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Model
3455A
Section
V
h.
Disconnect
the
DC
Transfer Standard. Set the
3455A
FUNCTION
to
4-WIRE
K
OHMS
and
RANGE
to
1
.
i.
Using
short pieces
of
number
20
AWG
insulated
solid
copper
wire,
connect
the
1
kilohm Standard
Resistor to the
3455A INPUT
and
OHMS
SIGNAL
terminals
in
a
4-wire
ohms
measurement
configuration.
j.
Adjust
the
1
kilohm
pot
for a
3455A
reading
of
1.000000
kilohm.
k.
Disconnect
the
1
kilohm Standard
Resistor
and
connect
the
100
K
standard
resistor
using the
same
4-
wire
ohm
measurement
configuration.
l.
Set the
34S5A
RANGE
to 100.
m.
Adjust the
1
megohm
pot
for a
3455A
reading
of
100.0000 kilohm
(±
1
count).
n.
Set the
3455A
RANGE
to
1
.
Repeat
Steps
i
throu^
m
to
obtain
optimum
adjustment.
5-15.
RMS CONVERTER ADJUSTMENTS
(A1S
Assy.,
Standard
Model
3455A
Only).
NOTE
For
3455A
Option
001
instruments, refer to
the
Average
Converter
Adjustments
(Para-
graph
5-16).
Equipment
Required:
AC/DC
Digital
Voltmeter
(-hp-
Model
3490A
or
3455A)
DC
Standard (Systron
Donner Model 106A)
AC
Calibrator
(-hp-
Model 745 A)
a.
Set the
345SA
controls
as
follows:
FUNCTION
ACV
RANGE
10
V
AUTO CAL
ON
GUARD
ON
TRIGGER
INT
MATH
OFF
AC-AC/DC(Rear
Panel)
AC
b.
Connect
a
short across the
3455A INPUT
terminals.
c.
Set the
Digital
Voltmeter
(DVM)
to
measure dc
volts
(auto
range).
Connect
the
DVM
low
input terminal
to
TP6
and
the high input terminal to
TPS.
d.
Adjust
R65
(PREAMP OFFSET
ADJ)
for a
DVM
reading of
0
V
±
10
microvolt.
e.
Connect
the
DVM
Low
to
TP6
and High
to
TPS.
Adjust
R56 (ABS
AMP
OFFSET
ADJ)
for a
DVM
reading
ofO
V
±
10
microvolts.
f.
Disconnect
the
DVM.
Connect
a
clip
lead
between
TP3
and TP6.
Adjust
R16
(INT
AMP
OFFSET)
for a
345SA
display reading
of
0
V
±
1
count.
g.
Remove
the
clip
lead
from
TP3
and TP6.
Adjust
R29
(LOGGER
AMP
OFFSET)
for a
3455A
display reading
between 0.0998
V
and 0.1002
V
with
a
100
mV,
100 Hz
signal
applied
to
the input
terminals.
h.
Set the
rear
panel
AC
-
AC/DC
switch to
AC/DC.
Set
the
DC
Standard
for
an output
of
10
V
dc.
Connect
the
DC
Standard output
(Negative
Polarity) to the
34S5A
INPUT.
i.
Note
the
34SSA
reading.
j.
Reverse the
polarity
of
the
DC
Standard's
output and
note
the
34SSA
reading.
k.
Adjust
R51 (AC-
DC TURNOVER
ADJ)
so
that the
readings
in
Steps
i
and
j
are
equal ±
0.0005
V.
l.
Disconnect the
DC
Standard
from
the
3455A
INPUT.
Set the
rear
panel
AC-AC/DC
switch
to
AC.
m.
Set the
3455A
RANGE
to
I
V.
Connect
the
DVM
(AC
function,
autorange)
Low
to
TP6
and
Hi^
to
TPS.
Set the
AC
Calibrator
for
an output
of
1
V, 100
Hz.
Con-
nect the
AC
Calibrator
output
to the
3455A
INPUT.
n.
Adjust
R74
(1
V, 100
Hz ADJ)
for
a
DVM
reading
of 1.00000
V
±
1
count.
Disconnect
the
DVM.
0
.
Adjust
R17 (GAIN)
for
a
3455A
reading
of
1
.00000
V
±
5
counts.
NOTE
If,
in
the following
steps,
there
is
insufficient
adjustment
range
for the
1
V,
10
V
or
100
V
high-frequency
(40
kHz)
adjustment,
the
adjustment range can
be expanded by
remov-
ing
the appropriate
jumper
wire
on
the
A15
board
(see
Table
5-2).
Refer
to
the
AIS
board
component
locator (Section
VIII)
for
jumper
locations.
p.
Set the
AC
Calibrator
frequency
to
40
kHz. Adjust
R75
(1
V,
40 kHz ADJ)
for a
34S5A
reading
of 1.00010
V
(tolerance
= + 20
counts).
q.
Set the
3455A
RANGE
to
10 V.
Set the
AC
Calibra-
tor for
an output
of
10 V,
100
Hz,
Adjust
R73
(10 V,
100
Hz ADJ)
for a
3455A
display
reading
of 10.0000
V
±
5
counts.
T.
Set the
AC
Calibrator
frequency
to
40
kHz. Adjust
R72
(10
V.
40 kHz ADJ)
for
a
3455A
reading
of
10.0010
V
(tolerance
= + 20
counts).
s.
Set the
345SA
RANGE
to
100 V.
Set the
AC
Cali-
brator
for
an output
of 100 V, 100
Hz. Adjust
R94
(100 V,
100
Hz ADJ)
for a
3455A
reading
of 100.000
V
±
5
counts.
5-3
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