Entering a value using this command disables the auto-coupling (CALibrate:IQ:OAVoidance:FADing:AUTO) and sets the manual override value to the specified value.
These commands control power calibration execution.
:CALibrate:IQ:DC
This command calibrates the analog I/Q outputs of all I/O boards after a configuration is loaded. It performs a short adjustment that is not traceable to a standard. However, it will minimize errors associated with IQ gain, quadrature, and offset voltages.
The I/Q DC adjustment is dependent upon a number of instrument settings. If any of the instrument settings change, the adjustment may become invalid until it is performed again. The dependent instrument settings are:
I/Q attenuation level
Baseband generator settings
I/Q polarity settings
Baseband filter settings
I/Q calibration (the I/Q DC calibration will be invalidated if any other I/Q calibration is executed or if the Revert to Factory Default key is pressed)
I/Q Off On set to On
I/Q Source (must be set to Internal).
:CALibrate:IQ:DEFault
This command will restore the original factory calibration data for the internal I/Q modulator.
:CALibrate:IQ:OAVoidance:FADing <value>
:CALibrate:IQ:OAVoidance:FADing?
This command gets or sets the overflow avoidance (in dB) for the Fading feature. When the auto-coupling is enabled, the value returned by the query is provided by the Fading feature’s overflow avoidance algorithm based on the Fading settings. When the auto-coupling is disabled, the value returned by the query is the manual override value.
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Entering a value using this command disables the auto-coupling ( |
Range: 0.00 to 84.00 dB
:CALibrate:IQ:OAVoidance:FADing:AUTO ON|OFF|1|0
:CALibrate:IQ:OAVoidance:FADing:AUTO?
This command sets the state of auto-coupling for overflow avoidance. It is enabled (ON) by default, because in most cases, auto-coupling is desired to prevent overflows. In some low-SNR cases, automatic overflow prevention leads to output signals that are unusably low. This command, along with CALibrate:IQ:OAVoidance:FADing, provide the ability to manually adjust the overflow avoidance value in low-SNR cases.
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ON |
This choice enables auto-coupling for overflow avoidance. |
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OFF |
This choice disables auto-coupling. When disabled, use
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:CALibrate:POWer:AUTOmatic ON|OFF|1|0
:CALibrate:POWer:AUTOmatic?
This commands sets the state of the power calibration to be controlled automatically (ON) or manually (OFF).
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ON |
With this choice, a power calibration is automatically executed each time that a waveform is played. |
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OFF |
With this choice, a power calibration is not executed automatically when the waveform is played but can be manually initiated using the :CAL:POW ON command. |
:CALibrate:POWer[:STATE]ON|OFF|1|0
:CALibrate:POWer[:STATE]?
This command performs a power calibration. A power calibration is recommended any time you perform an action that changes the RMS value of the output signal, for instance, turning AWGN on or off, turning Fading on or off, changing waveforms, or when playing a bursted waveform. Power calibration is also essential for accurate signal-to-noise ratio (SNR) when additive white Gaussian noise (AWGN) is enabled. It provides accurate RF power leveling on a connected device when the automatic leveling control (ALC) is set to open-loop conditions.
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ON |
This choice initiates an immediate power calibration. |
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OFF |
Power calibration is not activated. |
:CALibrate:POWer:TIMeout <val>
:CALibrate:POWer:TIMeout?
This command sets the duration of the power calibration to time out after a number of seconds. When the power calibration is set to automatic, a power calibration is performed each time a waveform is played and may take too long for complex configurations and very large waveforms. Setting a time out value limits the duration to an acceptable length of time for the power meter to obtain a valid reading.
The variable <val> is expressed in terms of seconds.
Range: 0 to the number of seconds in 10 days