Fluke 341A - Page 46

341
A
343A
j.
Repeat step
e.
It. Adjust
the
100V RANGE ADJUST control
for
zero
(±100
microvolts)
on 845AR No. 2.
l. Set the
343A
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
845AR 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
845AR
on the 1 microvolt range.
f.
Set the Model 343A 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 343A is complete.
Set the
FUNCTION switch to OFF and disconnect equip-
ment.
7
50
A
332B OUTPUT
VOLTS
343A
845AR 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