The 16380A is a standard capacitor set consisting of four precision capacitors -1 pF (16381A), 10 pF (16382A) 100 pF (16383A), 1000 pF (16384A). These capacitors are primarily used for performance tests of Keysight’s 4-Terminal Pair LCR meters and impedance analyzers. Refer to the instrument’s operation/service manual for the method of using these standards.