Speed sensor test board

Abstract

The utility model relates to the technical field of sensor test devices, in particular to a speed sensor test bench, which comprises a bench body, a rotating speed test assembly, a plurality of internal expansion assemblies, a connecting piece and a rotating piece, and is characterized in that the bench body is provided with a test cavity, and the test cavity is provided with a cable interface and a test interface; the rotating speed testing assembly comprises a shell, a rotating driving device and a matching piece, the shell is arranged in the testing cavity, a rotating shaft of the rotating driving device extends into the shell and is connected with the matching piece, the matching piece is provided with an insertion hole, the internal expansion assemblies are arranged on the shell, each internal expansion assembly comprises a plurality of clamping petals and a pushing piece, and the clamping petals are inserted into the insertion hole. The clamping petals are annularly arranged and surround the outer side walls of the pushing pieces, the pushing pieces are arranged on the shell in a sliding mode, the connecting pieces are connected with the pushing pieces, the rotating piece is rotationally installed on the shell, one end of the rotating piece is connected with the connecting pieces, and the clamping device has the advantages that the clamping device can be quickly connected with a speed sensor, and detection efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of sensor testing devices, and more specifically to a speed sensor testing bench. Background Art

[0002] Speed ​​sensor is a device that converts speed changes into electrical signals and is widely used in vehicle monitoring, industrial automation, safety monitoring and other fields. In order to detect whether the sensitivity of the speed sensor is within the rated range, it is usually tested on a speed sensor test bench.

[0003] Our company currently has a speed sensor test bench, such as Figure 1 As shown, it includes a body 90 and a speed test assembly 91, the body 90 has a test cavity 901, one side of the test cavity 901 has a plurality of cable interfaces 9011 and a test interface 9012, the speed test assembly 91 includes a shell 911, a rotating motor and a matching piece 912, the shell 911 is fixedly installed in the test cavity 901, the shell 911 has an inner cavity with an opening, the opening is connected to the test interface 9012, the rotating motor is fixedly installed on the shell 911, and the rotating shaft of the rotating motor extends into the inner cavity, the matching piece 912 is arranged in the inner cavity, and the matching piece 912 is connected to the rotating shaft of the rotating drive device and rotates with it, the matching piece 912 has a jack 9121 on the side away from the rotating drive device, and the shell 911 has a plurality of threaded holes 9111. Figure 2 When the external speed sensor shown in the figure is used, it should be pointed out that the external speed sensor includes a cable 92, an insertable mass block 93 and a seat body 94, and the seat body 94 has a plurality of connection holes 941. Before the test, the tester electrically connects the cable 92 with the cable interface 9011, inserts the insertable mass block 93 into the plug hole 9121, and screws the external bolts into the connection hole 941 and the threaded hole 9111 in sequence to fix the external speed sensor to the housing 911. Then, the rotating motor is powered, and the rotating shaft of the rotating motor rotates and drives the matching piece 912 to rotate, and drives the insertable mass block 93 to rotate at a certain speed. If the difference between the speed measured by the external speed sensor and the actual speed of the rotating motor is within the standard range, the quality of this external speed sensor is qualified. However, since the seat body 94 and the housing 911 are connected by a plurality of bolts, the bolts need to be screwed multiple times for each speed sensor to be inspected. When the speed sensor is inspected on a large scale, the repetitive screwing of the bolts greatly reduces the inspection efficiency.

[0004] Therefore, there is a need to provide a speed sensor test bench that can be quickly connected to a speed sensor and help improve detection efficiency. Summary of the invention

