EEVblog #406 - Keithley 480 Picoammeter Teardown & Calibration

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/ EEVblog Main Web Site: http://www.eevblog.com EEVblog Amazon Store: http://astore.amazon.com/eevblogstore-20 Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/