By Zennaro M.
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Disconnect the dummy load from the reflected signal coupling port of the directional coupler. 12) Connect the power sensor to the reflected signal coupling port of the directional coupler. Connect the 50 Ω dummy load to the direct signal coupling port of the directional coupler. € 52 9 13) Enable the output of the signal generator, and measure the power with the power meter. 14) Being very low the expected value of the power of the reflected signal, due to the fact that the line is properly matched, modify gradually the setting of the power meter to reach the maximum sensitivity.
Exit from the calibration mode of the power meter. 3) Set the variable attenuator to an attenuation of -20 dB. 4) Check again the output level of the generator (it should be 0 dBm or 1mW) and the attenuation of the variable attenuator (-20 dB). Estimate the losses of the cables at the working frequency and compute the expected power level at the input of the power meter. PowerExpected(dBm)=PowerGenerated (dBm)+LossesCable(dB) +LossesConnector(dB)+Attenuation(dB) In our case the expected value cannot exceed -20 dBm.
You can therefore use this procedure to estimate roughly the losses of the cables and connectors, but you cannot expect to get the exact value. 9) Disable the output of the signal generator, if possible, or reduce the power at the minimum level, then switch the generator off. Disconnect the RF cable from the Spectrum Analyzer and switch it off. Experiment 4: Measurement of Cable Loss with Power Meter. Objective: We want to use the same procedure as experiment number 2 to measure the loss of a cable at a given frequency.
Radio laboratory handbook by Zennaro M.