CN201225931Y - Assay instrument for digital thermometer - Google Patents
Assay instrument for digital thermometer Download PDFInfo
- Publication number
- CN201225931Y CN201225931Y CNU2008200750652U CN200820075065U CN201225931Y CN 201225931 Y CN201225931 Y CN 201225931Y CN U2008200750652 U CNU2008200750652 U CN U2008200750652U CN 200820075065 U CN200820075065 U CN 200820075065U CN 201225931 Y CN201225931 Y CN 201225931Y
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- high accuracy
- instrument
- voltage table
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Abstract
The utility model discloses a digital thermometer comparator, which comprises a millivolt generator and a high-precision digital voltmeter, wherein, the direct-current millivolt generator consists of a power source, a switch and regulation resistances R1, R2 and R3; the high-precision digital voltmeter consists of an A/D converter, an electronic counter, a control logic circuit and a digital display apparatus. The comparator has simple structure, convenient measurement, direct reading, non-error in viewing, high sensitivity and wide measurement range. The comparator can be used as a standard that is used for verifying the digital display instrument with millivolt input, and can also be used for verifying the on-site on-line digital temperature instrument, and can verify and correct the digital temperature instruments with different thermocouple scale division.
Description
Technical field
The utility model belongs to a kind of tester of examining and determine digital instrument, is specifically related to a kind of digital thermometer calibrating instrument.
Technical background
At present, the moving-coil type thermometric instrument be the past industrial process measure and control system in widely used a kind of analog simple instrument, the thermopair multiple measurement of it and various calibration can indicated temperature, can also regulate functions such as temperature control, warning.In every field, brought into play great role.But it has a lot of shortcomings, and moving-coil instrument is subjected to the influence of magnet steel, magnetic material and combined machine part, has repeatability error in the indicating value, droop error, returns zero error (variation), parallax, poor stability.Complicated in mechanical structure is produced low 1.0～1.5 grades of accuracy of instrument, and maintenance difficulty is big, and shock resistance is poor, and easily because of vibration produces misoperation, measuring speed is slow, can not quick adjustment during temperature control.
In calibrating during with the moving-coil instrument of millivolt input signal (thermoelectrical potentials of various thermopair calibration), vertification regulation JJG186-1997, JJG951-2000 have stipulated that clearly standard will be with DC potentiometer, millivolt generator, DC resistance box etc. more than 0.05 grade.
As shown in Figure 1, the mode of connection of prior art calibrating digital temperature instrument is: the positive pole of tested instrument 4 is connected with an end of resistance box 3, the both positive and negative polarity of tested instrument 4 is connected with the negative pole of millivolt generator 1, the other end of resistance box 3 is connected with the positive pole of millivolt generator 1, and millivolt generator 1 positive and negative electrode is connected with the positive and negative electrode of DC potentiometer 2 respectively.
The method of prior art calibrating digital temperature instrument, shortcomings such as connection line complexity, measuring speed is slow, error is big, reading inconvenience.
Summary of the invention
The utility model proposes in order to overcome the shortcoming that exists in the prior art, and its objective is provides a kind of simple in structure, convenient reading, the digital thermometer calibrating instrument of advantage such as directly perceived, no parallax rapidly.
The technical solution of the utility model is: a kind of digital thermometer calibrating instrument, comprise direct current millivolt generator and high accuracy number voltage table, and described direct current millivolt generator is made up of power supply, switch and potentiometer R1, R2, R3; The positive pole of power supply is connected with an end of switch, the negative pole of power supply is connected with an end of high accuracy number voltage table and the end of R1 respectively, the other end of switch is connected with the other end of R1, the movable end of R1 is connected with the end of R2, the other end of R2 is connected with the negative pole of power supply and an end of high accuracy number voltage table respectively, the movable end of R2 is connected with the end of R3, and the other end of R3 is connected with the other end of high accuracy number voltage table together with movable end.Described high accuracy number voltage table is made up of A/D converter, electronic counter, control logic circuit and digital indicator.
Potentiometer R1, R2, R3 adopt variable accurate multiturn potentiometer.A/D converter adopts 24 analog to digital converters of AD7710 type.Control logic circuit adopts ATMEL89C51 type single-chip microcomputer.Digital indicator adopts 6 half LCD.
