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341
343A
j.
Repeat
step
e.
It.
Adjust the
100V
RANGE
ADJUST
control
for
zero
(±100
microvolts)
on
845AR
No.
2.
l.
Set
the
343
A RANGE
to
1000 and
voltage
dials to
1000
.
0000
.
m.
Set
the
750A
input
and
output
switches to
1000.
n.
Adjust the
332B
controls for
1000
volts
output.
o.
Repeat
step
e.
p.
Adjust the
1000V
RANGE
ADJUST
control
for
zero
(±1
millivolt)
on 845
AR
No.
1.
NOTE!
Allow
the
Model 343A
to
stabilize
(approxi-
mately
5
minutes) before
making
the
1000
volt
range
adjustment
.
4-84.
CALIBRATION VERIFICATION
4-85.
The
following
test
should be performed
imme-
diately
following
Model
343A
calibration.
a.
Leave
equipment
connected
as
shown
in
Figure 4-16.
b.
Perform
the
750A
standardization,
paragraph
4-83,
step
e.
Set the
equipment
controls
as
shown
in
Figure 4-17.
The
null
indication
obtained
in
each
step
should be within the
indicated tolerance.
NOTE!
The
null tolerances
listed
in
column
1
(Figure
4-17) apply
to
those instruments
which have
just
been
calibrated;
in
no
case
should
the out-
put
etror
exceed
the
tolerances
given
in
column
2,
which
are
derived
from
instrument
specifica-
tions
found
in
Section
I
of
the
manual.
c.
Set the
Model
343A
voltage
dials to
zero.
d.
Disconnect
the
750A
from
the
Model
343A
OUTPUT
terminals,
and connect
the
845AR
directly to the
Model
343A
OUTPUT
terminals.
Ensure
that the
negative
OUTPUT
terminal
is
connected
to
chassis
ground.
e.
Zero
the
845
AR
on
the
1
microvolt
range.
f.
Set the
Model 343
A RANGE
to
10 and
voltage
dials
to zero.
The 845
AR
should
indicate
zero
(±5
micro-
volts).
g.
Set the
Model
343A
RANGE
to 100.
The
845AR
should
indicate
zero
(±5
microvolts).
h.
Set the
Model
343A
RANGE
to 1000.
The
845
AR
should
indicate
zero
(±20
microvolts).
i.
Calibration
of
the
Model 343
A
is
complete.
Set the
FUNCTION
switch
to
OFF
and
disconnect
equip-
ment.
7
50
332B
OUTPUT
VOLTS
343A
845
A
R
NO.
2
NULL
TOLERANCE
INPUT
OUTPUT
RANGE
VOLTAGE
DIALS
1
2
M
1.0
10
10
1.000000
mM
5
10
10
5.000000
1
1
wm
10
10
10
10.000000
100
uv
300
uv
mm
10
100
100
100
uv
300
uv
mm
50
100
100
100
uv
1.5
mv
100
100
100
100
100 uv
3
mv
1000
100
1000
1000
100.0000
100
uv
3
mv
1000
500
1000
1000
500.0000
100
uv
15
mv
1000
1000
1000
1000
1000.0000
100
uv
30
mv
Figure 4-17.
MODEL
343A
OUTPUT VOLTAGE REQUIREMENTS
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