56 Keysight N9923-90001 User’s GuideNA (Network Analyzer) ModeNA Mode SettingsWhile setting Port Extension, the physical length of the extension, at thecurrent Velocity Factor setting, is visible to the right (red box in aboveimage).Velocity FactorThe electrical delay or port extension value is entered as delay, or electricallength, in units of time.Entering the velocity factor causes the FieldFox to accurately display theequivalent physical length in meters (NOT available in feet) that correspondsto the entered electrical delay.Velocity factor is the ratio of the velocity of wave propagation in a coaxial cableto the velocity of wave propagation in free space. This velocity depends on therelative permittivity of the cable dielectric (er).Velocity factor = 1/sqrt(er)VF = 0.66 corresponds to wave propagation through a polyethylene dielectric.VF = 1.0 (default setting) corresponds to wave propagation through free space(a vacuum).How to set Velocity Factor— Press Meas Setup 4.— Then Port Extensions— Then Velocity Factor— Then enter a value between 0.1 and 1 using the numeric keypad, then pressEnter.You can also set Velocity Factor by pressing Meas Setup 4 then Calibration(settings).Big Marker Display States (A and B)This feature, available ONLY in NA Mode, allows you to view up to three Big orSuper Big marker readouts. This is done by using up to two different displaystates called A and B. Each display state is comprised of the settings listedbelow. When the Big Readout setting is toggled through A and B, these displaystates are recalled.How to create Big Marker Display StatesTo have big readouts, markers MUST be created using the following procedure.If you have already set up yo ur display and do not want to lose it, then save thecurrent state to a state file. Learn how in “State Files” on page 195. Thefollowing procedure will overwrite your display state.— Press Mkr ->/ Tools
