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HP 5335A - Page 29

HP 5335A
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O
p
e
ration
and
Programming
3-78.
Statistics
Group
3-79.
The
functions
within
the
STATISTICS
GROUP
allow
the
user
to
automatically
accumulate
and
sample
100
(or
1000)
measurements
and
then
determine
and
display
either
the
standard
deviation
or
the
mean
(average)
of
the
sampling.
These
functions
are
selected
by
the
STD
DEV
and
MEAN
keys,
respectively,
which
toggle
on
and
off
with
each
press
of
the
key.
The
indicator
light
will
fight
when
the
function
is
activated.
The
sample
size
is
initially
set
(default
state)
to
100.
Pressing
the
N
=
100/N
=
1000
key
will
alternately
toggle
the
sample
size
between
100
and
1000.
The
indicator
light
within
the
key
will
be
on
for
a
sample
size
of
1000,
and
off
for
100.
NOTE
MATH
calculations
are
done
before
statistics
when
both
are
activated.
3-80.
Selecting
MEAN
produces
one
additional
digit
of
resolution.
Selecting
STD
DEV
will
display
three
digits
for
either
sample
size.
Both
the
Standard
Deviation
and
the
Mean
can
be
displayed
for
a
single
sample.
To
do
this
the
measurements
must
be
made
with
STD
DEV
on
and
the
CYCLE
MODE
set
to
SINGLE.
At
the
end
of
the
N
mea¬
surements
(100
or
1000)
the
standard
deviation
is
displayed.
Then
press
MEAN
to
display
the
mean
of
the
sample.
The
mean
value
is
displayed
with
a
resolution
based
on
the
standard
deviation.
MATH
ii
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NOTE
Statistical
calculations
sometimes
use
data
from
the
measure¬
ment
that
is
not
displayed,
from
the
resolution
lost
when
a
number
has
to
be
rounded
to
the
best
decade.
3-81.
The
SMOOTH
key
selects
a
unique
function
which
“smooths"
the
display
for
easier
reading.
When
SMOOTH
is
on,
the
counter
looks
at
the
resultant
measurement
and
displays
only
the
digits
that
are
relatively
stable.
In
addition,
as
the
measurements
continue
to
cycle,
a
running
average
is
made
to
remove
small
deviations.
The
running
average
is
made
by
assigning
each
new
measurement
a
weight
of
1/10,
and
the
last
display
9/10.
Smooth
Display
=
1/10
New
Measurement
4-
9/10
Last
Display
3-13
a
..
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_
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i

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