Keysight Technologies N9321C, User Manual

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75
Functions and Measurements
Making a Power Measurement with USB Power Sensor
Making a Power Measurement with USB Power Sensor
The N932xC spectrum analyzer supports the U2000 and U2020
series USB power sensors.
The U2000 series USB power sensors do not need manual
calibration and zero routines performed. Calibration and zeroing
are performed without removing the power sensor from the source,
through internal zeroing. With internal zeroing of U2000 series USB
power sensors, there is no need to disconnect the sensor or
power-off the DUT. The U2000 series do not require 50 MHz
reference signal calibration, allowing the factory calibration to
ensure measurement accuracy. For best accuracy, users are
recommended to perform external zeroing for input signals below
-30 dBm for best accuracy.
CAUTION
The maximum power for the RF IN port and the RF OUT port of the
analyzer is +30 dBm (1 W). The maximum power for the U2000 Series
Power Sensor port is +25 dBm (316 mW). When directly coupled to a
base station, the test set can be damaged by excessive power applied to
any of these three ports.
To prevent damage in most situations when directly connect an analyzer
to a base station, use a high power attenuator between the analyzer and
the BTS.
NOTE
If you suspect other signals may be present, it is 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).