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4708
AC
Millivolts
(HF) Calibration
(1
mV
-
1
0OmV)
(Using
verified
4708
AC
IV
and
lOV
Ranges,
10%
Range
Correction Factor
and
AC
DVM).
Summary
The
verified
AC
output values of
IV
on
the
IV
Range; and
lOV
on
the
lOV Range
are
used
to
measure
the
4708
linearity
error
at
IV
on
the
lOV
range.
From
the
linearity
measurement,
a
10%
of range
Linearity
and
Scaling Factor
'C'
is
derived.
This
factor
is
subsequently used
to
correct the
4708
output
setting at
10%
of
range,
to
standardize a
DVM
for calibration
of
the
next range
down.
Calibrate the
4708
at
or close
to
the calibration points
in
the
table.
N.B. These
calibrations are
not
fully traceable.
Nominal
Cal. Points for
HF
Millivolt
Ranges
4708
AC OUTPUT
RANGE/
FREQUENCY
4708
Nominal
OUTPUT
Voltage
Frcq.
Band
set
by
4708
lOOmV
IMHz
1
00.0000m
V
HF
10m
V
IMHz
lO.OOOOmV
HF
ImV
IMHz
1.
0000m
V
HF
Note:
It is
assumed
that
the
IV
and
lOV
ranges
have been
calibrated
at
the
required
HF
calibration points.
It is
also
assumed
that
the
Millivolt
(LF)
Calibration has
been
completed.
Interconnections
FIG
1
(10V
and
IV Ranges)
FIG
2 (lOOmV
to
ImV
Ranges)
Stage
1
Derive the
Linearity
and
Scaling Factor
'C'
as
follows (C
is
a
number
of
value close
to
0.1)
a.
Ensure
that
the Millivolts
(LF)
Calibration has
been
completed.
Ensure
that the
4708
has
been
calibrated
and
verified
at
AC
lOV
and
IV
HF
(IMHz)
Full
Range. Record
the
measured
values
as follows:
4708
lOV
FR
setting
-
10.000,00V
Actual output voltage
-
'VI'
4708
IV
FR
setting
-
1.000,000V
Actual output voltage-
*V2'
b.
Calculate
IV
correction
'V3'
=
1/W2
c.
With
OUTPUT
OFF
connect a
DVM
to the
4708
termi-
nals
using the exact 4-wire connections
as
in
Fig.l.
Set
the
DVM
to
measure
AC
on
its
IV
range.
d.
On
4708,
select the
IV
range
and
Remote
Sense,
Set
Frequency
to
IMHz.
Set
OUTPUT
display reading
to
V3.
Set
OUTPUT
ON,
and
note
the
DVM
reading
as
'Vt*.
Set
OUTPUT
OFF.
e.
On
4708,
select the
lOV
range
(Remote
Sense).
Set
4708
OUTPUT
display reading
to
IV.
Set
OUTPUT
ON
Adjust
the
OUTPUT
display reading as
'Vt'.
f.
Note
the
4708
OUTPUT
display reading as
'V4'.
8-15
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