There are two sampling techniques:
• series (sequential) sampling with interpolation, and
• parallel sampling with holding network [79, Chapter 2].
Series Sampling with Interpolation
The derating measurements as described in Section 2.8 are based on sequential sampling utilizing the soft- and hardware specified by the UCDAS-16G Manual of the Keithley Corporation [80, Chapter 2]. The software program is written in Quick BASIC language. Sampling programs for two and five channels have been used [81, Chapter 2]. Some of the frequently asked questions concerning sequential sampling are addressed as follows.