What is the Exponential Average for Measuring Period "EAMP"?

Please see APPENDIX 6 and APPENDIX 7 for details; for longer update periods (250msec and longer); the meter uses a type of averaging, EAMP - and using this method, the measurement period is not affected by the input signal period or the synchronization source setting.

The measurement period is set equal to the data update interval.

The measured values are determined by computing the average of all the sampled data in the data update interval through digital fltering. This computing method is called Exponential Average for Measuring Period (EAMP).

In this method, the measurement period is not affected by the input signal period or the synchronization source setting.

Therefore, the input signal period does not have to be detected. In addition, the measurement period always matches between all input elements.

It is recommended that this method be used when it is diffcult to match the measurement period between the input and output signals such as in the aforementioned example of “(3) Power Transformer with Single-Phase AC Input and Three-Phase AC Output.” In principle, this method is superior in obtaining highly stable measured values, because factors such as errors in period detection do not exist.