Multicomp-pro
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4. Measurement Tutorial
Loading Errors (DC Voltage)
Measurement loading errors occur when the resistance of the DUT(Device-Under-Test) is
an appreciable percentage of the multimeter's input resistance, as shown below.
V
s
= ideal DUT voltage
R
s
= DUT source resistance
R
i
= multimeter input resistance
Error
i
s
s
100 R
( )
R
R
%
×
=
+
For the mV range, input impedance
≥
5 MΩ
. For other range, input impedance
≥
10 MΩ.
HI
LO
Ideal
Meter
R
s
V
s
R
i
