CN204302480U - A kind of monolithic processor controlled teslameter - Google Patents
A kind of monolithic processor controlled teslameter Download PDFInfo
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- CN204302480U CN204302480U CN201520004099.2U CN201520004099U CN204302480U CN 204302480 U CN204302480 U CN 204302480U CN 201520004099 U CN201520004099 U CN 201520004099U CN 204302480 U CN204302480 U CN 204302480U
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- photoisolator
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- teslameter
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Abstract
The monolithic processor controlled teslameter of one of the present utility model relates to field of intelligent control technology, by CPU, storer, keyboard & display, host computer and photoisolator are formed, photoisolator, storer and keyboard & display all connect with CPU, host computer is connected with CPU by serial communication interface, magnetic field to be measured, hall probe, Signal Pretreatment, signal amplifies, digital zero setting, sampling and peak value measurement, A/D converter and photoisolator successively circuit are connected, photoisolator and D/A converter, voltage controlled current source and hall probe successively circuit are connected, D/A converter, digital zero setting is connected successively with A/D converter.The monolithic processor controlled teslameter of one of the present utility model, there is comparatively high measurement accuracy and comparatively wide-measuring range, thus the automatic Calibration realized probe and zeroing, the error eliminating loaded down with trivial details calibration work and produce, the high-efficiency high-precision achieving teslameter is measured, measure accurately, error is little, to the auto-scaling of popping one's head in and zeroing.
Description
Technical field
The utility model relates to field of intelligent control technology, particularly relates to a kind of monolithic processor controlled teslameter.
Background technology
Along with the develop rapidly of economy, Hall element is applied to industry-by-industry.Due to utilize Hall element measure magnetic field highly sensitive, accommodation is wide, both can measure stationary magnetic field, can measure alternating magnetic field again, so its use is more and more extensive.But in use Hall element measuring process, it easily causes damage due to human factor, so just needs to reinstall new probe.But the sensitivity of different probe is different with volt age offset, therefore, needs again to demarcate, and calibration process more complicated, need the professional targeting device of degree of precision, general user does not possess such condition.Like product domestic at present completes calibration before user uses, and again calibrates if tip damage just can only return factory.
Utility model content
The utility model is intended to overcome the deficiencies in the prior art, provide a kind of monolithic processor controlled teslameter, this device passes through the information of popping one's head under standard state, the information of collection is put in memory, when needs are calibrated new probe, contrast with the standard information collected, thus the calibration realized probe and zeroing; Achieve and automatically carry out calibrating and returning to zero after replacing probe, and there is comparatively high measurement accuracy and comparatively wide-measuring range.
The monolithic processor controlled teslameter of one of the present utility model, by CPU, storer, keyboard-display circuit, photoisolator, serial communication interface, host computer, magnetic field to be measured, hall probe and sampling are formed with peak value measurement circuit, described photoisolator, storer and keyboard-display circuit all connect with CPU, host computer is connected with CPU by serial communication interface, magnetic field to be measured, hall probe, signal pre-processing circuit, signal amplification circuit, digital zero setting circuit, sampling and peak value measurement circuit, A/D converter and photoisolator successively circuit are connected, photoisolator and D/A converter, voltage controlled current source and hall probe successively circuit are connected, D/A converter, digital zero setting circuit is connected successively with A/D converter.
As further improvement of the utility model, photoisolator and signal amplification circuit connection, digital zero setting circuit, frequency measurement circuit and photoisolator connection successively.
The monolithic processor controlled teslameter of one of the present utility model, by demarcating hall probe the probe control of working current and standard teslameter, single-chip microcomputer is utilized to carry out reading and the control of correlation parameter to hall probe, and there is comparatively high measurement accuracy and comparatively wide-measuring range, thus the automatic Calibration realized probe and zeroing, the error eliminating loaded down with trivial details calibration work and produce, the high-efficiency high-precision achieving teslameter is measured, measure accurately, error is little, to auto-scaling and the zeroing of probe, remove from loaded down with trivial details calibration work and calibration be produce error, the high-efficiency high-precision achieving teslameter is measured.
Accompanying drawing explanation
Fig. 1 is the utility model structured flowchart;
Fig. 2 is the utility model MAX541 interface circuit figure;
Fig. 3 is the utility model OP07 programmable amplifying circuit figure;
Fig. 4 is the utility model digital zero setting circuit diagram;
Fig. 5 is the utility model peakvalue's checking holding circuit figure;
Fig. 6 is the utility model MAX110 fundamental diagram.
Embodiment
Below in conjunction with accompanying drawing 1 to accompanying drawing 6 to the monolithic processor controlled teslameter of one of the present utility model, be described further.
