Fluke 8024B - Page 45

8024B
IM }
Es
Es = Source voltage
R,_ = Load resistance + Source resistance
Im = Measured current (display reading in mA)
ER = Burden voltage (calculated), i.e., Display reading
‘
:
_READING
_
expressed
as
a
%
of
full-scale
(100x
=>
—eaar¢
)
times full-scale burden voltage for selected range. See
MAXIMUM
BURDEN VOLTAGE
2 mA to 200 mA
2000 mA
current error due to Burden Voltage
EB
IN % =S4100.0)c2 2
Es-Ep
Ep x In
IN mA Es -Ep
Example: Eg = 14V, Ry = 99, IM= 1497 mA,
2 Jae =
ER = 100 X>000 * 0.9 (from Table)
74.9% or 0.9 = 0.674V
674
; .674
Error in % = 100 ————— = 100 = 5.06%
14- .674 13.326
Increase displayed current by 5.06% to obtain true current.
Error in mA: = 874 x 1497 = 1009 — 76MA
14 - .674 13.326
Increase displayed current by 76 mA to obtain true current.
Figure 2-17. Current Measurement Calculations
2-28