CN212459857U - Hand-held inductive load direct current resistance automatic measuring device - Google Patents
Hand-held inductive load direct current resistance automatic measuring device Download PDFInfo
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- CN212459857U CN212459857U CN202021177918.0U CN202021177918U CN212459857U CN 212459857 U CN212459857 U CN 212459857U CN 202021177918 U CN202021177918 U CN 202021177918U CN 212459857 U CN212459857 U CN 212459857U
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- 230000001939 inductive effect Effects 0.000 title claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 50
- 230000003993 interaction Effects 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 18
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 16
- 238000013500 data storage Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 230000006870 function Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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Abstract
The utility model relates to a high-voltage electrical measuring instrument, especially a hand-held type inductive load direct current resistance automatic measuring device. The device comprises a handheld instrument shell module, a direct current resistance automatic measurement module and a man-machine interaction module; the hand-held instrument shell module provides an integral internal frame and an external shell for the tester; the direct current resistance measuring module is used for automatically measuring the direct current resistance of the inductive load; the human-computer interaction module is used for inputting parameter setting information and outputting a test result; the hand-held instrument shell module comprises an upper cover, a lower cover, a side plate, a bracket, a rubber sleeve and a handle belt; the side plate is positioned between the upper cover and the lower cover; the direct current resistance measuring module comprises a relay switching unit, a constant current source circuit, a signal acquisition circuit, an A/D (analog/digital) converter and a central processing unit; the man-machine interaction module comprises a liquid crystal display unit, a keyboard operation unit, a data printing unit and a data storage unit.
Description
Technical Field
The utility model relates to a high-voltage electrical measuring instrument, especially a hand-held type inductive load direct current resistance automatic measuring device.
Background
The testing of the direct current resistance of the transformer is a necessary item for the maintenance of the transformer in case of power failure, and has very important significance in each maintenance of the transformer, and the coil of the transformer is an inductive load with very large inductance, and special testing equipment must be used for testing the direct current resistance. Usually, when testing, the user does not know the resistance range of the test article, and traditional test instrument all divide into a plurality of electric current test gear, and this just needs a lot of to select a suitable electric current gear to test at last many times the test of shelves, and every test all needs the charge-discharge process, does many repetitive work, wastes a large amount of time, and is inefficient.
SUMMERY OF THE UTILITY MODEL
The utility model aims at above-mentioned weak point provides a hand-held type perception load direct current resistance automatic measuring device, and the device possesses automatic current test function, can test according to the suitable electric current gear of sample size automatic selection.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a hand-held inductive load direct current resistance automatic measuring device comprises a hand-held instrument shell module, a direct current resistance automatic measuring module and a man-machine interaction module; the hand-held instrument shell module provides an integral internal frame and an external shell for the tester; the direct current resistance measuring module is used for automatically measuring the direct current resistance of the inductive load; the man-machine interaction module is used for inputting parameter setting information and outputting a test result.
The hand-held instrument shell module comprises an upper cover, a lower cover, a side plate, a bracket, a rubber sleeve and a handle belt; the side plate is positioned between the upper cover and the lower cover and is used for connecting the upper cover and the lower cover; the edges of the upper cover and the lower cover are both provided with rubber sleeves; a handle belt is fixed at the bottom of the lower cover; cavities are arranged in the lower cover and the upper cover and used for placing the direct current resistance measuring module and the human-computer interaction module; the outer surface of the upper cover is provided with a display screen opening for installing a liquid crystal display screen; the upper cover is also provided with a key for inputting instructions to the man-machine interaction module; a wiring terminal for mounting a test system is arranged on the side plate; the side plate is also provided with a printing interface which is used for being connected with a printer.
The direct current resistance measuring module comprises a relay switching unit, a constant current source circuit, a signal acquisition circuit, an A/D (analog/digital) converter and a central processing unit; the man-machine interaction module comprises a liquid crystal display unit, a keyboard operation unit, a data printing unit and a data storage unit; the liquid crystal display unit is connected with the liquid crystal display screen; the keyboard operation unit is connected with the keys; the data printing unit is connected with the printing interface.
The central processing unit is respectively connected with the constant current source circuit, the A/D analog-to-digital converter and the man-machine interaction module; the man-machine interaction module is in two-way communication with the central processing unit; the relay switching unit comprises a voltage switching channel and a current switching channel; the voltage switching channel is connected with the central processing unit through the signal acquisition circuit.
The constant current source circuit provides a stable test power supply for the test system of the device, outputs proper gear current and outputs the proper gear current to a test object through a wiring terminal of the side plate; the signal acquisition circuit is used for acquiring and amplifying signals input by the wiring terminal, then sending the signals to the A/D analog-to-digital converter for analog-to-digital conversion, and finally calculating a test result by the central processing unit.
