DE202017001659U1 - Measuring adapter and measuring adapter system with such a measuring adapter - Google Patents

Abstract

Measuring adapter (2) for connecting an electrically to be measured electrical connection with a measuring device (4), wherein the measuring adapter (2) has a first electrical measuring adapter connection (5) for electrical connection to the electrical connection, a second electrical measuring adapter connection (6) for electrical connection with the measuring device (4), a circuit (7) for electrically connecting the first electrical measuring adapter connection (5) to the second electrical measuring adapter connection (6), and a housing (8) for holding the first electrical measuring adapter connection (5), the second electrical Measuring adapter connection (6) and the circuit (7).

Description

The invention relates to a measuring adapter for connecting an electrical connection to be measured electrically to a measuring device and to a measuring adapter system having such a measuring adapter.

In the case of electrical systems, machines and other equipment, electrical measurements are carried out for reasons of occupational safety. For this purpose, all essential measuring points from the device to be measured are performed on an electrical connection. The electrical connection is then connected to the measuring device by means of measuring tips, crocodile clips and / or cables, the so-called measuring devices. Due to the possible high currents and voltages extreme caution is required when using the meter.

The internal resistance of the measuring equipment influences the measurement result. Modern measuring devices therefore offer a compensation function in which the internal resistances of the measuring devices are taken into account. However, the measuring means used are not stable connection systems, i. H. no connection systems with a stable mechanical structure. Accordingly, accurate compensation at a high repetition rate of measurements is not ensured in these connection systems.

The invention has for its object to provide a measuring adapter, in which an accurate compensation of the internal resistance is ensured even at a high repetition frequency of measurements or plug-in operations for the measurements and which is safe to use for the user. It is also an object of the invention to provide a measuring adapter system with such a measuring adapter, wherein the measuring adapter and the entire measuring structure can be calibrated quickly and easily.

This object is achieved by a measuring adapter according to claim 1. A measuring adapter system with such a measuring adapter is described in claim 7. Advantageous embodiments of the invention are specified in the subclaims.

Accordingly, a measuring adapter for connecting an electrical connection to be measured electrically with a measuring device is provided. The measuring adapter has a first electrical measuring adapter connection for electrical connection to the electrical connection, a second electrical measuring adapter connection for electrical connection to the measuring device, a circuit for electrically connecting the first electrical measuring adapter connection to the second electrical measuring adapter connection, and a housing for holding the first electrical measuring adapter connection , the second electrical adapter connection and the circuit.

The fact that the first electrical measuring adapter connection, the second electrical measuring adapter connection and the circuit are held by the housing, the measuring adapter has a stable construction. Accordingly, the relative position of the individual components of the measuring adapter to each other does not change. This has the advantage that the internal resistance of the measuring adapter needs to be determined only once, because it does not change. Thereafter, it is not necessary for the individual measurements, for example with high repetition frequency of a plug-in operation between the first electrical measuring adapter connection and various electrical connections to be measured, to re-determine the internal resistance with each measurement. The user can therefore make accurate measurements by means of the measuring adapter in the sense of measuring technology.

Next can be increased by the stable design of the measuring adapter, the work safety for a user. The user can grasp the measuring adapter on the housing. The housing may comprise a plastic. In particular, the housing may comprise polyethylene. The user is then far away with his hands and electrically isolated from the current-carrying components. A handling of the user with measuring tips and / or crocodile clips for the electrical connection to the electrical connection to be measured electrically can be omitted. The user can therefore carry out safe measurements by means of the measuring adapter in the sense of occupational safety.

According to one embodiment of the measuring adapter, the first electrical measuring adapter connection has a CEE connector with a plurality of pins, in particular three, four or five pins. Advantageously, the measuring adapter can then be connected to a CEE socket, which represents the electrical connection.

CEE stands for "Commission on the Rules for the Approval of the Electrical Equipment" or in German "International Commission for the regulation of the approval of electrical equipment".

