HP 3455A - Page 48

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