CN211042540U

CN211042540U - Testing device

Info

Publication number: CN211042540U
Application number: CN201922413215.7U
Authority: CN
Inventors: 娄阳; 常银雷
Original assignee: Siemens Power Plant Automation Ltd
Current assignee: Siemens Energy Automation Nanjing Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-07-17
Anticipated expiration: 2029-12-27

Abstract

The utility model provides a testing device. The testing device is used for testing the thermal resistance clamping piece and is characterized by comprising: the resistance box comprises N resistors and an output interface connected with the N resistors; the transmission cable comprises a first terminal row, a second terminal row and N transmission channels, two ends of each transmission channel in the N transmission channels are respectively connected with the first terminal row and the second terminal row, the first terminal row is connected with an output interface, the second terminal row is connected with N measurement channels of the thermal resistor clamping piece, and N resistors can be connected with the N transmission channels and the N measurement channels in a one-to-one correspondence mode to form N closed loops so as to test the thermal resistor clamping piece. The utility model discloses a testing arrangement can once accomplish the test to all measure the passageway of a thermal resistance fastener, and is convenient quick, labour saving and time saving.

Description

Testing device

Technical Field

The utility model relates to a testing device.

Background

The thermal resistor is a temperature detection element that performs temperature measurement based on the thermal effect of the resistor. The thermal effect of the resistor refers to the characteristic that the resistance value of the resistor changes with the change of temperature. Thermal resistors are commonly used temperature sensing elements in industrial processes.

The thermal resistance score table refers to a table supported according to the correspondence between the resistance value of the resistor and the temperature value. Different types of thermal resistors have different thermal resistance fractions. For some specific thermal resistors, such as Pt100 platinum thermistor, Cu100 copper thermistor, etc., a thermal resistance chart is specifically programmed and published.

For a distributed control system, in order to perform control operation, the control system collects field information through various sensors, detection elements and the like at a user end, wherein the field information includes temperature detection elements such as thermal resistors. The thermal resistor is connected with a thermal resistor clamping piece of the control cabinet through a lead so as to measure the temperature.

After the control cabinet is manufactured, tests including testing the thermal resistance clamping piece are needed. In the conventional testing method, a resistor box having a resistor is used to simulate the resistance of the thermal resistor. Two wires are used to connect the resistors in the resistive case to one measurement channel of the thermal resistive clip. The thermal resistor block generates a temperature value based on the resistance value measured by the resistor. Meanwhile, manually inquiring the thermal resistance graduation meter, manually converting to obtain a temperature value corresponding to the resistance value of the resistor, comparing the two temperature values, and analyzing the measurement precision of the thermal resistance clamping piece. Because the control cabinet often has a large amount of measuring channels to be tested, and the testing mode needs to test all measuring channels one by one, a large amount of repeated work needs to be done, and the control cabinet is inconvenient, time-consuming and labor-consuming.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a testing arrangement. The testing device can be used for testing all measuring channels of one thermal resistor clamping piece at one time, is convenient to read quickly, and improves the testing efficiency.

In order to achieve the above object, the utility model provides a testing device, testing device includes: the resistance box comprises N resistors and output interfaces connected with the N resistors, wherein N is the number of measuring channels included by the tested thermal resistor clamping piece; the transmission cable comprises a first terminal row, a second terminal row and N transmission channels, two ends of each transmission channel in the N transmission channels are respectively connected with the first terminal row and the second terminal row, the first terminal row is connected with an output interface, the second terminal row is connected with N measurement channels of the thermal resistor clamping piece, and N resistors can be connected with the N transmission channels and the N measurement channels in a one-to-one correspondence mode to form N closed loops so as to test the thermal resistor clamping piece.

In the above mode, through testing arrangement, can once only accomplish the test to all measuring channels of a thermal resistance fastener through N resistors in the resistance box, convenient and fast, labour saving and time saving.

In another exemplary embodiment of the testing apparatus, the measurement channel includes two power supply terminals and two measurement terminals, each of the N transmission channels includes four wires, each of the N resistors includes two connection terminals, the two power supply terminals of each measurement channel are respectively connected with the two connection terminals of one of the N resistors through the two wires of one of the N transmission channels and the output interface to form a closed loop, and the two power supply terminals provide a constant current to the closed loop; two measurement terminals of each measurement channel in the N transmission channels are respectively connected with two connection ends of one resistor in the N resistors through the other two wires of one transmission channel in the N transmission channels and the output interface so as to measure voltages of the two connection ends.

In another exemplary embodiment of the test apparatus, at least one of the N resistors is a resistor capable of adjusting a resistance value.

In a further exemplary embodiment of the test device, the resistor box comprises a plug which is connected to the output interface and is designed to be able to plug in or plug out the resistor, the resistor being connected to the output interface when the resistor is plugged in.

