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TSP #19 - Teardown, Repair and Calibration of a Keithley 220 Programmable Current Source 11 лет назад


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TSP #19 - Teardown, Repair and Calibration of a Keithley 220 Programmable Current Source

In this episode Shahriar investigates the cause of failure of a Keithley 220 Programmable Current Source. Despite being manufactured in the mid-1980's, the Keithley 220 is still a very popular programmable current source. Alongside the repair efforts, the schematic of various analog, digital and power supply boards are also presented. By interpreting the failure mechanism, the fault is traced and corrected. The Keithley 220 is then calibrated and the calibration procedure of the sub-100nA range is explained. Finally, the performance of the calibrated unit is verified using a Rigol DM3068 Multimeter. The Signal Path http://www.TheSignalPath.com

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