HBM SK12, Инструкция по монтажу, Страница: 41 / 48

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SK5, SK6, SK12
HBM A0842-2.0 de/en
26.1 Hints for measurements
In the case of strain gauge measurements the full bridge is recommended be-
cause the influence from the slipring transmission will have a much smaller eff
ect than with half or quarter bridges. For high precision measurements the
700 Ω full bridge is preferred but also with 350 Ω or 120 Ω full, half, or quarter
bridges the errors will be relatively small.
26.2 Mass or earth connection
On the slipring body SK5 the lipring with the slightly smaller diameter is con-
nected to the mass of the slipring body thus enabling proper earthing of the
rotor part. This slipring is associated with the yellow connection when moun-
ting the brush holder.
lf the operating voltage zero
( )
of the amplifier shall also be connected to
machine earth the cable screen shall be connected with the yellow connection
of the brushe holder. No other earth connection shall be made in order to
avoid earth loops (see fig. 11. 1).
Fig. 11.1: Slipring assembly SK5, circuit diagram with earth connection