RIGOL DM3068 - Manual (Page 142)

RIGOL Chapter 5 Measurement Tutorial
User’s Guide for DM3068 5-2
Loading Errors (DCV)
Measurement loading errors occur when the resistance of the device-under-test
(DUT) takes up a certain percentage in the multimeter’s own input resistance. The
diagram below shows this error source.
HI
LO
Rs
Vs Ri
Ideal
Meter
Vs = ideal DUT voltage
Rs = DUT source resistance
Ri = input resistance of the multimeter (10 MΩ or >10 GΩ)
Error (%) =
i R s R
s R 100
+
×
To reduce the effect of loading errors and noise interference, you can set the input
resistance of the multimeter to “>10GΩ” for 200 mV, 2 V and 20 V ranges, and
“10MΩ” for the 200 V and 1000 V ranges.