Dc Current - Datron 1062 Service Handbook

1.5
DC CURRENT
CALIBRATION
(No
DC
Current
facility
if
Option 12
is
fitted)
8
1.5.1
General
The
procedure
in
the
table
below shows
all
that
is
necessary to
completely
'AUTOCAL'
the
DC
Current
function.
If
just the
DC
Current or
just
one
range of
DC
Current
is
to
be calibrated,
then
step 11 to
14 of the
DC
Voltage Calibration table
should be
carried
out
first.
Then on
each
DC
Current range just a 'Zero'
and 'Gain'
calibration
is
required.
If
the
'DVM
Reading After Calibration'
is
not
in
accordance with the table
then repeat operation of the
same
'CALIBRATE'
key
is
permissible to
improve
the
reading.
Where no
tolerance
is
shown
in
this
column, only
the exact reading
quoted with an occasional
least
significant
digit
showing
is
to be expected.
1.5.2
Equipment Required
A DC
Current calibration source,
e.g.
Datron 4000/
4000A
Autocal Standard with Option
20.
1.5.3
Checking Accuracy after
'AUTOCAL'
To check
the
accuracy
after
'AUTOCAL'
the 'Speci-
fication Verification' section
of the Operating
Handbook
will
be useful.
It
provides tables for
quick
reference of
accuracy
on
all
ranges
and
functions
in
displayed digits.
DC
CURRENT CALIBRATION TABLE
Step
Calibration
Operation
Calibration
Source
Output
DVM
Setting
'CALIBRATE'
Key
DVM
Reading
After
Calibration
Remarks
1
.1mA
Range
Zero
O.OOOjuA DC,I,.1
'Zero'
±0.000)iA
±1
digit
Do
not
select
'Input
filter'
2
.1mA
Full
Range
-MOO.OOOmA
DC,I,.1
'Gain'
-MOO.OOOmA
±2
digits
3
1mA
Range
Zero
O.OOOOOmA
DC,I,1 'Zero'
±.
00000m
A
±1
digit
4
1mA
Full
Range
-M.OOOOOmA
DC,I,1 'Gain'
H
.00000mA
±2
digits
5
10mA
Range
Zero
O.OOOOmA
DC,1,10 'Zero'
±0.(K)00mA
±1
digit
6
10mA
Full
Range
-MO.OOOOmA
DC
,1,10
'Gain'
-H
O.OOOOmA
7
100mA
Range
Zero
O.OOOmA Dc;,ioo
'Zero'
±0.
000m
A
8
100mA
Full
Range
-I-
100.000mA
DCJ[,100 'Gain' -1-1
00.000mA
9
1000mA
Range Zero
0.00mA DC,
1,
1000
'Zero'
iO.OOmA
1
10
1000mA
Full
Range
-n
000.00mA
DC,I,1000
'Gain'
+
1000.00mA