BRUEL & KJAER System V - THE Cali BRATION HEAD TY PE 4815

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-------
Gau ss
20
~
~
~
15
10
----
-
5
O
O
25
50
75 1
00 mm
Oistance abo ve table mounting surface
O
0 5 1 0
1(5
2(0
2,5 3,0 3,5 4,0
i nc h es
I
1
1
I I I
I
7 4010 7
Ffg. 6. 8. Magnetfc flux de ns it y above table top. Type 4814 with
4801 Body
2 . The upper radial flexure is one piece.
3. There are no magnetic shields on the Mode Study Head . As the Head is generally
coupled to the test object by a pushrod, the i nfluence of the steady state magnetic
field due to the field coils is considerably diminished . The alternating flux is negligi-
ble. As can be seen on the graphs in Figs.6 .8 and 6 .9, the magnetic flux density
100 mm from the table top is small.
4. The mechanical overtravei stops permit a total peak-to-peak travel of at least
25,4 mm (1 ,0 in).
The driver coil is wound with aluminum wire.
Gauss
60
40
30
20
50
-------
r--..
~
O
25
50
75
100 mm
Distan ce above table mounting suriace
O 0,5 1,0
1,5
2,0
2,5 3,0
3,5 4,0
in ch es
I I
I
I I I I
I I
74 0108
Fig. 6. 9 . Magnetic flux density above table top. Type 4814 with
4805 Body
6.3 . THE CALlBRATION HEAD TYPE 4815
Fig.6 . 10 shows an illustration of the Calibration Head Type 4815 with its rubber boot
and protective can removed . A description of its major features follows .
39