Keysight 3458A Internal Clock Performance

This paper describes a detection and measurement of 100 ns sample clock time jumps that can be observed for the Keysight 3458A digital multimeter when sampling with an internal sampling clock. In most cases such time jumps do not affect the measurement results. However, to achieve the highest accuracy in sampled measurements this might be an important parameter. The results on two DMMs over a two year period are presented, indicating a possible occurrence of time jumps and their mitigation.