26
z
Fix one end of the demagnetized magnetic tape strip with a magnetic clamp (Figure 9,
pos . 2) .
z
Put MT upon the prepared vehicle number platform and fix MT end on the examined
surface using a magnetic clamp (avoid warps and shifts relative to the number
examined) . For plastic MT: put the MT with its working surface (of brown colour) facing
down (facing the examined surface) .
z
Similarly fix the other end of the magnetic tape with a magnetic clamp (see Figure 9) .
z
Fixing magnetic tape on the investigated surface can also be done manually – without
using magnetic clamps .
z
Select the concentrator of the Combination Magnetic Scanner and a handle according to
the properties of the investigated object .
CMS concentrators can be positioned (screwed) on one of the two handles: on CMS handle
(Figure 8, pos . 1) or on the universal handle with hinge (Figure 9b, pos . 5) . The latter is used for
inspecting hard-to-reach areas and it ensures rotation and inclination of the scanner head; besides,
it can be extended with the help of extension handles (Figure 9b, pos . 6) . Example of magnetic
copying for the vehicle number platform, located in a hard to reach place is shown in Figure 9b .
z
Make a magnetic copy . Lower the concentrator of the magnetic scanner unto the fixed
magnetic tape strip and, slightly pressing it down, move it from the beginning to the end
of the investigated area (see Figure 9a) . Operator should visually and tacitly control the
perpendicularity of flat scanner in relation to the researched surface to receive magnetic
copy of good quality . Rotary and compact scanners firmly adjoin to the researched surface
because of magnets gravitation . In case copying conditions were not followed (magnetic
tape shift, lack of contact of the scanner), all operations should be repeated starting from
magnetic tape demagnetizing .
z
Remove magnetic tape with copy from the investigated object and disconnect the magnetic
clamps . Avoid contact of magnetic clamps and scanner with the magnetic tape surface .
Otherwise, the magnetic tape can be partly demagnetized or it can receive appearance
of unnecessary magnetization elements (blemishes or strips unrelated to the investigated
object) which can obstruct the subsequent investigations .
Magnetic Copying
Figure 8
Magnetic tapes inspection and maintenance
1 — demagnetizer drive button
2 — frame-handle
3 — rotary concentrator plug
4 — rotary concentrator
5 — flat concentrator
6 — MT strip
7 — rotary concentrator screw
5
6
7
2
3
4
1
Summary of Contents for 7505M
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