ETSI EN300328 替代法 ERP&EIRP测试研究
欧洲CE认证中，ETSI EN300328替代法ERP & EIRP测试研究RE: ETSI EN300328 替代法 ERP&EIRP测试研究 - FCC KDB 412172
GUIDELINES FOR DETERMINING THE EFFECTIVE RADIATED POWER (ERP) AND EQUIVALENT ISOTROPICALLY RADIATED POWER (EIRP) OF AND RF TRANSMITTING SYSTEM1、DUT功率在传导场地测试（DUT power measured in a conducted test configuration）
DUT 功率是由发射器天线端口和测试仪器之间通过一条直量同轴线直接连接起来测试的。天线增益是已知的，那么ERP /EIRP 可以直接引用公式（3）和(4), (5)，或者（6）公式里定义的关系。
ERP or EIRP = PT + GT – LC (3)
GT(dBd) = GT(dBi) - 2.15 dB. (4)
ERP = EIRP – 2.15 dB. (5)
EIRP = ERP + 2.15 dB. (6)
ERP or EIRP = effective radiated power or equivalent isotropically radiated power (expressed in the same units as PT, typically dBW, dBm, or power spectral density (PSD)), relative to either a dipole antenna (ERP) or an isotropic antenna (EIRP);
PT = transmitter output power, expressed in dBW, dBm, or PSD;
GT = gain of the transmitting antenna, in dBd (ERP) or dBi (EIRP);
LC = signal attenuation in the connecting cable between the transmitter and antenna, in dB
2、辐射测试场地（没有用到信号信号或天线替代技术）测试DUT功率直接计算方法（Direct calculation from the DUT power measured in a radiated test configuration (i.e.,signal/antenna substitution techniques not used).)
如果DUT功率是在辐射场地测试（没有用到信号信号或天线替代技术）的，那么EIRP在数字上接近用以下公式计算出来的值。
EIRP = PR + LP. (7)
PR = PMeas – GR + LC + LAtten - GAmp (8)
PMeasured = measured power level, in dBW, dBm or psd;
GR = gain of the receive (measurement) antenna, in dBi;
LC = signal loss in the measurement cable, in dB;
LAtten = value of external attenuation (if used), in dB;
LP = 20 Log F + 20 Log D – 27.5(9)
LP = basic free space propagation path loss, in dB;
F = center frequency of radiated DUT signal, in MHz;
D = measurement distance, in meters
EIRP = equivalent (or effective) isotropically radiated power (in same units as PR);
PR = adjusted received power level, in dBW, dBm, or PSD;
LP = basic free space propagation path loss, in dB.
3、如果DUT功率是用信号或天线替代技术来测试的，那么ERP/EIRP可以从在信号或者天线替代测试配置使用到的信号发生器的功率设定来决定。
ERP or EIRP = PSigGen + GT - LC (10)
where:
PSigGen = power setting of the signal generator that produces the same received power
reading as the DUT, in dBm, dBW or psd;
GT = gain of the substitute antenna, in dBd (ERP) or dBi (EIRP);
LC = signal loss in the cable connecting the signal generator to the substitute antenna, in dB.
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