Agilent Technologies X Series Manual page 477

Input/Output
I/Q Probe Calibration
The I/Q probe calibration creates correction data for one of the front panel I/Q channels. When the probe
has EEPROM identification, the data is unique to that specific probe. When the probe does not have
EEPROM identification, the data will be used for all probes of the same type. The data is also unique to
the channel, so calibration data for the I channel will not be used for the Q channel and vice versa.
The guided calibration (front panel only) will show connection diagrams and guide the user through the
I/Q Isolation Calibration and through calibrating each port. The calibration data for each port is stored
separately, so as soon as a port is calibrated that data is saved and will be used. If a user presses "Exit" to
exit the calibration process, the data for the port already completed will still be used. It is recommended
that a calibration be completed once started, or if exited, that it be properly done before the next use of
the probe. The "Next" button will perform the calibration for the current port and then proceed to the
next step in the calibration procedure. The "Back" button will return to the prior port in the procedure.
Both softkeys and dialog buttons are supplied for ease of use. The dialog buttons are for mouse use and
the softkeys for front panel use.
The calibration can also be done via SCPI, but no connection diagrams will be shown. The user will have
to make the correct connections before issuing each port calibration command. Again, it is recommended
that all ports be calibrated at the same time.
For Active probes or when Differential is Off, only the main port is calibrated, otherwise both the main
and complementary ports are calibrated.
The instrument state remains as it was prior to entering the calibration procedure except while a port is
actually being calibrated. Once a port is calibrated it returns to the prior state. A port calibration is in
process only from the time the "Next" button is pressed until the next screen is shown. For SCPI, this
corresponds to the time from issuing the CAL:IQ:PROB:I|IB|Q|QB command until the operation is
complete.
For example, if the prior instrument state is Cal Out = Off, Input = I+jQ, and Differential = Off, then up
until the time the "Next" button is pressed the I Input and Q Input LEDs are on and the Cal Out, I-bar
Input and Q-bar Input LEDs are off. Once the "Next" button is pressed for the I port calibration, only the
Cal Out and I Input LEDs will be on and the others will be off. When the screen progresses to the next
step ("Next" button again enabled), the prior state is restored and only the I Input and Q Input LEDs are
on (Cal Out is off again).
The last calibration date and time for each relevant port will be displayed. For passive probes with
Differential On, any calibration that is more than a day older than the most recent calibration will be
displayed with the color amber.
I Port
The I port calibration is performed with the probe body attached to the front panel's I port and the probe
tip connected via an adapter to the Cal Out port. The guided calibration will show a diagram of the
required connections.
Show Adapter
Show a connection diagram and instructions for the probe and adapter. See "Show Adapter Screen" on page 482.
Key Path
Input/Output, I/Q, I Setup, I Probe, Calibrate
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