CN104678176A - Comprehensive resistance and moisture tester and environmental temperature and humidity calibration instrument - Google Patents
Comprehensive resistance and moisture tester and environmental temperature and humidity calibration instrument Download PDFInfo
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- CN104678176A CN104678176A CN201510082660.3A CN201510082660A CN104678176A CN 104678176 A CN104678176 A CN 104678176A CN 201510082660 A CN201510082660 A CN 201510082660A CN 104678176 A CN104678176 A CN 104678176A
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Abstract
The invention relates to a comprehensive resistance and moisture tester and environmental temperature and humidity calibration instrument which is provided with a main case, wherein a power socket is arranged on the main case, and connected with a constant current source; the constant current source is connected with a standard direct current resistance box; the standard direct current resistance box is connected with a resistance regulation knob, a resistance change-over switch, a moisture tester resistance calibration change-over switch, a voltmeter, a power switch and a resistance compensation port on the main case respectively; the moisture tester resistance calibration change-over switch is connected with a tested resistance interface and a moisture sensor port; the power socket is connected with a temperature and humidity signal conversion circuit board; and the temperature and humidity signal conversion circuit board is connected with a temperature sensor interface, a humidity sensor interface, a temperature and humidity display screen and a temperature and humidity power switch on the main case. The instrument is convenient to use and wide in application scope, simplifies a calibration process, shortens the calibration time by above two times, improves the working efficiency by above 60%, improves the accuracy by above 50%, and controls an error rate to be within 0.1%.
Description
Technical field
The present invention relates to a kind of determination of moisture equipment, particularly relate to a kind of effective DC resistance is carried out and test the overall calibration instrument verifying, Corn Moisture Apparatus is examined and determine, environmental test equipment humiture is calibrated.
Background technology
Direct current resistance is in enterprise, school and R&D institution, be applied in DC circuit or electronic circuit, as impedor, the bridge arm unit of precision, or the instruments such as centering megohm bridge, megohmmeter, Insulation Resistance Tester carry out the use of complete machine verification, having easy to use and widely used feature, is important measurement instrument ingredient.The whether accurate effect being directly connected to use of resistance, therefore applying unit is necessary regularly to carry out self testing according to JJG982-2003 " DC resistance box vertification regulation ", verify or send the periodic calibration of measurement technology mechanism.
Resistor type cereal moisture teller is widely used in the industries such as grain purchases, processing, storage, the quality of direct relation grain and value of goods.According to relevant regulations such as China's " measurement Law ": the grain moisture content analyser for trade settlement belongs to the measurement instrument of compulsory verification.The national metrological verification regulations of present metering validation activity calibrating resistor type cereal moisture teller institutes at different levels foundation is JJG891-1995 " capacitance method and electric-resistivity method Corn Moisture Apparatus vertification regulation " and JJG658-2010 " oven drying method Corn Moisture Apparatus vertification regulation ".In the daily verification process of actual electrical resistive Corn Moisture Apparatus, during according to above-mentioned vertification regulation calibrating resistor type cereal moisture teller, more loaded down with trivial details, also more time-consuming, affect comparatively large by the skill level of manual operation and the accuracy of experiments supporting equipment by oven drying method, error range is 10-15% simultaneously.
Environmental test equipment is the testing equipment of simulating one or more variable environment in laboratory by artificial means.The result of the correctness of environmental test equipment temperature, psychrometry performance, accuracy and reliability direct relation environmental test equipment overall performance and environmental test.Therefore be necessary according to JJF1101-2003 " environmental test equipment temperature, humidity calibration specification ", the temperature of environmental test equipment, psychometric performance to be carried out to self calibration or sent the periodic calibration of measurement technology mechanism in routine use process as the applying unit of environmental test equipment.
