A temperature instrument comprehensive tester

Abstract

The utility model discloses a temperature meter comprehensive tester, belonging to the technical field of temperature meter function verification. A temperature sampling channel comprises a plurality of parallel precision sampling resistors, each precision sampling resistor has a different resistance value, each precision sampling resistor is connected in series with a sampling value switch contact, and both ends of the temperature sampling channel are connected to an output interface according to a three-wire connection method; a temperature simulation channel comprises a precision adjustable potentiometer, the precision adjustable potentiometer is connected in series with an action value switch contact, and both ends of the temperature simulation channel are connected to the output interface according to a three-wire connection method; a switch quantity test channel comprises a digital resistance meter, a power supply end of the digital resistance meter is connected to a lithium battery pack, and an input end is connected to a switch quantity analog quantity test interface; an analog quantity test channel comprises a digital ammeter, a power supply end of the digital ammeter is connected to a lithium battery pack, and an input end is connected to a switch quantity analog quantity test interface; the working efficiency of temperature meter verification can be greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of temperature instrument function verification, and in particular relates to a temperature instrument comprehensive tester. Background Art

[0002] Temperature meters are installed on dry-type transformers. These temperature meters monitor and protect the temperature of the coils and cores of dry-type transformers. When the temperature reaches the fan start-up setting, the temperature meter will start the fan to cool the dry-type transformer. When the temperature is too high, an alarm signal will be issued. When the temperature is too high, a trip signal will be issued. The correct operation of the temperature meter plays a vital role in the safe and stable operation of the dry-type transformer. Therefore, these temperature meters need to be calibrated regularly.

[0003] At present, the sampling value, set value, switch output and analog output inspection of temperature instruments are generally completed through a resistance box, a multimeter and an ammeter. There are problems such as frequent wiring changes, long time consumption, cumbersome testing and low work efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a temperature meter comprehensive tester to solve the problems that the sampling value, fixed value, switch output and analog output inspection of the temperature meter are generally completed by a resistance box, a multimeter and an ammeter, which has the problems of frequent wiring changes, long time consumption, cumbersome testing and low work efficiency.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A temperature instrument comprehensive tester, comprising at least one group of temperature sampling channels, at least one group of temperature simulation channels, at least one group of switch quantity test channels and at least one group of analog quantity test channels;

[0007] The temperature sampling channel includes a plurality of precision sampling resistors connected in parallel, each precision sampling resistor has a different resistance value, each precision sampling resistor is connected in series with a sampling value switch contact, and both ends of the temperature sampling channel are connected to the output interface according to a three-wire connection method;

[0008] The temperature simulation channel includes a precision adjustable potentiometer, the precision adjustable potentiometer is connected in series with an action value switch contact, and both ends of the temperature simulation channel are connected to the output interface according to a three-wire connection method;

[0009] The switch quantity test channel includes a digital resistance meter, the power supply end of the digital resistance meter is connected to the lithium battery pack, and the input end is connected to the switch quantity analog quantity test interface;

[0010] The analog quantity test channel comprises a digital ammeter, a power supply end of the digital ammeter is connected to a lithium battery pack, and an input end of the digital ammeter is connected to a switch quantity analog quantity test interface.

[0011] In some embodiments, the device comprises a housing, the precision sampling resistor and the lithium battery pack are arranged inside the device housing, and the sampling value switch, output interface, precision adjustable potentiometer, action value switch, digital resistance meter, digital ammeter and switch quantity analog quantity test interface are all arranged on the device housing.

[0012] In some embodiments, a power switch AN is provided between the lithium battery pack and the digital resistance meter and the digital ammeter, the lithium battery pack is provided with a charging port, and the power switch AN and the charging port are provided on the device housing.

[0013] In some embodiments, there are four groups of temperature sampling channels, each group of temperature sampling channels includes sixteen precision sampling resistors, the resistance values ​​of the sixteen precision sampling resistors of temperature sampling channels in different groups are the same, there are four groups of temperature simulation channels, there are five groups of switch quantity test channels, and there are three groups of analog quantity test channels.

