YOKOGAWA FG420, Руководство пользователя

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22 IM FG410-01JA
3. PANELS AND I/O TERMINALS
3.3 Cautions on Floating Ground Connection
The signal ground of the BNC terminals for waveform output, sync/sub-output, and external
modulation/addition input, is shared, but since it is insulated from the housing (ground potential),
it can be connected to equipment that have a different potential. Moreover, the potential has no
influence even when the equipment is mounted in a rack.
In the FG420, the above-mentioned BNC terminals are also insulated between channels.
Further, the signal ground of the external 10 MHz frequency reference input is also insulated from the
housing. Therefore, noise caused by ground-loop is not a problem for connection with a frequency
standard. Nor is noise caused by ground-loop a problem in the case of synchronized connection of
multiple units of the FG410 or FG420.
However, in all cases, the floating voltage should be limited to 42 Vpk (DC+AC peak) or lower to
prevent electric shocks.
The other signal grounds are all connected to the housing. The housing itself is connected to a
protective grounding terminal.
WARNING To prevent electric shocks, do not apply a voltage exceeding 42 Vpk
(DC+AC peak) between the ground of the BNC connectors insulated
from the housing and the housing.
Also, do not apply a voltage exceeding 42 Vpk (DC+AC peak) between
the grounds of the BNC connector groups insulated from the
housing. “BNC connector group,” as used here, refers to multiple BNC
connectors that are connected to a common ground.
If such a voltage were to be applied, the internal voltage limiting
elements will try to curb the working voltage, but if the voltage is too
large, equipment burnout may result.
AVERTISSEMENT
Pour éviter les chocs électriques, n’appliquez pas de tension
supérieure à 42 Vpk (c.c. + c.a. crête) entre la terre des connecteurs
BNC isolés du logement et le logement lui-même.
En outre, n’appliquez pas une tension supérieure à 42 Vpk (c.c. + c.a.
crête) entre les mises à la terre des groupes de connecteurs BNC isolés
du logement. L’expression « groupe de connecteurs BNC » se réfère à
plusieurs connecteurs BNC branchés sur une même mise à la terre.
Si de telles tensions sont appliquées, les composants de limitation de
tension interne tentent de diminuer la tension de fonctionnement.
Mais la tension est trop élevée, l’appareil risque de griller.
CAUTION
If there is a difference in potential between the ground of a BNC
connector insulated from the housing and the housing, do not short
circuit the hot side of that BNC connector and the housing, as this may
damage the equipment.
ATTENTION
En cas de différence de potentiel entre la terre d'un connecteur BNC
isolé du logement et le logement, ne mettez pas en court-circuit le
côté chaud de ce connecteur BNC et du logement : vous risqueriez
d’endommager l’appareil.