[0005] The main purpose of the present application is to provide a speed sensor test bench for testing a speed sensor, wherein the speed sensor comprises an inserted mass block, a seat and a cable, wherein the seat is provided with a plurality of connection holes arranged in a ring shape in the circumference thereof, wherein the speed sensor test bench comprises a seat, a rotation speed test assembly, a plurality of internal expansion assemblies, a connecting piece and a rotating piece, wherein the seat has a test cavity, wherein the side wall of the test cavity has a plurality of cable interfaces and a test interface, wherein the rotation speed test assembly comprises a shell, a rotation drive device and a matching piece, wherein the shell is arranged in the test cavity, the shell has an inner cavity with an opening, wherein the opening is connected with the test interface, the rotation drive device is fixedly mounted on the shell, and the rotating shaft of the rotation drive device extends into the inner cavity, the matching piece is arranged in the inner cavity, and the matching piece is connected with the rotating shaft of the rotation drive device and rotates with it, and the matching piece has an insert on the side away from the rotation drive device The cam is configured to have a plurality of locking members, each of which is configured to have a plurality of locking members, each of which is configured to have a plurality of locking members, each of which is configured to have a plurality of locking members, each of which is configured to have a plurality of locking members, each of which is configured to have a plurality of locking members.

[0006] Another object of the present application is to provide a speed sensor test bench, wherein one end of the rotating member has a first spiral portion, and the connecting member has a second spiral portion extending outward on a side close to the rotating member, and the first spiral portion is spirally connected to the second spiral portion, so that when the rotating member rotates through the spiral transmission, the connecting member moves axially.

[0007] In order to achieve at least one of the above-mentioned invention purposes, the present application provides a speed sensor test bench for testing a speed sensor, wherein the speed sensor comprises an inserted mass block, a seat and a cable, wherein the seat has a plurality of connection holes arranged in a ring shape in the circumference thereof, wherein the speed sensor test bench comprises:

[0008] A platform, the platform having a test cavity, the side wall of the test cavity having a plurality of cable interfaces and a test interface; and

[0009] A rotation speed test assembly, comprising a shell, a rotation drive device and a matching piece, wherein the shell is arranged in the test cavity, the shell has an inner cavity with an opening, the opening is communicated with the test interface, the rotation drive device is fixedly mounted on the shell, and the rotating shaft of the rotation drive device extends into the inner cavity, the matching piece is arranged in the inner cavity, the matching piece is connected to the rotating shaft of the rotation drive device and rotates with it, and the matching piece has a plug hole on a side away from the rotation drive device; and

[0010] a plurality of internal expansion components, the internal expansion components are arranged in an annular shape in the circumferential direction of the opening and correspond to the connecting holes one by one, each of the internal expansion components comprises a plurality of clips and a pusher, the clips are arranged in an annular shape and surround the outer wall of the pusher, the pusher is slidably disposed on the housing in the axial direction of the opening, and when the pusher moves axially, the clips move away from or towards each other; and

[0011] a connecting member, the connecting member connecting each of the pushing members; and

[0012] A rotating member is rotatably mounted on the shell, and one end of the rotating member is connected to the connecting member. When the rotating member rotates, the connecting member moves axially, and each of the pushing members moves axially, and the corresponding clamping flaps move toward or away from each other.

[0013] In one or more embodiments of the present application, one end of the rotating member has a first spiral portion, and the side of the connecting member close to the rotating member has a second spiral portion extending outward, and the first spiral portion is spirally connected to the second spiral portion.

[0014] In one or more embodiments of the present application, the outer side surface of each of the clamping flaps has an extension portion, the shell has a plurality of stepped holes, a pushing member is slidably arranged in each of the stepped holes, and each of the stepped holes has a plurality of sliding grooves at one end close to the test interface, the sliding grooves correspond one-to-one to the clamping flaps, and the extension portion is slidably arranged in the sliding grooves.

[0015] In one or more embodiments of the present application, the end of the rotating member away from the first spiral portion has a gripping portion, the gripping portion extends out of the wall of the platform by a predetermined distance, and the side wall of the gripping portion has knurling.

[0016] In one or more embodiments of the present application, the platform also has an electrical control cavity for placing circuit components, a accommodating cavity for placing an oscilloscope, an open cavity for placing a printer, a sundries drawer and a power supply cavity, and a power supply is provided in the power supply cavity, and the power supply is electrically connected to the rotation drive device.

[0017] In one or more embodiments of the present application, the power supply cavity is located directly below the test cavity, the accommodating cavity is located directly above the open cavity, the sundries drawer is located directly below the open cavity, the electric control cavity is located between the test cavity and the accommodating cavity in the length direction of the platform, and the electric control cavity is located on a side of the platform away from the test interface.

