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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
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
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