[0014] In some embodiments, the sampling value switch is a three-speed switching switch, and the contacts corresponding to the "1" position of each sampling value switch are respectively connected to a precision sampling resistor with the same resistance value as the four groups of temperature sampling channels, and the contacts corresponding to the "2" position are respectively connected to another precision sampling resistor with the same resistance value as the four groups of temperature sampling channels, and the precision sampling resistors connected to each sampling value switch are different; the action value switch is a three-speed switching switch, and the contacts corresponding to the "1" position of the action value switch are respectively connected in series with the precision adjustable potentiometers of the four groups of temperature simulation channels.

[0015] In some embodiments, the output interface includes a DB25 base, a DB15 base, and a DB9 base, one end of the first group of temperature sampling channels and the first group of temperature simulation channels are respectively connected to the 1st pin of the DB25 base, the DB15 base, and the DB9 base, and the other end is respectively connected to the 9th pin and the 14th pin of the DB25 base, the 6th pin and the 9th pin of the DB15 base, and the 2nd pin and the 7th pin of the DB9 base; one end of the second group of temperature sampling channels and the second group of temperature simulation channels are respectively connected to the 2nd pin of the DB25 base, the DB15 base, and the 3rd pin of the DB9 base, and the other end is respectively connected to the D Pins 10 and 15 of the B25 base, pins 7 and 10 of the DB15 base, and pins 4 and 8 of the DB9 base; one end of the third group of temperature sampling channels and the third group of temperature simulation channels are connected to pins 3 of the DB25 base and the DB15 base, and pin 5 of the DB9 base, and the other ends are connected to pins 11 and 16 of the DB25 base, pins 8 and 11 of the DB15 base, and pins 6 and 9 of the DB9 base; one end of the fourth group of temperature sampling channels and temperature simulation channels is connected to pin 4 of the DB25 base, and the other ends are connected to pins 17 and 23 of the DB25 base.

[0016] The utility model provides a temperature meter comprehensive tester, which has the following beneficial effects:

[0017] The temperature channel sampling value calibration of the temperature instrument can be realized through the temperature sampling channel, the temperature channel fixed value calibration of the temperature instrument can be realized through the temperature simulation channel, the switch quantity can be measured through the switch quantity test channel to realize the switch quantity output test of the temperature instrument, and the analog quantity output test of the temperature instrument can be realized through the analog quantity test channel, which can greatly improve the work efficiency of temperature instrument calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a temperature instrument comprehensive tester of the utility model;

[0019] Figure 2 This is a wiring circuit diagram of a temperature sampling channel and a temperature simulation channel of a temperature instrument comprehensive tester of the utility model;

[0020] Figure 3 This is a wiring circuit diagram of a switch quantity test channel and an analog quantity test channel of a temperature instrument comprehensive tester of the utility model;

[0021] Reference numerals:

[0022] 1- sampling value switch, 2- output interface, 3- precision adjustable potentiometer, 4- action value switch, 5- digital resistance meter, 6- switch quantity analog quantity test interface, 7- digital ammeter, 8- device housing, 9- power switch AN, 10- charging port. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0024] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0025] If similar descriptions of "first\second\third" appear in the application documents, the following instructions will be added. In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0027] Embodiment 1

[0028] This embodiment provides a temperature meter comprehensive tester, Figure 1 This is a schematic diagram of the structure of a temperature instrument comprehensive tester of the utility model. Figure 1 As shown, it includes at least one group of temperature sampling channels, at least one group of temperature simulation channels, at least one group of switch quantity test channels and at least one group of analog quantity test channels;

[0029] The temperature sampling channel includes a plurality of parallel precision sampling resistors, each precision sampling resistor has a different resistance value, each precision sampling resistor is connected in series with a sampling value switch 1 contact, and both ends of the temperature sampling channel are connected to the output interface 2 according to a three-wire connection method;

