GEN7iB
197
INPUT CARDS
INPUT CARDS
12
12.2.7 Understanding the GN310B/GN311B high voltage input
The high voltage signal input channels of the GN310B/GN311B are of the balanced
type. This means that both inputs within one channel pair are exactly the same. The
onlydifferenceisanoppositepolarityorsign.A(simplied)schematicrepresentation
of the input channel can be found below (see Fig. 12.18)
The input channels are of the isolated type. This means that the input channel and
amplierarefullyisolatedfrom(earth)ground.Fullyisolatedinthiscontextmeansa
very high resistance and very small capacitive coupling to ground.
Characteristics per channel:
● The Resistance/Capacitance from each terminal to ground is identical.
● Both terminals have isolated connectors (i.e. isolated from system ground).
● The isolated ground is not externally accessible, as shown in Fig. 12.18.
'LIIHUHQWLDO DPSOLILHU
8
LVR
8
GLII
,1
,1
,VRODWHG
FKDQQHO
1RQLVRODWHG
V\VWHP
N
N
NN
Fig. 12.18 Isolated balanced input channel
(Not) using probes:
Usingpassivevoltageprobestogetherwithbalancedisolatedinputsisverydicult
and not recommended. The main reason for this is that there is no ground reference for
the probe to divide the input voltage.
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