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Section
V
DC STANDARD/DIFFERE
NTIAL
VOLTMETER
hp
7408
®
3484A
•
B 30376
OUT
P
UT
CAB LE
hp
110558
Model
3484A
DIGITAL VOLTMETER
hp
3480A
MULTIFUNCTION
@
@ Qi
@
UNIT
hp
3484A
0
@)
@
@
O.
I
F
Figure 5-2.
lnput
Resistance
Check.
f.
Connect de standard
output
to
3484A
input.
Set
de
standard output
to .000000
V.
If 3480A/B
display
indicates
an
offset,
this
must
be
taken into
consideration
when
checking
3484A accuracy
on
the
100
mV range
.
If
-hp-
Model
740B
is being
used
as
de standard,
adjust
740B
ZERO
control
to
return
3480A/B
display
to
zero.
g. Se
t
de
s
tand ard
output
to
+ .100000 V
(+ 100.00
mV).
3480A/B
display
should
be
+ 99 .97
mV
to+
100.03
mV.
h
. Reverse
polarity
of
standard output.
Display
should
be
-
99.97 mV
to - 100.03
mV.
i.
Set de standard
output
to
positive
and
negative
voltages
listed in Table
5-2,
setting 3484A RANGE
switch to
range
.shown
for
each
voltage. Display
should
be
within limits
indicated in
each case.
j
. Repeat
Steps
g
through
i with
line voltages of
103
V
and 127
V
(or
207
V
and
253 V).
5-5.
voe
INPUT RESISTANCE CHECK.
5-6.
100
mV,
1000 mV, and 10 V
Ranges.
Input
resistance
on
the
three
lower
ranges is
>
1010
ohms,
and is
most
easily checked
on
the 1 O V
range using the
following procedure:
5-2
a.
Connect
de standard to 3484A
input as
shown
in
Figure
5-2,
using
a
10 MQ
±
1%
resistor
for
Rs·
The
capacitor in
parallel
with
Rs
reduces
the
effect
of
noise.
Connect
jumper
across
Rs·
Set
3484A
RANGE
to
10
V,
FUNCTION
to
VDC.
b. Set de
standard output
to+
10.000
V.
T
able
5-2.
DCV Accuracy
and
Linearity Check.
DC
STANDARD
3484A
DISPLAY
LIMITS
VOLTAGE
RANGE
±
100.000
mV
lOOmV
±
99.97
mV to
100.03
mV
±
90.000
mV
100 mV
±89.97
mV t
o
90.03
mV
±
80.000 mV
lOO
mV
±
79.97
mV to
80.03 mV
±
70.000
mV
lOOmV
±69.97
mV
to 70.03
mV
±
60.000 mV
100
mV
±
59.97
mV
to 60.03
mV
±
50.000 mV
100 mV
± 49.97
mV t
o 50.03
mV
±
40.000
mV
100mV
±
39.98
mV
t
o 40.02
mV
±
30.000
mV
100
mV
± 29.98
mV
to 30.02 mV
±
20.000
mV
lOOmV
±
19.98
mV to
20.02
mV
±
10.000 mV
lOOmV
±09.98 mV
t
o
10.02
mV
±
100.00 mV
l
OOOmV
±
099.9 mV
to 100.1 mV
±
300.00 mV
1000 mV
±
299.9 mV
to
300.1 mV
±
500.00 mV
1000 mV
± 499.8
mV to 500.2 mV
±
700.00 mV
1000
mV
±
699.8 mV
to
700.2 mV
±
900.00 mV
1000 mV
±899.8
mV
to 900.2
mV
±
1000.00
mV
1000
mV
±
999.8 mV
to
1000.2
mV
±
10.0000
v
10V
±
9.998
v
to 10.002
V
±
9.0000
v
10
v
±8.998
v
to 9.002
v
±
7.0000
v
10V
±6.998
v
to
7.002
v
±
5.0000
v
10
v
± 4.998
v
to 5.002
v
±
3.0000
v
10
v
±2.999
v
to
3.001
v
±
1.0000
v
10
v
±
0.999
v
to
1 .001
v
±
10.000
v
100
v
±
09.99
v
to
10.01
v
±
100.000
v
100
v
±99.98
v
t
o
100.0
2
V
±
1000.00 V
*
1000
v
±
999.8
v
to
1000.2 V
±
100.00
v
1000
v
±
099.9
v
to
100.1
v
*If
·hp-
Model 7408
is used
as
de standard, do
not
apply negative
voltage greater than
-
500
V
.
-
-
-
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