CN210199204U - High-resistance verification instrument operational amplifier constant-temperature control cap and high-resistance verification instrument - Google Patents
High-resistance verification instrument operational amplifier constant-temperature control cap and high-resistance verification instrument Download PDFInfo
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- CN210199204U CN210199204U CN201921023328.XU CN201921023328U CN210199204U CN 210199204 U CN210199204 U CN 210199204U CN 201921023328 U CN201921023328 U CN 201921023328U CN 210199204 U CN210199204 U CN 210199204U
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- operational amplifier
- high resistance
- temperature control
- fortune
- shell
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Abstract
The utility model discloses a constant temperature control cap is put to high resistance examination appearance fortune, including the heat insulating mattress, generate heat piece, temperature sensor, shell, exhaust fan, automatic control, the heat insulating mattress generate heat the piece and encircle fortune and put the pin setting, generate heat the piece set up in the heat insulating mattress upper surface, temperature sensor set up in the shell is inboard, exhaust fan install in on the outer wall of shell, automatic control with generate heat piece, temperature sensor, exhaust fan electricity and connect, the utility model also discloses a high resistance examination appearance. The utility model has the advantages that guarantee that fortune is put and is in constant temperature environment, at the high resistance range of high resistance examination appearance, avoid the error that temperature drift brought, when carrying out high resistance examination appearance range maximum X1T omega and measure, measurement accuracy improves to 0.2%, can reduce fortune and put the influence of imbalance voltage and imbalance current to measuring result, improves the shielding property that fortune was put, improves measuring signal's stability.
Description
Technical Field
The utility model relates to a high resistance examination appearance especially relates to a constant temperature control cap is put in high resistance examination appearance fortune.
Background
The following three methods are proposed for the source tracing verification principle of the high-voltage high-value resistor in the DC high-voltage high-value resistor: the voltage division method, voltage division method and bridge method of operational amplifier are adopted. At present, most of high-resistance calibrating instruments adopt an operational amplifier voltage division method to carry out high-resistance measurement, and the high-resistance measurement has very strict requirements on operational amplifiers, and needs very high input impedance, extremely low bias current and small temperature drift.
The formula 1 is a calculation formula for measuring voltage by adopting a voltage division method of an operational amplifier, the first term on the right side of an equal sign is the voltage output of an ideal operational amplifier, and the last two terms are introduced output error terms. In the actual use process, the voltage auto-zero and current compensation technology can be adopted to eliminate IosAnd VosInfluence of the initial value, but due to IosAnd VosThe influence of time drift and temperature drift exists, and the actual output is mainly expressed as delta IosAnd Δ VosWith the influence of temperature variation, the influence cannot be offset by general compensation, and thus an error of an output voltage is brought. The maximum measuring range of the existing high-resistance detector is multiplied by 1T omega, and the operational amplifier adopts an electrometer high-input impedance operational amplifier, I of whichOS＝30fA/℃,VOS10uV/° C, R in formula 1NTo be the measured resistance value, RFThe resistance value of the feedback resistor of the system is 200M omega, so that the error of the output voltage caused by 1-degree-centigrade temperature change is equal to 16 uV/DEG C. When the measured resistance value is 10T omega and the working voltage is 1000V, the signal voltage is as follows: the error caused by temperature drift per degree centigrade is as follows: the measuring accuracy of the measuring range is controlled to be at most 1% level by combining the existence of influence quantities such as 16uV/20mV (0.08%), operational amplifier bias current, noise, time constant of high-value resistance and the like. For the great disadvantage brought by the improvement of the measurement precision of the tiny current under the high resistance value, in the high resistance range of the high resistance detector, the error brought by the temperature drift is particularly large due to the existence of the offset voltage and the offset current of the operational amplifier, so the improvement of the device for reducing the error is urgently needed。
SUMMERY OF THE UTILITY MODEL
Utility model purpose: to the problem, the utility model aims at providing a constant temperature control cap and high resistance examination appearance are put to high resistance examination appearance fortune is guaranteed to transport and is put ambient temperature stable, reduces the error that adopts the partial pressure method measuring voltage that fortune was put.
