  This paper reports on an evaluation of the Fluke 8588A digital multimeter
(DMM) sampling performance and comparison to Keysight 3458A DMM sampling
performance. The design of 8588A type DMM shows both similarities and striking
differences in design compared to 3458A type DMM. Apart from their specified
sampling capabilities, measurements were performed to evaluate frequency
response, noise performance, including a 1 / f type noise and a timing jitter
induced noise, as well as phase measurement performance. The given
comprehensive report is crucial for careful application of DMMs in metrology
tasks with optimal utilization of their performance.