[0018] In an embodiment of the present application, a speed sensor test bench includes a body, a speed test assembly, a plurality of internal expansion assemblies, a connecting piece and a rotating piece. The body has a test cavity, and the test cavity has a cable interface and a test interface. The speed test assembly includes a shell, a rotation drive device and a matching piece. The shell is arranged in the test cavity, and the rotating shaft of the rotation drive device extends into the shell and is connected to the matching piece. The matching piece has a plug hole. The internal expansion assembly is arranged on the shell. Each internal expansion assembly includes a plurality of clips and a push piece. The clips are arranged in an annular shape and surround the outer wall of the push piece. The push piece is slidably arranged on the shell. The connecting piece connects each push piece. The rotating piece is rotatably installed on the shell, and one end of the rotating piece is connected to the connecting piece. When the rotating piece rotates, the connecting piece moves axially, and each push piece follows the axial movement, and the corresponding clips move toward or away from each other. Compared with the prior art that requires multiple screwing of bolts, the embodiment of the present application has the advantage of being able to quickly connect to the speed sensor, which helps to improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] These and / or other aspects and advantages of the present application will become clearer and easier to understand from the following detailed description of the embodiments of the present application in conjunction with the accompanying drawings, in which:

[0020] Figure 1 The figure shows a structural schematic diagram of an existing speed sensor test bench;

[0021] Figure 2 The figure shows a schematic diagram of the structure of an existing speed sensor;

[0022] Figure 3 The figure shows a schematic structural diagram of the front side of a speed sensor test bench of the utility model;

[0023] Figure 4 Pictured Figure 3 A local enlarged view of point C;

[0024] Figure 5 The figure shows a schematic structural diagram of the back side of a speed sensor test bench of the utility model;

[0025] Figure 6 The figure shows a schematic diagram of the structure of the speed test assembly;

[0026] Figure 7 The figure shows the structural schematic diagram of the internal expansion component, the connecting part and the rotating part;

[0027] Figure 8 Pictured Figure 6 A local enlarged view of point D. DETAILED DESCRIPTION

[0028] The terms and words used in the following specification and claims are not limited to the literal meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustrative purposes only and not for the purpose of limiting the present application as defined by the appended claims and their equivalents.

[0029] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0030] Although ordinals such as "first," "second," and the like will be used to describe various components, those components are not limited herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and likewise, a second component may be referred to as a first component without departing from the teachings of the utility model concept. The term "and / or" as used herein includes any and all combinations of one or more associated listed items.

[0031] The terms used herein are only used for the purpose of describing various embodiments and are not intended to be limiting. As used herein, singular forms are intended to also include plural forms, unless the context clearly indicates an exception. In addition, it will be understood that the terms "including" and / or "having" when used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0032] Application Overview

[0033] In the existing speed sensor test bench, since the seat and the shell are connected by multiple bolts, each time a speed sensor is tested, the bolts need to be tightened multiple times. When testing speed sensors on a large scale, the repetitive tightening of the bolts greatly reduces the detection efficiency.

[0034] Based on the above technical problems, the present application proposes a speed sensor test bench, wherein the speed sensor test bench has a simple structure, does not involve complex manufacturing processes and expensive materials, and has high economic efficiency. At the same time, for manufacturers, the speed sensor test bench provided by the present application is easy to produce and low-cost, which is more conducive to controlling production costs and further conducive to product promotion and use.

[0035] Schematic speed sensor test bench,

[0036] refer to Figures 3 to 8 According to a preferred embodiment of the utility model, a speed sensor test bench is used to test Figure 2 The speed sensor shown in the figure includes an inserted mass block 93, a seat body 94 and a cable 92. The seat body 94 is provided with a plurality of connecting holes 941 arranged in a ring shape in the circumference. In the embodiment of the present application, the number of the connecting holes 941 is four.

