Datron 4708 User Handbook Manual page 97

Stage
4:
To
Verify the
1mV
Range
Full
Range
Output
a
.
Ensure
that the
DMM
is
still
connected
to
the
4708
terminals
as
shown
in
Fig.
2.
b.
Ensure
that the
4708
is
set to the
10m V
Range.
Calculate the value 'V(lOm)
x C.
Set
the
OUTPUT
Display
to this value.
c
.
Set the
DMM
to
measure
Im
V.
d
.
Allow
the output
to
settle.
Note
the
DMM
reading
as
'V(lt)'.
e
.
Set
the
4708
to
its
Im
V
Range.
Adjust
4708
OUTPUTti
keys
to
give a
settled
DMM
reading of
V(lt).
Note
the
4708
OUTPUT
Display
setting as 'V(lm)'.
Record
this setting in the
last
column
of
RSI
table 4(b).
Stage 5
Verification Against Limits
For
Validity Tolerance Limit
Calculations
Refer
to
Appendix
1
page 7-Al-l
para
1.
a.
Sum
the Verification setup uncertainties and
record
in the
Us column
of
RSI
table 2(b) as voltage deviations. (Refer
to
Appendix
2).
b
.
Calculate the
Lower
and Upper
Validity
Tolerance
Limits:
Use
Calculation
A
if the
4708 was
last
calibrated
by
Datron.
Use
Calculation
B
if
the
4708 was
last calibrated against
the standards being used
for
verification.
c
.
Each 4708
mV
Full
Range
is
verified
if
the
4708
OUTPUT
Display
settings
recorded
in
RSI
Table
2(b) are
at
or between
the
corresponding
Validity
Tolerance
Limits.
Calculate
in 5.5
digits
resolution
V(lOm)
X
C =
V(lt)
is
a
transfer
value
V(lt)
=
Record
in
4.5
digits resolution
V(lm) =
7-22