User manual

UniversitàdegliStudidiCatania
IntroductiontoNILabVIEW
 DAQ:TerminalConfiguration
Thegeneralguideline fordecidingwhichmeasurementsystemto
pickistomeasuregroundedsignalsourceswithadifferentialor
NRSEsystem,andfloatingsourceswithanRSEsystem.
The hazard of using an RSE
system with a grounded signal
source is the introduction of
ground loops, a possible source
of measurement error. Similarly,
using a differential or NRSE
system to measure a floating
source will very likely be
plagued by bias currents, which
cause the input voltage to drift
out of the range of the DAQ
device (although you can
correct this problem by placing
bias resistors from the inputs to
ground).
DIEEI