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V
test
U2741A User's Guide
R
L
HI
R
L
LO
V
ground
Figure 3-2 Ground loop induced error
The best way to eliminate ground loops is to isolate the
digital multimeter from earth by not grounding the input
terminals. If the digital multimeter must be earth- referenced,
connect it and the device under test to the same common
ground point. Also connect the digital multimeter and device
under test to the same electrical outlet whenever possible.
Measurement Tutorial
R
= Lead Resistance
L
R
= digital multimeter Isolation
i
Resistance
Ideal
V
= Voltage Drop or Ground Bus
ground
Meter
R
> 10GΩ
i
3
51
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