Datron 4708 User Handbook Manual page 95

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)
Verification has been
completed.
Ensure
that the
4708
has been
verified at 10
V
and
1
V HF
(IMHz)
Full
Range
(pages 7-14 and
7-15),
and
that the actual
values
are Registered
on
the Ref>ort
Sheet
RSI
Table
3(a) as 'User's
DC
Standard
Value
for Null'.
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
V2
c
.
With
OUTPUT
OFF,
connect a
DVM
to the
4708
terminals
using
the
exact 4-wire connections
as in Fig.
1.
Set the
DVM
to
measure
AC
on
its
IV
Range.
d.
On
4708, select the
IV Range
and
Remote
Sense.
Set:
FREQUENCY
to
IMHz.
OUTPUT
Display reading
to
V3
OUTPUT
ON,
and
note the
DVM
reading
as 'Vf.
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
for a
DVM
reading of
Vt.
f
*
Note
the
4708
OUTPUT
Display reading
as 'V4'.
Set
OUTPUT
OFF.
g
.
From
the values
VI
and
V4
calculate the 10
V
range
linearity correction
and
scaling factor
'C'
as follows:
C
=
VI
X
V4
100
Note:
The optimum
resolutions
quoted
above
the boxes
in this
column
may
not be achievable with
the
DVM
in use. In these cases
it is
permissible
to
reduce the
resolution
by
at
most
1
digit.
Record
in
6.5
digits
resolution
VI =
V2 =
V3 =
Vt
is
a transfer value
Vt
=
Record
in 6.5 digits resolution
V4
=
Calculate
in 6.5 digits resolution
C
=
7-20