[0030] The temperature simulation channel includes a precision adjustable potentiometer 3, the precision adjustable potentiometer 3 is connected in series with an action value switch 4 contact, and both ends of the temperature simulation channel are connected to the output interface 2 according to a three-wire connection method;

[0031] The switch quantity test channel includes a digital resistance meter 5, the power supply end of the digital resistance meter 5 is connected to the lithium battery pack, and the input end is connected to the switch quantity analog quantity test interface 6;

[0032] The analog quantity test channel comprises a digital ammeter 7 , a power supply end of the digital ammeter 7 is connected to a lithium battery pack, and an input end of the digital ammeter 7 is connected to a switch quantity analog quantity test interface 6 .

[0033] In the embodiment of the present application, the number of temperature sampling channels, temperature simulation channels, switch value test channels and analog value test channels can be set as needed. The temperature sampling channel includes a plurality of parallel precision sampling resistors, and the sampling values ​​of different temperatures are provided by the plurality of parallel precision sampling resistors. The temperature channel sampling value verification of the temperature instrument can be realized through the temperature sampling channel, and the switching of the precision sampling resistors of different resistance values ​​is realized through the sampling value switch 1. It can be understood that one sampling value switch 1 is in the on state, and the other sampling value switches 1 are in the off state, and the action value switch 4 is in the off state. The temperature change is simulated by adjusting the resistance value of the precision adjustable potentiometer 3 of the temperature simulation channel, and the temperature channel fixed value verification of the temperature instrument can be realized through the temperature simulation channel. The conduction and disconnection of the temperature simulation channel are controlled by the action value switch 4. It can be understood that when the action value switch 4 is in the on state, it is necessary to ensure that the sampling value switch 1 is in the off state. The digital resistance meter 5 of the switch value test channel measures the switch value output of the temperature instrument, and the switch value can be measured through the switch value test channel to realize the switch value output test of the temperature instrument. The analog output of the temperature meter is measured through the digital ammeter 7 of the analog test channel. The analog quantity can be measured through the analog test channel, and the analog output test of the temperature meter can be realized through the analog test channel, which can greatly improve the work efficiency of the temperature meter calibration.

[0034] Embodiment 2

[0035] On the basis of the first embodiment, it includes a device housing 8, the precision sampling resistor and the lithium battery pack are arranged in the device housing 8, and the sampling value switch 1, the output interface 2, the precision adjustable potentiometer 3, the action value switch 4, the digital resistance meter 5, the digital ammeter 7 and the switch quantity analog quantity test interface 6 are all arranged on the device housing 8.

[0036] In the embodiment of the present application, the precision sampling resistor, lithium battery pack, sampling value switch 1, output interface 2, precision adjustable potentiometer 3, action value switch 4, digital resistance meter 5, digital ammeter 7 and switch quantity analog quantity test interface 6 are brought together through the device housing 8, so that it is convenient to carry through the device housing 8.

[0037] Embodiment 3

[0038] On the basis of the second embodiment, a power switch AN9 is provided between the lithium battery pack and the digital ohmmeter 5 and the digital ammeter 7 , and the lithium battery pack is provided with a charging port 10 . The power switch AN9 and the charging port 10 are arranged on the device housing 8 .

[0039] In the embodiment of the present application, the power switch AN9 is used as the working power switch of the digital ammeter 7 and the digital resistance meter 5, and the start and stop of the digital ammeter 7 and the digital resistance meter 5 can be controlled by the power switch AN9. A charging port 10 is provided for the lithium battery pack, and the lithium battery pack can be charged through the charging port 10.

