Keysight Technologies N9330B User Manual

Contents

Keysight Technologies N9330B User Manual Manual pdf 41 page image

Making MeasurementsMaking an Average Power Measurement35external zeroing for input signals below -30 dBm forbest accuracy.Making a Basic Average Power MeasurementTo make an average power measurement, connect thepower sensor and cable, zero and calibrate the meter,before making a measurement.Zeroing of the Power Meter will occur automatically:• Every time the Power Meter function is used.• When a 5 degree C. change in instrumenttemperature occurs.• Whenever the power sensor is changed.• Every 24 hours (min.).• Before measuring low level signals -for example,10 dB above the lowest specified power the powersensor is capable of.Calibrating the Power Meter every time you cycle thepower on and off.In most situations, you can press {Zero} to complete thetwo steps (zero and cal) together.NO TE If you suspect other signals may be present, it isrecommended that you turn off all the other channels andmeasure average power only on the signal of interest.Another option is to measure channel power (which is lessaccurate), that filters out all other channels (signals). You canmeasure channel power for CDMA using the CDMA Analyzeror CDMA Over Air tool. For other modulation formats, usetheir respective analyzers (that is, GSM, 1xEV-DO, orW-CDMA) or measure channel power using either thespectrum analyzer or the Channel Scanner tool.NO TE Connect the power meter as close as possible to the poweramplifier/duplexer output. Do not use a coupled port. Sensorsmay not be as accurate at the power levels provided bycoupled ports.