YOKOGAWA FG420 - Cautions on Floating Ground Connection

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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.