ModAcc power measurement computes power of the various fields in the PPDU and over custom gates. The number of custom gates is specified by configuring the Number of Custom Gates property and the custom gates interval is specified by configuring the Custom Gate Start Time (s) and Custom Gate Stop Time (s) properties. The following figure illustrates start time and stop time for custom gates.

Power measurements for preamble and header are computed for the individual fields present in them. The following figure illustrates the other different portions of the WLAN packet and the corresponding power measurements supported.