Fluke 8021B Instruction Manual page 36

Eg =
Source
voltage
Rj_
=
Load
resistance
+
Source
resistance
ly
- Measured
current (display reading
in
mA)
Eg
=
Burden
voltage
(calculated),
i.e.,
Display reading
expressed
as
a
%
of full-scale (100
x
r- )
rUL^bOALt
times full-scale
burden
voltage
for
selected range.
See
Table.
RANGE
MAXIMUM
BURDEN VOLTAGE
2
mA
to
200
mA
0.3V
2000
mA
0.9V
current error
due
to
Burden
Voltage
En
IN
% =
100
X
5
Eg
- E
B
.
—
E
B
x
IN
mA
-
-=
—
E
S
-Eb
Example: Eg
=
14V,
R
L
=
9Q.
ly
=
1497
mA,
1497
E
b
=
100
x^-
x 0.9
(from Table)
=
74.9%
x
0.9
=
0.674V
674
.674
Error
in
%
=
1
00
=
100
=
5.06%
14
-.674
13.326
Increase displayed current by 5.06%
to
obtain true current.
Error
in
mA =
-674 x
1497
_
1009 _
76
mA
14
-
.674 13.326
Increase displayed current by 76
mA
to obtain true current.
Figure 2-12. Current
Measurement
Error Calculations
2-20