Loading Errors Due to Input Resistance (dc volts)
Measurement loading errors occur when the resistance of the device-
under-test (
DUT) is an appreciable percentage of the meter’s own input
resistance. The diagram below shows this error source.
V
s
=
Ideal
DUT
voltage
R
S
=
DUT
source
resistance
R
i
=
Meter
input
resistance
(10 MΩ or > 10 GΩ )
Error
(%) =
100
x
R
S
R
S
+
R
i
Ideal
Meter
7
Chapter 7 Measurement Tutorial
Measurement Techniques and Sources of Error
255
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