The technical scheme is as follows:
the utility model discloses a constant temperature control cap is put to high resistant examination appearance fortune, including the heat insulating mattress, generate heat piece, temperature sensor, shell, exhaust fan, automatic control, the heat insulating mattress generate heat the piece and encircle fortune and put the pin setting, generate heat the piece set up in the heat insulating mattress upper surface, temperature sensor set up in the shell is inboard, exhaust fan install in on the outer wall of shell, automatic control with generate heat piece, temperature sensor, exhaust fan electricity and connect, through automatic control automatic regulation and control generate heat piece and exhaust fan, guarantee that fortune is put and is in constant temperature environment.
Preferably, in order to further improve the temperature control accuracy, the temperature sensor is arranged on the operational amplifier surface.
Preferably, in order to avoid the influence of the heating sheet on the operational amplifier pins, the operational amplifier constant-temperature control cap of the high-resistance calibrating instrument further comprises a polytetrafluoroethylene protective sleeve, wherein the polytetrafluoroethylene protective sleeve is arranged at intervals between the operational amplifier pins and the heat insulation pad between the heating sheets.
Preferably, the shell set up in the heat insulating mattress generate heat the piece outside, and with the heat insulating mattress generate heat piece sealing connection, improve the shielding performance that fortune was put, improve measuring signal's stability.
Preferably, in order to realize the heat preservation function, the constant temperature control cap is put to high resistance examination appearance fortune still includes thermal-insulated heat preservation spare, thermal-insulated heat preservation spare set up in the shell inboard.
Specifically, the shell is made of metal.
Preferably, in order to enhance the heat exchange effect, the exhaust fan is mounted on the top of the housing.
Specifically, the heating sheet is a PTC heating sheet.
The utility model also discloses a high resistance examination appearance, put constant temperature control cap, fortune including above-mentioned high resistance examination appearance fortune and put pin, fortune and put, the constant temperature control cap is put to high resistance examination appearance fortune install in the pin reaches is put to fortune the outside is put to fortune.
Has the advantages that: compared with the prior art, the utility model has the advantages that adopt the piece that generates heat, temperature controller, exhaust fan, automatic control, the temperature in the automatically regulated shell, guarantee that fortune is put and is in the constant temperature environment, high resistance range at high resistance examination appearance, avoid the error that temperature drift brought, when carrying out high resistance examination appearance range maximum X1T omega measurement, measurement accuracy improves to 0.2%, can show to reduce fortune and put the influence of imbalance voltage and imbalance current to measuring result, further improve the shielding performance that fortune was put, improve measuring signal's stability, the effect of dehumidification is also played in stable temperature field, be favorable to reducing bad coupling such as distributed capacitance to measuring negative effects.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
fig. 3 is a schematic diagram of the module control of the present invention.
Detailed Description
The present invention will be further explained with reference to specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, and modifications to the various equivalent forms of the invention, which may occur to those skilled in the art upon reading the present invention, fall within the scope of the appended claims.
As shown in fig. 1-2, a high resistance calibration instrument operational constant temperature control cap comprises a heat insulation pad 1, a heating sheet 2, a temperature sensor 3, a shell 4, an exhaust fan 5, an automatic controller, a polytetrafluoroethylene protective sleeve 8 and a heat insulation and preservation member 9. The heat insulation pad 1 and the heating sheet 2 are arranged around the operational amplifier pin 6, and the polytetrafluoroethylene protective sleeve 8 is arranged between the operational amplifier pin 6 and the heat insulation pad 1 and the heating sheet 2 at intervals. Heating plate 2 sets up in heat insulating mattress 1 upper surface, and heating plate 2 adopts PTC heating plate, and fortune is put 7 and is set up in fortune and put pin 6 top, and temperature sensor 3 sets up in fortune and puts 7 surfaces. The shell 4 is made of metal, the heat insulation part 9 is arranged on the inner side of the shell 4, and the shell 4 is arranged on the outer sides of the heat insulation pad 1 and the heating sheet 2 and is connected with the heat insulation pad and the heating sheet in a sealing mode. The top of the shell 4 is provided with a mounting hole, and the exhaust fan 5 is mounted on the top of the shell 4. The automatic controller is electrically connected with the heating sheet 2, the temperature sensor 3 and the exhaust fan 5.
The utility model also discloses a high resistance examination appearance, put constant temperature control cap, fortune including above-mentioned high resistance examination appearance fortune and put pin 6, fortune and put 7, the constant temperature control cap is put in fortune to high resistance examination appearance fortune is installed and is put pin 6 and fortune and put 7 outsides.