Existing carry out testing to DC resistance verify, Corn Moisture Apparatus examined and determine, the instrument calibrated environmental test equipment humiture is all independent, uses very inconvenient.Be necessary to develop a kind of overall calibration instrument, both can have realized testing direct current resistance, can examine and determine Corn Moisture Apparatus (resistance-type) again, the comprehensive calibrator simultaneously can calibrated environmental test equipment humiture performance again.
Summary of the invention
Technical matters to be solved by this invention is, the technical scheme of a kind of resistance, moisture teller and ambient temperature and humidity comprehensive calibrator is provided for prior art Shortcomings, adopt the comprehensive calibrator of this technical scheme to resistance, grain moisture measures, the program of environmental test equipment temperature checking is simple, save time, improve accuracy rate, reach accurate object fast.
The present invention realizes like this, a kind of resistance, moisture teller and ambient temperature and humidity comprehensive calibrator, it is characterized in that, it has mainframe box, mainframe box is provided with outlet, outlet connects with constant current source, constant current source connects with standard DC resistance box, standard DC resistance box respectively with the resistance adjustment knob on mainframe box, resistance switch, moisture teller resistance verification switch, voltage table, power switch, resnstance transformer port connects, moisture teller resistance verification switch and measured resistance interface, moisture transducer port is connected, outlet is also connected with temperature-humidity signal change-over circuit plate, temperature sensor interface on temperature-humidity signal change-over circuit plate and mainframe box, humidity sensor interface, temperature and humidity display, humiture power switch connects.
Constant current source adjusting knob, constant current source indicator gauge described constant current source be equipped with.
Described moisture transducer port is equipped with moisture transducer multiplex roles.
Described outlet connects external power supply.
Described constant current source is high precise current source.
The invention has the beneficial effects as follows: (1) is easy to use and have wide range of applications.Can effectively simply and easily the resistance in DC circuit or electronic circuit be verified or be calibrated.Can use as the measurement standard of measurement technology mechanism again simultaneously, carry out calibrating or the calibration operation of direct current resistance, the temperature of environmental test equipment, psychrometry performance are calibrated and tested, the indispensable measure control utensil of environmental test equipment temperature, psychometric performance can be judged as enterprise and R&D institution voluntarily.(2) verification process is simplified.Shorten the calibrating used time more than 2 times, increase work efficiency more than 60%.Be the ideal metrological standard unit that legal measurement technology mechanism carries out Corn Moisture Apparatus (resistance-type) and examines and determine, be also grain purchases simultaneously, desirable measurement instrument that processing, storage industry are examined and determine voluntarily or calibrated.(3) degree of accuracy is high, good stability.Degree of accuracy improves more than 50%, and error rate controls within 0.1%.(4) compact conformation, easy to carry, easy to operate, low cost of manufacture.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic front view of the present invention;
Wherein, 1-standard DC resistance box, 2-resistance adjustment knob, 3-resistance switch, 4-moisture teller resistance verification switch, 5-measured resistance interface, 6-moisture transducer port, 7-moisture transducer multiplex roles, 8-constant current source indicator gauge, 9-outlet, 10-temperature-humidity signal change-over circuit plate, 11-temperature sensor interface, 12-temperature sensor, 13-humidity sensor interface, 14-humidity sensor, 15-temperature and humidity display, 16-humiture power switch, 17-external power supply, 18-constant current source, 19-constant current source adjusting knob, 20-voltage table, 21-power switch, 22-resnstance transformer port, 23-mainframe box.
Embodiment
Provide embodiment below in conjunction with accompanying drawing, concrete structure of the present invention and principle of work are described.
