Datron 4708 User Handbook Manual page 124

4708
SHUNT
BUFFER
Verification of
4708
Current
Ranges
f
.
Reconnect
the
test circuit for
Verification, using the
appropriate Calibrated Standard Shunt.
g
.
Set
4708
OUTPUT
ON
and note
the
DMM
reading
as
V2.
h. Calculate
V3
as follows:
V3 =
l.OOOOOOV
-f
(V2
-
VI).
Record
V3
as
'Measured Shunt
Voltage'
on RS3.
j
.
Divide
V3
by
the shunt resistance
to
convert
to
Current Record
as 'Calculated Current'
on RS3.
k. Reset
the
4708 Frequency
to
5kHz.
l
.
Repeat
(b) to (k) at
5kHz
(HF).
m.
Repeat
(a) to (I)
for the four other
4708
Current
Ranges on RS3,
using appropriate
shunts.
n
.
Sum
the Verification setup uncertainties
and
record in
the
Us column
of
RS3
as current deviations. (Refer
to
Appendix
2).
Validity
Tolerance Limit
Calculations
Refer
to
Appendix
1
page 7-Al-l
Para
1.
p
•
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.
Each 4708
Current
Full
Range
output verifies
if
the
Current
outputs recorded
in
(j)
are
at
or
between
the
corresponding
Validity Tolerance Limits.
7-A5-3