Other topics about Communication with External Devices
The following figure provides an overview of the E4990A's internal data processing flow.
E4990A's data processing flow
A user correction coefficient data array contains the actual impedance array of Open/Short/Load standard for the user calibration. Each data element is stored as a complex number (Re/Im).
To read/write one of the formatted data arrays, use the following command:
A user correction coefficient data array contains the actual impedance array of Open/Short/Load standard for the fixture compensation. Each data element is stored as a complex number (Re/Im).
To read/write one of the formatted data arrays, use the following command:
A corrected data array contains the corrected data obtained by performing adapter setup, averaging, user correction, port extension and fixture compensation operations on the raw measured data for each trace of each channel. Each data element is stored as a complex number (Re/Im).
The instrument retains one formatted data arrays for each channel. The total is four data arrays for four channels. To read/write one of the formatted data arrays, use the following command:
When the :CALC:MATH:MEM command is executed on a particular corrected data array, its copy is stored into the corrected memory array corresponding to that corrected data array.
The instrument retains one corrected memory arrays for each channel. The total is four data arrays for four channels. To read/write one of the corrected data arrays, use the following command:
A formatted data array contains the formatted data (values to be displayed) obtained by performing data math and equation operations, formatting and reference tracking on a particular corrected data array. Regardless of the data format, it contains one or two data elements per measurement points depending on the selected parameters.
The instrument retains 16 formatted data arrays at maximum, each of which is associated with one of the 4 traces contained in one of the 4 channels (4 × 4 = 16). To read/write one of the formatted data arrays, use the following command:
A formatted memory array contains the formatted data (values to be displayed) obtained by performing data math operations, measurement parameter conversion, and smoothing on a particular corrected memory array.
The instrument retains 16 formatted memory arrays at maximum, each of which is associated with one of the 4 traces contained in one of the 4 channels (4 × 4 = 16). To read/write one of the formatted memory arrays, use the following command:
A stimulus data array contains the stimulus values for all measurement points.
The instrument retains 4 stimulus data arrays at maximum, each of which is associated with one of the 4 channels. Stimulus data arrays are read-only. To retrieve one of the stimulus data arrays, use the following command: