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Model
3455A
Section
IV
SECTION
IV
PERFORMANCE
TESTS
4-1.
INTMOUCTIOII.
4-2.
This
section
contains
performance and
operational
verification
test
procedures
which can
be used
to
verify
that
the
345SA
meets
its
published
specifications
(listed
in
Table
M).
All
tests
can
be
performed
without
access
to
the
interior
of
the
instrument.
The
performance
tests
in this
section
do
not
test
the
345SA Math
Functions or
HP-IB
Interface.
These
functions
can
be
tested
using
the operators
test
procedures included
in
Section
III.
4-3.
EQUIPMENT
REQUIRED.
4-4.
The
test
equipment
required
for
the
performance
tests
is
listed at
the
beginning of each procedure
and
in
the
Recommended
Test
Equipment
Table
in
Section
I.
If
the
recommended
equipment
is
not
available,
use
substitute
equipment
that
meets
the
critical
specifica-
tions
given
in
the
table.
4-S.
PERFORMANCE
TEST CARD.
4-6.
Performance
Test
Cards
are
provided
at
the
end of
this
seaion
for
your convenience
in
recording the
per-
formance of
the
34S5A
during
either
test.
These
cards
can be
removed from
the
manual and
used
as
a
perma-
nent record
of
the
incoming
inspection
or
of
a routine
performance
test.
The
Test
Cards
may
be reproduced
without
written
permission
from
Hewlett-Packard.
4-7.
CALIBRATIDN
CYCLE.
4-8.
The 3455A
requires periodic
verification
of
perfor-
mance.
The
performance should
be
tested as
part
of
the
incoming
inspection
and
at
90-day or
6-month
intervals,
depending
on
the
environmental
conditions
and
your
specific
accuracy
requirements.
Two
tests
(performance
and
opertional
verification)
are
provided
in this section.
The
operational
verification
test
should be
performed
as
an incoming
inspection
of
the instrument.
The
complete
performance
test
can be used
at
the
90-day or
6-month
intervals,
and
following
a complete
calibration
of
the
in-
strument.
4-9.
INPUT
TERMINALS/CONTROL SEHINQS.
4-10.
Unless otherwise
specified,
the
test
signals for
the
performance
tests
can
be applied
to
either
the front
or
rear
INPUT
terminals. All
tests
must
be
performed
in
the
INTERNAL
Trigger
Mode
with
AUTO CAL
on and
MATH
off.
For standard
instruments (rms converter)
the
rear
panel
AC
-
AC/DC
switch
must be
in
the
ac
position.
Other
control
settings
are included
in
the
test
procedures.
4-11.
PERFORMANCE
TEST
FAILURE.
4-12.
If
the
3453A
fails
any
of
the
performance
tests
or
operational
verification
test,
perform
the
adjustments
outlined
in
Section
V.
If
the
problem
cannot be
cor-
rected
by
the
adjustment,
refer
to Section VIII for
troubleshooting information.
4
13.
SPECIFICATION
BREAKDOWN.
4-14.
The
dc,
ac
and
ohms
accuracy
specifications
(Table
1-1)
are
grouped
according
to the selected instru-
ment
function,
i.e..
High
Resolution
On
or Off,
ACV
or
Fast
ACV
and
2-Wire
or
4-Wire ohms. Within each
group
there are three
sets
of
specifications:
a.
24 hour
(23*C
±
PC)
b.
90 day
(23°C
±
5®C)
c.
6
months (23*C
±
5*Q
4-15.
The
time period over
which a
set
of
specifications
applies
is
relative
to the
time
the
instrument
is
initially
adjusted
at
the factory
or
is
properly readjusted accor-
ding
to the
procedures
outlined
in
Section V. Before
proceeding with
the dc, ac
and
ohms
accuracy
tests,
it
will
be
necessary to
determine which
set
of
specifica-
tions applies to
your
instrument.
If
the
instrument has
just
been
received
and
is
to
be
tested as
part
of
the
in-
coming
inspection,
test
for the
90-day
specifications.
If
the
instrument has been
readjusted within a period
of
24
hours,
test
for the
24-hour
specifications.
Test
limits for
the
24-hour
and
90-day
specifications are
included
in
the
tables for
the
accuracy
tests.
Test
limits
for the
6-month
specifications
must
be derived
from
the specifications
listed in
Table
1-1.
If
the
instrument
is
operated
outside
for the
temperature range
for a
given
set
of
specifica-
tions,
the
appropriate temperature
coefficients,
listed
in
Table
1-1,
must be added
to those
specifications.
The
test
limits
given
in
the
tables for
the
dc,
ac
and
ohms
ac-
curacy
tests
do
not include temperature
coefficients.
4-16.
Each
set
of
specifications includes
an accuracy
specification for
each
voltage
or
ohms
range.
Accuracy
is
specified
as a
percentage
of
reading plus
an add-on of
one
or
more
digits
(counts).
For example,
the
24-hour
DC
Accuracy
specification for the
1-volt
range (High
Resolution
OfO
is:
±
(0.0031^0
of reading
+
1
digits)
At
full
scale
(1
V)
the
least
significant
display
digit,
equal
to
10 microvolt,
is
O.OOI^o of
reading.
The
full-
scale
accuracy
is
therefore:
4-1
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