Abstract
A parameterization aid for parameterizing applied strain gages includes a handle having a front end, a head piece arranged at the front end of the handle and including a contact surface formed with two fixing grooves for receiving two strain gage connection wires, a movable magnetic field barrier designed to avoid interference into further strain gage connection wires, and a transmitting device designed to transmit parameterization signals to the strain gage connection wires, which lie in the fixing grooves.
Claims
1.-4. (canceled)
5. A parameterization aid for parameterizing applied strain gages, the parameterization aid comprising: a handle having a front end; a head piece arranged at the front end of the handle and including a contact surface formed with two fixing grooves for receiving two strain gage connection wires; a movable magnetic field barrier designed to avoid interference into further strain gage connection wires; and a transmitting device designed to transmit parameterization signals to the strain gage connection wires, which lie in the fixing grooves.
6. The parameterization aid of claim 5, wherein the magnetic field barrier is removable.
7. The parameterization aid of claim 5, wherein the contact surface, with the exception of a surface of the two fixing grooves, is provided with a soft-elastic plastic or rubber layer which is at most 0.7 mm thick.
8. The parameterization aid of claim 5, wherein the head piece is separable from the handle.
Description
[0022] The invention is described in more detail hereinafter with reference to schematic drawings:
[0023] FIG. 1 shows a perspective view of the parameterization device.
[0024] FIG. 2 shows an operating state in which the parameterization aid is placed on two outer strain gage connection wires.
[0025] FIG. 3 shows the operating state depicted in FIG. 2, but the magnetic field barrier is pivoted into the closed position.
[0026] FIG. 4a shows the side view of the head piece with the transmitting device being assigned to the strain gage connection lines.
[0027] FIG. 4b shows the end face view of FIG. 4a, without magnetic field barrier.
[0028] FIG. 5 shows an operating state in which the parameterization device is placed on two internal strain gage connection wires.
[0029] FIG. 6 shows the operating state of FIG. 5, in which the magnetic field barrier is in the closed position.
[0030] FIGS. 7a, b show strain gages according to the prior art.
LIST OF REFERENCE SIGNS
[0031] 1handle [0032] 2head piece [0033] 3contact surface [0034] 4fixing grooves [0035] 5magnetic field barrier [0036] 6pivot point [0037] 7a connection cable [0038] 8strain gage connection wires [0039] 9strain gage carrier film [0040] 10solder points [0041] 11transmitting device
[0042] FIG. 1 shows a perspective view of the parameterization device. The handle 1 has at its upper end a connection cable 7, via which the parameterization signals are fed to the transmitting device 11. The head piece 2 shown on an enlarged scale has two semi-circular fixing grooves 4 into which the strain gage connection wires 8 are pressed. I.e., the distance between the two fixing grooves 4 is dimensioned such that the respective pair of strain gage connection wires 8 lies in the fixing grooves. A thin metal sheet of a material with high magnetic permeability, like, e.g., mu-metal, is formed as a magnetic field barrier 5. This magnetic field barrier 5 is movably attached to the head piece 2 at a pivot point 6 and is preferably pivotable.
[0043] FIG. 2 shows an operating state in which the parameterization aid is placed on two outer strain gage connection wires 8. In order to avoid magnetic interference into the 4 other strain gage connection wires 8, the magnetic field barrier 5 is guided under the two outer strain gage connection wires.
[0044] FIG. 3 shows the operating state depicted in FIG. 2, but now with the magnetic field barrier 5 pivoted into the closed position to prevent magnetic interference into the connection wires 8 of the other two strain gages.
[0045] FIG. 4a shows the side view of the head piece 2 with the schematically depicted transmitting device 11 for transmitting the parameterization signals. The . . . transmitting device 11 is a ferrite core with a current-carrying coll. The end portions of the legs of the ferrite core are therefore always directed exactly towards the two connection wires 8 of the respective strain gage. Moreover, the starting position and the closed position of the magnetic field barrier 5 are also illustrated. Depending on the embodiment of the ferrite core, there may also be three legs.
[0046] FIG. 4b shows the end face view of FIG. 4a, but without the magnetic field barrier 5.
[0047] FIG. 5 shows an operating state in which the parameterization device is placed on two inner strain gage connection wires 8. As the magnetic field barrier 5 is a thin, elastically deformable metal sheet, it can be pushed under the strain gage connection wires 8 even in confined spaces. In particularly tight conditions, the magnetic field barrier 5 may also be removed from the pivot point 6 and pushed separately by hand under the strain gage connection wires 8.
[0048] FIG. 6 shows an operating state from FIG. 5, in which the magnetic field barrier 5 is almost in the closed position.
[0049] FIGS. 7a, 7b show strain gages from the prior art. The meandering strain gages of a very thin metal foil are bonded to a plastic carrier film 9. In particular, the strain gages lying above one another in FIG. 7a have the strain gage connection wires lying particularly close together, which can be parametrized safely and easily with the aid of the parameterization aid according to the invention.
[0050] In order to prevent damage to the strain gage connection wires 8, the soldering points 10 and in particular to the sensitive strain gages, the contact surface 3 of the head piece 2 can be designed to be soft and elastic, e.g. by means of a 0.5 mm thick rubber layer.
[0051] Furthermore, it is possible to make the head piece 2 separable from the handle 1. This is useful when different head pieces are to be used for special applications, e.g. applications are also conceivable in which the connection wires are further apart.