The utility model is simple in structure, measurement is convenient, reading is directly perceived, no parallax, highly sensitive, measurement range is wide.Can be used as the standard of calibrating, can also arrive the online digital temperature instrument of using of on-site proving, and can examine and determine and adjustment the digital temperature instrument of various thermopair calibration with the read out instrument of millivolt input.
Description of drawings
Fig. 1 is the wiring block scheme of prior art proving temperature table;
Fig. 2 is a composition block scheme of the present utility model;
Fig. 3 is the composition block scheme of high accuracy number voltage table;
Fig. 4 is a wiring block scheme of using the utility model proving temperature table;
Fig. 5 is a panel layout of the present utility model.
Wherein:
1 millivolt generator, 2 DC potentiometer
3 resistance boxes, 4 tested thermometers
5 direct current millivolt generators, 6 high accuracy number voltage tables
7 power supplys, 8 switches
9 A/D converters, 10 electronic counters
11 control logic circuits, 12 digital indicators
Embodiment
With embodiment digital thermometer calibrating instrument of the present utility model is elaborated with reference to the accompanying drawings:
Shown in Fig. 2,3, a kind of digital thermometer calibrating instrument comprises direct current millivolt generator 5 and high accuracy number voltage table 6.
Wherein: direct current millivolt generator 5 is made up of power supply 7, switch 8 and potentiometer R1, R2, R3, the positive pole of power supply 7 is connected with an end of switch 8, the negative pole of power supply 7 is connected with an end of high accuracy number voltage table 6 and the end of R1 respectively, and the other end of switch 8 is connected with the other end of R1.The movable end of R1 is connected with the end of R2, the other end of R2 is connected with the negative pole of power supply 7 and an end of high accuracy number voltage table 6 respectively, the movable end of R2 is connected with the end of R3, and the other end of R3 is connected with the other end of high accuracy number voltage table 6 together with movable end.
Potentiometer R1, R2, R3 adopt variable accurate multiturn potentiometer.
Wherein: high accuracy number voltage table 6 is made up of A/D converter 9, electronic counter 10, control logic circuit 11 and digital indicator 12.A/D converter 9 adopts 24 analog to digital converters of AD7710 type, and control logic circuit 11 adopts ATMEL89C51 type single-chip microcomputer, and digital indicator 12 adopts 6 half LCD.
A/D converter 9 is converted to proportional with it digital quantity with the continually varying analog quantity voltage of input, counts by electronic counter 10, and count results is shown with digital mode on digital indicator 12.Whole process is controlled by control logic circuit 11, realizes each parts co-ordination, and carries out duplicate measurements automatically.
Shown in Fig. 4,5, the both positive and negative polarity of tested thermometer 4 and the both positive and negative polarity of high accuracy number voltage table 6 are that the both positive and negative polarity of panel is connected, and the both positive and negative polarity of direct current millivolt generator 5 and the both positive and negative polarity of high accuracy number voltage table 6 are that another both positive and negative polarity of panel is connected.
Potentiometer R1, R2 parallel connection is thick, middle adjusting, and potentiometer R3 series connection is thin tuning.Regulator potentiometer R1, R2, R3, make the certain voltage signal (mV voltage) of direct current millivolt generator 5 outputs, tested thermometer 4 and high accuracy number voltage table 6 demonstrate numerical value simultaneously, two numerical value compare, again through data processing, thereby can judge the accuracy class of tested thermometer 4 or whether qualified.
The utility model can continuous adjustable output 0～100mV d. c. voltage signal, and resolving power is 1 μ V.Can examine and determine digital temperature display instrument, digital temperature adjusting apparatus of S, K, E, J equal indicative number etc. respectively.But examine and determine various Low ESR digital instruments with the direct adjustment of outputting standard signal bringing onto load, index error is ± a 0.05%+5 word.
The utility model is simple in structure, measurement is convenient, reading is directly perceived, no parallax, highly sensitive, measurement range is wide.Can be used as the standard of calibrating, can also arrive the online digital temperature instrument of using of on-site proving, and can examine and determine and adjustment the digital temperature instrument of various thermopair calibration with the read out instrument of millivolt input.
