Corrected Data Array; Corrected Memory Array; Equation Editor; Data Math - Agilent Technologies ENA Series User Manual

General Principles of Operation
Data Processing

Corrected Data Array

Unlike the raw data array, this array stores the results obtained after error corrections, port
extensions, or the fixture simulator functions are applied. The user is allowed to read/write
data from/to the corrected data array.

Corrected Memory Array

Data → Mem
By pressing - , the contents of the corrected data array will be copied
to this array. The user is allowed to read/write data from/to the corrected memory array.

Equation Editor

Data processing is carried out by creating a equation based on the corrected data array.

Data Math

Data processing is carried out using the corrected data array and the corrected memory
array. Four types of data processing – addition, subtraction, multiplication, and division –
are available.

Electrical Delay/Phase Offset

An electrical delay and a phase offset are applied to each trace. By setting an electrical
delay, a linear phase that is proportional to the frequency will be added or subtracted. On
the other hand, setting a phase offset adds or subtracts a phase that is constant throughout
the frequency range. Incidentally, data processing performed from this point on in the
flowchart is applied to both the data array and the memory array.

Data Format/Group Delay

Complex data consisting of the real parts and the imaginary parts are converted into scalar
data according to the data format of user's choice. Group delays are also calculated here.

Smoothing

By enabling the smoothing function, each point in a sweep measurement will be replaced
by a moving average of several measurement points nearby. The number of points used in
calculating a moving average is determined by the smoothing aperture set by the user. The
smoothing aperture is defined by a percentage against the sweep span.

Formatted Data Array/Formatted Memory Array

All results from data processing are stored in the formatted data array and the formatted
memory array. The marker functions are applied to these arrays. The limit test is applied to
the formatted data array. The user is allowed to read/write data from/to these arrays.

Offset/Scale

Each set of data is processed so that traces can be drawn on the screen. Particular scaling
depending on the data format is applied using the position of the reference line, the value of
the reference line, and the scale/graticule settings.
732 Appendix E