M
M
M
O
O
O
D
D
D
I
I
I
F
F
F
I
I
I
C
C
C
A
A
A
T
T
T
I
I
I
O
O
O
N
N
N
A
A
A
V
V
V
A
A
A
I
I
I
L
L
L
A
A
A
B
B
B
L
L
L
E
E
E
–
–
–
P
P
P
E
E
E
R
R
R
F
F
F
O
O
O
R
R
R
M
M
M
A
A
A
N
N
N
C
C
C
E
E
E
E
E
E
H
H
H
N
N
N
A
A
A
N
N
N
C
C
C
E
E
E
M
M
M
E
E
E
N
N
N
T
T
T
C
C
C
H
H
H
A
A
A
R
R
R
G
G
G
E
E
E
A
A
A
B
B
B
L
L
L
E
E
E
T
T
T
O
O
O
C
C
C
U
U
U
S
S
S
T
T
T
O
O
O
M
M
M
E
E
E
R
R
R
S
S
S
E
E
E
R
R
R
V
V
V
I
I
I
C
C
C
E
E
E
/
/
/
R
R
R
E
E
E
L
L
L
I
I
I
A
A
A
B
B
B
I
I
I
L
L
L
I
I
I
T
T
T
Y
Y
Y
E
E
E
N
N
N
H
H
H
A
A
A
N
N
N
C
C
C
E
E
E
M
M
M
E
E
E
N
N
N
T
T
T
C
C
C
H
H
H
A
A
A
R
R
R
G
G
G
E
E
E
A
A
A
B
B
B
L
L
L
E
E
E
T
T
T
O
O
O
C
C
C
O
O
O
N
N
N
T
T
T
R
R
R
A
A
A
C
C
C
T
T
T
I
I
I
F
F
F
T
T
T
H
H
H
E
E
E
R
R
R
E
E
E
I
I
I
S
S
S
O
O
O
N
N
N
E
E
E
.
.
.
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICATION:
MODIFICATION AVAILABLE
ACTION X PERFORMANCE ENHANCEMENT
CATEGORY: AGREEABLE TIME [[]] SERVICE / RELIABILITY ENHANCEMENT
LOCATION [[]] CUSTOMER INSTALLABLE AVAILABLE UNTIL:
CATEGORY: [[]] ON-SITE
X SERVICE CENTER
AUTHOR: DLL PRODUCT LINE: 09E
ADDITIONAL INFORMATION:
© AGILENT TECHNOLOGIES, INC. 2002
PRINTED IN U.S.A.
April 10, 2002
Page 1 of 2
3458A-11A
S E R V I C E N O T E
Supersedes:
3458A-11
3458A Multimeter
Serial Numbers: 2823A04300 / 2823A05200
Reduction of AC Noise When Measuring ACV and Using Twisted Shielded Pair
Cables
To Be Performed By: Agilent-Qualified Personnel
Parts Required:
P/N Description Qty.
8120-5441 Cable Assembly 500mm 2
Situation:
3458A Multimeters in the above range of serial numbers may inject sufficient noise current from the
Guard terminal that some ACV readings (especially low level readings) will be marginal with respect
to the performance test limits. These marginal readings can be moved much closer to nominal by
adding inductive toroids inside the 3458A on the cables connected to both the front and rear Guard
terminals.
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