GEN7iB
334
UNDERSTANDING INPUTS AND USAGE OF PROBES
UNDERSTANDING INPUTS AND USAGE OF PROBES
15
15.1.2 Balanced differential input
A balanced differential input is not isolated and uses balanced inputs.
*1'
8
LQ
±
N
N
±
N
8
LQ±
8
GLII
N
Fig. 15.3 Balanced differential amplier
● Resistance / Capacitance from each terminal to ground is identical
● There is NO ISOLATION
● Used in some of the GEN DAQ acquisition cards
● OftenidentiedbytheuseoftwoMETALBNCconnectorsperchanne
● Can be used with matched pair of probes only
● Works with the same limitations as single probes, but is more tricky due to the
necessary balance between probes
● The probes used need compensation. The compensation range needs to match
theinputamplier'scapacitancerange
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