[0040] Embodiment 4

[0041] On the basis of the first embodiment, Figure 2 , Figure 3 As shown, there are four groups of temperature sampling channels, each group of temperature sampling channels includes sixteen precision sampling resistors, and the resistance values ​​of the sixteen precision sampling resistors of temperature sampling channels in different groups are the same. There are four groups of temperature simulation channels, five groups of switch quantity test channels, and three groups of analog quantity test channels; the sampling value switch 1 is a three-speed switching switch, and the contacts corresponding to the "1" gear of each sampling value switch 1 are respectively connected to a precision sampling resistor with the same resistance value of the four groups of temperature sampling channels, and the contacts corresponding to the "2" gear are respectively connected to another precision sampling resistor with the same resistance value of the four groups of temperature sampling channels, and the precision sampling resistors connected to each sampling value switch 1 are different; the action value switch 4 is a three-speed switching switch, and the contacts corresponding to the "1" gear of the action value switch 4 are respectively connected in series with the precision adjustable potentiometers 3 of the four groups of temperature simulation channels; the output interface 2 includes a DB25 base, a DB15 base and a DB9 base, and the first group of temperature sampling channels and the first group of temperature simulation One end of the channel is connected to the 1st pin of the DB25 base, DB15 base, and DB9 base, and the other end is connected to the 9th and 14th pins of the DB25 base, the 6th and 9th pins of the DB15 base, and the 2nd and 7th pins of the DB9 base; one end of the second group of temperature sampling channels and the second group of temperature simulation channels is connected to the 2nd pin of the DB25 base, the 3rd pin of the DB9 base, and the other end is connected to the 10th and 15th pins of the DB25 base, the 7th and 10th pins of the DB15 base. Pin 1, Pin 2, Pin 3 of DB9 base; one end of the third group of temperature sampling channels and the third group of temperature simulation channels are connected to Pin 3 of DB25 base and DB15 base, Pin 5 of DB9 base, and the other end are connected to Pin 11 and Pin 16 of DB25 base, Pin 8 and Pin 11 of DB15 base, and Pin 6 and Pin 9 of DB9 base; one end of the fourth group of temperature sampling channels and temperature simulation channels are connected to Pin 4 of DB25 base, and the other end are connected to Pin 17 and Pin 23 of DB25 base;

[0042] In the embodiment of the present application, the sixteen precision sampling resistors of each group of temperature sampling channels can provide sampling values ​​of -30°C, 0°C, 20°C, 40°C, 50°C, 60°C, 80°C, 100°C, 120°C, 140°C, 150°C, 160°C, 200°C, 240°C, 300°C, 400°C, and 500°C. The temperature adjustment range of the precision adjustable potentiometer 3 of each group of temperature simulation channels is -200°C to 260°C. The sixteen precision sampling resistors of the four groups of temperature sampling channels are R1-1-R1-16, R2-1-R2-16, R3-1-R3-16, and R4-1-R4-16, and the precision adjustable potentiometers of the four groups of temperature simulation channels are RT1-RT4. The digital resistance meter 5 of the five groups of switch quantity test channels is R1-R5, and the digital ammeter 7 of the three groups of analog quantity test channels is A1-A3. The sampling value switch 1 is composed of eight three-speed switching switches, which are recorded as sampling value switches 1-8. The action value switch 4 is composed of one three-speed switching switch. The internal nodes of the sampling value switch 1 are shown in Table 1.

[0043] Table 1 Internal contacts of the switch (sampling value switch)

[0044]