In yet another exemplary embodiment of the testing device, the resistance box includes eight resistors.

In still another exemplary embodiment of the testing apparatus, the resistance box includes a display screen configured to display a connection state of each of the N resistors and a temperature value corresponding to a resistance value of each resistor.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. In the drawings, similar components or features may have the same reference numerals. Wherein,

fig. 1 schematically illustrates a testing device according to the present invention;

fig. 2 schematically illustrates one way of connecting a resistor to a measurement channel according to the invention;

fig. 3 schematically shows a resistance box comprising a display screen according to the invention.

Reference numerals

10 resistance box

12 resistor

122 connecting end

14 output interface

16 display screen

20 transmission cable

22 first terminal row

24 second terminal row

26 transport channel

262 conducting wire

50 thermal resistance fastener

52 measurement channel

522 power supply terminal

524 measuring terminal

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thereby implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as needed. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with respect to some examples may also be combined in other examples.

As used herein, the term "include" and its variants mean open-ended terms in the sense of "including, but not limited to. The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first," "second," and the like may refer to different or the same object. Other definitions, whether explicit or implicit, may be included below. The definition of a term is consistent throughout the specification unless the context clearly dictates otherwise.

Fig. 1 schematically shows a testing device according to the present invention. As shown in fig. 1, the test apparatus includes a resistance box 10 and a transmission cable 20. The test apparatus is used to test a thermal electrical resistance clip 50, the thermal electrical resistance clip 50 including N measurement channels 52.

The resistance box 10 comprises N resistors 12, i.e. the number of resistance boxes 10 corresponds to the number of measurement channels 52. Under the condition that thermal resistance fastener 50 includes N measuring channel 52, the utility model discloses a testing arrangement can once accomplish the test of all N measuring channel 52 of thermal resistance fastener 50, once accomplishes the test to thermal resistance fastener 50 promptly.

In a typical thermal resistive clip 50, eight measurement channels 52 are included. Thus, in one embodiment of the present invention, as shown in fig. 1, the resistance box 10 includes 8 resistors 12.

As shown in fig. 1, the resistor box 10 further includes an output interface 14, and the output interface 14 and the N resistors 12 are respectively connected.

As shown in fig. 1, the transmission cable 20 includes a first terminal row 22, a second terminal row 24, and N transmission channels 26. Each transmission channel 26 is connected at both ends to the first terminal row 22 and the second terminal row 24, respectively. The first terminal bank 22 is connected to the output interface 14 and the second terminal bank 24 is connected to the N measurement channels 52, so that each of the N resistors 12 can be connected to one of the N measurement channels 52 through one of the N transmission channels 26, and in one-to-one correspondence, thereby forming N closed loops. Thus, the testing device can conveniently and quickly complete the testing of the N measuring channels 52 of the thermal resistor card 50.

According to the operating principle of the thermal resistor, in order to measure the resistance value of the thermal resistor, it is necessary to connect the thermal resistor and the measuring device through a wire. The main conducting wire modes of the existing thermal resistor are a two-wire system, a three-wire system and a four-wire system. For example, in the case where the test channel 52 of thermal resistor escapement 50 is a two-wire or three-wire system connected thermal resistor, the resistor 12 should be connected to the measurement channel 52 in two-wire and three-wire systems accordingly at the time of testing.

Thermal resistors may be connected to measurement channel 52 of thermal resistor block 50 in a four wire system, taking into account the high accuracy of temperature measurements that thermal resistor blocks need to perform in many cases. Fig. 2 schematically shows a connection of a resistor to a measurement channel according to the invention. As shown in fig. 2, in an embodiment of the present invention, the resistor 12 includes two connection ends 122, the measurement channel 52 includes two power supply terminals 522 and two measurement terminals 524, the transmission channel 26 includes 4 wires 262, and the two connection ends 122 are respectively connected to the two power supply terminals 522 through the two wires 262. The two power supply terminals 522 form a closed loop by the two wires 262 and the resistor 12, and the two power supply terminals 522 supply a constant current to the resistor 12 and convert the constant current into a voltage signal through the resistor 12. Meanwhile, the two connection terminals 122 are also connected to two measurement terminals 524 through another two wires 262, respectively, to form a measurement circuit, and the two measurement terminals 524 measure the voltages of the two connection terminals 122 of the resistor 12.

