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Model 3455A
Section
IV
FUNCTION
DCV
RANGE
I
kV
HIGH RESOLUTION
OFF
GUARD
ON
CAUTION
The dc
standard's output
should be turned
on and
the voltage
adjusted
by upranging or
downranging
the
standard whenever
the
standard's output
needs
to
be changed.
If
a
3455A
input voltage greater
than 100
V
is
needed,
the following
procedure should
always be followed.
p.
Turn
the
dc standard's output
on and by
the
fol
lowing
method
adjust the
standard
for
an output of
+
1000.00 V:
1.
Set the
dc
standard's
first
decade
to
"0".
2.
Uprange
the
dc standard
to the
1000
V
range.
3.
Increase the standard's
first
decade
so
that
1000
V
is
reached by
increasing the voltage
in
100
V
increments.
q.
Set the
Reference
Divider's
Standard
Cell
switch
to
the
Locked
position.
Adjust
the
DC
Standard's
out-
put voltage
and
vernier controls for a
zero reading
on
the
null
meter.
r.
Downrange
the
Null
Meter
and
adjust
the
Reference
Divider's
coarse
and
fine
controls for
a
null
indication.
Repeat
until
a
null
is
obtained
on
the
3
microvolt range.
s.
Set the
Reference
Divider's
Standard
Cell
switch
to
Open. Allow
ten
minutes
for the
Reference Divider
to
warmup
and
stabilize.
Table
4-M. DC
Accuracy
Tnt
(High Resolution
Off).
Divider
Output
3455A
Range
24
Hour
Test
Limits
90
Day
Test
Limits
1000 V'
1000
V
999.95
to
1000.05
999.92
to
1000.08
500
V
1000
V
499.97
to
500.03
499.96
to
500.04
100
V
100
V
99.995
to
100.005
99.992
to
100.008
0.1
V
0.1
V
.099992
to
1.00008
.099989
to
.100011
'For
positive
raadirt
0
s only.
Do
not apply negative voltages
greater
than
-500
V
dc.
Table 4-12.
DC
Accuracy
Test
(High Resolution
On).
II
Q
O
3455A
R»ng>
?4 Houf
T«R
Limit*
90 0«v
Tffft
Limiti
1000
V
1000
V
S99.9S7
to
1000.043
999.927
to
1000.073
SOO
V
1000
V
499.977
10
600.023
499962
to
500.038
lOOV
1000
V
99.99310
100.007
99.990
to
100.010
100
V
100
V
99.9957(0
100.0043
99.992710
100.0073
50
V
100
V
499977
to
50.0023
49.9962
to
50.0036
10
V
100
V
99993(0
10.0007
9.9990
10
10.0010
5V
lOV
4.99987(0 5.00013
4
99972
10
5.00026
1
V
10
V
0.99995
10
1
.00005
0.99992(0
1.00008
05
V
1
V
0.499981
to
0.500019
0.499966
to
0.500034
0
1
V
}
V
0
099993lo0
100007
0.099990
to
0.100010
'For
positive
readings
only.
Oo
not apply negative voltages
greater
than
-
500
V
dc.
t.
Set
the Reference Divider's
Standard
Cell switch to
Momentary
and,
if
necessary, readjust the
fine
control
for
a
null indication.
Release the
Standard
Cell switch.
NOTE
AUTO-CAL
may
have
to
be
turned off
4-11
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