[0037] Furthermore, if Figure 3 , Figure 4 and Figure 5 As shown, the speed sensor test bench includes a body 10, and the body 10 has a test cavity 101, and the side wall of the test cavity 101 has a plurality of cable interfaces 1011 and a test interface 1012. In the embodiment of the present application, the cable interface 1011 includes a standard fourteen-core interface, a standard seven-core interface, a voltage-type interface, a current-type interface, a magnetoelectric interface, and a stepping motor interface. The standard fourteen-core interface and the standard seven-core interface are located on the front of the body 10, and the voltage-type interface, the current-type interface, the magnetoelectric interface, and the stepping motor interface are located on the side of the body 10. In addition, the test interface 1012 is located on the front of the body 10 and below the standard fourteen-core interface.

[0038] In addition, if Figure 6As shown, the speed sensor test bench also includes a speed test assembly 20, which includes a housing 201, a rotation drive device 202 and a matching piece 203. The housing 201 is arranged in the test cavity 101, and the housing 201 has an inner cavity with an opening 2011 (not shown in the figure), and the opening 2011 is connected to the test interface 1012. The rotation drive device 202 is a rotating motor, and the rotation drive device 202 is fixedly installed on a side of the housing 201 away from the opening 2011 by bolts, and the rotating shaft of the rotation drive device 202 extends into the inner cavity. The mating piece 203 comprises a shaft portion 2031 and a plate portion 2032, the shaft portion 2031 is fixedly connected to the plate portion 2032, and the fixed connection method includes but is not limited to welding or integral processing and forming, the mating piece 203 is arranged in the inner cavity, and the shaft portion 2031 of the mating piece 203 is connected to the rotating shaft of the rotating drive device 202 through a coupling and follows the rotation, the mating piece 203 has a socket 2033 on the side away from the rotating drive device 202, that is, the plate portion 2032 has the socket 2033, and the socket 2033 is a square hole.

[0039] It should be noted that during the test, the tester electrically connects the cable 92 of the speed sensor to the cable interface 1011, and inserts the plug-in mass block 93 into the jack 2033. When the shaft of the rotation drive device 202 rotates, the matching piece 203 rotates accordingly and drives the plug-in mass block 93 to rotate. The sensor measures the rotation speed of the plug-in mass block 93 according to its internal sensitive element and outputs a signal, and outputs an electrical signal through its internal conversion element and conversion circuit to obtain the rotation speed. Then, by comparing the actual rotation speed of the rotation drive device 202 with the measured rotation speed of the speed sensor, it is determined whether the sensitivity of the speed sensor is qualified. Since the speed sensor technology is mature and widely used in the market, the internal structure and model of the speed sensor are not described in detail here. The speed sensor includes but is not limited to the speed sensor with a seat, a mass block, and a cable disclosed in the patent document (CN117607489B).

[0040] It should also be noted that in the prior art, in order to fix the speed sensor on the housing 201, the base 94 and the housing 201 are bolted together by external bolts. However, in the large-scale detection process, each time a speed sensor is measured, the bolts need to be tightened multiple times. When the speed sensors are detected in large quantities, the detection efficiency is low.

[0041] In view of this, in the embodiment of the present application, the speed sensor test bench further includes a plurality of internal expansion components 30 , a connecting member 40 and a rotating member 50 .

[0042] Specifically, Figure 6 As shown, the internal expansion components 30 are arranged in a ring shape in the circumferential direction of the opening 2011 and correspond one-to-one with the connecting holes 941. Each of the internal expansion components 30 includes a plurality of clamping petals 301 and a pushing member 302. The clamping petals 301 are arranged in a ring shape and surround the outer wall of the pushing member 302. The pushing member 302 is slidably provided on the shell 201 in the axial direction of the opening 2011. When the pushing member 302 moves axially, the clamping petals 301 move away from or towards each other. The clamping petals 301 in each of the internal expansion components 30 together constitute a clamping petal group.

[0043] In addition, if Figure 7 As shown, the connecting member 40 is connected to each of the pushing members 302 .

[0044] In addition, refer to Figure 7 The rotating member 50 is rotatably mounted on the housing 201 via a bearing, and one end of the rotating member 50 is connected to the connecting member 40. When the rotating member 50 rotates, the connecting member 40 moves axially, and each of the pushing members 302 moves axially therewith, and the corresponding clamping flaps 301 move toward or away from each other.

