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: )_Misc_Test_Equipment/Keithley/ Forum Topic: EEVblog Main Web Site: EEVblog Amazon Store: Donations: Projects: Electronics Info Wiki: Теги: keithley,picoammeter,keithley 480,current source,keithley 225,keithley 261,calibration,low current,measurement,shielding,schematic,repair,ebay,calibration check,calibration adjustment,troubleshooting,electronics,electronics troubleshooting,electronics testing,performance testing