be a repair and troubleshooting as well, but Murphy had other ideas.

Keithley 480 User & Service Manual: http://www.ko4bb.com/Manuals/09)_Misc_Test_Equipment/Keithley/Keithley_Model_480_Picoammeter_Complete.pdf

Forum Topic: http://www.eevblog.com/forum/blog/eevblog-406-keithley-480-picoammeter-teardown-calibration/

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