[0045] When the sampling value switch 1 and the action value switch 4 are respectively turned to the "1" and "2" positions, four pairs of contacts are connected. When they are turned to the "0" position, all contacts are not connected. When the sampling value switch 1 is turned to the "1" position, there are 4 -30℃ temperature outputs, and when it is turned to the "2" position, there are 4 0℃ temperature outputs. When the sampling value switch 2 is turned to the "1" position, there are 4 20℃ temperature outputs, and when it is turned to the "2" position, there are 4 40℃ temperature outputs. When the sampling value switch 3 is turned to the "1" position, there are 4 50℃ temperature outputs, and when it is turned to the "2" position, there are 4 60℃ temperature outputs. When the sampling value switch 4 is turned to the "1" position, there are 4 80℃ temperature outputs, and when it is turned to the "2" position, there are 4 100℃ temperature outputs. When the sampling value switch 5 is turned to the "1" position, there are 4 temperature outputs of 120℃, and when it is turned to the "2" position, there are 4 temperature outputs of 150℃. When the sampling value switch 6 is turned to the "1" position, there are 4 temperature outputs of 160℃, and when it is turned to the "2" position, there are 4 temperature outputs of 200℃. When the sampling value switch 7 is turned to the "1" position, there are 4 temperature outputs of 240℃, and when it is turned to the "2" position, there are 4 temperature outputs of 300℃. When the sampling value switch 8 is turned to the "1" position, there are 4 temperature outputs of 400℃, and when it is turned to the "2" position, there are 4 temperature outputs of 500℃. When the action value switch 4 is turned to the "1" position, there are 4 temperature outputs adjustable in the range of (-200~260)℃, and the "2" position is idle and not used.

[0046] Wiring of the first channel of sampling value and action value:

[0047] Precision sampling resistors R1-1-R1-16 and pin 1 of precision adjustable potentiometer RT1 are connected in parallel and connected to pin 1 of DB25, DB15, and DB9 respectively. Pin 2 of precision sampling resistors R1-1, R1-3, R1-5, R1-7, R1-9, R1-11, R1-13, R1-15, and precision adjustable potentiometer RT1 are connected to pin 1 of sampling value switch 1-8 and action value switch 4 respectively. Pin 2 of precision sampling resistors R1-2, R1-4, R1-6, R1-8, R1-10, R1-12, R1-14, and R1-16 are connected to pin 3 of sampling value switch 1-8 respectively. Pin 2 and pin 4 of sampling value switch 1-8 and pin 2 of action value switch 4 are connected in parallel and connected to pin 9 and pin 14 of DB25, pin 6 and pin 9 of DB15, and pin 2 and pin 7 of DB9 respectively.

[0048] Sampling value, action value second channel wiring:

[0049] The precision sampling resistors R2-1-R2-16 and the pin 1 of the precision adjustable potentiometer RT2 are connected in parallel and connected to the pin 2 of DB25, DB15, and the pin 3 of DB9. The pin 2 of the precision sampling resistors R2-1, R2-3, R2-5, R2-7, R2-9, R2-11, R2-13, R2-15, and the precision adjustable potentiometer RT2 are connected to the pin 5 of the sampling value switch 1-8 and the action value switch 4. The pin 2 of the precision sampling resistors R2-2, R2-4, R2-6, R2-8, R2-10, R2-12, R2-14, and R2-16 are connected to the pin 7 of the sampling value switch 1-8. The pins 6 and 8 of the sampling value switch 1-8 and the pin 6 of the action value switch 4 are connected in parallel and connected to the pins 10 and 15 of DB25, the pins 7 and 10 of DB15, and the pins 4 and 8 of DB9.

[0050] Wiring of the third channel of sampling value and action value:

[0051] Precision sampling resistors R3-1-R3-16) and pin 1 of precision adjustable potentiometer RT3 are connected in parallel to pin 3 of DB25, DB15, and pin 5 of DB9. Pin 2 of precision sampling resistors R3-1, R3-3, R3-5, R3-7, R3-9, R3-11, R3-13, R3-15, and precision adjustable potentiometer RT3 are connected to pin 9 of sampling value switch 1-8 and action value switch 4 respectively. Pin 2 of precision sampling resistors R3-2, R3-4, R3-6, R3-8, R3-10, R3-12, R3-14, and R3-16 are connected to pin 11 of sampling value switch 1-8 respectively. The 10th and 12th pins of the sampling value switches 1-8 and the 10th pin of the action value switch 4 are connected in parallel and are respectively connected to the 11th and 16th pins of the DB25, the 8th and 11th pins of the DB15, and the 6th and 9th pins of the DB9.

