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Model34904
Section
V
5-r.
TNTB0DUCTIoN.
5-2.
This
section
contains
performance
tests
and adjust-
ment
procedures
for the Model 3490A
Multimeter.
The
performance
tests determine
whether
your
instrument
is
operating
within its
published
specifications.
The adjust-
ment
procedures are
provided
to help
you
maintain
your
instrument
within specification
limits.
5.3.
RECOMMENDED TEST
EOUIPMENT.
54. Test
equipment
required
for
the performance
tests
and
adjustment
procedures
is listed in
Table 5-l . Any
equipment
that
satisfies
the critical specifications
given
in the table
may be
substituted for the
recommended
model.
5.5. TEST RECOBD.
5-6.
A
Performance
Test Record
is
provided
at
the
end
of this
section for the
purpose
ofrecording the results of
the
Performance
Tests.
This
record
lists
all of the tested
specifications
and
their
acceptable
limits.
This record
can
be removed
from the manual and retained
as a
permanent
record
of the incoming inspection or routine
maintenance performed
on
the instrument.
This record
may
be reproduced
for
your
use without special permis-
sion.
SECTION
V
MAI NTENAN CE
PERFORMANCE
CHECKS
S7.
PERFORMANCE
TESTS.
5-8. Use the
following test
procedures
to determine
whether
your
instrument
is
opefating within its
pub-
lished specifications.
The test limits
given
in
the
accur-
acy
tests
and on the
performance
test record compare
the instrument
to
the 90-day specifications
given
in
Table l-l
. However,
if
your
accuracy requirements are
met
by other
specifications, such
as
the
30-day or
Gmonth specifications,
the
test
limits
should
be
adjusted
accordingly.
The
performance
of the
instrument
should
be
tested
upon
receipt
and
at regular
intervals
deter-
mined
by
your
accuracy
requirements. Refer
also
to Mil.
Spec. MIL{45662A.If
the
3490A fails to meet one or
more
of its specifications,
refer to the
Adjustment
Procedures,
Paragraph
5-51. The
3490A and test equip-
ment
should
be
operated
ät normal
line
voltage with the
3490A
rear
panel
line selector
switches set
as
instructed
in
Figure
2-1. Allow at least
one hour
warm-up
time
for
the
3490A
before beginning
the following
tests.
$9.
DC
VOLTMETER
ACCURACY
TEST.
5-10.
A
dc voltage
standard
(-hp-
7a0B) is required for
this
test.
Connect
Guard to
Input
Low
or damage
to
the instrument
may result.
a.
Set 3490A
FUNCTION
to
DC, RANGE to
.l
V.
b.
Connect
dc standard
between
INPUT
HIGH
and
LOW
terminals.
c.
Select 3490A
ranges
and dc standard
positive
and
negative
outputs
listed
in Table
5-2. Display should
be
within
limits
shown in
each case.
$11. AC
VOLTMETER
ACCURACYTESTS.
5-l
2.
Because
of
the
voltage range
and bandwidth of
the
3490A
ac voltmeter
circuits, more than
one
test setup is
required
to verify the
accuracy specifications. The
-hp
Model
745A/746A
AC Calibrator may be used
to
check
the
accuracy of
all ranges
at
frequencies up.to I
l0 kHz;
however,
the
accuracy of
this
sigral
source alone in some
cases
may not
be
great
enough to ensure a valid test of
Table
5-2. DC
Voltmeter Accuracy.
3490A
Range
DC
Standard
Output
Display Limits
.1 V
1V
10v
100 v
1000
v
r
0.010O0
V
r
0.05000
V
r
0.10000
V
t
o.10000 v
r
0.50000 V
r
1.00000 v
1
1.00000 V
i
10.0000 v
1
10.0000
V
r
100.000
V
I
100.000
v
i
500.000 v
r+
1000.00 v
t
.009995 to
.010OO5
V
l
.049990
to
.050010 V
t
.099985 to
.10001 5 V
I
0.09997 to O.10003 V
I
0.49994 to
0.50006
V
r
0.99990 to 1
.0001O
V
!
00.9997 to 01 .Oq)3 V
t
09.9990 to 10.0010 V
t
009.997
to
010.003
V
t
099.990 to
10O.O10
V
10099.97
to
010O.O3 V
r
0499.92 to 0500.08 V
+
(x199.86
to 1000.14 V
*
lf
-hp-
7408 DC
Standard
is
used, do
not
apply
negative
voltage
greater
than
-
500
V.
5-l