[0045] It should be noted that, assuming that the radial dimension of the clip group in each of the internal expansion components 30 is the smallest at this time, the tester only needs to align the connection hole 941 of the seat body 94 with each of the clip groups. When the inserted mass block 93 is inserted into the insertion hole 2033, the clip group in each of the internal expansion components 30 is inserted into the corresponding connection hole 941. Subsequently, the tester only needs to rotate the rotating member 50, and the connecting member 40 moves axially toward the test interface 1012, and each The clips 301 move in opposite directions, and the radial dimension of the clip group gradually increases. At a certain moment, the clip group and the corresponding connecting hole 941 are in interference fit, so that the seat body 94 is fixed on the housing 201. Similarly, when removing the speed sensor, the tester only needs to rotate the rotating member 50 in the opposite direction, so that each of the clips 301 moves in opposite directions, and the radial dimension of the clip group is smaller than the aperture of the connecting hole 941, so that the seat body 94 is separated from the housing 201. Obviously, by setting the connecting member 40, each of the pushing members 302 moves synchronously, and then only the rotating member 50 needs to be moved to realize the movement of multiple internal expansion components 30. Compared with the prior art that requires repetitive screwing of multiple bolts, the embodiment of the present application has the advantage of being able to quickly connect with the speed sensor, which helps to improve the detection efficiency.

[0046] Furthermore, in order to realize the movement of the pushing member 302 so that the clamping flaps 301 move toward or away from each other in the circumferential direction, the inner wall of each clamping flap 301 has a conical surface, and the pushing member 302 has a conical surface at one end on which the clamping flap 301 is sleeved. When the clamping flap 301 is sleeved on the pushing member 302, the conical surface inside the clamping flap 301 fits with the conical surface on the pushing member 302, and the radial dimension of the conical surface close to one end of the clamping flap 301 gradually increases to the radial dimension of the conical surface close to one end of the rotary drive device 202.

[0047] In addition, in order to make the clip 301 always fit the pusher 302, Figure 7 As shown, the outer side wall of the clamping flap 301 has an annular groove 3011 for accommodating a coil spring.

[0048] In addition, in order to realize that the clamping flap 301 slides only along the circumferential direction, as shown in FIG. Figures 6 to 8 As shown, the outer side surface of each of the clamping flaps 301 has an extension portion 3012, the shell 201 has a plurality of stepped holes 2012, and a pushing member 302 is slidably arranged in each of the stepped holes 2012, and the side surface of the pushing member 302 at one end away from the clamping flap 301 is in contact with the hole wall at the end with the smaller aperture of the stepped hole 2012, and a guiding effect is provided to the pushing member 302 through the stepped hole 2012, and each of the stepped holes 2012 has a plurality of slide grooves 2013 at one end close to the test interface 1012, and the slide grooves 2013 correspond to the clamping flaps 301 one by one, and the extension portion 3012 is slidably arranged in the slide groove 2013.

[0049] Furthermore, in order to realize the rotation of the rotating member 50, the connecting member 40 moves axially along the direction of the test interface 1012, such as Figure 7 As shown, one end of the rotating member 50 has a first spiral portion 501 , and the side of the connecting member 40 close to the rotating member 50 has a second spiral portion 401 extending outward, and the first spiral portion 501 is spirally connected to the second spiral portion 401 .

[0050] Furthermore, in order to facilitate the tester to rotate the rotating member 50, as shown in FIG. Figure 7 As shown, the end of the rotating member 50 away from the first spiral portion 501 has a gripping portion 502 , the gripping portion 502 extends out of the wall of the platform 10 by a predetermined distance, and the side wall of the gripping portion 502 has knurling.