The CEE connector can be a plug to " IEC 60309 " (earlier IEC 309 and CEE 17). IEC stands for "International Electrotechnical Commission".

In particular, the CEE connector may have 3 to 5 pins. In this case, a pin with the neutral conductor, a pin with the protective conductor and 1 to 3 pins are each connected to a phase conductor.

According to another embodiment of the measuring adapter, the pins form three phase conductor pins, a neutral pin and a protective conductor pin. As a result, the electrical connection to be measured electrically can have three phase conductors.

According to a further embodiment of the measuring adapter, the second electrical measuring adapter connection to a Schuko extension socket. Accordingly, a Schuko plug can be used to connect the measuring adapter to a measuring device. In particular, a neutral conductor, a protective conductor and a phase conductor are connected to the measuring device. The name Schuko stands for "protection contact".

According to a further embodiment of the measuring adapter, the second electrical measuring adapter connection has a plurality of safety measuring sockets. By means of the safety measuring sockets, it is possible to connect a neutral conductor, a protective conductor and / or different phase conductors to the measuring instrument.

The second electrical measuring adapter connection of the measuring adapter can have both a Schuko socket and safety measuring sockets. It is possible that the Schuko socket and the safety measuring sockets are arranged on two different sides of the housing of the measuring adapter.

According to a further embodiment of the measuring adapter, the circuit electrically connects each safety measuring socket with one pin each of the CEE plug connector. Advantageously, individual measurements can then be carried out with each phase conductor.

According to a further embodiment of the measuring adapter, the circuit has a measuring point switch for switching an electrical connection between a safety measuring socket and various pins of the CEE mounting plug. This has the advantage that different phase conductors can be electrically connected to the measuring device by means of a safety measuring socket depending on the position of the measuring point switch. A plugging of a cable between different safety measuring sockets can then be omitted if different phase conductors are to be electrically connected to the measuring device.

Furthermore, a measuring adapter system with a measuring adapter, as described, and a calibration adapter for mounting on the first electrical measuring adapter connection for calibrating the measuring adapter are provided. The calibration adapter shorts several pins together. In particular, three pins can be short-circuited to each other, namely the pins which would be connected in the actual measurement with the neutral conductor, with the protective conductor and with a phase conductor. The phase conductor may in particular be the first phase conductor.

By means of short-circuiting the pins of the first electrical measuring adapter connection, the internal resistance of the measuring adapter can be determined by means of the measuring device. In this case, the internal resistance of the electrical connection, d. H. the electrical line, from the second electrical Meßadapteranschluss to the meter also considered.

Alternatively, more than three pins can be short-circuited by means of the calibration adapter.

For the switching contacts of the measuring point switch a higher internal resistance is to be expected. Due to the wear and aging of the switching contacts, the internal resistance is then a variable size. By using the calibration adapter, this variable influencing the measurement accuracy can be compensated.

According to one embodiment of the measuring adapter system, the calibration adapter has a short-circuit bridge for electrically short-circuiting at least two of the pins of the first electrical adapter connection. In this case, the shorting bridge may comprise a metal, in particular brass. Further, the shorting bridge has at least as many contact holes as contacts, d. H. Pins, the first electrical adapter connection to be shorted.

It is possible, if the internal resistance during short-circuiting of a neutral conductor, a protective conductor and a phase conductor is measured to close the internal resistance in other possible existing phase conductors.

According to a further embodiment of the measuring adapter system, the calibration adapter has a grip element, which is designed such that an electrical connection of the measuring adapter to the electrical connection is mechanically blocked when the calibration adapter is attached. Advantageously, it can thus be avoided that the electrical system to be measured, the machine to be measured or the other equipment to be measured is short-circuited.

The gripping element may comprise a plastic, in particular polyethylene. Furthermore, the gripping element can have at least one guide bore for receiving a contact, ie pins, of the first electrical measuring adapter connection.

