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STEP
RANGE
VOLTAGE
DIAL
POSITION
OPERATION
t.
100
40.00000
Adjust
DECK A
4
to within
30
uv
of step
s.
u.
100
5X.
00000
Record
voltage
indication
within
30
uv.
V.
100
60.00000
Adjust
DECK A
6
to within
40
uv of
step
u.
w.
100
7X.
00000
Record
voltage
indication
within
40
uv.
X.
100
80.00000
Adjust
DECK A
8
to
within
40
uv
of
step
w.
V-
100
9X.
00000
Record
voltage
indication
within
60
uv.
2.
100
100.00000
Adjust
DECK A
10
to
within
60
uv of
step
y.
Figure 4-12.
MODEL
343A
PRELIMINARY
LINEARITY
ADJUSTMENTS
(Sheet
2
of
2}
4-76.
TEMPERATURE
STABILIZATION
a.
Install
all
instrument
covers.
b.
Set
RANGE
to
100 and
voltage
dials
to
100.00000,
c.
Operate the instrument continuously
for
at least
2
hours
in
an ambient temperature of
23°C ±1°C,
prior to
beginning
final
calibration.
4-77.
IVIODEL
343A FIMAL
CALIBRATION
4-78.
Final calibration
of
the
Model
343A
consists
of
the
tests
and adjustments of paragraphs 4-79 through
4-84.
Calibration
should be
completed without
interruption,
and
control positions
should
be maintained from
step
to step
unless
otherwise
instructed.
NOTE!
Ensure
that the
ambient
temperature
condi-
tions specified
in
paragraph 4-76
are
maintained
throughout
the
remainder
of
the
Model 343A
calibration.
4-79.
ZERO OUTPUT ADJUSTMENTS
a.
Unfasten
the
top cover
and
slide
back
just
far
enough
to
expose
the beta
string calibration controls.
b.
Connect
the
845
AR
to the
Model 343
A
output
ter-
minals,
with
the
Model
343A
negative
OUTPUT
terminal
connected
to
chassis
ground.
c.
Set the
Model 343
A RANGE
to
10
and
voltage
dials
to zero.
d.
Zero
the
845
AR
on
the
1
microvolt
range.
e.
Adjust
the
10V
ZERO
ADJUST
control
for a null
indication
(±2
microvolts)
on
the
845AR.
f.
Set the
Model
343A
RANGE
to
100,
and
adjust the
100V
ZERO
ADJUST
control
for a null indication
(±2
microvolts)
on
the
845
AR.
g.
Set the
Model
343A
RANGE
to
1000,
and
adjust the
1000V
ZERO ADJUST
control
for
a
null
indication
(±10
microvolts)
on
the
845
AR.
4-80.
BETA
STRING LINEARITY
ADJUSTMENTS
4-8
1
.
Deck "B"
Adjustments.
a.
Connect
the
equipment
as
shown
in
Figure 4-13.
SIMPLIFIED
MODEL
343A
Figure 4-13.
BETA STRING LINEARITY TEST SETUP
4-17
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