[0052] Sampling value, action value fourth channel wiring:

[0053] Precision sampling resistors R4-1-R4-16 and pin 1 of precision adjustable potentiometer RT4 are connected in parallel and then connected to pin 4 of DB25. Pin 2 of precision sampling resistors R4-1, R4-3, R4-5, R4-7, R4-9, R4-11, R4-13, R4-15, and RT4 are connected to pin 13 of sampling value switch 1-8 and action value switch 4 respectively. Pin 2 of precision sampling resistors R4-2, R4-4, R4-6, R4-8, R4-10, R4-12, R4-14, and R4-16 are connected to pin 15 of sampling value switch 1-8 respectively. Pins 14 and 16 of sampling value switch 1-8 and pin 14 of action value switch 4 are connected in parallel and then connected to pins 17 and 23 of DB25.

[0054] Terminal 1 of digital resistance meter R1-R5 is connected to terminal 2 of power switch AN9, and terminal 1 of power switch AN9 is connected to the “+” pole of lithium battery pack; terminal 2 of digital resistance meter R1-R5 is connected to terminal 4 of power switch AN9, and terminal 3 of power switch AN9 is connected to the “-” pole of lithium battery pack. Terminal 3 of digital resistance meter R1 is connected to terminal 1 of switch analog quantity test interface 6, and terminal 4 of digital resistance meter R1 is connected to terminal 2 of switch analog quantity test interface 6. Terminal 3 of digital resistance meter R2 is connected to terminal 3 of switch analog quantity test interface 6, and terminal 4 of digital resistance meter R2 is connected to terminal 4 of switch analog quantity test interface 6. Terminal 3 of digital resistance meter R3 is connected to terminal 5 of switch analog quantity test interface 6, and terminal 4 of digital resistance meter R3 is connected to terminal 6 of switch analog quantity test interface 6. Terminal 3 of the digital resistance meter R4 is connected to terminal 7 of the switch analog test interface 6, and terminal 4 of the digital resistance meter R4 is connected to terminal 8 of the switch analog test interface 6. Terminal 3 of the digital resistance meter R5 is connected to terminal 9 of the switch analog test interface 6, and terminal 4 of the digital resistance meter R5 is connected to terminal 10 of the switch analog test interface 6.

[0055] Terminal 1 of digital ammeters A1-A3 are all connected to terminal 2 of power switch AN9, and terminal 1 of power switch AN9 is connected to the "+" pole of lithium battery pack; terminal 2 of digital ammeters A1-A3 are all connected to terminal 4 of power switch AN9, and terminal 3 of power switch AN9 is connected to the "-" pole of lithium battery pack. Terminal 3 of digital ammeter A1 is connected to terminal 11 of switch analog test interface 6, and terminal 4 of digital ammeter A1 is connected to terminal 12 of switch analog test interface 6. Terminal 3 of digital ammeter A2 is connected to terminal 13 of switch analog test interface 6, and terminal 4 of digital ammeter A2 is connected to terminal 14 of switch analog test interface 6. Terminal 3 of digital ammeter A3 is connected to terminal 15 of switch analog test interface 6, and terminal 4 of digital ammeter A3 is connected to terminal 16 of switch analog test interface 6.

[0056] In summary, it can output four temperature sampling channels at the same time, among which each temperature sampling channel can output -30℃, 0℃, 20℃, 40℃, 50℃, 60℃, 80℃, 100℃, 120℃, 140℃, 150℃, 160℃, 200℃, 240℃, 300℃, 400℃, and 500℃ temperatures, so as to realize the sampling value calibration of the four temperature channels of the temperature instrument; it can output four temperatures with an adjustable range of (-200~260)℃, so as to realize the fixed value calibration of the four temperature channels of the temperature instrument; it can measure five switch quantities, so as to realize the five switch quantity output test of the temperature instrument; it can measure three DC (0-±70)mA currents, so as to realize the three analog quantity output test of the temperature instrument.

