 Hello, welcome to this short video with topic measurement of the STN32WB output return loss on Vector Network Analyzer. We assume that the VNA is calibrated, if not, calibrate first. Then connect the measuring cable to DUT and tighten with a torque range. Now we set the markers for reading impedance values for wanted frequencies. We set the markers to outer frequencies of the Bluetooth band and in the middle. Press the marker button, select markers and press mark 1. Set the frequency point to 2.4 GHz, set the marker to 2.45 GHz and marker 3 to 2.5 GHz. Thus we will see an impedance variation over the band. This displayed plot doesn't correspond to the operating state. For the first, it is necessary to turn on the output power. In this state, the output impedance should be measured because it varies in the presence of the high frequency output power. A return loss is usually measured at the maximum power level, but you can select one what is your interest. Now we can switch the tone power on. Open the SDN32CubeMonitorRF and press the BLE operation. From roll down menu, click on the appropriate comport, click on connect and choose RF test bookmark. In dialog menu for transmitter, click on PA level and set the requested output power. We choose the maximum, the most used state. Then we set the frequency. We will use the middle of the band, so channel 19. Other parameters have no meaning at this moment due to tone mode usage. Then click start tone to activate the output power. We can observe the output reflection change. The peak represents the output power and we can neglect it. It could be suppressed by setting of number of points. The important thing is that hardware is put into operation. It is possible to read out output impedances in individual frequency points from the Smith chart. Thanks for watching, bye.