Keysight Technologies N9330B User Manual

Contents

Keysight Technologies N9330B User Manual Manual pdf 40 page image

Making MeasurementsMaking an Average Power Measurement34Making an Average Power MeasurementAverage power measurements provide a key metric intransmitter performance.Base station transmit power must be set accurately toachieve optimal coverage in wireless networks. If thetransmit power is set too high due to inaccurate powermeasurements, undesired interference can occur. If thetransmit power is set too low, coverage gaps or holesmay occur. Either case may affect system capacity andmay translate into decreased revenue for serviceproviders.Average power can be measured for the channel ofinterest while the base station is active. All otherchannels should be inactive. Average power is abroadband measurement. If other signals are present theanalyzer will also measure their power contributions.The analyzer supports the U2000 Series USB powersensors.The U2000 Series USB power sensors do not needmanual calibration and zero routines performed.Calibration and zeroing are performed without removingthe power sensor from the source, through internalzeroing. With internal zeroing of U2000 Series USBpower sensors, there is no need to disconnect thesensor or power-off the DUT. The U2000 Series do notrequire 50 MHz reference signal calibration, allowing thefactory calibration to ensure measurement accuracy. Forbest accuracy, users are recommended to performCAU -CAU TI O N The maximum power for the RF IN port and the RF OUT portof the analyzer is +20 dBm. The maximum power for thePower Sensor port is +24 dBm. When directly coupled to abase station, the test set can be damaged by excessive powerapplied to any of these three ports.To prevent damage in most situations when directly couplingan analyzer to a base station, use a high power attenuatorbetween the analyzer and the BTS.