CN215524882U - NTC thermistor calibration system - Google Patents
NTC thermistor calibration system Download PDFInfo
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- CN215524882U CN215524882U CN202121154243.2U CN202121154243U CN215524882U CN 215524882 U CN215524882 U CN 215524882U CN 202121154243 U CN202121154243 U CN 202121154243U CN 215524882 U CN215524882 U CN 215524882U
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- 239000004033 plastic Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
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- 238000010586 diagram Methods 0.000 description 4
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- 238000002474 experimental method Methods 0.000 description 1
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Abstract
The utility model discloses an NTC thermistor calibration system, which comprises a temperature control unit, a temperature monitoring unit, a temperature comparison unit, a measurement unit and a microprocessor, wherein the temperature control unit is used for controlling the temperature of a thermistor; the NTC thermistor to be detected is placed in the temperature control unit, and the temperature control unit adjusts the temperature of the NTC thermistor to be detected; the temperature monitoring unit and the measuring unit are connected with the NTC thermistor to be measured; the temperature comparison unit is electrically connected with the temperature monitoring unit and the measuring unit respectively; the temperature monitoring unit, the temperature comparing unit and the measuring unit are all electrically connected with the microprocessor; the temperature monitoring unit acquires the temperature of the NTC thermistor to be measured, the temperature comparison unit compares whether the acquired temperature reaches a first preset temperature or a second preset temperature, and the measurement unit measures the resistance value of the NTC thermistor to be measured. The method and the device solve the technical problems of long consumed time and large measurement error caused by using a point-by-point calibration method in the prior art, and achieve the technical effects of reducing the measurement error and saving the measurement time.
Description
Technical Field
The embodiment of the utility model relates to the technical field of resistance detection, in particular to an NTC thermistor calibration system.
Background
In the current practical application, the calibration of the NTC (Negative Temperature Coefficient) thermistor does not need high measurement accuracy, so the calibration of the thermistor usually adopts a point-by-point calibration method to measure the resistance value of the NTC thermistor at each Temperature.
However, since the NTC thermistor is very sensitive to temperature, if the NTC thermistor is calibrated point by using an experimental method, a lot of time is consumed, and the environmental temperature in the measurement process is not easy to control, which causes great interference to the measurement result, resulting in great measurement result error.
SUMMERY OF THE UTILITY MODEL
The utility model provides an NTC thermistor calibration system, which solves the technical problems of long time consumption and large measurement error caused by using a point-by-point calibration method in the prior art.
The embodiment of the utility model provides an NTC thermistor calibration system, which comprises a temperature control unit, a temperature monitoring unit, a temperature comparison unit, a measurement unit and a microprocessor, wherein the temperature control unit is used for controlling the temperature of a thermistor;
the NTC thermistor to be tested is placed in the temperature control unit, and the temperature control unit adjusts the temperature of the NTC thermistor to be tested;
the temperature monitoring unit and the measuring unit are both connected with the NTC thermistor to be measured; the temperature comparison unit is electrically connected with the temperature monitoring unit and the measuring unit respectively; the temperature monitoring unit, the temperature comparing unit and the measuring unit are all electrically connected with the microprocessor;
the temperature monitoring unit acquires the temperature of the NTC thermistor to be detected, the temperature comparison unit compares whether the acquired temperature reaches a first preset temperature or a second preset temperature, and the measurement unit measures the resistance value of the NTC thermistor to be detected.
Further, the temperature control unit comprises a water-oil constant temperature tank, a medium tank, a cover plate and an auxiliary container;
the auxiliary container penetrates through the round hole in the cover plate and extends into the medium groove, and the NTC thermistor to be tested is placed in the auxiliary container;
the cover plate and the medium groove form a sealing structure;
the medium groove is arranged in the water-oil constant temperature groove, and the upper surface of the medium groove is flush with the upper surface of the water-oil constant temperature groove.
Further, the temperature control unit also comprises a control console which is electrically connected with the water-oil constant temperature tank.
Further, the temperature control unit also comprises a heat preservation device;
the heat preservation device is arranged in the auxiliary container and wraps the NTC thermistor to be tested.
Further, the heat preservation device is a sponge.
Further, the auxiliary container is a plastic pipe or a metal pipe.
Furthermore, the temperature monitoring unit is a temperature data acquisition instrument, and a thermocouple of the temperature data acquisition instrument is attached to the NTC thermistor to be detected through a Teflon adhesive tape.
Further, the measuring unit is a multimeter.
