Fluke 341A - Page 43

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 845AR to the
Model 343A output ter-
minals, with the
Model 343A negative
OUTPUT
terminal
connected
to
chassis ground.
c. Set
the Model 343A
RANGE to
10
and voltage dials
to zero.
d.
Zero the 845AR 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 845AR.
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