Alternatively, the N resistors 12 may use resistors having the same resistance value. Thus, when the thermal resistor chuck 50 is tested, the measurement accuracy of the measurement channel 52 of the thermal resistor chuck 50 can be clearly seen and compared. On the other hand, as mentioned above, typically the control cabinet includes a plurality of thermal block 50, each thermal block 50 including a plurality of measurement channels 52. In this case, wiring errors may occur, in particular in the case of the four-wire system as mentioned in one of the above embodiments, which may lead to a situation in which the closed loop of the supply and the measuring circuit are not in the way of one measuring channel. In this case, if the resistor box 10 uses the resistors 12 having the same resistance value, the error of the wiring installation cannot be recognized during the test. Therefore, at least one of the resistance values of the N resistors 12 in the resistance box 10 may be different from the other resistance values, and further, the resistance values of the N resistors 12 may all be different.

In an embodiment of the present invention, at least one resistor 12 of the N resistors 12 is a resistor capable of adjusting a resistance value. Further, the N resistors 12 are all resistors capable of adjusting the resistance value. Thus, when it is necessary to compare the measurement accuracy of the respective measurement channels 52, the resistance values of the N resistors 12 can be adjusted to the same value; when it is necessary to test whether the line installation of each measurement channel 52 is correct, the resistance value of the corresponding resistor 12 can be varied individually for each measurement channel 52, and it can be known whether the line installation is correct by the change of the measurement result of the measurement channel 52.

Similarly, in an embodiment of the present invention, the resistor box 10 includes a plug (not shown) connected to the output interface 14, the plug is used for plugging the resistor 12, and the resistor 12 can also be pulled out from the plug to replace the resistor with different resistance. The resistor 12 is connected to the output interface 14 in the case of a plug-in connection of the resistor 12. The purpose of this embodiment is also to adjust the resistance value of the resistor 12 in the closed loop. For testing, a set of resistors with specific resistance values can be selected and inserted into the plug respectively for testing the thermal resistor card 50.

Fig. 3 schematically shows a resistance box comprising a display screen according to the invention. As shown in fig. 3, in an embodiment of the present invention, the resistance box 10 includes a display screen 16, and the display screen 16 can display a connection state of each of the N resistors 12 and a temperature value corresponding to a resistance value of each resistor.

For example, if the resistors 12 are not properly connected, the display screen 16 displays the status of the corresponding resistor 12 as "error", and further may be red or flash; or, as in the embodiment including the plug, if the plug is not inserted into the resistor 12, the resistance value of the corresponding resistor 12 on the display screen 16 is "0".

The purpose of the resistor 12 is to simulate the thermal resistance for temperature measurement to which the thermal block 50 is attached. In this embodiment, the display screen 16 is capable of displaying the temperature value simulated by each resistor 12 as measured at the thermal resistance having the corresponding resistance value. In the testing process of the testing device, the temperature value can be compared with the temperature value measured by the measuring channel 52 of the thermal resistor block 50, so that the measuring accuracy of the measuring channel 52 can be calculated. If the measurement accuracy does not meet the requirement, the device can be calibrated to meet the measurement requirement.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims

1. A testing device for testing a thermal electric resistance card (50), characterized in that the testing device comprises:

a resistance box (10) comprising N resistors (12) and an output interface (14) connected to the N resistors, where N is the number of measurement channels (52) included by a thermal resistor cartridge (50) being tested;

the transmission cable (20) comprises a first terminal row (22), a second terminal row (24) and N transmission channels (26), wherein two ends of each transmission channel in the N transmission channels are respectively connected with the first terminal row and the second terminal row, the first terminal row is connected with an output interface, the second terminal row is connected with N measuring channels of the thermal resistance clamping piece, and N resistors can be connected with the N transmission channels and the N measuring channels in a one-to-one correspondence mode to form N closed loops respectively so as to test the thermal resistance clamping piece.

2. The test device according to claim 1, wherein the measurement channel comprises two power supply terminals (522) and two measurement terminals (524), each of the N transmission channels comprises four wires (262), each of the N resistors comprises two connection terminals (122), the two power supply terminals of each measurement channel are respectively connected with the two connection terminals of one of the N resistors through the two wires of one of the N transmission channels and the output interface so as to form a closed loop, and the two power supply terminals provide a constant current to the closed loop; two measurement terminals of each measurement channel in the N transmission channels are respectively connected with two connection ends of one resistor in the N resistors through the other two wires of one transmission channel in the N transmission channels and the output interface so as to measure voltages of the two connection ends.

3. The test device of claim 1, wherein at least one of the N resistors is a resistor capable of adjusting a resistance value.

4. A testing device according to claim 1, characterized in that the resistance box comprises a plug which is connected to the output interface, the plug being configured to be able to plug in or plug out the resistor, the resistor being connected to the output interface in the case of plugging in the plug.

5. The test device of claim 1, wherein the resistance box comprises eight resistors.

6. The testing device according to claim 1, wherein the resistance box comprises a display screen (16) configured to display a connection state of each of the N resistors and a temperature value corresponding to a resistance value of each resistor.