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b)
Local
sense
(Internal
2-wire,
connected
as
Fig
8.3(b),
Remote
Sense
OFF)
Full
Range
and Zero
values
—
Routine
for
Table
8.4(b)
(i)
4708
Select
OUTPUT OFF
and
Q
Deselect
Remote
Sense.
(ii)
4708
Press required
resistor
(RANGE)
key:
The
previously-calibrated value appears
on
the
OUTPUT
display.
(iii)
4708
and
Press
OUTPUT ON+
and measure
the
resistance-
value of
the
internal resistance,
measuring
equipment
(iv)
4708
Set
the
measured
value
on
the output
OUTPUT
display
4^
t Keys
(v)
4708
CAL
Press
to
store
OUTPUT
display
value.
Key
(vi)
4708 Zero
Press
and
repeat operations
(iii)
to
(v)
Key
for
this
RANGE
selection.
6.
Calibration
sequence
Press
O
key and
calibrate the resistors in the step se-
quence
of Table
8.4
(a)
and
(b),
using
the Calibration
Routine
at
para 7
(a)
or
(b).
Refer
to
para 5
for
connections
in
Remote
Sense
(Fig
8.3(a))
-
only
the
value of
the internal
Standard
Resistor
is
measured.
In
Local Sense
(Fig
8.3
(b))
a 4-wire
method
is
used
to
exclude
the resistance
of
the external leads
from
the
measured
value.
7.
Calibration Routine:
Measurement and
Storage of
the values
of
an
internal
resistor,
a)
Remote
Sense
(Internal
4-wire,
connected
as
Fig
8.3(a))
Full
Range
values
—
Routine
for
Table
8.4(a)
(i)
4708
Select
OUTPUT OFF
and
£2
Select
Remote
Sense
(ii)
4708
Press required
resistor
(RANGE)
key;
The
previously-calibrated value
appears
on
the
OUTPUT
display
(iii)
4708 and
Press
OUTPUT ON+
and measure
the
resistance-
value of
the internal
resistor,
measuring
equipment
(iv)
4708
Set
the
measured
value
on
the
OUTPUT
OUTPUT
display
t
KEYS.
(v)
4708
CAL
Press
to
store
OUTPUT
display
value.
Key
(vi)
4708
Set
OUTPUT
OFF.
(vii)
Repeat
operations
(ii)
to (v)
for
each
step
of
Table
8.4(a).
(vu)
4708
Set
OUTPUT
OFF.
(viii)
Repeat
operations
(ii)
to
(viii)
for
each
step
of Table
8.4(b).
8-9
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