Keysight N9923-90001 User’s Guide 25Preparing for Initial Use of Your New FieldFoxAvoid Overpowering the FieldFox— The temperature at which the following events occur is the average of theRF1, RF2, SB1, SB2 temperatures. These temperatures come from internalsensors embedded within FieldFox.Temperature Control ModeAt approximately 75°C, the FieldFox enters Temperature Control mode byreducing display intensity, switching to Outdoor Sun display colors, andreducing measurement speed. This should decrease the internal temperaturewhich preserves measurement accuracy an d maintains the long-term reliabilityof the FieldFox. When this occurs, the following message is displayed on theFieldFox screen:The system is entering Temperature Control Mode due to high internaltemperature.When entering Temperature Control mode, save your instrument state anddata that you want to keep.When the temperature drops to approximately 73°C, a message is displayedindicating that the FieldFox is leaving Temperature Control Mode and normaloperating settings are restored.High-Temp Shut downIn extreme situations, Temperature Control mode may not stop an increase inthe FieldFox internal temperature. At approximately 78°C, High-TemperatureShut down will engage and turn OFF the FieldFox.Just prior to shut down, the FieldFox will display a warning of imminent shutdown.Avoid Overpowering the FieldFoxThe FieldFox can be damaged with too much power or voltage applied.Exceeding the maximum RF power levels shown below will cause an ADC OverRange message to appear on the screen.Measurement speed specifications do NOT apply in Temperature ControlMode.Maximum Input Voltages and Power:— RF IN/OUT Connectors: ±50 VDC, +23 dBm RF— DC Input: -19 to 19 VDC, 40 Watts maximum when charging batteryLearn more about Maximum power and voltages in the FieldFox DataSheet.
