CN203037729U - True RMS measuring meter - Google Patents
True RMS measuring meter Download PDFInfo
- Publication number
- CN203037729U CN203037729U CN 201320012412 CN201320012412U CN203037729U CN 203037729 U CN203037729 U CN 203037729U CN 201320012412 CN201320012412 CN 201320012412 CN 201320012412 U CN201320012412 U CN 201320012412U CN 203037729 U CN203037729 U CN 203037729U
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- China
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- module
- true rms
- measurement instrument
- control module
- load
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Abstract
The utility model provides a true RMS measuring meter comprising a receiving module, a signal conditioning module, a control module and a display module all connected in sequence, the measuring meter is also provided with an input module for inputting a voltage-current variable ratio; the control module is provided with an AD sampling circuit for collecting signals inputted by the signal conditioning module; the control module reads the signals collected by the AD sampling circuit, and calculates the true RMS according to the variable ratio inputted by the input module; the true RMS measuring meter employs a ZEN3309 chip to receive the signals collected by the AD sampling circuit, and calculates the true RMS; and through employing the ZEN3309 chip, a non-return-to-zero problem in large humidity can be solved, the voltage-current variable ratio can be changed, and the true RMS can be obtained according to needs.
Description
Technical field
The utility model is specifically related to a kind of true rms measurement instrument.
Background technology
True rms measurement instrument in the market mostly be to adopt the ICL7107 chip to make, and ICL7107 is digital voltage gauge outfit application-specific integrated circuit, can be used for making digital watch, can be used for measuring voltage, electric current, resistance, electric capacity behind the adjunct circuit, inductance, frequency, temperature, humidity etc.But the true rms measurement instrument that adopts the ICL7107 chip to do is difficult to change voltage, electric current no-load voltage ratio, when often occurring not having not input signal simultaneously, the situation of measured value also can occur, causes measurement result error to occur.
The utility model content
In order to solve the deficiency of above-mentioned technology, the purpose of this utility model provides a kind of true rms measurement instrument, its solved true rms measurement instrument in the past since not the error amount that the produces during input signal result that causes measuring and the deficiency of error appears.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of true rms measurement instrument, it comprises receiver module, signal condition module, control module and the display module that connects successively, described measurement instrument is provided with the load module for input voltage, electric current no-load voltage ratio value, described control module is provided with the AD sample circuit, described AD sample circuit is gathered the signal of the input of signal condition module, and control module reads the signal of AD sample circuit collection and the no-load voltage ratio value of load module input respectively.
Described signal condition module comprise the LM324 operational amplifier and with and peripheral circuit.
Described control module adopts the ZEN3309 chip.
Described load module comprises key-press module.
Described display module comprises charactron.
Described receiver module comprises current transformer and voltage transformer (VT).
The beneficial effects of the utility model are, the utility model receives the signal that the AD sample circuit is gathered by the ZEN3309 chip, and calculate its real effective, and adopt the ZEN3309 chip, can solve the non return to zero problem of high humidity, and can change voltage, electric current no-load voltage ratio value, draw real effective as requested.
Description of drawings
Fig. 1 is logical organization synoptic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further specified:
Referring to Fig. 1, the utility model comprises receiver module 3, signal condition module 2, control module 1 and the display module 5 that connects successively, described measurement instrument is provided with the load module 4 for input voltage, electric current no-load voltage ratio value, described control module 1 is provided with AD sample circuit 12, described AD sample circuit 12 is gathered the signal of the input of signal condition module 2, and control module 1 reads the signal of AD sample circuit 12 collections and the no-load voltage ratio value of load module 4 inputs respectively.
Described signal condition module 12 comprise the LM324 operational amplifier and with and peripheral circuit.
Described control module 1 adopts the ZEN3309 chip.
Described load module 4 comprises key-press module.
Described display module 5 comprises charactron.
Described receiver module 3 comprises current transformer and voltage transformer (VT).
The utility model is gathered current signal by current transformer, gather voltage signal by voltage transformer (VT), and current signal and the voltage signal that collects be input to signal condition module 2, signal condition module 2 adopts the peripheral circuit of LM324 operational amplifiers and formation thereof.
The LM324 operational amplifier has the four-operational amplifier of differential input, satisfies request for utilization of the present utility model, and this four-operational amplifier can be operated in low to 3.0 volts or high under 32 volts power supply, quiescent current be MC1741 quiescent current 1/5th.Common-mode input range comprises negative supply, thereby has eliminated the necessity that adopts the external bias element in many application scenarios, can realize the stationary state of low quiescent current, and its peripheral circuit is comparatively simple, avoids using complicated circuit.
Signal condition module 2 by LM324 operational amplifier formation, be input to control module 1 after the current signal that collects and voltage signal amplified, control module 1 adopts the ZEN3309 chip, this chip is 8-bit microcontroller, satisfy request for utilization of the present utility model, and its built-in AD sample circuit 12, has internal memory simultaneously, storage for the setting value of load module 4 input, load module 4 comprises key-press module, by key-press module control module 1 being carried out setting value revises, reach and freely set electric current, the demand of voltage change ratio value, control module 1 is gathered through signal condition modules 2 by AD sample circuit 12 and is amplified the signal of back input, and carries out computing according to the no-load voltage ratio value that load module 4 arranges and draw real effective, and the real effective that draws is shown at charactron by display module 5.
Embodiment should not be considered as restriction of the present utility model, but any improvement of doing based on spirit of the present utility model, all should be within protection domain of the present utility model.
Claims (6)
1. true rms measurement instrument, it comprises receiver module (3), signal condition module (2), control module (1) and the display module (5) that connects successively, it is characterized in that: described measurement instrument is provided with the load module (4) for input voltage, electric current no-load voltage ratio value, described control module (1) is provided with AD sample circuit (12), described AD sample circuit (12) is gathered the signal of the input of signal condition module (2), and control module (1) reads the signal of AD sample circuit (12) collection and the no-load voltage ratio value of load module (4) input respectively.
2. true rms measurement instrument according to claim 1 is characterized in that, described signal condition module (2) comprise the LM324 operational amplifier with and peripheral circuit.
3. true rms measurement instrument according to claim 1 is characterized in that, described control module (1) adopts the ZEN3309 chip.
4. true rms measurement instrument according to claim 1 is characterized in that, described load module (4) comprises key-press module.
5. true rms measurement instrument according to claim 1 is characterized in that, described display module (5) comprises charactron.
6. true rms measurement instrument according to claim 1 is characterized in that, described receiver module (3) comprises current transformer and voltage transformer (VT).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320012412 CN203037729U (en) | 2013-01-10 | 2013-01-10 | True RMS measuring meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320012412 CN203037729U (en) | 2013-01-10 | 2013-01-10 | True RMS measuring meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203037729U true CN203037729U (en) | 2013-07-03 |
Family
ID=48689840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320012412 Expired - Lifetime CN203037729U (en) | 2013-01-10 | 2013-01-10 | True RMS measuring meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203037729U (en) |
-
2013
- 2013-01-10 CN CN 201320012412 patent/CN203037729U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160627 Address after: 337000 Jiangxi city of Pingxiang province Chishan Industrial Park Patentee after: JIANGXI HJATIS POWER INDUSTRY Co.,Ltd. Address before: 325604, Jetta road 84, Liushi Town, Wenzhou, Zhejiang, Yueqing Patentee before: ZHEJIANG HUAJIAN ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |
|
| CX01 | Expiry of patent term |