6 Input/Output
6.2 Input
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
you 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. You will need 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).
I/Q Isolation Calibration
I/Q Isolation Calibration must be run before calibrating any port with either the I/Q
Cable Calibration or I/Q Probe Calibration. This calibration is performed with
nothing connected to any of the front panel I/Q ports. This is the first step in both
the I/Q Cable Calibration and the I/Q Probe Calibration. This dialog appears if the
Calibration is being run for the first time. It can also be accessed by pressing Back
Short Range Comms & IoT Mode User's &Programmer's Reference 2080
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