The utility model discloses an application method puts constant temperature control cap for putting this high resistance examination appearance fortune and installs around fortune is put to do sealing treatment, after the high resistance examination appearance circular telegram, through the piece rapid heating that generates heat heaies up, as shown in FIG. 3, detect the temperature when temperature sensor and reach and set for steady temperature, give automatic control with signal transmission, automatic control generates heat the piece stop heating, and variable frequency control exhaust fan wind speed, makes the temperature keep invariable, and the accuse temperature process adopts the PID algorithm to carry out the operation processing.
The utility model has the advantages of automatically regulated temperature, guarantee that fortune is put and is in constant temperature environment, high resistance range at high resistance examination appearance, the error of avoiding temperature drift to bring, carry out high resistance examination appearance range maximum when X1T omega is measured, measurement accuracy improves to 0.2%, can show to reduce fortune and put the influence of imbalance voltage and imbalance current to measuring result, further improve the shielding property that fortune was put, improve measuring signal's stability, the effect of dehumidification is also played in stable temperature field, be favorable to reducing bad coupling such as distributed capacitance to measuring negative effects.
Claims (9)
1. The utility model provides a constant temperature control cap is put in high resistant examination appearance fortune which characterized in that: including heat insulating mattress (1), generate heat piece (2), temperature sensor (3), shell (4), exhaust fan (5), automatic control, heat insulating mattress (1) generate heat piece (2) and encircle fortune and put pin (6) setting, generate heat piece (2) set up in heat insulating mattress (1) upper surface, temperature sensor (3) set up in shell (4) are inboard, exhaust fan (5) install in on the outer wall of shell (4), automatic control with generate heat piece (2), temperature sensor (3), exhaust fan (5) electricity and connect.
2. The high resistance assay instrument operational amplifier constant temperature control cap of claim 1, wherein: the temperature sensor (3) is arranged on the upper surface of the operational amplifier (7).
3. The high resistance assay instrument operational amplifier constant temperature control cap of claim 1, wherein: still include polytetrafluoroethylene protective sheath (8), polytetrafluoroethylene protective sheath (8) interval set up in fortune put pin (6) with heat insulating mattress (1) between piece (2) generate heat.
4. The high resistance assay instrument operational amplifier constant temperature control cap of claim 1, wherein: the shell (4) is arranged on the outer sides of the heat insulation pad (1) and the heating sheet (2) and is in sealing connection with the heat insulation pad (1) and the heating sheet (2).
5. The high resistance assay instrument operational amplifier constant temperature control cap of claim 1, wherein: still include thermal-insulated heat preservation (9), thermal-insulated heat preservation (9) set up in shell (4) inboard.
6. The high resistance assay instrument operational amplifier constant temperature control cap of claim 1, wherein: the shell (4) is made of metal.
7. The high resistance assay instrument operational amplifier constant temperature control cap of claim 1, wherein: the exhaust fan (5) is arranged at the top of the shell (4).
8. The high resistance assay instrument operational amplifier constant temperature control cap of claim 1, wherein: the heating sheet (2) adopts a PTC heating sheet.
9. A high resistance examination appearance which characterized in that: the high-resistance calibration instrument operational amplifier constant-temperature control cap comprises the high-resistance calibration instrument operational amplifier constant-temperature control cap, an operational amplifier pin (6) and an operational amplifier (7) according to any one of claims 1 to 8, wherein the high-resistance calibration instrument operational amplifier constant-temperature control cap is installed on the outer sides of the operational amplifier pin (6) and the operational amplifier (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921023328.XU CN210199204U (en) | 2019-07-02 | 2019-07-02 | High-resistance verification instrument operational amplifier constant-temperature control cap and high-resistance verification instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921023328.XU CN210199204U (en) | 2019-07-02 | 2019-07-02 | High-resistance verification instrument operational amplifier constant-temperature control cap and high-resistance verification instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210199204U true CN210199204U (en) | 2020-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921023328.XU Active CN210199204U (en) | 2019-07-02 | 2019-07-02 | High-resistance verification instrument operational amplifier constant-temperature control cap and high-resistance verification instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210199204U (en) |
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2019
- 2019-07-02 CN CN201921023328.XU patent/CN210199204U/en active Active
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