According to a further embodiment of the measuring adapter system, the calibration adapter has at least one spring, which is arranged between the shorting bridge and the grip element. The spring serves to increase the mechanical flexibility of the calibration adapter and / or to ensure the highest possible bearing surface of the shorting bridge with the pins via the spring pressure. By means of the flexibility of the at least one spring, the calibration adapter can simply be pushed onto the first electrical measuring adapter connection of the measuring adapter. In particular, the calibration adapter can also have two springs.

The embodiments and features described for the proposed measuring adapter apply correspondingly to the proposed measuring adapter system.

Further possible implementations of the invention also include not explicitly mentioned combinations of features described above or below. The skilled person will also add individual aspects as improvements or additions to the respective basic form of the invention.

The invention will be explained in more detail below with reference to the drawings. These show in

1 a schematic and partial perspective view of a measuring adapter system with a measuring adapter and a calibration adapter and a measuring device,

2 a schematic view of a circuit,

3 a perspective view of the in 1 only schematically illustrated calibration adapters,

4 a plan view of the calibration from 3 , and

5 a view from the bottom of the calibration adapter 3 ,

In the figures, identical or functionally identical elements have been given the same reference numerals. It should also be noted that the illustrations in the figures are not necessarily to scale.

1 shows a schematic and partial perspective view of a measuring adapter system 1 with a measuring adapter 2 and a calibration adapter 3 , Next is a meter 4 shown schematically.

The measuring adapter 2 has a first electrical adapter connection 5 , a second electrical adapter connection 6 and a circuit 7 (shown schematically in FIG 2 ), and a housing 8th on. The housing 8th serves as a framework for holding the first electrical measuring adapter connection 5 , the second electrical adapter connection 6 and the circuit 7 , In this case, the housing shown 8th a basic body 9 and a lid 10 on. The main body 9 is made of solid material and is milled out. For stability and protection reasons, the housing 8th only from the main body 9 and the lid 10 consist. The circuit 7 serves for the electrical connection of the first electrical measuring adapter connection 5 with the second electrical measuring adapter connection 6 ,

The first electrical adapter connection 5 is a CEE connector 11 educated. The illustrated CEE has connectors 11 five pins 12 on. The CEE connector 11 can with an electrical connection (in 1 not shown) are connected to an electrical system. This is a pin 12 with neutral N, one pin 12 with the protective conductor PE, a pin 12 with the first phase conductor L1, a pin 12 with the second phase conductor L2 and a pin 12 electrically connected to the third phase conductor L3. Alternatively, the CEE connector 11 also a different number of pins 12 exhibit. For example, the CEE connector has only three or four pins 12 when the electrical connection has only one or two phase conductors.

The second electrical adapter connection 6 used for electrical connection with the meter 4 , For this purpose, the second electrical measuring adapter connection 6 a Schuko extension socket 13 and several safety test sockets 14 on. The measuring adapter 2 is therefore about the Schuko extension socket 13 and / or via the safety measuring sockets 14 with the meter 4 electrically connectable. Alternatively, the measuring adapter 2 but only the Schuko extension socket 13 or the safety measuring sockets 14 exhibit.

The Schuko extension socket 13 is over a Schuko plug 15 with the meter 4 electrically connectable. In contrast, the safety measuring sockets 14 via individual cables 16 with the meter 4 electrically connectable.

The calibration adapter 3 of the measuring adapter system 1 is in 1 only shown schematically. By means of the calibration adapter 3 be different pins 12 For example, the neutral conductor N, the protective conductor PE and the first phase conductor L1, shorted when the calibration adapter 3 on the CEE connector 11 is attached. With attached calibration adapter 3 can by means of the measuring device 4 the internal resistance of the measuring adapter 2 measured and the measuring adapter 2 be calibrated with it.

2 shows a schematic view of the circuit 7 , Of the five pins 12 of the CEE connector 11 are the neutral conductor N, the protective conductor PE and the phase conductor L1 with the corresponding contacts of the Schuko extension socket 13 connected. Next is every pin 12 of the CEE connector 11 each with a safety measuring socket 14 electrically connected. Accordingly, stand by means of safety measuring sockets 14 all five conductors, ie neutral conductor N, protective conductor PE, first phase conductor L1, second phase conductor L2 and third phase conductor L3, for measurement by means of the measuring device 4 to disposal.