The liquid crystal display screen is used for displaying the setting, the test state, the test result and other operation interfaces of the test parameters transmitted by the liquid crystal display unit; the keyboard operation unit is used for controlling all operations of keys on the instrument, wherein the keys comprise 'up', 'down', 'left', 'right', 'confirm' and 'return'.
The data storage unit comprises a data memory; the data memory is used for storing the local computer and storing the test data into the local computer, so that the local computer can conveniently look up the test data; the side plate is provided with a USB interface, the inside of the USB interface is connected with a data memory through a data line, and an external memory copies test data through the USB interface so as to lead the test data out to a computer for processing; the data printing unit may print out the test data through an external printer.
The upper cover, the lower cover, the side plates and the bracket are all made of plastic shells.
This device adopts lithium battery power module to supply power, electric connection between lithium battery power module and each power consumption part.
The direct current resistance measuring module of the device is also provided with a protection function module, and the protection function module is connected with the signal acquisition circuit; the protection function module comprises a power-off protection unit and a wire-breaking protection unit, wherein the wire-breaking protection unit is used for generating high back electromotive force when a breakpoint suddenly appears in a test loop in the test process, so as to protect the device from being damaged; the power-off protection unit is used for protecting the device from being damaged due to sudden power loss of the system in a starting-up state or a test process.
The lithium battery is arranged in the cavity of the lower cover; the support is used for placing of host computer, and the gum cover makes the host computer portable for the host computer provides the protection of taking precautions against earthquakes, handle area.
Compared with the prior art, the beneficial effects of the utility model are that: can be according to the size of on-the-spot test article resistance, the suitable electric current gear of automatic selection tests, compares with current like product, and work efficiency is high, and it is more convenient to let the test.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of the device of the present invention;
FIG. 2 is a block diagram of the working principle of the present invention;
fig. 3 is an exemplary diagram of the measurement process of the present invention.
In the figure: 1. upper cover, 2, lower cover, 3, curb plate, 4, gum cover, 5, handle area, 6, liquid crystal display, 7, button, 8, support.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings 1 to 3 and the specific embodiments.
Referring to the attached figure 1, the hand-held type inductive load direct current resistance automatic measuring device comprises a hand-held type instrument shell module, wherein the hand-held type instrument shell module comprises an upper cover 1, a lower cover 2, a side plate 3, a bracket 8, a rubber sleeve 4 and a handle belt 5; the side plate 3 is positioned between the upper cover 1 and the lower cover 2 and is used for connecting the upper cover 1 and the lower cover 2; the edges of the upper cover 1 and the lower cover 2 are both provided with rubber sleeves 4; a handle belt 5 is fixed at the bottom of the lower cover 2; cavities are arranged in the lower cover 2 and the upper cover 1 and used for placing a direct current resistance measuring module and a human-computer interaction module; a display screen opening is formed in the outer surface of the upper cover 1 and used for installing a liquid crystal display screen 6; the upper cover 1 is also provided with a key 7 for inputting instructions to the man-machine interaction module; a wiring terminal for mounting a test system is arranged on the side plate 3; the side plate 3 is also provided with a printing interface for connecting with a printer. The support 8 is used with the device in a matched mode and used for placing the device.
Referring to fig. 2, the hand-held inductive load direct current resistance automatic measuring device further comprises a direct current resistance automatic measuring module and a human-computer interaction module; the direct current resistance measuring module comprises a relay switching unit, a constant current source circuit, a signal acquisition circuit, an A/D (analog/digital) converter and a central processing unit; the man-machine interaction module comprises a liquid crystal display unit, a keyboard operation unit, a data printing unit and a data storage unit; the liquid crystal display unit is connected with the liquid crystal display screen; the keyboard operation unit is connected with the keys; the data printing unit is connected with the printing interface.
The central processing unit adopts a commercially available ARM processor.
The central processing unit is respectively connected with the constant current source circuit, the A/D analog-to-digital converter and the man-machine interaction module; the man-machine interaction module is in two-way communication with the central processing unit; the relay switching unit comprises a voltage switching channel and a current switching channel; the voltage switching channel is connected with the central processing unit through the signal acquisition circuit.
When the measurement work is carried out, the constant current source circuit generates test current required by the test and transmits the test current to the current wiring terminal; the voltage wiring terminal is an input end of a voltage signal generated by a test product, the voltage signal is transmitted to the signal acquisition unit through a voltage switching channel of the relay switching unit, effective signals are separated through signal conditioning and filtering, the effective signals are transmitted to the A/D analog-to-digital converter, the analog signals are converted into digital signals, the digital signals are finally transmitted to the central processing unit, the central processing unit calculates and arranges a test result, and the test result is output to the man-machine interaction module, so that the measurement is completed.
