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You can use either one or two cables to execute the calibration. As for using one
cable, simply joint the two ends of the cable to the two ports respectively (Chart
3-1A). As for using two, firstly use a thru-connector with a known electric length to
connect the two cables, and next joint the rest of the two ends respectively to the
two ports (Chart3-1B). There you can calibrate the instrument on your own.
If there are many cables which are connected in series in different places in one
system, user shall better connect all of them together in series then do the
calibration.
When testing power amplifier, the power amplifier's output should connect in
series with an attenuator to avoid excessive RF power that will damage the
instrument. If the amplifier is a small -signal amplifier, connect the attenuator to its
input port otherwise the drive signal being too strong; moreover before
implementation, all the attenuators and cables should be connected in series to do
the calibration.
To start the user calibration, choose "Re CAL" in the function menu and then
follow the guilds.
Set the parameters of the calibration kit (or other adaptors whose electric
lengths are known) in the FUNC menu. Pre-setting the calibration kit's electric length
enables the instrument to compensate calibration kit's phase shift automatically. For
the testing system where there are several cables and adapters, in the FUNC menu,
the thru adaptor's electric length should be set as the sum of the adapters' electric
lengths which will later be removed from the actual test.
To change the frequency after the calibration, the instrument will select system
calibration automatically.
Chart 3-1B: Connect two cables in calibration
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