Alternatively, the circuit 7 also have a measuring point switch (in 2 Not shown). By means of the measuring point switch, a safety measuring socket can be provided 14 depending on the position of the measuring point switch with the phase conductor 1 , with the phase conductor 2 or with the phase conductor 3 be electrically connected. This eliminates the need for a cable 16 from a safety test socket 14 into another safety test socket 14 plug over if another phase conductor with the meter 4 to be electrically connected.

3 shows a perspective view of the in 1 only schematically illustrated calibration adapter 3 , The calibration adapter 3 has a shorting bridge 17 and a handle element 18 on. The shorting bridge 17 is made of metal, especially brass, designed around three pins 12 of the CEE connector 11 short-circuit. For this purpose, the calibration adapter 3 so on the CEE connector 11 plugged that three of the pins 12 in holes 19 the shorting bridge 17 are introduced to the shorting bridge 17 to contact electrically. In this way, a phase conductor L1, a neutral conductor N and a protective conductor PE is short-circuited.

Alternatively, the shorting bridge 17 also any other number of holes 19 have a corresponding number of pins 12 of the CEE connector 11 short-circuit.

The grip element 18 is made of plastic, in particular polyethylene. Accordingly, the grip element 18 an electrical insulator. Next, the handle element 18 be milled from a solid material. This in 3 illustrated grip element 18 has a handle element main body 20 and a handle element head 21 on. In this case, the handle element 18 be formed integrally. The handle element main body 20 has a partially cylindrical shape to attach to the CEE connector 11 to be put together. In contrast, the handle element head 21 about the diameter of the CEE connector 11 protrude.

The handle element main body 20 In addition, at least one guide hole 27 to attach the calibration adapter 3 on the measuring adapter 2 to facilitate. The at least one guide bore 27 additionally supports the parallel positioning of the calibration adapter 3 and thus represents together with that of feathers 26 contact pressure produced a good electrical contact with the pins 12 her (see 4 and 5 ).

By means of the grip element 18 may be an accidental mechanical mating of the electrical connection of the device to be measured and the measuring adapter 2 be prevented if multiple pins 12 of the CEE connector 11 by means of the shorting bridge 17 are shorted. As a result, a short circuit of the device to be measured is reliably prevented.

The shorting bridge 17 is by means of two fasteners 22 from the handle element 18 held. These are the fasteners 22 firmly with the handle element main body 20 mechanically connected. Here are the fasteners 22 at a right angle from a surface of the handle element main body 20 off, and are on two different sides of the shorting bridge 17 arranged. To the breakage of the fasteners 22 To improve, the fasteners 22 be provided in the base area with radii, ie at the transition between the fasteners 22 and the handle element main body 20 there are no edges. In particular, the fasteners 22 , the handle element body 20 and / or the gripping element head 21 be formed integrally.

Next have the fasteners 22 one oval opening each 24 on. In the oval openings 24 is a pen 25 (please refer 4 ), which in turn is fixed to the shorting bridge 17 mechanically connected. The axis of the pen 25 runs parallel to the axes of the holes 19 , The pencil 25 can be made of metal or plastic. Next, the pen can 25 in the oval openings 24 move so that also the shorting bridge 17 relative to the handle element 18 can move. It is possible that pen 25 and shorting bridge 17 are integrally formed.

This in 3 illustrated grip element 18 has an edge 28 between the handle element main body 20 and the handle element head 21 on. Alternatively, Griffelementgrundkörper 20 and handle element head 21 even without this edge, or without such edges, merge into each other. In this case, the handle element 18 at the transition between the handle element main body 20 and the handle element head 21 at least partially flush.

