Ext Ernal Dimensions - BRUEL & KJAER System V Instruction Manual

-
- - -
_1 / (100 _ Ta) 8,07
PA
{Exciter Heads 481 2 and 4813)
22\1
PSL
1
J
PA
- (100 - Ta) 6,67 -
(Exciter Heads 4811 and 4814)
20
PSL
where P
A
= ambient airdensity
PSL
=
air density at sea level
2. Dynamic rated force is reduced jf the mains voltage is -5% to -15% of nominal.
3. At frequencies above 150 Hz the dynamic rated force is reduced by 2,5% if half of
the available static force is used and is reduced by 10% if the full static force is
used. At frequencies below 150 Hz the dynamic rated force is reduced by 15% if
half of the available static force is used and is reduced by 30% if the full static force
is used .
4. The system V exciters will normally be opera t ed by Power Amplifier Type 2707
rated at 220 VA. To attain higher performance characteristics the exciter may be in ­
termittently driven by Power Amplifier Type 2708, rated 1200 VA. This permits a
higher dynamic range to be achieved with, for example, random signals. However,
the maximum RMS ratings (e.g. current) must not be exceeded. The 480 1 and
2708 are fully compatible with respect to supply and interlock connections.
9.5. EXTE RNAl DIM EN SIONS
The externai dimensions of the 4801 T and 4801
S
are given in Figs.9.1 and 9. 2 respec ­
tively.
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