Claims (5)
1, a kind of digital thermometer calibrating instrument, comprise direct current millivolt generator (5) and high accuracy number voltage table (6), it is characterized in that: described direct current millivolt generator (5) is by power supply (7), switch (8) and potentiometer R1, R2, R3 forms, the positive pole of power supply (7) is connected with an end of switch (8), the negative pole of power supply (7) is connected with an end of high accuracy number voltage table (6) and the end of R1 respectively, the other end of switch (8) is connected with the other end of R1, the movable end of R1 is connected with the end of R2, the other end of R2 is connected with the negative pole of power supply (7) and an end of high accuracy number voltage table (6) respectively, the movable end of R2 is connected with the end of R3, and the other end of R3 is connected with the other end of high accuracy number voltage table (6) together with movable end; Described high accuracy number voltage table (6) is made up of A/D converter (9), electronic counter (10), control logic circuit (11) and digital indicator (12).
2, according to the described digital thermometer calibrating instrument of claim 1, it is characterized in that: potentiometer R1, R2, R3 adopt variable accurate multiturn potentiometer.
3, according to the described digital thermometer calibrating instrument of claim 1, it is characterized in that: A/D converter (9) adopts 24 analog to digital converters of AD7710 type.
4, according to the described digital thermometer calibrating instrument of claim 1, it is characterized in that: control logic circuit (11) adopts ATMEL89C51 type single-chip microcomputer.
5, according to the described digital thermometer calibrating instrument of claim 1, it is characterized in that: digital indicator (12) adopts 6 half LCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200750652U CN201225931Y (en) | 2008-06-19 | 2008-06-19 | Assay instrument for digital thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200750652U CN201225931Y (en) | 2008-06-19 | 2008-06-19 | Assay instrument for digital thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201225931Y true CN201225931Y (en) | 2009-04-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200750652U Expired - Fee Related CN201225931Y (en) | 2008-06-19 | 2008-06-19 | Assay instrument for digital thermometer |
Country Status (1)
| Country | Link |
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| CN (1) | CN201225931Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678336A (en) * | 2014-11-03 | 2015-06-03 | 江西通用光电应用技术研究所有限责任公司 | Resistor intelligent display module |
| CN106404224A (en) * | 2015-07-29 | 2017-02-15 | 哈尔滨飞机工业集团有限责任公司 | Tester for detecting accuracy of total temperature indicator, and method for detecting accuracy of total temperature indicator |
| CN108132111A (en) * | 2018-02-27 | 2018-06-08 | 第拖拉机股份有限公司 | Digital temperature instrument exports calibrating installation and its application method |
| CN111060146A (en) * | 2019-12-26 | 2020-04-24 | 天津津航计算技术研究所 | Automatic calibration system of multichannel AD collection equipment |
| CN114112117A (en) * | 2021-12-20 | 2022-03-01 | 江西洪都航空工业集团有限责任公司 | On-spot measurement calibrating device of temperature instrument |
-
2008
- 2008-06-19 CN CNU2008200750652U patent/CN201225931Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678336A (en) * | 2014-11-03 | 2015-06-03 | 江西通用光电应用技术研究所有限责任公司 | Resistor intelligent display module |
| CN106404224A (en) * | 2015-07-29 | 2017-02-15 | 哈尔滨飞机工业集团有限责任公司 | Tester for detecting accuracy of total temperature indicator, and method for detecting accuracy of total temperature indicator |
| CN108132111A (en) * | 2018-02-27 | 2018-06-08 | 第拖拉机股份有限公司 | Digital temperature instrument exports calibrating installation and its application method |
| CN108132111B (en) * | 2018-02-27 | 2024-01-26 | 第一拖拉机股份有限公司 | Digital temperature instrument output calibration device and use method thereof |
| CN111060146A (en) * | 2019-12-26 | 2020-04-24 | 天津津航计算技术研究所 | Automatic calibration system of multichannel AD collection equipment |
| CN114112117A (en) * | 2021-12-20 | 2022-03-01 | 江西洪都航空工业集团有限责任公司 | On-spot measurement calibrating device of temperature instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090422 Termination date: 20100619 |