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-------
-------
Gauss
20
~
~
~
15
10
---
-
5
O
O
25
50
75
100
mm
Oistance
abo ve table mount
ing surface
O
0 5
1 0
1(5
2(0
2,5
3,0
3,5
4,0
inches
I
1
1
I
I
I
I
740107
Ffg. 6. 8. Magnetfc flux de nsit 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
Distance
abo
ve table mounting suriace
O
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
inches
I
I
I
I
I
I
I
I
I
740108
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
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