As shown in Figure 1, a kind of resistance of the present invention, moisture teller and ambient temperature and humidity comprehensive calibrator, it is characterized in that, it has mainframe box 23, mainframe box 23 is provided with outlet 9, outlet 9 connects with constant current source 18, constant current source 18 connects with standard DC resistance box 1, standard DC resistance box 1 respectively with the resistance adjustment knob 2 on mainframe box 23, resistance switch 3, moisture teller resistance verification switch 4, voltage table 20, power switch 21, resnstance transformer port 22 connects, moisture teller resistance verification switch 4 and measured resistance interface 5, moisture transducer port 6 is connected, outlet 9 is also connected with temperature-humidity signal change-over circuit plate 10, temperature-humidity signal change-over circuit plate 10 and the temperature sensor interface 11 on mainframe box 23, humidity sensor interface 13, temperature and humidity display 15, humiture power switch 16 connects, constant current source adjusting knob 19, constant current source indicator gauge 8 described constant current source 18 be equipped with, described moisture transducer port 6 is equipped with moisture transducer multiplex roles 7, described outlet 9 connects external power supply 17, temperature sensor interface 11 is inserted with temperature sensor 12, humidity sensor interface 13 is inserted with humidity sensor 14, described constant current source 18 is high precise current source.
The present invention is that one can not only be tested direct current resistance, effectively can also examine and determine Corn Moisture Apparatus (resistance-type), the comprehensive calibrator simultaneously can calibrated environmental test equipment humiture again.It is work like this:
(1) direct current resistance test: when testing direct current resistance, as tested certain DC resistance box, according to the requirement of JJG982-2003 " DC resistance box vertification regulation ", power switch 21 in standard DC resistance box 1 of the present invention is opened, connect with the mains, be inserted in resnstance transformer port 22 by residual resisitance compensator and measure residual resisitance, then by JJG982-2003 " DC resistance box vertification regulation " regulation requirement by calculate, eliminate residual voltage.Moisture teller resistance verification switch 4 turns is claimed, in resistance verification, to be realized the verification conversion of measuring resistance, tested resistance by resistance switch 3, tested DC resistance box is connected and tests.When reality test or calibrating resistance, when especially examining and determine the larger resistance of resistance, also should consider the problem of the shielding of connecting line, the input impedance of voltage table, common mode interference and zero current.
(2) calibrating of Corn Moisture Apparatus (resistance-type): during as examined and determine Corn Moisture Apparatus (resistance-type) of 0.5 grade, moisture transducer port 6 on comprehensive calibrator is connected with tested Corn Moisture Apparatus (resistance-type), moisture teller resistance verification switch 4 is utilized to carry out the conversion of Corn Moisture Apparatus (resistance-type) and resistance verification, after switching on power, choose Corn Moisture Apparatus (resistance-type) grain gear successively, by looking into moisture value and the standard DC resistance table of comparisons, find the resistance value that corresponding grain moisture is corresponding, resistance adjustment knob 2 successively in adjustment criteria DC resistance box 1, by revised moisture calibration value with the moisture value examined and determine shown by Corn Moisture Apparatus (resistance-type) examine and determine one by one, examine and determine the error of indication of tested Corn Moisture Apparatus (resistance-type).Its gauging error should meet the regulation requirement of Section 2 the 6th section " error of indication " in JJG891-1995 " capacitance method and electric-resistivity method Corn Moisture Apparatus vertification regulation ", meets the requirements, then this grain gear assay approval of this instrument.If gauging error exceeds specialized range, then tackle after tested Corn Moisture Apparatus (resistance-type) adjusts and re-start calibrating again.
Because measuring resistance is affected by environment larger, the palpus strictly controlled environment condition when using this comprehensive calibrator to examine and determine Corn Moisture Apparatus (resistance-type), the ambient temperature and humidity when control of environmental baseline is examined and determine by the environmental test equipment humiture calibrated section of this comprehensive calibrator controls.When carrying out ambient temperature and humidity control, only arbitrary temperature sensor 12 need be connected on the temperature sensor interface 11 on comprehensive checker rear panel, again arbitrary humidity sensor 14 is connected on humidity sensor interface 13, namely by temperature and humidity display 15 after switching on power, ambient temperature and humidity during actual measurement calibrating, realizes the environmental Kuznets Curves of test condition.
