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2-Wire
Ohms
Verification
Routine:
Measurement
of the values of internal
resistors,
plus internal
weiring.
N.B.
4-wire
Q. verification
must
be completed
before verifying 2-wire
Q.
Routine
for
RSI
Table
6(b).
e.
4708
Press
'Zero'
key.
f.
DMM
i
.
Measure
the resistance
of
the
internal
wiring.
i i
.
Record on
RS
1
Table
6(b) as
'2-Wire
Zero
Value'.
g.
4708
Set
OUTPUT
OFF.
h.
Repeat
(c)
to (g) for
each value of Table
6(b).
j.
Report Sheet
RSI:
a.
4708
i
.
Ensure
that
OUTPUT
is
OFF.
ii.
Select
O.
iii.
Deselect
Remote
Sense.
b.
Connect
the
DMM
as
shown
in
the
above
diagram,
for
a 4-wire
measurement
of
the
internal resistance
between
the
Hi and
Lo
terminals.
c.
4708
i
.
Press required
resistor
(RANGE)
key.
ii
Press
OUTPUT
ON+.
d.
DMM
i
.
Measure
the
value of
the resistance
between
the
Hi and
Lo
terminals,
i
i
.Record
on
RS
1
Table
6(b) as
'2-Wire Value: Om(2)'.
i
.
Enter
the
4-Wire Measured Values
(Om)
from Table
6(a), into their
respective
columns
of Table
6(b), as
'4-
Wire
Value:
Om'.
i
i
.
Calculate
the
2-Wire
-
4-Wire
differences
and
enter
in their
corresponding
columns
of Table
6(b),
opposite
'[Qm(2)
-
Om]'.
The 4708
2-wire Resistance
Values
verify
if
each
Measured
Difference
is
at
or
less
than
its
Limit.
The 4708
2-wire
Zero Values
verify
if
each
Measured
Value
is
at
or
less
than
its
Upper
Limit.
7-28
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