Datron 4708 User Handbook Manual page 145

4708
AC
Current
Calibration
(1mA
-
1A)
(Using Thermal
Transfer,
Current Shunts and
DC
Current Standard)
Calibrate the
4708
at
or close
to
the calibration points in the
table,
selecting
SET
as
required
as part
of
the
following proce-
dure:
Calibrate
1mA
Range
only
if
the
Thermal
Transfer
is
adequately
calibrated
at
these levels.
1.
Thermal
Transfer
standard
Configure
for
DC
measurement
at
the
required Cal.
Current
and
connect the appropriate shunt.
2.
DC
Current
Standard
a.
With
OUTPUT
OFF,
connect
across the
Thermal
Transfer
shunt,
and
set to
the required Cal. Current.
b.
Set
OUTPUT
ON.
3.
Thermal Transfer Standard.
Adjust
for null
at
the Cal. Current.
4.
DC
Current Standard
a.
Set
OUTPUT
OFF.
b.
Disconnect from
the shunt.
5.
4708
a.
With
OUTPUT
OFF,
connect the 1+
and
I-
terminals
across the Shunt.
b.
On ACI FUNCTION,
select
the required
OUTPUT
RANGE.
c.
Select the required
FREQUENCY
RANGE.
d.
Use
FREQUENCY
4 1
keys
to
display the required
Cal.
Frequency.
e.
Use
OUTPUT
4 1 keys
to
display the required Cal.
Current
(if at
Nominal
Full
Range, press the Full
Range
key).
f.
Set
4708
OUTPUT
ON
(and
if
NOT
at
Nominal
Full
Range,
Select
SET).
g.
Use
the
OUTPUT
4 1
keys
to
adjust the
OUTPUT
display
reading
to
obtain a
null
on
the
Thermal
Transfer.
h.
Execute
the calibration
by
pressing the
CAL
key. Set
OUTPUT
OFF.
Nominal
Cal. Points for
1mA
to
lA
Ranges.
DC
Standard
OUTPUT
Current
4708
OUTPUT
RANGE/
FREQUENCY
4708
Nominal
OUTPUT
Current
Freq.
band
set
by 4708
1.000000mA
1mA
3(X)Hz
1.000000mA
LF
1.000000mA
ImA
5kHz 1.000000mA
HF
10.00000mA
10mA
300Hz 10.00000mA
LF
10.00000mA
10mA
5kHz 10.00000mA
HF
100.0000mA
100mA 300Hz 100.0000mA
LF
100.0000mA
100mA
5kHz 100.0000mA
HF
1.000000
A
lA 300Hz
1.000000
A
LF
1.000000
A
lA 5kHz
1.000000
A
HF
8-18