HP 3457A - 4-68. DC Voltage Function - Gain Test

3457A
Operational Verification Tests
DC Voltage Operational Verification Tests Cont’d
2.
Set
the
HP
3457A
to
the
DC
Voltage
function
(DCV)
and
the
number
of
digits
displayed
(DIGITS.
DISP)
to
six.
3.
Test
the
HP
3457A
input
offset
on
the
30
V,
3
V,
and
300
mV
ranges
and
record
the
reading
of
each
range
on
the
Test
Record
provided
at
the
end
of
this
section.
Begin
with
the
30
V
range
to
allow
any
thermal
voltages
which
might
affect
the
readings
on
the
lower
ranges
to
dissipate.
4.
If
any
of
the
offset
readings
are
beyond
the
limits
specified
in
Table
4-21
and
on
the
Test
Record,
the
instrument
should
be
calibrated.
Refer
to
Section
V
of
this
manual
for
calibration
procedures.
5. Remove the short from the Front Panel Input Terminals.
4-68. DC Voltage Function - Gain Test
4-69.
Equipment
Required.
A
set
of
low
thermal
cables
and
a
DC
Voltage
Standard
capable
of
providing
300
mV
(+
.0012%),
3
V
(+
.0006%)
and
30
V
(+
.0013%)
is
required
for
this
test.
1.
Set the
output
of
the
DC
Voltage
Standard
to
300
mV
and
connect
it
to
the
HP
3457A
front
panel
HI
and
LO
Input
Terminals.
2.
Use
the
Test
Record
to
record
the
full-scale
readings
for the
300
mV,
3
V,
and
30
V
ranges.
Begin
with
the
30
V
range.
3.
If
any
of
the
full-scale
readings
are
beyond
the
limits
specified
in
Table
4-21
and
on
the
Test
Record,
the
instrument
should
be
calibrated.
Refer
to
Section
V
of
this
manual
for
calibration
procedures.
4.
Reduce
the
output
of
the
Voltage
Standard
to
0
volts
and
disconnect
it
from
the
HP
3457A,
3457A
[34570
|
34578
90
day
limits
1
year
limits
Input
|Range
|
Set
Up
High
|
Low
High
Low
short
|
30
v
|
ocv
+
00.00020
v
-
00.00020
v
+
00.00020
v
-
00.00020
v
short
|
3
v
|
ocv
+
0.000007
v
-
0.000007
v
+
0.000007
v
-
0.000007
v
short
|300
mv]
pcv
+000.0040
mv
=000.0040
mv
+000.0040
mv
-000.0040
mv
300
mv|
300
mv|
pcv
+300.0115
mv
+299.9885
mV
+300.0145
mv
+299.9855
mV
3v
|
3}
bev
+
3.000058
v
+
2.999942
V
+
3.000082
v
+
2.999918
V
30
v
|
30
v
|
bev
+
30.00125
v
+
29.99875
V
+
30.00140
V
+
29.99860
V
Table 4-21. DC Voltage Test Limits