CN109975612A - A kind of simple automatic resistance test device - Google Patents
A kind of simple automatic resistance test device Download PDFInfo
- Publication number
- CN109975612A CN109975612A CN201711465830.1A CN201711465830A CN109975612A CN 109975612 A CN109975612 A CN 109975612A CN 201711465830 A CN201711465830 A CN 201711465830A CN 109975612 A CN109975612 A CN 109975612A
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- Prior art keywords
- resistance
- pressure drop
- module
- measured resistance
- measured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to a kind of simple automatic resistance test devices, comprising: power module makes the measured resistance output modeled pressure drop for providing constant current to measured resistance；A/D conversion module is connected with the measured resistance, and the modeled pressure drop for exporting the measured resistance is converted into corresponding digital pressure drop；Processing module is controlled, is connect with the A/D conversion module, for calculating the resistance value of the measured resistance according to the constant current and the digital pressure drop；Display module, for the resistance value of the digital form output display control calculated measured resistance of processing module.The present invention, which provides constant current to measured resistance by power module, makes the measured resistance export modeled pressure drop, the modeled pressure drop is converted into digital pressure drop through A/D conversion module, then the resistance value of measured resistance is calculated according to constant current and digital pressure drop by control processing module, and be output to display module and show, to realize simple progress resistance test.
Description
Technical field
The present invention relates to a kind of resistance testing device more particularly to a kind of simple automatic resistance test devices.
Background technique
Resistance meter is electrical safety detection and the indispensable tool of earth work examination, includes earth resistance
Instrument, Insulation Resistance Tester, sheet resistance tester, instrument for measuring DC resistance and circuit resistance tester etc., resistance test
Instrument will usually carry out automatic zero set and range swithching in use.Current resistance meter is carrying out automatic zero set and amount
When journey is converted, potentiometer and range shift switch are generally used, and potentiometer and range shift switch failure rate are higher, maintenance fiber crops
It is tired.
Summary of the invention
A kind of simple automatic resistance test device is provided it is an object of the invention to overcome the shortcomings of above-mentioned technology.
To achieve the above object, the invention adopts the following technical scheme:
A kind of simple automatic resistance test device, comprising:
Power module makes the measured resistance output modeled pressure drop for providing constant current to measured resistance；
A/D conversion module is connected with the measured resistance, and the modeled pressure drop for exporting the measured resistance is converted into phase
The digital pressure drop answered；
Processing module is controlled, is connect with the A/D conversion module, for being calculated according to the constant current and the digital pressure drop
The resistance value of the measured resistance out；
Display module, for the resistance of the digital form output display control calculated measured resistance of processing module
Value.
The control processing module uses single-chip microcontroller.
The display module is light-emitting diode display.
The display module is LCD display.
The simple automatic resistance test device includes automatic gear switching module, is connect with the control processing module,
For carrying out the switching of different test gears automatically according to the actual conditions of the measured resistance.
The present invention, which provides constant current to measured resistance by power module, makes the measured resistance export modeled pressure drop, warp
The modeled pressure drop that the measured resistance exports is converted into corresponding digital pressure drop by A/D conversion module, then handles mould by control
Block is used to calculate the resistance value of the measured resistance according to the constant current and the digital pressure drop, and is output to display module
With the resistance value of the digital form output display control calculated measured resistance of processing module, to realize simple
Carry out resistance test.
Detailed description of the invention
Fig. 1 is a kind of simple automatic resistance schematic structural diagram of testing device provided in an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing and the preferred embodiment specific embodiment that the present invention will be described in detail.
As shown in Figure 1, the figure shows a kind of simple automatic resistance test device principle knots provided in an embodiment of the present invention
Structure illustrates only the related part of the embodiment of the present invention for ease of description.
As shown in Figure 1, a kind of simple automatic resistance test device, comprising:
Power module makes the measured resistance output modeled pressure drop for providing constant current to measured resistance；
A/D conversion module is connected with the measured resistance, and the modeled pressure drop for exporting the measured resistance is converted into phase
The digital pressure drop answered；
Processing module is controlled, is connect with the A/D conversion module, for being calculated according to the constant current and the digital pressure drop
The resistance value of the measured resistance out；
Display module, for the resistance of the digital form output display control calculated measured resistance of processing module
Value.
In the embodiment of the present invention, the control processing module uses single-chip microcontroller C8051F020.
In the embodiment of the present invention, the display module is light-emitting diode display.
In the embodiment of the present invention, the display module is LCD display.
In the embodiment of the present invention, the simple automatic resistance test device includes automatic gear switching module, with the control
Processing module connection processed, for carrying out the switching of different test gears automatically according to the actual conditions of the measured resistance.
In the embodiment of the present invention, the automatic gear switching module can be controlled using relay and be realized.
