CN102322978B - Automatic calibrating device and method for temperature measuring channel of acquisition device in weather station - Google Patents
Automatic calibrating device and method for temperature measuring channel of acquisition device in weather station Download PDFInfo
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- CN102322978B CN102322978B CN 201110166352 CN201110166352A CN102322978B CN 102322978 B CN102322978 B CN 102322978B CN 201110166352 CN201110166352 CN 201110166352 CN 201110166352 A CN201110166352 A CN 201110166352A CN 102322978 B CN102322978 B CN 102322978B
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Abstract
The invention relates to an automatic calibrating device and method for a temperature measuring channel of an acquisition device in a weather station, belonging to the technical field of detection of instruments and meters. The calibrating device disclosed by the invention is combined with a resistance circuit and a four-wire system resistance circuit. The method disclosed by the invention comprises the following steps of: controlling the on/off of the acquisition device and the four-wire system resistance circuit accessed to a relay according to the resistance set by a user and realizing the switch between the four-wire system resistance circuit and an acquisition device measuring circuit through a controller; displaying the measuring result of the four-wire system resistance circuit, converting the measured resistance into a temperature value and displaying the temperature value through the controller; and finally, controlling the relay to abut the acquisition device with the resistance circuit, realizing the calibrating measurement of the acquisition device and comparing a measuring value of the acquisition device with a display value output by the controller through the controller to obtain a calibrating error. According to the device and the method disclosed by the invention, the output resistance is accurately measured in a real time; the deviation between an actual output value and a nominal value of the resistance is greatly reduced; the influence from the temperature drift of the resistance and the contact between the relay and the resistance is eliminated; and the calibrating requirement of the acquisition device is completely met.
Description
Technical field
The present invention relates to a kind of calibrating device for temperature measuring passage of collector of automatic weather station and calibration method, belong to instrument and meter and detection technique field.
Background technology
Be distributed throughout the country at present, there are several ten thousand automatic weather stations on the ground such as high mountain, island, desert and borderland, are used for the meteorological element real-time automatic collecting to various places, and wherein temperature is one of most important meteorological element that needs measurement.Automatic weather station is comprised of sensor and collector, and wherein sensor for measuring temperature adopts platinum resistance (PT100) usually, and collector is measured the platinum resistance resistance with the resistance temperature variation, obtains temperature according to minute kilsyth basalt of platinum resistance.Therefore, the accurate measurement of platinum resistance resistance is the key factor that temperature is accurately measured.But along with the resistance measuring circuit of the variation collector inside of collector environment for use and time unavoidably can change, thereby bring error to temperature survey.Therefore, need to the collector periodic verification, assess its error change.
The method of calibrating collector temperature measuring channel is the fixed resistance of external different resistances in turn on collector, and collector is measured its resistance, and compares with the nominal value of resistance, draws the thermometric error of collector.External measuring resistance is generally selected dual mode at present:
First kind of way: require to choose the high precision precision resistance (such as 80.31 Ω, 100 Ω, 119.40 Ω etc.) of a plurality of different resistances according to meteorology, according to user selection, export different resistance resistance with relay switch.The shortcoming of this mode is: the precision of the precision resistance that can select at present can only arrive ± 100m Ω, and has temperature to float phenomenon, and Meteorological Field requires resistance precision to be ± 30m Ω.In addition, the contact resistance that the relay of switching usefulness itself also has tens m Ω not wait, so this kind mode can't satisfy China Meteorological Administration to the requirement of collector calibrating.
The second way: select the active pull-up simulation to produce different resistance values.This quasi-instrument is all arranged at present both at home and abroad, and the precision of output resistance can reach ± 10m Ω, satisfies meteorological upper requirement to the calibrating resistance precision fully.But active pull-up and conventional, electric-resistance have very large difference, and the electric current that needs at least the Time Created of a few tens of milliseconds during its output resistance and necessarily require to flow through active pull-up within limits.These characteristics are so that during active pull-up access collector, some collector measuring error is very large, even the measurement data mistake.A large number of experiments show that active pull-up and great majority the professional upper collectors that use cooperate problem all arranged, can't realize normal calibrating.
Therefore, the predicament of at present collector temperature calibrating is: the precision resistance precision is inadequate when selecting the precision resistance scheme, and active pull-up can't can't cooperate with most collectors, realizes calibrating.
Summary of the invention
Technical matters to be solved by this invention is the deficiency for the above-mentioned background technology, and a kind of calibrating device for temperature measuring passage of collector of automatic weather station and calibration method are provided.