Further, the device also comprises a data comparison unit;
the data comparison unit is electrically connected with the microprocessor.
Further, the data comparison unit comprises a graph generation module, and the graph generation module generates Excel tables from the data processed by the microprocessor.
The utility model discloses an NTC thermistor calibration system, which comprises a temperature control unit, a temperature monitoring unit, a temperature comparison unit, a measurement unit and a microprocessor, wherein the temperature control unit is used for controlling the temperature of a thermistor; the NTC thermistor to be detected is placed in the temperature control unit, and the temperature control unit adjusts the temperature of the NTC thermistor to be detected; the temperature monitoring unit and the measuring unit are connected with the NTC thermistor to be measured; the temperature comparison unit is electrically connected with the temperature monitoring unit and the measuring unit respectively; the temperature monitoring unit, the temperature comparing unit and the measuring unit are all electrically connected with the microprocessor; the temperature monitoring unit acquires the temperature of the NTC thermistor to be measured, the temperature comparison unit compares whether the acquired temperature reaches a first preset temperature or a second preset temperature, and the measurement unit measures the resistance value of the NTC thermistor to be measured. The method and the device solve the technical problems of long consumed time and large measurement error caused by using a point-by-point calibration method in the prior art, and achieve the technical effects of reducing the measurement error and saving the measurement time.
Drawings
Fig. 1 is a structural diagram of an NTC thermistor calibration system according to an embodiment of the present invention;
fig. 2 is a structural diagram of another NTC thermistor calibration system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.
Fig. 1 is a structural diagram of an NTC thermistor calibration system according to an embodiment of the present invention.
As shown in fig. 1, the NTC thermistor calibration system includes a temperature control unit 10, a temperature monitoring unit 20, a temperature comparison unit 30, a measurement unit 40, and a microprocessor 50.
The NTC thermistor 60 to be tested is placed in the temperature control unit 10, and the temperature control unit 10 adjusts the temperature of the NTC thermistor 60 to be tested; the temperature monitoring unit 20 and the measuring unit 40 are both connected with the NTC thermistor 60 to be measured; the temperature comparison unit 30 is electrically connected with the temperature monitoring unit 20 and the measurement unit 40 respectively; the temperature monitoring unit 20, the temperature comparing unit 30 and the measuring unit 40 are all electrically connected with the microprocessor 50; the temperature monitoring unit 20 acquires the temperature of the NTC thermistor 60 to be measured, the temperature comparing unit 30 compares whether the acquired temperature reaches a first preset temperature or a second preset temperature, and the measuring unit 40 measures the resistance value of the NTC thermistor 60 to be measured.
Specifically, the inspector can regulate the temperature of the temperature control unit 10 to change the temperature value of the NTC thermistor 60 to be tested disposed therein; the temperature monitoring unit 20 monitors the temperature value of the NTC thermistor 60 to be measured in real time, and sends the acquired temperature value of the NTC thermistor 60 to be measured to the temperature comparing unit 30.
The temperature comparing unit 30 compares the received temperature value with a preset temperature value, determines whether the temperature reaches a first preset temperature T1 or a second preset temperature T2, and sends a measuring signal to the measuring unit 40 when the determination result is that the temperature reaches the first preset temperature T1 and reaches the second preset temperature T2.
For illustration, the resistance value of the NTC thermistor 60 to be measured at the first preset temperature T1 is referred to as a first resistance R1, and the resistance value of the NTC thermistor 60 to be measured at the second preset temperature T2 is referred to as a second resistance R2; the temperature monitoring unit 20 transmits the first preset temperature T1 and the second preset temperature T2 to the microprocessor 50, the measuring unit 40 transmits the first resistor R1 and the second resistor R2 to the microprocessor 50, and the microprocessor 50 can calculate the resistance value of the NTC thermistor 60 to be tested in the full temperature range according to the received temperature value and the resistance value.
For example, the first preset temperature T1 may be set to 25 ℃ according to the national standard, the second preset temperature T2 may be set to 85 ℃ according to the national standard, and the microprocessor 50 may be configured according to formula B(25/85)＝[(T25×T85)/(T85-T25)] ×In(R25/R85) Calculating to obtain the thermal index B of the NTC thermistor 60 to be measured, wherein T25Denotes a first predetermined temperature of 25 ℃ and T85The second preset temperature is 85 ℃, R25Is the resistance value R of the NTC thermistor 60 to be tested at a first preset temperature of 25 DEG C85Is the resistance value of the NTC thermistor 60 to be tested at a second preset temperature of 85 ℃, B(25/85)Is a calculated thermal sensitivity index when the first preset temperature is 25 ℃ and the second preset temperature is 85 ℃.
