CN105628239A - Wide-range and high-precision temperature measurement device adopting platinum resistor and measurement method - Google Patents
Wide-range and high-precision temperature measurement device adopting platinum resistor and measurement method Download PDFInfo
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- CN105628239A CN105628239A CN201410576716.6A CN201410576716A CN105628239A CN 105628239 A CN105628239 A CN 105628239A CN 201410576716 A CN201410576716 A CN 201410576716A CN 105628239 A CN105628239 A CN 105628239A
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Abstract
A wide-range and high-precision temperature measurement device adopting a platinum resistor and a measurement method are provided. The currently used temperature measurement system cannot facilitate high-precision temperature measurement in the process of industrial production and scientific research. The device comprises a device shell (16) which is internally equipped with a micro-programmed control unit (1). The micro-programmed control unit is connected with a relay driver (2), a display screen (3), an external keyboard (4) and a low-noise temperature measurement analog-to-digital converter (5). The relay driver is connected with a feedback resistor group (6), the feedback resistor group is connected with a temperature sensor (7), the temperature sensor is connected with a power supply (8) and a platinum resistor (9), and the platinum resistor is connected with a standard resistor (10). The low-noise temperature measurement analog-to-digital converter is connected with a group of precision instrument amplifiers (11), the group of precision instrument amplifiers is connected with a group of wires (12), and the wires are respectively connected with a feedback resistor group wire, a platinum resistor wire and a standard resistor wire. The device and the method of the invention are used for precise temperature measurement.
Description
Technical field:
The present invention relates to a kind of wide-range high-precision temperature measuring equipment adopting platinum resistance.
Background technology:
Designed at present and application temperature measurement system volume is big, precision is not high, it is not possible to for the high-resolution hydrocode in commercial production and scientific research process, it is also difficult to as transferable measurement criteria.
Summary of the invention:
It is an object of the invention to provide a kind of wide-range high-precision temperature measuring equipment adopting platinum resistance.
Above-mentioned purpose is realized by following technical scheme:
A kind of wide-range high-precision temperature measuring equipment adopting platinum resistance, its composition includes: device case, in described housing, microprogram control unit is installed, described microprogram control unit and relay driver, display screen, external connection keyboard, low noise temperature survey analog-digital converter connects, described relay driver is connected with feedback resistance group, described feedback resistance group is connected with temperature sensor, described temperature sensor and power supply, platinum resistance connects, described platinum resistance and measuring resistance connect, described low noise temperature survey analog-digital converter and one group of precision instrumentation amplifier connect, one group of described precision instrumentation amplifier is connected to one group of wire, described wire and described feedback resistance group wire, described platinum resistance wire, described measuring resistance wire connects.
The wide-range high-precision temperature measuring equipment of described employing platinum resistance, described resistor group includes resistance A, resistance B, resistance C, what three resistance arranged different resistance can export 0.5mA, 0.7mA, the resistance of tri-kinds of constant currents of 1mA, described measuring resistance is precision is ten thousand/ wire-wound resistor, described wire group totally four wires, wire one end, one, top is connected with described accurate instrumentation amplifier group, the other end is connected with described resistor group and described temperature sensor, wire one end, two, middle part connects described accurate instrumentation amplifier group, it is be connected on the wire between described platinum resistance and described measuring resistance after one that the other end converges, wire one end, one, bottom is connected with described accurate instrumentation amplifier group, the other end is connected with described measuring resistance side wire.
Beneficial effect:
1. the temperature measurement system designed by the present invention has the features such as volume is little, precision is high, stable performance, reproducible, error is little, can be used not only for the high-resolution hydrocode in commercial production and scientific research process, it is possible to as transferable measurement criteria.
Accompanying drawing illustrates:
Accompanying drawing 1 is the structural representation of the present invention.
Accompanying drawing 2 is the microprogram control unit circuit diagram of the present invention.
Accompanying drawing 3 is the display screen connection circuit of the present invention.
Detailed description of the invention:
Embodiment 1:
A kind of wide-range high-precision temperature measuring equipment adopting platinum resistance, its composition includes: device case 16, microprogram control unit 1 is installed in described housing, described microprogram control unit and relay driver 2, display screen 3, external connection keyboard 4, low noise temperature survey analog-digital converter 5 connects, described relay driver is connected with feedback resistance group 6, described feedback resistance group is connected with temperature sensor 7, described temperature sensor and power supply 8, platinum resistance 9 connects, described platinum resistance and measuring resistance 10 connect, described low noise temperature survey analog-digital converter and one group of precision instrumentation amplifier 11 connect, one group of described precision instrumentation amplifier is connected to one group of wire 12, described wire and described feedback resistance group wire, described platinum resistance wire, described measuring resistance wire connects.
Embodiment 2:
The wide-range high-precision temperature measuring equipment of the employing platinum resistance according to embodiment 1, described resistor group includes resistance A12, resistance B14, resistance C15, what three resistance arranged different resistance can export 0.5mA, 0.7mA, the resistance of tri-kinds of constant currents of 1mA, described measuring resistance is precision is ten thousand/ wire-wound resistor, described wire group totally four wires, wire one end, one, top is connected with described accurate instrumentation amplifier group, the other end is connected with described resistor group and described temperature sensor, wire one end, two, middle part connects described accurate instrumentation amplifier group, it is be connected on the wire between described platinum resistance and described measuring resistance after one that the other end converges, wire one end, one, bottom is connected with described accurate instrumentation amplifier group, the other end is connected with described measuring resistance side wire.
