4155B / 4156B Semiconductor Parameter Analyzer敘述As a courtesy to customers, on this page you can find PDF versions of some of the technical literature for these products. The 4155B and 4156B were discontinued on December 1, 2000 and are under support through January 31, 2006. The 4155C Semiconductor Parameter Analyzer replaces the 4155B, and the 4156C Precision Semiconductor Parameter Analyzer replaces the 4156B. Please refer to the web pages for these products for more information.Note: Discontinued means that the product is no longer sold, while obsolete means that the product is no longer supported. Keysight Technologies normally supports products for a minimum of 5 years after discontinuance.