After the calculation of the thermal sensitivity index B, R is obtained according to the formula25×eB(1/T-1/T25)And calculating the resistance value R of the NTC thermistor 60 to be tested in the whole temperature range.
Obviously, by using the NTC thermistor calibration system provided by the application, the resistance value of the NTC thermistor 60 to be measured in the full temperature range can be obtained only by measuring the resistance values of the NTC thermistor 60 to be measured at two different preset temperatures, so that the technical problems of long consumed time and large measurement error caused by using a point-by-point calibration method in the prior art are solved, and the technical effects of reducing the measurement error and saving the measurement time are achieved.
Fig. 2 is a structural diagram of another NTC thermistor calibration system according to an embodiment of the present invention.
Alternatively, as shown in fig. 2, the temperature control unit 10 includes a water-oil thermostatic bath 11, a medium bath 12, a cover plate 13, and an auxiliary container 14; the auxiliary container 14 penetrates through a circular hole in the cover plate 13 and extends into the medium groove 12, and the NTC thermistor 60 to be tested is placed in the auxiliary container 14; the cover plate 13 and the medium groove 12 form a sealing structure; the medium tank 12 is disposed in the water and oil constant temperature tank 11, and an upper surface of the medium tank 12 is flush with an upper surface of the water and oil constant temperature tank 11. Optionally, auxiliary container 14 is a plastic or metal tube.
Specifically, the NTC thermistor 60 to be tested is placed in the auxiliary container 14, the auxiliary container 14 may be a plastic tube or a metal tube, such as an iron tube, etc., and the auxiliary container 14 is used to separate the NTC thermistor 60 to be tested from the medium tank 12; the medium tank 12 is filled with a medium, and pure water or oil can be selected as the medium according to requirements at different set temperatures; the medium tank 12 is disposed in the water and oil constant temperature tank 11, and changes the temperature of the NTC thermistor 60 to be measured along with the temperature change of the water and oil constant temperature tank 11.
Optionally, as shown in fig. 2, the temperature control unit 10 further includes a temperature keeping device 16; the heat preservation device 16 is arranged in the auxiliary container 14 and wraps the NTC thermistor 60 to be tested. Optionally, the thermal insulation device 16 is a sponge.
Specifically, the NTC thermistor 60 to be tested disposed in the auxiliary container 14 is wrapped by the heat insulation device 16, the heat insulation device 16 may be a heat insulation sponge or other material that does not affect the resistance detection and can maintain the temperature of the thermistor, and the heat insulation device 16 is used to relatively stabilize the test temperature of the NTC thermistor 60 to be tested.
Optionally, as shown in fig. 2, the temperature control unit 10 further includes a console 15, and the console 15 is electrically connected to the water and oil thermostat 11.
Specifically, the console 15 includes at least one of: keys, knobs, touch display screens and the like, and inspectors adjust the temperature of the water and oil constant temperature bath 11 through the control console 15.
Optionally, the temperature monitoring unit 20 is a temperature data collector, and a thermocouple of the temperature data collector is attached to the NTC thermistor 60 to be measured through a teflon tape. Optionally, the measurement unit 40 is a multimeter.
Specifically, the temperature of the water and oil thermostatic bath 11 set by the console 15 is not necessarily consistent with the temperature value of the current NTC thermistor 60 to be measured after the medium is transferred and the ambient environment is disturbed, so that the temperature monitoring unit 20 needs to monitor the real-time temperature of the NTC thermistor 60 to be measured, and send the acquired real-time temperature to the temperature comparison unit 30, and the temperature comparison unit 30 determines whether the received real-time temperature reaches the first preset temperature or the second preset temperature, and sends a measurement signal to the measurement unit 40 when the real-time temperature of the NTC thermistor 60 to be measured reaches the first preset temperature and the second preset temperature, so that the measurement unit 40 performs resistance measurement, and thus the measurement result can be more accurate.
The temperature monitoring unit 20 can select a temperature data acquisition instrument, and a thermocouple of the temperature data acquisition instrument is tightly attached to the NTC thermistor 60 to be measured through a Teflon adhesive tape, so that the measurement precision is improved.
Optionally, as shown in fig. 2, the NTC thermistor calibration system further includes a data comparing unit 70; the data comparison unit 70 is electrically connected to the microprocessor 50.
Optionally, the data comparing unit 70 includes a graph generating module, and the graph generating module generates an Excel table from the data processed by the microprocessor.
