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Set
OUTPUT
OFF.
g.
From
the
values
VI
and
V4
calculate the
lOV
range
linearity
correction
and
scaling factor 'C' as follows:
C
=
(V1
X
V4)/100
Note:
The optimum
resolution
quoted
above
the
boxes
in this
column
may
not
be
achievable with
the
DVM
in use.
In these cases
it
is
permissable
to
reduce
the resolution
by
a
maximum
of
1
digit
only.
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
=
N.B.
The
following
calibration
from
the front
panel can only
be
carried
out
if
the
IEEE
Address
switch
on
the rear
panel
is
set to
Address 31(11111).
Set
OUTPUT
display
to
this
value.
d.
Set
the
AC
DVM
to
measure
lOOmV
e.
Set
4708
OUTPUT
ON,
allowing
the
output
to
settle.
Note
the
DVM
reading
as 'V(lOOt)'.
f.
Set
4708
OUTPUT
OFF
and
reconnect
the
DVM
to
the
4708
terminals
in
2-wire
as
shown
in
Fig.
2.
g.
Set
4708
to
its
AC
lOOmV
range.
(Remote
Sense
is
automatically
deselected.)
Set
OUTPUT
ON
and
adjust the
4708
Output
for
a
DVM
reading of V(lOOt).
Press
the
'CAL'
pushbutton and observe
the
DVM
reading.
h.
Repeat
operation
(g) until
the
post-CAL
DVM
reading
is
within
l|iVofV(100t).
(Ifcalibrating
a
Spot Frequency,
re-press the
SPOT
key
to deselect).
Stage 3
To
Calibrate the
AC
10mV
Range
Full
Range
Output
a.
Ensure
that
the
DVM
is
still
connected
to
the
4708
terminals as
shown
in
Fig.
2.
Reselect
the
Spot
Fre-
quency
if
required.
b.
Ensure
that
the
4708
is
set to
the
AC
lOOmV
range.
Calculate
the
value
'lOOmV
x
C'
Set
OUTPUT
display
to
this
value.
c.
Set
the
AC
DVM
to
measure
lOmV.
d.
Allow
the
output
to
settle.
Note
the
DVM
reading
as
'
V(lOt)'.
e.
Set
4708
to
its
AC
lOmV
range.
f.
Adjust
the
4708
Output
for
a
DVM
reading of
V(lOt).
Press
the
'CAL'
pushbutton
and
observe
the
DVM
reading.
g.
Repeat
operation
(f)
until
the
post-CAL
DVM
reading
is
within l|iV ofV(lOt).
Deselect
the
Spot Frequency
if
selected
at
(a).
Stage
2
To
Calibrate the
AC
lOOmV Range
Full
Range
Output
a.
Insert
the Calibration security
key
into
the 'Calibration
Enable' switch
on
the rear panel,
and
turn to
'ENABLE'.
b.
Ensure
that the
DVM
is
still
connected
to
the
4708
terminals as
shown
in
Fig.
1.
c.
Set
the
4708
to
the
AC
IV
range.
Calculate
the
value
'
V3
x
C'.
Calculate
in
6.5
digits
resolution
V3x C
=
V(lOOt)
is
a
transfer
value
V(lOOt)
=
8-16
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