The monolithic processor controlled teslameter of one of the present utility model, by CPU, storer, keyboard-display circuit, photoisolator, serial communication interface, host computer, magnetic field to be measured, hall probe and sampling are formed with peak value measurement circuit, described photoisolator, storer and keyboard-display circuit all connect with CPU, host computer is connected with CPU by serial communication interface, magnetic field to be measured, hall probe, signal pre-processing circuit, signal amplification circuit, digital zero setting circuit, sampling and peak value measurement circuit, A/D converter and photoisolator successively circuit are connected, photoisolator and D/A converter, voltage controlled current source and hall probe successively circuit are connected, D/A converter, digital zero setting circuit is connected successively with A/D converter.Photoisolator and signal amplification circuit connection, digital zero setting circuit, frequency measurement circuit and photoisolator connection successively.
In the technical program, take single-chip computer AT89C52 as core in fact, also comprise an ambipolar A/D converter MAX110 of binary channels, serial sixteen bit D/A converter MAX541, scaling parameter table memory X24128, with the display circuit of 1602LCD composition and the RS232 serial communication interface with microcomputer communication, signal amplification circuit is OP07 programmable amplifying circuit, and photoisolator is TLP521.
Its magnetic-field measurement of the monolithic processor controlled teslameter of one of the present utility model is primarily of hall probe, voltage controlled current source, signal amplification circuit, A/D converter composition.All low frequency interface control lines relevant with mimic channel all adopt photoelectrical coupler TLP521 to isolate.Serial communication interface circuit selects the MAX232 of low-power consumption to complete the conversion of TTL-RS232 level, realizes the communication between system and host computer.Scaling parameter is stored in serial storage X24128, thus realizes auto-scaling operation.Display circuit adopts chip 1602 to realize, and shows the real-time measuring data of main frame with LCD, and button adopts interrupt mode response.Teslameter for measurement permanent magnetism product Surface field intensity, mainly to the quality of permanent magnet product and after magnetizing the assessment of consistency of performance be of great significance.
With AT89C52 single-chip microcomputer, the calibration of teslameter and zeroing are controlled; The control signal that CPU exports is changed through D/A, controls voltage controlled current source.When magnetic field intensity is less than 1.0T, hall probe exports the actual field strongly consistent recorded with coil, in good linear.At this moment, by changing the working current I of probe, the magnetic induction density B that Hall voltage VH and measuring coil are obtained becomes certain proportionate relationship, completes the demarcation of linear zone.When magnetic field intensity is in 1.2T, hall probe exports in non-linear, and the result of A/D conversion must carry out revising the exact value that just can obtain tested magnetic field.As long as at this moment single-chip microcomputer reads the value corresponding to the E2PROM packaged by teslameter interface, the value in magnetic field can be obtained through interpolation arithmetic.
MAX541 interface circuit, as shown in Figure 2, be the D/A conversion chip that MAXIM company of the U.S. produces, it is low-power consumption (1.5mW), exports, with the serial 16 figure place weighted-voltage D/A converter of list+5V power work without buffer voltagc.Its switching time is 1 μ s, and output voltage transformation range is 0V ~ V
rEF.The output area of analog output voltage VOUT carrys out the control of rule by inputting different digital codes, when 16 digit numerical code inputted are 0 entirely, output voltage is 0.When 16 digit numerical code inputted are 1 entirely, output voltage is VREF and 2.5V.The Changing Pattern of output voltage is, 16 digit numerical code, from 0, add 1 at every turn, until be 1 entirely, corresponding output voltage is always each from 0 to be increased.
OP07 programmable amplifying circuit, as shown in Figure 3, the programmable amplifying circuit be made up of one group of switch and resistor network and an integrated operational amplifier, is connected by Single-chip Controlling controllable simulation switch selectivity and just can obtain different enlargement factors, meet measurement demand.Because the signal gathered is more weak, because measured signal is very little, need to select the accurate amplification that the amplifier of function admirable just likely realizes this weak signal.Therefore the amplifier OP07 of high precision, low drifting, high stability should be selected on device is selected.A, B pin and single-chip microcomputer P1.6, P1.7 of analog switch control, and by the size of checking measurements numerical value, select suitable amplification coefficient, reach program control object.
Digital zero setting circuit, as shown in Figure 4, the range different to various probe returns to zero, and the bucking voltage numerical value of correspondence is existed E
2in PROM; Range swithching or after manually selecting range in measuring process, can directly inquire about corresponding numerical value, export bucking voltage to digital zero setting circuit, return to zero by D/A converter.Owing to have employed high-precision A/D and D/A converter, the volt age offset after zeroing is less than 0.1mV.More accurate measurement can be ensured.