Specifically, after the microprocessor 50 calculates the resistance value of the NTC thermistor 60 to be measured in the full temperature range according to the first resistance at the first preset temperature and the second resistance at the second preset temperature, the graph generating module in the data comparing unit 70 may generate an Excel table from the resistance value of the NTC thermistor 60 to be measured in the full temperature range, and may compare the Excel table with a preset standard resistance calibration value to determine whether the NTC thermistor 60 to be measured meets the production standard. Table 1 is an Excel table of the resistance value of the NTC thermistor 60 to be tested in the full temperature range generated by the microprocessor 50 at a certain test. Referring to table 1, the preset standard resistor calibration values have upper limit values and lower limit values at different temperatures, and the NTC thermistor 60 to be tested shown in table 1 meets the factory standards after comparison.
In the embodiment of the present invention, the resistance values of the NTC thermistor 60 to be measured at two preset temperature values are measured, referring to table 1, that is, only the upper limit value, the nominal value, the lower limit value, the NTC resistance value when the measured temperature is 25 ℃, the upper limit value, the nominal value, the lower limit value, the NTC resistance value when the measured temperature is 85 ℃, and the nominal value of the thermal sensitive index B (25/85) are filled in table 1, so as to obtain the resistance value of the NTC thermistor 60 to be measured in the full temperature range shown in table 1.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An NTC thermistor calibration system is characterized by comprising a temperature control unit, a temperature monitoring unit, a temperature comparison unit, a measurement unit and a microprocessor;
the NTC thermistor to be tested is placed in the temperature control unit, and the temperature control unit adjusts the temperature of the NTC thermistor to be tested;
the temperature monitoring unit and the measuring unit are both connected with the NTC thermistor to be measured; the temperature comparison unit is electrically connected with the temperature monitoring unit and the measuring unit respectively; the temperature monitoring unit, the temperature comparing unit and the measuring unit are all electrically connected with the microprocessor;
the temperature monitoring unit acquires the temperature of the NTC thermistor to be detected, the temperature comparison unit compares whether the acquired temperature reaches a first preset temperature or a second preset temperature, and the measurement unit measures the resistance value of the NTC thermistor to be detected.
2. The NTC thermistor calibration system according to claim 1, wherein the temperature control unit comprises a water-oil thermostatic bath, a medium bath, a cover plate and an auxiliary container;
the auxiliary container penetrates through the round hole in the cover plate and extends into the medium groove, and the NTC thermistor to be tested is placed in the auxiliary container;
the cover plate and the medium groove form a sealing structure;
the medium groove is arranged in the water-oil constant temperature groove, and the upper surface of the medium groove is flush with the upper surface of the water-oil constant temperature groove.
3. The NTC thermistor calibration system of claim 2, wherein the temperature control unit further comprises a console electrically connected to the water-oil thermostatic bath.
4. The NTC thermistor calibration system according to claim 2, characterized in that the temperature control unit further comprises a temperature keeping device;
the heat preservation device is arranged in the auxiliary container and wraps the NTC thermistor to be tested.
5. The NTC thermistor calibration system according to claim 4, characterized in that the heat-retaining device is a sponge.
6. The NTC thermistor calibration system according to claim 2, characterized in that the auxiliary container is a plastic or metal tube.
7. The NTC thermistor calibration system according to claim 1, wherein the temperature monitoring unit is a temperature data collector, and a thermocouple of the temperature data collector is attached to the NTC thermistor to be tested by a Teflon tape.
8. The NTC thermistor calibration system according to claim 1, characterized in that the measurement unit is a multimeter.
9. The NTC thermistor calibration system according to claim 1, further comprising a data comparison unit;
the data comparison unit is electrically connected with the microprocessor.
10. The NTC thermistor calibration system according to claim 9, wherein the data comparison unit includes a graph generation module, and the graph generation module generates Excel table from the data processed by the microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121154243.2U CN215524882U (en) | 2021-05-26 | 2021-05-26 | NTC thermistor calibration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121154243.2U CN215524882U (en) | 2021-05-26 | 2021-05-26 | NTC thermistor calibration system |
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| Publication Number | Publication Date |
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| CN215524882U true CN215524882U (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121154243.2U Active CN215524882U (en) | 2021-05-26 | 2021-05-26 | NTC thermistor calibration system |
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| CN (1) | CN215524882U (en) |
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- 2021-05-26 CN CN202121154243.2U patent/CN215524882U/en active Active
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