Datron 1062 - Page 17

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