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The Earth / Grounding Concept
General GROUND-LIFT Jumper
Mind the SECURITY INSTRUCTIONS !!
Ex-works this jumper is set to the LIFT position.
The internal ground potential is normally connected to the external earth
reference at this point and is lifted by means of this jumper.
As a result, the interconnection for DC voltages and lower frequencies (<
150 Hz) will be cut. Higher frequencies will be bled off to earth potential
through the RC filter. The LIFT position may be helpful in case of hum or
jitter caused by different ground/earth potentials.
Unfortunately, there is no general recommendation how to solve hum and
jitter problems - or even minimize them. The best way to succeed is to check
different options !! Electrical safety is always ensured, since the earth
conductor is permanently connected to the enclosure !!
XLR GROUD-LIFT Jumper
(accesible from the inside, follow the SECURITY INSTRUCTIONS !! ):
G(ROUND): Ex works all jumpers are set to G(ROUND) position. Pin 1 is
connected to the internal ground reference. High frequency
interferences are deflected to the case via a 100 nF capacitor.
L(IFT):
The interconnection between Pin 1 and ground is open. High
frequency interferences are deflected to the case via a 100 nF
capacitor. This jumper position is useful when the unit is
equipped with transformers !!
C/ASE):
Pin 1 is connected to the case, the 100 nF capacitor is bridged.
This jumper position may be varied together with the General
GROUND-LIFT jumper.
When the ex-work settings are altered, EMC problems might occur,
Theses are in the field of the user´s responsibility !
G108 BDA MAN 08-2023 Fried Reim
(see also page 18, 20, 230)
20
(see also page 18, 20, 30)
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