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DC
Current
Verification
Procedure
Record
results
on Report
Sheet
4708
RS
1,
(Page
7-33).
Full
Range Checks
(100|iA
-
1A)
N.B.
Values
in
square brackets
[ ... ]
apply
when
the
DMM
is
to
be
standardized
for the
1
A
Range
at
100mA,
using
the preferred transfer
shunt value of
0.
Ifi.
Standardize
the
DMM
at
IV
[lOOmV]:
Ensure
that
the
4708
has already
been
verified
on
its
IV
and
lOOmV
ranges.
Ensure
that the
DMM
has
been
recently
calibrated,
or
that
its
zero-offsets
have been removed, and
its
polarity
turnover
at
IV
[lOOmV]
is
verified as accurate.
Standardize
the
DMM
before verifying
the
ranges
in
the
sequence of
RS
1
Table
2;
a.
4708
Set
OUTPUT
OFF,
FUNCTION
to
DC,
OUTPUT RANGE
to
1
[100m],
Sense and
Guard
to
Remote.
OUTPUT
Display
to
+ 1.0000000
V
[+100.00000mV]
b
.
Connect
the
DMM
to
read
the
4708
output
for
standardization
(no
shunt).
Observe
the correct
DMM
Guard
selections.
c.
DMM
Set
to
measure
IV
[lOOmV] DC.
d.
4708
Set
OUTPUT
ON.
e.
DMM
Note
the
reading
as
'+vr.
f.
4708
Set
OUTPUT
OFF.
g
.
Disconnect
the
4708
from
the
DMM.
7-9
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