Agilent Technologies 4395A - Limit Line Concept

Limit
Line
Concept
Limit Line
Concept
These
are
lines
drawn
on the
display to
represent upper
and lower
limits or
device
specications
with
which
to
compare the
DUT.
Limits are
dened by
specifying several
segments
,
where
each
segment is
a portion
of the
sweep parameter
span. Each
limit segment
has
an
upper
and
a lower
starting limit
value.
Limits
can
be
dened
independently for
the two
channels with
up to
18
segments
for
each
channel
(a
total
of
36 for
both channels).
These can
be in
any
combination
of
the
two
limit
types
.
Limit
testing
compares
the
measured data
with the
dened limits
, and
provides
pass
or
fail
information
for
each
measured
data point.
An out-of-limit
test condition
is indicated
in
the
following ways:
Displaying
a
FAIL
message on
the screen
Emitting
a
beep
Displaying
an
asterisk
in
tabular listings
of data
Writing
a
bit
into
GPIB
event status
register
B
(for
more
information
on
GPIB
event
status
registers
,
refer
to
4395A
Programming
Guide
)
Limits
are
entered
in
tabular
form.
Limit
lines
and
limit
testing
can
be
either
on or
off while
limits
are
dened.
As
new
limits
are
entered,
the
tabular
columns
on
the
display
are updated,
and
the
limit
lines
(if
on)
are
modied
to the
new denitions
.
The
complete
limit
set
can
be
oset
in
either
sweep
parameter
or
amplitude
value
.
How
Limit
Lines
are
Entered
Before
limit
lines
can
be
explained,
the
concept
of
\segments"
must
be understood.
A
segment
is
the
node
of
two
limit
lines
.
Figure A-18. The Concept of Segments as a Point between Two Sets of Limit Lines
Basic Measurement Theory A-29