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Model
3455A
Section
IV
Figare
4-6.
DC Common-Mode
Rojoctioo
Toot
h.
Set (he
AC
Calibrator
for
an
output of
I
V.
Con-
High and
Low INPUT
terminals,
nect the
Frequency Counter
to the
output of
the
AC
Calibrator
and
adjust the
AC
Calibrator's
frequency
to
o.
Set the
3455A
RANGE
to
10
V
and
record the
50
Hz
or
60
Hz
±
O.IV#,
corresponding
to the
power-
display reading:
V.
line
frequency being
used.
p.
Remove
the
jumper from
the
3455A
INPUT
ter-
i.
Record
the
34S5A
reading:
V.
minals.
Connect
the
AC
Calibrator output
to
the
34S5A
INPUT.
j.
Disconnect
the
Frequency Counter
and
connect
the
AC
Calibrator
between
the
High
INPUT
terminal
and
q.
The 34S5A
reading
should be
within
00.0100
V
of
chassis
of
the
3455A
as
shown
in
Figure
4-7.
the reading
recorded
in
Step
o,
verifying that the
50
Hz
or
60
Hz
normal-mode
rejection
is
greater
than
60 dB.
k.
Without
disturbing the
frequency
setting, set
the
AC
Calibrator
for
an
output
of
70.7
V
(100
V
peak).
r.
This completes
the
Common-Mode
and Normal-
Mode
Rejection
Tests.
Disconnect
the
AC
Calibrator
1.
The 3455A
reading should
be
within
0.000010
V
of
from
the
3455A and
disconnect the
GUARD
from
the
the reading
recorded
in
Step
i,
verifying that the
50
Hz
High
INPUT
terminal,
or
60
Hz
ac
common-mode
rejection
is
greater
than 160
dB.
4^55.
DC VOLTMETER
INPUT RESISTANCE
TEST.
m. Without
disturbing the
frequency
setting
set
the
AC
Calibrator
for
an output of
7.07
V
(10
V
peak).
Equipment
Required:
Disconnect
the
AC
Calibrator
from
the
3455A.
DC
Standard
(Systron
Donner Model
M106A)
n.
Remove
the 10
K
resistor
from
the
3455A
INPUT
Resistor
(1
MO
±
0.01
1/4
W
-hp- Part
terminals.
Connect
a short
jumper between
the
3455A
Number
0811-0202)
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