GEN7iB
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UNDERSTANDING INPUTS AND USAGE OF PROBES
UNDERSTANDING INPUTS AND USAGE OF PROBES15
15 Understanding Inputs and Usage of Probes
15.1 GEN series inputs
Every manufacturer uses different names for similar or even identical types of inputs. Some
of the terminology used is described in this section.
Balanced Vs Unbalanced
A balanced input describes an input stage where both input terminals exhibit the same
electrical behavior, such as resistance and capacitance. Unbalanced electrical input
properties are different.
Symmetrical Vs Unsymmetrical
Symmetrical (similar to balanced) describes the input properties; if both input termi-
nals are built up using the same component in a mirrored way, they are symmetrical
(this will result in a balanced input).
Differential
Adifferentialamplierisatypeofelectronicamplierthatmultipliesthedifference
between two inputs by a constant factor.
Adifferentialamplierisoftentreatedasanisolatedamplier,whichisincorrect.
Single-ended
Asingle-endedamplierisatypeofelectronicamplierthathasthenegativeinput
connected to (measurement) ground.
A differential ampliîž’er can be turned into a single-ended one by connecting the negative
input to ground.
Isolated
Anisolatedamplierisatypeofelectronicamplierwherebothinputsareisolated
from(earth)groundorwhichhasinniteresistancetoground.
Isolation can be combined with any of the ampliîž’er variations mentioned above.
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