6 Input/Output
6.2 Input
Probe calibration data is stored for each probe type for each channel. When no
probe is sensed, the probe type "Unknown" is used, and this is also treated like a
probe type with its own calibration data. When a probe is changed, the calibration
data for that probe type for that port is restored. An advisory message will be
displayed showing the new probe type and the calibration status. The calibration
data is stored permanently (survives a power cycle) and is not affected by a Preset or
any of the Restore commands. When the probe has EEPROM identification (most
newer Keysight probes have this), the calibration data is stored by probe serial
number and port, so if you have two probes of the same type, the correct calibration
data will be used for each. For probes that do not have EEPROM identification, the
calibration data is stored by probe type and port and the instrument cannot
distinguish between different probes of the same type. In all cases (with or without
EEPROM identification), the calibration data is port specific, so it will not follow a
specific probe from port to port if the probe is moved.
The "Unknown" probe type is used whenever no probe is sensed. When no
calibration data exists for "Unknown" the latest cable calibration data is used.
Attenuation
The attenuation is part of the calibration data stored with the probe type and is
initially the value that was returned by the last calibration. You can modify this value
and any changes will be stored with the calibration data and will survive power
cycles and presets. When a probe calibration is performed the attenuation value will
be overwritten by the calibration.
Remote
Command
[:SENSe]:CORRection:IQ:I:ATTenuation:RATio <real>
[:SENSe]:CORRection:IQ:I:ATTenuation:RATio?
Example Set the attenuation for the current I probe to 100.00:1:
:CORR:IQ:I:ATT:RAT 100
Notes Each probe type has its own attenuation setting. As probes are changed the attenuation value will
reflect the new probe's setting. Changing the attenuation affects only the current probe type's setting
and leaves all others unchanged
When the IQ Path is I+jQ, the Q probe attenuation setting must match the I Probe attenuation setting
within 1 dB. If this is not the case, an error condition message is generated, 159; Settings Alert; I/Q
mismatch: Attenuation
Preset 1
State Saved Saved with probe calibration data. Survives a power cycle and is not affected by Preset or Restore
Min/Max 0.001/10000
This is an alternate form of the SCPI command that allows input as a power instead
of a ratio.
Remote
Command
[:SENSe]:CORRection:IQ:I:ATTenuation <rel_ampl>
[:SENSe]:CORRection:IQ:I:ATTenuation?
2382 Spectrum Analyzer Mode User's &Programmer's Reference
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