(3) calibration of environmental test equipment humiture: to muffle furnace, drying box, bio-incubator, climatic chamber, when the environmental test equipments such as sterilizing cabinet carry out humiture calibration or detect, by temperature sensor interface 11 and humidity sensor interface 13, external 9 temperature sensors 12 respectively, 3 humidity sensors 14, after connecting humiture power switch 16, by 9 temperature sensors 12, 3 humidity sensors 14, by JJF1101-2003 " environmental test equipment temperature, humidity calibration specification " requirement cloth be placed on muffle furnace, drying box, bio-incubator, climatic chamber, in the environmental test equipments such as sterilizing cabinet, by the temperature of environmental test equipment, humidity controller is set in required nominal temperature, humidity, equipment is normally worked.Start the reading reading temperature and humidity display 15 after stable, every 2min records the humiture of all test points once, tests 15 times altogether in 30min, completes the calibration of environmental test equipment temperature, psychrometry performance.
For ensureing the Stability and veracity of comprehensive calibrator metering performance further, also want regularly to send the legal measurement technology mechanism of qualification to carry out examining and determine or calibrating the components and parts such as standard DC resistance box, high precise current source, voltage table, temperature sensor, humidity sensor as applying unit, to ensure the stable and accurate of this comprehensive calibrator combination property.
Claims (5)
1. a resistance, moisture teller and ambient temperature and humidity comprehensive calibrator, it is characterized in that, it has mainframe box, mainframe box is provided with outlet, outlet connects with constant current source, constant current source connects with standard DC resistance box, standard DC resistance box respectively with the resistance adjustment knob on mainframe box, resistance switch, moisture teller resistance verification switch, voltage table, power switch, resnstance transformer port connects, moisture teller resistance verification switch and measured resistance interface, moisture transducer port is connected, outlet is also connected with temperature-humidity signal change-over circuit plate, temperature sensor interface on temperature-humidity signal change-over circuit plate and mainframe box, humidity sensor interface, temperature and humidity display, humiture power switch connects.
2. a kind of resistance according to claim 1, moisture teller and ambient temperature and humidity comprehensive calibrator, is characterized in that, described constant current source is equipped with constant current source adjusting knob, constant current source indicator gauge.
3. a kind of resistance according to claim 1, moisture teller and ambient temperature and humidity comprehensive calibrator, is characterized in that, described moisture transducer port is equipped with moisture transducer multiplex roles.
4. a kind of resistance according to claim 1, moisture teller and ambient temperature and humidity comprehensive calibrator, is characterized in that, described outlet connects external power supply.
5. a kind of resistance according to claim 1, moisture teller and ambient temperature and humidity comprehensive calibrator, is characterized in that, described constant current source is high precise current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510082660.3A CN104678176A (en) | 2015-02-15 | 2015-02-15 | Comprehensive resistance and moisture tester and environmental temperature and humidity calibration instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510082660.3A CN104678176A (en) | 2015-02-15 | 2015-02-15 | Comprehensive resistance and moisture tester and environmental temperature and humidity calibration instrument |
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| CN104678176A true CN104678176A (en) | 2015-06-03 |
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| CN201510082660.3A Pending CN104678176A (en) | 2015-02-15 | 2015-02-15 | Comprehensive resistance and moisture tester and environmental temperature and humidity calibration instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424767A (en) * | 2015-10-29 | 2016-03-23 | 上海申矽凌微电子科技有限公司 | Humidity-sensor-chip mass production testing device and method |
-
2015
- 2015-02-15 CN CN201510082660.3A patent/CN104678176A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424767A (en) * | 2015-10-29 | 2016-03-23 | 上海申矽凌微电子科技有限公司 | Humidity-sensor-chip mass production testing device and method |
| CN105424767B (en) * | 2015-10-29 | 2018-02-16 | 上海申矽凌微电子科技有限公司 | The test device and method of testing that humidity sensor chip is produced in enormous quantities |
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Application publication date: 20150603 |