Agilent Technologies 4395A - Page 382

Data
Processing
F
ormat
This
converts complex
number
pairs
into
a
scalar
representation
for
display
,
according
to
the
selected
format. This
includes
group
delay
calculations
.
Note
that,
once
complex
data
has
been
formatted,
it cannot
be
restored.
See
\Group
Delay"
for
information
on
group
delay
principles
.
Data
Hold
This
keeps
the
maximum
or
minimum
value
at
each
display
point
when
the
data
hold function
is
turned
on
.
Data
Math
This
calculates
the
complex
ratio
of
the
two
(data/memory),
the
dierence (data
0 memory),
or
summation
(data+memory)
when
the
data
math
function
is
selected.
In
addition,
this
function
multiplies
the
ratio
,
dierence
,
or
summation
by
a
constant,
or
subtracts a
constant from
them.
Data
Trace
Arrays
The
results
are
stored
in
the
data
trace
arrays
.
It is
important to
note
those
marker
values
and
marker
functions
are
all
derived
from
the
data
trace
arrays
.
Limit
testing
is
also
performed on
this
array
.
The
data
trace
arrays
are
accessible
via
GPIB
,
or
using
the
internal
disk drive
or
the
memory
disk.
Memory
Trace
Arrays
If
the
data-to-memory
operation is
performed, the
data
trace
arrays
are
copied
into
the
memory
trace
arrays
(data
arrays
are also
copied
into
the
memory
array
at
same
time).
These
arrays
are
accessible
using
the
internal disk
drive
or
the
memory
disk.
When
accessed
via
GPIB
,
these
arrays
are
read-only
.
Scaling
These
operations prepare
the
formatted
data
for
display
on
the
LCD
.
This
is
where
the
appropriate
reference line
position,
reference
line
value
,
and
scale
calculations
are
performed.
A-6 Basic Measurement Theory