We're trying to certify a product we've had for years in Taiwan, but the data collected is too old, so we need to re-do the data collected for the submission. Unfortuately, there have been some changes in the test procedure which the lab tells us we now fail a test.
when I was doing band edge measurements, the lower duty cycle of some of the higher data rates (36 Mbps, 54 Mbps, and MCS7) causes a band edge failure for the RMS average points. One of the new testing requirements since the original FCC report four years ago is that any test signals which have a duty cycle lower than 98% must have an upwards duty cycle correction factor applied, using the formula DCCF = 10 * log (1/DC), where the duty cycle is in decimal format. This is a requirement in ANSI C63.10:2013 and while it is not explicitly called out in the methods for LP0002:2018, it does have the following catch-all clause:
“The characteristic of low-power radio-frequency devices shall be test in accordance with this
regulation; those not stipulated shall be tested per CNS standards. If in-country standards are not
found, they shall be tested based on IEEE, ANSI,ETSI EN standards and FCC 47 CFR PART
2,KDB,ARIB STD-T67 associated test requirements.”
Based on this clause, we believe the duty cycle correction factor applies to this testing. Let us know if there is a way to increase the operating duty cycle (which lowers the correction amount needed and results in higher accuracy) or if there is another way to resolve this.
Does someone know how to increase the operating duty cycle of the continuous waveform testing?
adam
