HP 3455A - Page 46

Model 3455A Seclion JV
Table 4-B. Foar-Wira Ohm Accuracy Teat
Decade
Resistor
34S5A
Range
icon 0.1
1 kQ
1
10 kO 10
100 kU 100
1 MO 1 K
10 MO 10 K
I
A)
Test Limits
(High R«s. Off)
(Bl
Test
Limits
(High Res. On)
34 Hour*
90 Day’
34 Hour* 90
Day*
0.099993 to 0.100007
0.099990 to
0.100010
0.999971 to
1.000039
9.99951 TO
10.00049
99.9975 to
100.0035
999.876
to
1000.124
9989.96
to
10010.04
0.999960
to
1.000040
9.99935 to
10.00065
99.9959 to
100.0041
999.860 to
1000.140
9989 95
to 10010.05
’These test limits do not
include the temperature
coefficients that mutt be added if the
instrument
is
operated outside of
the temperature
range over mhich the 24-hour or 90-day
specifications apply (tee
Table 1-1). Derive 6-month test
limits
fromOhms Accuracy specifications
listed
in
Table
1-1
.
b. Using a shielded cable equipped with banana-plug
connectors, connect the Decade Resistor to the INPUT
of the 345SA. Set the Decade Resistor to 100 K ohms.
c.
Algebraically
add the Decade Resistor's correction
factor to
the
3455A reading.
The
algebraic sum
should
be within the test Limits given in Table 4-7, verifying the
34S5A
2-wire
ohms accuracy.
d. Set
the 34S5A controls
as
follows:
FUNCTION 4 WIRE K OHM
RANGE 0.1
HIGH RESOLUTION OFF
e. Set the Decade Resistor to
100
ohms. Connect a
shielded cable, equipped with banana-plug connectors,
between
the 34SSA OHM SIGNAL output and the input
of the Decade Resistor.
{Leave
the other cable con-
nected
between
the 345SA INPUT and the input of the
Decade Resistor).
f. Algebraically add the Decade
Resistor’s
correction
factor to the 345SA reading. The algebraic sum should
be
within
the Test Limits
given
in Table
4-8
(A),
verify-
ing
the 3455A
4-wire
ohms accuracy
with High Resolu-
tion off.
g.
Set the 34SSA RANGE to 1 and HIGH RESOLU-
TION
to
ON.
Set
the Decade Resistor to 1,000 ohms.
h. Algebraically add the Decade Resistor’s correction
factor to
the 3455A reading. The algebraic sum
should
be
within the
Test
Limits given
in
Table
4-8(B),
verify-
ing the 345SA
4-wire
ohms accuracy
with
High Resolu-
tion on.
i. Repeat Step h for each additional Decade Resistor
setting and 34SSA Range listed in Table
4-8
(B).
4-38.
DC VOLTMETER INPUT RESISTANCE TEST.
DC Standard
Systron Donner Model MI06A
Resistor
(1
MO
±
0.01<!’'o 1/4
W
-hp- part
number
0811-0202)
a.
Connect the
low
output of the DC Standard to the
Low Input terminal of the 34SSA. Using short clip leads
insert the 1
megohm
resistor in
series between the DC
Standard's
high output and the High INPUT terminal
of the 34SSA. Connect a clip lead across the resistor.
b. Set the 3455A controls
as follows:
FUNCTION
DCV
RANGE
10 V
HIGH
RESOLUTION ON
GUARD
ON
c. Adjust the
DC Standard for a 34SSA reading
of
+ 10.00000 V.
d.
Remove the clip lead from across the I
megohm
resistor.
e. The 3455A
reading should be between 9.9S>900
V
and
10.00000 V, verifying that the input
resistance
is
greater than
10*^
ohms.
f. Set the 3455A RANGE to
100 V; AUTO-CAL off.
Reconnect the clip lead across
the 1 megohm resistor.
g.
Adjust the DC Standard
for a 34SSA reading of
+ 10.00000
V.
h.
Remove
the clip lead
from across the 1 megohm
resistor.
i. The
3455A reading should be
between
+
9.0900 V
and +
9.0917 V, verifying that the input resistance is 10
megohms ±
O.l^o.
4 39 PERFORMANCE
TEST.
Equipment Required:
4-40.
DC VOLTMETER
ACCURACY
TEST.
4-9