Keysight N9923A FieldFox User Manual page 79

CAUTION
How to Connect the Power Sensor
Connect your Power Sensor to one of the USB ports.
NOTE Use an attenuator between the DUT and the power sensor when measuring power
levels that are higher than +20 dBm. The attenuator value can be subtracted from
the measurement using the Offset feature, discussed on page 81.
A sequence of status lights are displayed on the base of the power sensor.
 Green blinking light indicates the power sensor is communicating or self-tests are
 Amber light indicates Zeroing is being performed.
 Red light indicates an error has occurred with the power sensor. Refer to power
 No light indicates the FieldFox is not communicating with the power sensor. This is
Power Meter Settings
Select Power Meter Mode before making any setting in this section.
How to select Power Meter Mode
 Press Mode_.
 Then
Average / Peak
 Press Measure 1
 Then choose from the following:
Zeroing
The Keysight USB Power Sensors perform Internal Zeroing automatically. Because
Keysight USB Power Sensors have an internal switch, Internal Zeroing does NOT
require that the power source be turned OFF.
For highest measurement accuracy, when measuring power levels below –30 dBm,
External Zeroing should be performed.
During External Zeroing, the power source MUST be turned OFF or the power sensor
disconnected from the power source (device under test). Power is OFF when power
sensor measurements are below –60 dBm. When power higher than this is detected
at the sensor, a warning message is shown on the FieldFox and External Zeroing will
not proceed.
NOTE External Zeroing is NOT allowed on the U2020 X-series Power Sensors.
Power Meter Mode
Please refer to your USB Power Sensor User's Guide and observe the damage
levels of your device.
being performed. Because the FieldFox is usually communicating with the power
sensor when it is connected, this is the normal mode of operation.
sensor documentation.
the case when in Hold mode or when NOT in Power Meter Mode.
Power Meter.
Measures and reports the average of the power measurements.
Average
o
Available ONLY on the U202x power sensors. Measures and reports peak
Peak
o
power detected at sensor input.
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