128 Keysig ht N9923-90001 User’s GuidePower Meter (USB) ModeUSB Power Meter SettingsUSB Power Meter SettingsSelect Power Meter Mode before making any setting in this section.How to select Power Meter Mode— Press Mode_.— Then Power Meter (USB Sensor).Average / Peak— Press Measure 1— Then choose from the following:— Average Measures and reports the average of the powermeasurements.— Peak Available ONLY on the U202x power sensors. Measures andreports peak power detected at sensor input.ZeroingThe Keysight USB Power Sensors perform Internal Zeroing automatically.Because Keysight USB Power Sensors have an internal switch, Internal Zeroingdoes NOT require that the power source be turned OFF.For highest measurement accuracy, when measuring power levels below –30dBm, External Zeroing should be performed.During External Zeroing, the power source MUST be turned OFF or the powersensor disconnected from the power source (device under test). Power is OFFwhen power sensor measurements are below –60 dBm. When power higherthan this is detected at the sensor, a warning message is shown on theFieldFox and External Zeroing will not proceed.How to perform External Zeroing— Press Cal 5.— Then External Zero.While either Internal or External Zeroing is being performed, “Zeroing...” isshown on the FieldFox screen. While this message is present, do NOT makeany changes to the FieldFox.External Zeroing is NOT allowed on the U2020 X-series Power Sensors.
