Trace Math Operation; Electrical Delay; Transform (Option 100 Only); Formatting - Agilent Technologies 8712ET Programmer's Manual

Trace Data Transfers
Internal Measurement Arrays

Trace Math Operation

This selects either the corrected data array, or the corrected memory
array, or both to continue flowing through the data processing path. In
addition, the complex ratio of the two (Data/Memory) can also be
selected. If memory is displayed, the data from the memory arrays goes
through exactly the same data processing flow path as the data from the
data arrays.

Electrical Delay

This block adds or subtracts phase, based on the settings of Phase Offset,
Electrical Delay, and Port Extension. The Electrical Delay and Port
Extension features add or subtract phase in proportion to frequency. This
is equivalent to "line stretching" or artificially moving the measurement
reference plane. (See your analyzer's User Guide for more details on
these features.)

Transform (Option 100 only)

This block converts frequency domain data into distance domain, or into
an SRL impedance value when measuring fault location or SRL. The
transform employs an inverse fast Fourier transform (FFT) algorithm to
accomplish the conversion.

Formatting

This converts the complex number pairs into a scalar representation for
display, according to the selected format (e.g. Log Mag, SWR, etc). These
formats are often easier to interpret than the complex number
representation. Note that after formatting, it is impossible to recover the
complex data.

Formatted Arrays

The results so far are stored in the formatted data and formatted
memory arrays. It is important to note that marker values and marker
functions are all derived from the formatted arrays. Limit testing is also
performed on the formatted arrays. These arrays are accessible via GPIB
and referenced as CH[1|2]FDATA and CH[1|2]FMEM.
6-26 Programmer's Guide