The present invention adopts following technical scheme for achieving the above object:
A kind of calibrating device for temperature measuring passage of collector of automatic weather station comprises collector, first to fourth cut-in relay, resistance circuit, four-wire system resistance measuring circuit, the 5th to the 8th cut-in relay, MCU controller;
Wherein, four of collector connection terminals are connected with the input end of first to fourth cut-in relay respectively;
The input end of resistance circuit is connected with the output terminal, the 5th of first, second cut-in relay, the input end of the 6th cut-in relay respectively;
The output terminal of resistance circuit is connected with the output terminal, the 7th of the 3rd, the 4th cut-in relay, the input end of the 8th cut-in relay respectively;
The output terminal of the 5th to the 8th cut-in relay is connected with the input end of four-wire system resistance measuring circuit respectively;
The output terminal of resistance circuit, four-wire system resistance measuring circuit is connected with the MCU controller by communication interface respectively;
Described resistance circuit comprises N resistance and N the relay gate corresponding with resistance, wherein, the input end of the output terminal of each resistance and the relay gate corresponding with it connects, and the input end of N resistance relay gate also connects, the output terminal of N resistance also connects, and N is positive integer.
In the described calibrating device for temperature measuring passage of collector of automatic weather station, described N is the positive integer less than or equal to 10.
A kind of temperature measuring passage of collector of automatic weather station calibration method comprises the steps:
Step 1: the user need to select the resistance value of output by the MCU controller, adopts MCU controller control relay gate closed;
Step 2: adopt four cut-in relay closures of MCU controller control four-wire system resistance measuring circuit, adopt four-wire system resistance measuring circuit measuring resistance circuit, obtain resistance as output resistance;
Step 3: adopt the MCU controller that output resistance is converted to temperature value, and show output resistance and temperature value;
Step 4: adopt four cut-in relays disconnections of MCU controller control four-wire system resistance measuring circuit, four cut-in relay closures of collector;
Step 5: adopt the resistance of collector measuring resistance circuit, realize the temperature measuring channel calibrating.
The present invention adopts technique scheme, has following beneficial effect: the resistance value real-time, that Measurement accuracy is exported, greatly reduced deviation between the real output value of resistance and the nominal value, the temperature of having eliminated simultaneously resistance is floated the impact with the relay contact resistance, satisfies collector calibrating requirement fully.
Description of drawings
Fig. 1 is the schematic diagram of acquisition device in weather station temperature channel calibrating installation of the present invention and calibration method, the number in the figure explanation, and MCU is single-chip microcomputer or other controllers, R
1～R
NN resistance, K
1～K
NBe N resistance relay gate, choosing according to Meteorological Field calibrating requirement of N is generally 10, S
1～S
4Be four cut-in relays of collector, S
5～S
8Four cut-in relays for the four-wire system resistance measuring circuit.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
A kind of calibrating device for temperature measuring passage of collector of automatic weather station comprises collector, first to fourth cut-in relay, resistance circuit, four-wire system resistance measuring circuit, the 5th to the 8th cut-in relay, MCU controller;
Wherein, four of collector connection terminals are connected with the input end of first to fourth cut-in relay respectively;
The input end of resistance circuit is connected with the output terminal, the 5th of first, second cut-in relay, the input end of the 6th cut-in relay respectively;
The output terminal of resistance circuit is connected with the output terminal, the 7th of the 3rd, the 4th cut-in relay, the input end of the 8th cut-in relay respectively;
The output terminal of the 5th to the 8th cut-in relay is connected with the input end of four-wire system resistance measuring circuit respectively;
The output terminal of resistance circuit, four-wire system resistance measuring circuit is connected with the MCU controller by communication interface respectively.
Resistance circuit has ten resistance, and resistance is arbitrary value.The input end of the output terminal of each resistance and the relay gate corresponding with it connects, and the input end of 10 relay gates also connects, and the output terminal of 10 resistance also connects.
A kind of temperature measuring passage of collector of automatic weather station calibration method comprises the steps:
Step 1: it is 100 Ω (corresponding temperature is 0 ℃) that the user selects the resistance value of output by the MCU controller, and controller control relay gate is closed;
Four cut-in relay closures of step 2:MCU controller control four-wire system resistance measuring circuit, the resistance of four-wire system resistance measuring circuit measuring resistance circuit is as output resistance, actual measured value is 99.910 Ω, and actual measured value comprises the contact resistance of resistance value and engage relay;
The step 3:MCU controller resistance value that step 2 is measured is converted to temperature value and obtains-0.24 ℃, and controller shows resistance value 99.910 Ω and temperature value-0.24 ℃;
Four cut-in relays of step 4:MCU controller control four-wire system resistance measuring circuit disconnect four cut-in relay closures of collector;
Step 5: the resistance of collector measuring resistance circuit is 100.30 Ω, and corresponding temperature is 0.76 ℃.Calculate the collector gauging error, obtaining resistance error is 390m Ω, and the corresponding temperature error is 1 ℃.