[0057] Although the specific implementation of the utility model is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A temperature instrument comprehensive tester, characterized in that: It includes at least one group of temperature sampling channels, at least one group of temperature simulation channels, at least one group of switch quantity test channels and at least one group of analog quantity test channels; The temperature sampling channel includes a plurality of precision sampling resistors connected in parallel, each precision sampling resistor has a different resistance value, each precision sampling resistor is connected in series with a sampling value switch contact, and both ends of the temperature sampling channel are connected to the output interface according to a three-wire connection method; The temperature simulation channel includes a precision adjustable potentiometer, the precision adjustable potentiometer is connected in series with an action value switch contact, and both ends of the temperature simulation channel are connected to the output interface according to a three-wire connection method; The switch quantity test channel includes a digital resistance meter, the power supply end of the digital resistance meter is connected to the lithium battery pack, and the input end is connected to the switch quantity analog quantity test interface; The analog quantity test channel comprises a digital ammeter, a power supply end of the digital ammeter is connected to a lithium battery pack, and an input end of the digital ammeter is connected to a switch quantity analog quantity test interface.

2. A temperature meter comprehensive tester according to claim 1, characterized in that: It includes a device shell, the precision sampling resistor and the lithium battery pack are arranged in the device shell, and the sampling value switch, output interface, precision adjustable potentiometer, action value switch, digital resistance meter, digital ammeter and switch quantity analog quantity test interface are all arranged on the device shell.

3. A temperature meter comprehensive tester according to claim 2, characterized in that: A power switch AN is arranged between the lithium battery pack and the digital resistance meter and the digital ammeter. The lithium battery pack is provided with a charging port. The power switch AN and the charging port are arranged on the device housing.

4. A temperature instrument comprehensive tester according to claim 1, characterized in that: There are four groups of temperature sampling channels, each group of temperature sampling channels includes sixteen precision sampling resistors, and the resistance values ​​of the sixteen precision sampling resistors of temperature sampling channels in different groups are the same. There are four groups of temperature simulation channels, five groups of switch quantity test channels, and three groups of analog quantity test channels.

5. A temperature meter comprehensive tester according to claim 4, characterized in that: The sampling value switch is a three-speed switching switch, and the contacts corresponding to the "1" position of each sampling value switch are respectively connected to a precision sampling resistor with the same resistance value as the four groups of temperature sampling channels, and the contacts corresponding to the "2" position are respectively connected to another precision sampling resistor with the same resistance value as the four groups of temperature sampling channels, and the precision sampling resistors connected to each sampling value switch are different; the action value switch is a three-speed switching switch, and the contacts corresponding to the "1" position of the action value switch are respectively connected in series with the precision adjustable potentiometers of the four groups of temperature simulation channels.

6. A temperature meter comprehensive tester according to claim 4, characterized in that: The output interface includes a DB25 base, a DB15 base and a DB9 base, one end of the first group of temperature sampling channels and the first group of temperature simulation channels are respectively connected to the 1st pin of the DB25 base, the DB15 base and the DB9 base, and the other end is respectively connected to the 9th pin and the 14th pin of the DB25 base, the 6th pin and the 9th pin of the DB15 base, and the 2nd pin and the 7th pin of the DB9 base; One end of the second group of temperature sampling channels and the second group of temperature simulation channels are connected to the 2nd pin of the DB25 base and the DB15 base, and the 3rd pin of the DB9 base, and the other end are connected to the 10th pin and the 15th pin of the DB25 base, the 7th pin and the 10th pin of the DB15 base, and the 4th pin and the 8th pin of the DB9 base; one end of the third group of temperature sampling channels and the third group of temperature simulation channels are connected to the 3rd pin of the DB25 base and the DB15 base, and the 5th pin of the DB9 base, and the other end are connected to the 11th pin and the 16th pin of the DB25 base, the 8th pin and the 11th pin of the DB15 base, and the 6th pin and the 9th pin of the DB9 base; One end of the fourth group of temperature sampling channels and temperature simulation channels is connected to pin 4 of the DB25 base, and the other end is connected to pins 17 and 23 of the DB25 base.

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