Keysight Technologies FieldFox A Series, Руководство пользователя

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104 Keysight N9927-90001 User’s Guide
NA (Network Analyzer) Mode
NA Mode Settings
— Low Sets output power to approximately –45 dBm, FLAT across the
displayed FieldFox frequency span.
— Man (default setting at -15 dBm) Set output power to an arbitrary
value, 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 .
System Impedance (Z0)
To accurately view data presented in Smith Chart format, first set the System
Impedance.
Learn how to select Smith Chart format in
“Format” on page 94 .
Learn how to make 75 Ω measurements at the FieldFox Supplemental Online
Help: http://na.support.keysight.com/fieldfox/help/SupHelp/FieldFox.htm
How to set System Impedance
— Press Meas Setup 4 .
— Then Settings .
— Then scroll to System Z0 and press Edit
— Then type either 50 or 75 and press Enter
Port Extensions
Port extensions allow you to electrically move the calibration reference plane
on either port 1 or port 2 after you have performed a calibration.
Why use Port Extensions
Use port extensions if you are unable to perform a calibration directly at your
device because the location is not accessible. Perform a calibration at a
convenient place, then use port extensions to compensate for the time delay
(phase shift) to the desired reference plane. On the FieldFox, port extensions
does not compensate for the loss of the additional electrical length, nor any
mismatch errors beyond the calibration reference plane.
Also use port extensions if you have already performed a calibration, and then
decide that you need to add a length of transmission line in the measurement
configuration. Use port extensions to “tell” the FieldFox that you have added
the length to a specific port.