Claims (3)
1. a calibrating device for temperature measuring passage of collector of automatic weather station is characterized in that, comprises collector, first to fourth cut-in relay, resistance circuit, four-wire system resistance measuring circuit, the 5th to the 8th cut-in relay, MCU controller;
Wherein, four of collector connection terminals are connected with the input end of first to fourth cut-in relay respectively;
The input end of resistance circuit is connected with the output terminal, the 5th of first, second cut-in relay, the input end of the 6th cut-in relay respectively;
The output terminal of resistance circuit is connected with the output terminal, the 7th of the 3rd, the 4th cut-in relay, the input end of the 8th cut-in relay respectively;
The output terminal of the 5th to the 8th cut-in relay is connected with the input end of four-wire system resistance measuring circuit respectively;
The output terminal of resistance circuit, four-wire system resistance measuring circuit is connected with the MCU controller by communication interface respectively;
Described resistance circuit comprises N resistance and N the relay gate corresponding with resistance, wherein, the input end of the output terminal of each resistance and the relay gate corresponding with it connects, and the input end of N resistance relay gate also connects, the output terminal of N resistance also connects, and N is positive integer.
2. calibrating device for temperature measuring passage of collector of automatic weather station according to claim 1 is characterized in that, described N is the positive integer less than or equal to 10.
3. a temperature measuring passage of collector of automatic weather station calibration method is characterized in that, comprises the steps:
Step 1: the user need to select the resistance value of output by the MCU controller, adopts MCU controller control relay gate closed;
Step 2: adopt four cut-in relay closures of MCU controller control four-wire system resistance measuring circuit, adopt four-wire system resistance measuring circuit measuring resistance circuit, obtain resistance as the actual measured value of output resistance;
Step 3: adopt the MCU controller that output resistance is converted to temperature value, and show actual measured value and the temperature value of output resistance;
Step 4: adopt four cut-in relays disconnections of MCU controller control four-wire system resistance measuring circuit, four cut-in relay closures of collector;
Step 5: adopt the resistance of collector measuring resistance circuit, calculate the collector gauging error, realize the temperature measuring channel calibrating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110166352 CN102322978B (en) | 2011-06-20 | 2011-06-20 | Automatic calibrating device and method for temperature measuring channel of acquisition device in weather station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110166352 CN102322978B (en) | 2011-06-20 | 2011-06-20 | Automatic calibrating device and method for temperature measuring channel of acquisition device in weather station |
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| CN102322978A CN102322978A (en) | 2012-01-18 |
| CN102322978B true CN102322978B (en) | 2013-01-02 |
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| CN 201110166352 Expired - Fee Related CN102322978B (en) | 2011-06-20 | 2011-06-20 | Automatic calibrating device and method for temperature measuring channel of acquisition device in weather station |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106225956A (en) * | 2016-08-31 | 2016-12-14 | 芜湖天宇科技开发有限公司 | Temperature sensor multichannel resistance monitor station and detection method thereof |
| CN109269680A (en) * | 2018-11-16 | 2019-01-25 | 中环天仪（天津）气象仪器有限公司 | A kind of device and method for multichannel temperature calibrating |
| CN110780193A (en) * | 2019-11-21 | 2020-02-11 | 中电科仪器仪表有限公司 | Coaxial electromechanical switch reliability testing device and method based on contact resistance measurement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS57179758A (en) * | 1981-04-30 | 1982-11-05 | Fujitsu General Ltd | Method and device for measurement of temperature coefficient of resistance |
| US5746511A (en) * | 1996-01-03 | 1998-05-05 | Rosemount Inc. | Temperature transmitter with on-line calibration using johnson noise |
| CN2634487Y (en) * | 2003-06-03 | 2004-08-18 | 南京世纪东方电子有限责任公司 | Distribution monitoring terminal |
| CN201852951U (en) * | 2010-10-29 | 2011-06-01 | 苏州大学 | Iron tower meteorologic parameter measuring instrument |
| CN202101794U (en) * | 2011-06-20 | 2012-01-04 | 南京信息工程大学 | Calibrating device for temperature measuring passage of collector of automatic weather station |
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