Keysight N9938-90003 User’s Guide 45
CAT (Cable and Antenna Test) Mode
CAT Mode Settings
Output Power
Set the power level out of the FieldFox to High, Low, or manually set power
level to a value between High and Low.
Generally, the high power setting is used when measuring passive, high-loss
devices to place the signal farther from the noise floor. Increasing the power
can also help reduce trace noise. However, for devices that are sensitive to
high power levels such as amplifiers, use the Low power setting.
For best measurement accuracy, use the Manual power setting at -15 dBm.
After calibration, the power level can be decreased for amplifiers, or increased
for higher dynamic range.
How to set Output Power
—Press Meas Setup 4.
—Then Power
—Then Output Power
— High Sets output power to the maximum achievable power at all
displayed frequencies. Output power is NOT FLAT across the
displayed FieldFox frequency span. Use the High power setting, when
better dynamic range and lower noise is desired. Please see
“Specifications/Data Sheet” on page 761 for expected power levels.
— Low Sets output power to approximately –50dBm, FLAT across the
displayed FieldFox frequency span.
— Man (Default setting) Sets the output power to –15 dBm, FLAT across
the displayed FieldFox frequency span. If flattened power can NOT be
achieved, a warning message and beep occurs. To achieve a
flattened output power, reduce the power level or stop frequency.
—Then press Power Level
— Then enter a value using the numeric keypad, the arrows, or the
rotary knob.
—Press Enter
.
Power Level settings in this mode will NOT change Power Level settings in
other modes. To help prevent damage to your DUT, use caution when
changing modes with your DUT connected to the FieldFox test ports.
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