Embodiment 3:
The measuring method of the wide-range high-precision temperature measuring equipment of the employing platinum resistance according to embodiment 1 or 2, the core devices that the present invention adopts platinum resistance to be constant-current source, the feedback resistance being respectively provided with three different resistances can export 0.5mA, 0.7mA, tri-kinds of constant currents of 1mA, the switching of resistance is completed by signal relay, and signal relay is controlled by relay driver by microprogram control unit.-30-80 DEG C of scope adopts the test electric current of 1mA, 80-190 DEG C of scope adopts 0.7mA to test electric current, 190-300 DEG C of scope adopts the test electric current of 0.5mA, measuring resistance is precision is ten thousand/ wire-wound resistor, adopt accurate instrumentation amplifier as the core devices of platinum resistance and the signal amplification circuit of measuring resistance, the voltage drop of platinum resistance is amplified 100 times, the voltage drop of measuring resistance is amplified 40 times, the microprogram control unit input information according to keyboard, initiate a temperature survey, microprogram control unit is control signal relay first, make the electric current of temperature sensor output 1mA, then, gather the output signal voltage of platinum resistance, if reaching 5V, then drive the feedback resistance of relay switching temperature sensor, until platinum resistance output voltage is lower than 5V, and then gather platinum resistance and the voltage signal of measuring resistance output simultaneously, and carry out be divided by operation and temperature conversion, display is sent by scaling results.
Claims (3)
1. the wide-range high-precision temperature measuring equipment adopting platinum resistance, its composition includes: device case, it is characterized in that: in described housing, microprogram control unit is installed, described microprogram control unit and relay driver, display screen, external connection keyboard, low noise temperature survey analog-digital converter connects, described relay driver is connected with feedback resistance group, described feedback resistance group is connected with temperature sensor, described temperature sensor and power supply, platinum resistance connects, described platinum resistance and measuring resistance connect, described low noise temperature survey analog-digital converter and one group of precision instrumentation amplifier connect, one group of described precision instrumentation amplifier is connected to one group of wire, described wire and described feedback resistance group wire, described platinum resistance wire, described measuring resistance wire connects.
2. the wide-range high-precision temperature measuring equipment of employing platinum resistance according to claim 1, it is characterized in that: described resistor group includes resistance A, resistance B, resistance C, what three resistance arranged different resistance can export 0.5mA, 0.7mA, the resistance of tri-kinds of constant currents of 1mA, described measuring resistance is precision is ten thousand/ wire-wound resistor, described wire group totally four wires, wire one end, one, top is connected with described accurate instrumentation amplifier group, the other end is connected with described resistor group and described temperature sensor, wire one end, two, middle part connects described accurate instrumentation amplifier group, it is be connected on the wire between described platinum resistance and described measuring resistance after one that the other end converges, wire one end, one, bottom is connected with described accurate instrumentation amplifier group, the other end is connected with described measuring resistance side wire.
3. the method for the wide-range high-precision temperature measuring equipment measurement of the employing platinum resistance that a kind utilizes described in claim 1 or 2, it is characterized in that: adopting platinum resistance is the core devices of constant-current source, the feedback resistance being respectively provided with three different resistances can export 0.5mA, 0.7mA, tri-kinds of constant currents of 1mA, the switching of resistance is completed by signal relay, and signal relay is controlled by relay driver by microprogram control unit,-30-80 DEG C of scope adopts the test electric current of 1mA, 80-190 DEG C of scope adopts 0.7mA to test electric current, 190-300 DEG C of scope adopts the test electric current of 0.5mA, measuring resistance is precision is ten thousand/ wire-wound resistor, adopt accurate instrumentation amplifier as the core devices of platinum resistance and the signal amplification circuit of measuring resistance, the voltage drop of platinum resistance is amplified 100 times, the voltage drop of measuring resistance is amplified 40 times, the microprogram control unit input information according to keyboard, initiate a temperature survey, microprogram control unit is control signal relay first, make the electric current of temperature sensor output 1mA, then, gather the output signal voltage of platinum resistance, if reaching 5V, then drive the feedback resistance of relay switching temperature sensor, until platinum resistance output voltage is lower than 5V, and then gather platinum resistance and the voltage signal of measuring resistance output simultaneously, and carry out be divided by operation and temperature conversion, display is sent by scaling results.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410576716.6A CN105628239A (en) | 2014-10-25 | 2014-10-25 | Wide-range and high-precision temperature measurement device adopting platinum resistor and measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410576716.6A CN105628239A (en) | 2014-10-25 | 2014-10-25 | Wide-range and high-precision temperature measurement device adopting platinum resistor and measurement method |
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| Publication Number | Publication Date |
|---|---|
| CN105628239A true CN105628239A (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410576716.6A Withdrawn CN105628239A (en) | 2014-10-25 | 2014-10-25 | Wide-range and high-precision temperature measurement device adopting platinum resistor and measurement method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975616A (en) * | 2018-12-29 | 2019-07-05 | 浙江机电职业技术学院 | A kind of wide-range high-precision resistance meter |
| CN111751599A (en) * | 2020-07-08 | 2020-10-09 | 广东电网有限责任公司 | Movable capacitive voltage transformer device and online monitoring system |
-
2014
- 2014-10-25 CN CN201410576716.6A patent/CN105628239A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975616A (en) * | 2018-12-29 | 2019-07-05 | 浙江机电职业技术学院 | A kind of wide-range high-precision resistance meter |
| CN109975616B (en) * | 2018-12-29 | 2021-08-17 | 浙江机电职业技术学院 | A wide-range high-precision resistance tester |
| CN111751599A (en) * | 2020-07-08 | 2020-10-09 | 广东电网有限责任公司 | Movable capacitive voltage transformer device and online monitoring system |
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Application publication date: 20160601 |