Guarding with a Picoammeter for Better Measurements

What is guarding? How can I use guarding for my measurements? How does current leakage affect low current/high resistance measurements? This video answers these questions by demonstrating how guarding with a picoammeter works and how it can improve your measurement quality. Measuring a high value resistor in a test fixture using a Keithley 6487 Picoammeter/Voltage Source, we can see how guarding impacts the measured resistance of a device under test. Guarding can be useful for anyone measuring high value resistances of components, insulators, PCBs, multi-pin connectors, and more. For more information on improving your low level measurements, check out the Keithley Low Level Measurements Handbook: https://www.tek.com/document/handbook... Keithley Series 6400 Picoammeters: https://www.tek.com/keithley-low-leve...