This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett- Packard's former test and measurement, semiconductor products an d chemical analysis businesses are now part of Agilent Technologies. We have made no changes to this manual copy. The HP XXXX referred to in this document is now the Agilent XXXX. For example, model number HP8648A is now model number Agilent 8648A.