The embodiment of the present invention carries out not automatically by automatic gear switching module, according to the actual conditions of the measured resistance
With the switching of test gear, there is automatic resistance screening function, meet the variability of test object, improve measurement accuracy,
It is intelligent convenient for realizing instrument, there is corresponding flexibility and practicability, sexual valence is relatively high, simple for structure.
The present invention saves failure by realizing automatic zero set and range swithching with software is set in the control processing module
The higher potentiometer of rate and range shift switch.Adjusting zero method is that single-chip microcontroller self-test after booting is attended school if system is working properly
The result for taking A/D to convert.After continuously reading 6 A/D transformation results, judge whether they are both less than 0.1 Ω, if continuous 6
A value is both less than 0.1 Ω, and at this moment just finding out wherein minimum value will subtract initially as initial value, later each measurement result
Value.Otherwise, it is that prod is reliably not short-circuit to be considered as operator, instrument continues display zeroing prompt.Range switching has been wanted
It works at 3: being the number of significant digit for switching the enlargement ratio of precision amplifier, then being adjustment initial value first, be finally that adjustment is small
The position of several points.
At room temperature, it is measured using precision resistance of the apparatus of the present invention to several known resistance values, then calculates survey
Magnitude measures the same resistance with multimeter, the data measured is compared: at 100 ohm of resistance scale value, measured value
99.9 ohm, 99.8 ohm of multimeter measured value；At 1000 ohm of resistance scale value, 990 ohm of measured value, multimeter measurement
980 ohm of value.When screening to the resistance of a unknown resistance value: 460 Ω of input value inputs 1% measured value of allowable error
462 Ω, the selection result are qualified；2440 Ω of input value inputs 0.5% measured value of allowable error, 2446 Ω, and the selection result is qualified.
This system realizes simple automatic resistance test function using monolithic processor controlled mode, and the intelligence for completing resistance measurement is set
Meter.System performance is excellent, stablizes, and circuit is simple, and low in energy consumption, measurement accuracy is higher, and relative error is easy to operate less than 1%, adjusts
It tries and easy to maintain, there is stronger practicability and very wide application prospect.
The present invention, which provides constant current to measured resistance by power module, makes the measured resistance export modeled pressure drop, warp
The modeled pressure drop that the measured resistance exports is converted into corresponding digital pressure drop by A/D conversion module, then handles mould by control
Block is used to calculate the resistance value of the measured resistance according to the constant current and the digital pressure drop, and is output to display module
With the resistance value of the digital form output display control calculated measured resistance of processing module, to realize simple
Carry out resistance test.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of simple automatic resistance test device characterized by comprising
Power module makes the measured resistance output modeled pressure drop for providing constant current to measured resistance；
A/D conversion module is connected with the measured resistance, and the modeled pressure drop for exporting the measured resistance is converted into phase
The digital pressure drop answered；
Processing module is controlled, is connect with the A/D conversion module, for being calculated according to the constant current and the digital pressure drop
The resistance value of the measured resistance out；
Display module, for the resistance of the digital form output display control calculated measured resistance of processing module
Value.
2. simple automatic resistance test device according to claim 1, which is characterized in that the control processing module is using single
Piece machine.
3. simple automatic resistance test device according to claim 1, which is characterized in that the display module is that LED is shown
Device.
4. simple automatic resistance test device according to claim 1, which is characterized in that the display module is that LCD is shown
Device.
5. any one of -4 simple automatic resistance test device according to claim 1, which is characterized in that the simple automatic electric
Hindering test device includes automatic gear switching module, is connect with the control processing module, for according to the measured resistance
Actual conditions carry out the switching of different test gears automatically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711465830.1A CN109975612A (en) | 2017-12-28 | 2017-12-28 | A kind of simple automatic resistance test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711465830.1A CN109975612A (en) | 2017-12-28 | 2017-12-28 | A kind of simple automatic resistance test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109975612A true CN109975612A (en) | 2019-07-05 |
Family
ID=67075340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711465830.1A Pending CN109975612A (en) | 2017-12-28 | 2017-12-28 | A kind of simple automatic resistance test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109975612A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848388A (en) * | 2021-08-18 | 2021-12-28 | 东风电驱动系统有限公司 | Method and system for realizing resistor digitization by adopting parallel connection of matrix resistors |
-
2017
- 2017-12-28 CN CN201711465830.1A patent/CN109975612A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848388A (en) * | 2021-08-18 | 2021-12-28 | 东风电驱动系统有限公司 | Method and system for realizing resistor digitization by adopting parallel connection of matrix resistors |
| CN113848388B (en) * | 2021-08-18 | 2024-03-12 | 东风电驱动系统有限公司 | Method and system for realizing resistance digitalization by adopting matrix resistor parallel connection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190705 |