Sampling and peak value measurement circuit and holding circuit, as shown in Figure 5, LF398 is the chip that sampling keeps special.LF398 is the integrated sampling holder of National Semiconductor's development.It only needs an external holding capacitor just can complete sampling maintenance function, and its sampling retentive control end can directly be connected to TTL, CMOS logic level, and input offset regulates and performed by single pin.Power source voltage Vcc is (+5 ~+18) V; V
eEfor (-5 ~-18) V, rated disspation is 500mW, and working temperature is 0 ~ 70 DEG C, input voltage≤supply voltage, and holding capacitor short circuit duration is 10 seconds.AP1.2, AP2.0, AP2.1, AP1.3, AP2.2, AP2.3 are connected with P1.2, P2.0, P2.1, P1.3, P2.2, P2.3 of single-chip microcomputer, the control signal after homophase Phototube Coupling, are used for controlling detection and the maintenance of positive and negative peak value respectively.
A/D change-over circuit, as shown in Figure 6.Because MAX110 precision is high, speed is fast and be widely used in medical signals collecting, portable apparatus, pressure, temperature measurement system.MAX110 analog to digital converter adopts inner Automatic Calibration Technique, just need not can reach ± the resolution of 14, and can point out outrange position by external circuit.Working power electric current is 550 μ A only, can be applied to the occasion of high resolution detection ideally, employing ± 5V Power supply, can convert to the differential analog signal in+3V scope by p-3V.
Claims (2)
1. a monolithic processor controlled teslameter, by CPU, storer, keyboard-display circuit, photoisolator, serial communication interface, host computer, magnetic field to be measured, hall probe and sampling are formed with peak value measurement circuit, it is characterized in that photoisolator, storer and keyboard-display circuit all connect with CPU, host computer is connected with CPU by serial communication interface, magnetic field to be measured, hall probe, signal pre-processing circuit, signal amplification circuit, digital zero setting circuit, sampling and peak value measurement circuit, A/D converter and photoisolator successively circuit are connected, photoisolator and D/A converter, voltage controlled current source and hall probe successively circuit are connected, D/A converter, digital zero setting circuit is connected successively with A/D converter.
2. a kind of monolithic processor controlled teslameter as claimed in claim 1, is characterized in that photoisolator and signal amplification circuit connection, digital zero setting circuit, frequency measurement circuit and photoisolator connection successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520004099.2U CN204302480U (en) | 2015-01-06 | 2015-01-06 | A kind of monolithic processor controlled teslameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520004099.2U CN204302480U (en) | 2015-01-06 | 2015-01-06 | A kind of monolithic processor controlled teslameter |
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| CN204302480U true CN204302480U (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520004099.2U Expired - Fee Related CN204302480U (en) | 2015-01-06 | 2015-01-06 | A kind of monolithic processor controlled teslameter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785289A (en) * | 2016-05-22 | 2016-07-20 | 南宁市茂百科技有限公司 | Portable magnetic-field detector |
| CN106054088A (en) * | 2016-07-14 | 2016-10-26 | 江西飞尚科技有限公司 | Self-zero amplification circuit for improving dynamic output scope of magnetic flux sensor |
| CN106707205A (en) * | 2017-02-06 | 2017-05-24 | 南京艾驰电子科技有限公司 | Integrated gauss meter system and integrated gauss meter |
| CN109188319A (en) * | 2018-10-18 | 2019-01-11 | 国网山东省电力公司潍坊供电公司 | A kind of hand-held alternating current-direct current detection of magnetic field instrument |
| CN111624413A (en) * | 2020-04-22 | 2020-09-04 | 山东省产品质量检验研究院 | Power frequency magnetic field intensity testing arrangement with infrared communication function |
-
2015
- 2015-01-06 CN CN201520004099.2U patent/CN204302480U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785289A (en) * | 2016-05-22 | 2016-07-20 | 南宁市茂百科技有限公司 | Portable magnetic-field detector |
| CN106054088A (en) * | 2016-07-14 | 2016-10-26 | 江西飞尚科技有限公司 | Self-zero amplification circuit for improving dynamic output scope of magnetic flux sensor |
| CN106054088B (en) * | 2016-07-14 | 2018-11-30 | 江西飞尚科技有限公司 | It is a kind of improve magnetic flux transducer dynamic output range from zero amplifying circuit |
| CN106707205A (en) * | 2017-02-06 | 2017-05-24 | 南京艾驰电子科技有限公司 | Integrated gauss meter system and integrated gauss meter |
| CN109188319A (en) * | 2018-10-18 | 2019-01-11 | 国网山东省电力公司潍坊供电公司 | A kind of hand-held alternating current-direct current detection of magnetic field instrument |
| CN111624413A (en) * | 2020-04-22 | 2020-09-04 | 山东省产品质量检验研究院 | Power frequency magnetic field intensity testing arrangement with infrared communication function |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150429 Termination date: 20160106 |