4 shows a plan view of the calibration adapter 3 out 3 , As in 4 shown, the calibration adapter 3 two more springs 26 on. The feathers 26 are between the shorting bridge 17 and the handle element main body 20 arranged. The axes of the springs run 26 perpendicular to the axis of the pen 25 ,

By means of the springs 26 and the pen 25 is the shorting bridge 17 mechanically flexible and yet in a preferred relative position to the handle element 18 arranged. The flexibility allows easy attachment of the calibration adapter 3 on the CEE connector 11 , Next put the springs 26 by their contact pressure ensure that a good electrical connection between the shorting bridge 17 and the pins 12 is built.

5 shows a view from the bottom of the calibration adapter 3 out 3 , The handle element main body 20 has two guide holes 27 on. The guide holes 27 can each have a pin 12 so that the calibration adapter 3 parallel to the pins 12 on the CEE connector 11 can be plugged, since all pins 12 in holes 19 or guide holes 27 can be included.

The guide holes 27 especially serve as an auxiliary guide when attaching the calibration adapter 3 on the CEE connector 11 to tilt the calibration adapter 3 to prevent. The thus enforced parallel guidance to the pins 12 interacts with the springs 26 a large and therefore good electrical connection between the pins 12 and the shorting bridge 17 for sure.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• IEC 60309 [0011]
• IEC 309 [0011]

Claims (11)

Measuring adapter ( 2 ) for connecting an electrical to be measured electrical connection with a measuring device ( 4 ), whereby the measuring adapter ( 2 ) a first electrical measuring adapter connection ( 5 ) for electrical connection to the electrical connection, a second electrical measuring adapter connection ( 6 ) for electrical connection with the measuring device ( 4 ), a circuit ( 7 ) for electrically connecting the first electrical measuring adapter connection ( 5 ) with the second electrical measuring adapter connection ( 6 ), and a housing ( 8th ) for holding the first electrical measuring adapter connection ( 5 ), of the second electrical measuring adapter connection ( 6 ) and the circuit ( 7 ) having. Measuring adapter according to claim 1, wherein the first electrical measuring adapter connection ( 5 ) a CEE connector ( 11 ) with several pins ( 12 ), in particular three, four or five pins ( 12 ), having. Measuring adapter according to claim 2, wherein the pins ( 12 ) form three phase conductor pins (L1, L2, L3), a neutral pin (N) and a protective conductor pin (PE). Measuring adapter according to claim 1, 2 or 3, wherein the second electrical measuring adapter connection ( 6 ) a Schuko extension socket ( 13 ) having. Measuring adapter according to one of the preceding claims, wherein the second electrical measuring adapter connection ( 6 ) several safety measuring sockets ( 14 ) having. Measuring adapter according to claim 5 as far as dependent on claim 2, wherein the circuit ( 7 ) each safety measuring socket ( 14 ) with one pin ( 12 ) of the CEE connector ( 11 ) electrically connects. Measuring adapter according to claim 5 as far as dependent on claim 2, wherein the circuit ( 7 ) a measuring point switch for switching an electrical connection between a safety measuring socket ( 14 ) and different pins ( 12 ) of the CEE connector ( 11 ) having. Measuring adapter system ( 1 ) with a measuring adapter ( 2 ) according to one of the preceding claims and a calibration adapter ( 3 ) for mounting on the first electrical measuring adapter connection ( 5 ) for calibrating the measuring adapter ( 2 ). Measuring adapter system according to claim 8, wherein the calibration adapter ( 3 ) a shorting bridge ( 17 ) for electrically shorting at least two of the pins ( 12 ) of the first electrical measuring adapter connection ( 5 ) having. Measuring adapter system according to claim 8 or 9, wherein the calibration adapter ( 3 ) a grip element ( 18 ), which is designed such that an electrical connection of the measuring adapter ( 2 ) with the electrical connection with attached calibration adapter ( 3 ) is mechanically blocked. Measuring adapter system according to claim 10 as far as dependent on claim 9, wherein the calibration adapter ( 3 ) at least one spring ( 26 ), which between the shorting bridge ( 17 ) and the handle element ( 18 ) is arranged.

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