[0051] Furthermore, if Figure 3 and Figure 5As shown, the platform 10 also has an electric control cavity 102 for placing circuit components, a receiving cavity 103 for placing an oscilloscope, an open cavity 104 for placing a printer, a sundries drawer 105 and a power supply cavity 106. A power supply is provided in the power supply cavity 106, and the power supply is electrically connected to the rotation drive device 202. It should be noted that in the embodiment of the present application, the power supply cavity 106 is located directly below the test cavity 101, the receiving cavity 103 is located directly above the open cavity 104, the sundries drawer 105 is located directly below the open cavity 104, the electric control cavity 102 is located between the test cavity 101 and the receiving cavity 103 in the length direction of the platform 10, and the electric control cavity 102 is located on the side of the platform 10 away from the test interface 1012. In addition, the table top of the platform 10 provides space for placing a computer.

[0052] In summary, the speed sensor test bench according to the embodiment of the present application is explained, which provides the speed sensor test bench with advantages such as being able to quickly connect to a speed sensor, thereby helping to improve detection efficiency.

[0053] It is worth mentioning that in the embodiment of the present application, the speed sensor test bench has a simple structure, does not involve complex manufacturing processes and expensive materials, and has high economic efficiency. At the same time, for manufacturers, the speed sensor test bench provided by the present application is easy to produce and has low cost, which is more conducive to controlling production costs and further conducive to product promotion and use.

[0054] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A speed sensor test bench for testing a speed sensor, the speed sensor comprising an inserted mass block, a seat and a cable, the seat having a plurality of connection holes arranged in a ring shape around the circumference, characterized in that: The speed sensor test bench comprises A platform, the platform having a test cavity, the side wall of the test cavity having a plurality of cable interfaces and a test interface; and A rotation speed test assembly, comprising a shell, a rotation drive device and a matching piece, wherein the shell is arranged in the test cavity, the shell has an inner cavity with an opening, the opening is communicated with the test interface, the rotation drive device is fixedly mounted on the shell, and the rotating shaft of the rotation drive device extends into the inner cavity, the matching piece is arranged in the inner cavity, the matching piece is connected to the rotating shaft of the rotation drive device and rotates with it, and the matching piece has a plug hole on a side away from the rotation drive device; and a plurality of internal expansion components, the internal expansion components are arranged in an annular shape in the circumferential direction of the opening and correspond to the connecting holes one by one, each of the internal expansion components comprises a plurality of clips and a pusher, the clips are arranged in an annular shape and surround the outer wall of the pusher, the pusher is slidably disposed on the housing in the axial direction of the opening, and when the pusher moves axially, the clips move away from or towards each other; and a connecting member, the connecting member connecting each of the pushing members; as well as A rotating member is rotatably mounted on the shell, and one end of the rotating member is connected to the connecting member. When the rotating member rotates, the connecting member moves axially, and each of the pushing members moves axially, and the corresponding clamping flaps move toward or away from each other.

2. The speed sensor test bench according to claim 1, characterized in that: One end of the rotating member has a first spiral portion, and a side of the connecting member close to the rotating member has a second spiral portion extending outward, and the first spiral portion is connected to the second spiral portion in a spiral transmission manner.

3. The speed sensor test bench according to claim 2, characterized in that: The outer side surface of each of the clamping petals has an extension portion, the shell has a plurality of stepped holes, a pushing member is slidably arranged in each of the stepped holes, and each of the stepped holes has a plurality of slide grooves at one end close to the test interface, the slide grooves correspond one-to-one to the clamping petals, and the extension portion is slidably arranged in the slide grooves.

4. The speed sensor test bench according to claim 3, characterized in that: The end of the rotating member away from the first spiral portion has a gripping portion, the gripping portion extends out of the wall surface of the platform by a predetermined distance, and the side wall of the gripping portion has knurling.

5. The speed sensor test bench according to any one of claims 1 to 4, characterized in that: The platform body also has an electric control cavity for placing circuit components, a containing cavity for placing an oscilloscope, an open cavity for placing a printer, a sundries drawer and a power supply cavity, in which a power supply is arranged, and the power supply is electrically connected to the rotating drive device.

6. The speed sensor test bench according to claim 5, characterized in that: The power supply cavity is located directly below the test cavity, the accommodating cavity is located directly above the open cavity, the sundries drawer is located directly below the open cavity, the electric control cavity is located between the test cavity and the accommodating cavity in the length direction of the platform body, and the electric control cavity is located on a side of the platform body away from the test interface.

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