Fig. 3 shows a measurement embodiment of the present device, after entering an automatic current test program, the present device first starts a tiny test current to perform an initial test, calculates a resistance value (error is slightly larger), then selects a proper current gear according to the resistance value, compares the determined current gear with the current test current gear, increases the current gear to the selected current gear if the current is larger than the current gear, decreases the current gear to the selected current gear if the current is smaller than the current, and finally performs a second test to calculate the resistance value of the test sample. In the whole current adjusting process, repeated charge and discharge tests are not needed, so that the test time is saved.
The components and parts adopted by the device are all commercially available components and parts. The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto.
Claims (6)
1. A hand-held inductive load direct current resistance automatic measuring device is characterized in that: the device comprises a handheld instrument shell module, a direct current resistance automatic measurement module and a man-machine interaction module; the hand-held instrument shell module provides an integral internal frame and an external shell for the tester; the direct current resistance measuring module is used for automatically measuring the direct current resistance of the inductive load; the human-computer interaction module is used for inputting parameter setting information and outputting a test result;
the hand-held instrument shell module comprises an upper cover, a lower cover, a side plate, a bracket, a rubber sleeve and a handle belt; the side plate is positioned between the upper cover and the lower cover and is used for connecting the upper cover and the lower cover; the edges of the upper cover and the lower cover are both provided with rubber sleeves; a handle belt is fixed at the bottom of the lower cover; cavities are arranged in the lower cover and the upper cover and used for placing the direct current resistance measuring module and the human-computer interaction module; the outer surface of the upper cover is provided with a display screen opening for installing a liquid crystal display screen; the upper cover is also provided with a key for inputting instructions to the man-machine interaction module; a wiring terminal for mounting a test system is arranged on the side plate; the side plate is also provided with a printing interface which is used for connecting with a printer;
the direct current resistance measuring module comprises a relay switching unit, a constant current source circuit, a signal acquisition circuit, an A/D (analog/digital) converter and a central processing unit; the man-machine interaction module comprises a liquid crystal display unit, a keyboard operation unit, a data printing unit and a data storage unit; the liquid crystal display unit is connected with the liquid crystal display screen; the keyboard operation unit is connected with the keys; the data printing unit is connected with the printing interface;
the central processing unit is respectively connected with the constant current source circuit, the A/D analog-to-digital converter and the man-machine interaction module; the man-machine interaction module is in two-way communication with the central processing unit; the relay switching unit comprises a voltage switching channel and a current switching channel; the voltage switching channel is connected with the central processing unit through the signal acquisition circuit.
2. The apparatus according to claim 1, wherein: the keys include six keys, "up", "down", "left", "right", "confirm", and "back".
3. The apparatus according to claim 1, wherein: the data storage unit comprises a data memory; the data memory is used for local storage, and test data are stored in the local machine, so that the local machine can conveniently look up the test data.
4. A hand-held automatic measuring device for the direct current resistance of an inductive load according to claim 3, characterized in that: the side plate is provided with a USB interface, and the inside of the USB interface is connected with a data memory through a data line.
5. The apparatus according to claim 1, wherein: the upper cover, the lower cover, the side plates and the bracket are all made of plastic shells.
6. The apparatus according to claim 1, wherein: the direct current resistance measuring module is also provided with a protection function module, and the protection function module is connected with the signal acquisition circuit; the protection function module comprises a power-off protection unit and a disconnection protection unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021177918.0U CN212459857U (en) | 2020-06-23 | 2020-06-23 | Hand-held inductive load direct current resistance automatic measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021177918.0U CN212459857U (en) | 2020-06-23 | 2020-06-23 | Hand-held inductive load direct current resistance automatic measuring device |
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| Publication Number | Publication Date |
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| CN212459857U true CN212459857U (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021177918.0U Active CN212459857U (en) | 2020-06-23 | 2020-06-23 | Hand-held inductive load direct current resistance automatic measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325053A (en) * | 2021-12-30 | 2022-04-12 | 广州昆德半导体测试技术有限公司 | Four-probe resistivity and sheet resistance tester |
-
2020
- 2020-06-23 CN CN202021177918.0U patent/CN212459857U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325053A (en) * | 2021-12-30 | 2022-04-12 | 广州昆德半导体测试技术有限公司 | Four-probe resistivity and sheet resistance tester |
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