Keysight Technologies N9340B User Manual page 70

Making Measurements
Making an Average Power Measurement
best accuracy, users are recommended to perform
external zeroing for input signals below -30 dBm for
best accuracy.
If you suspect other signals may be present, it is
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recommended that you turn off all the other channels and
measure average power only on the signal of interest.
Another option is to measure channel power (which is less
accurate), that filters out all other channels (signals). You can
measure channel power for CDMA using the CDMA Analyzer
or CDMA Over Air tool. For other modulation formats, use
their respective analyzers (that is, GSM, 1xEV-DO, or
W-CDMA) or measure channel power using either the
spectrum analyzer or the Channel Scanner tool.
Connect the power meter as close as possible to the power
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amplifier/duplexer output. Do not use a coupled port. Sensors
may not be as accurate at the power levels provided by
coupled ports.
Making a Basic Average Power Measurement
To make an average power measurement, connect the
power 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 instrument
temperature 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 power
sensor is capable of.
Calibrating the Power Meter every time you cycle the
power on and off.
In most situations, you can press {Zero} to complete the
two steps (zero and cal) together.
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