CN105629059A - Signal detection method - Google Patents
Signal detection method Download PDFInfo
- Publication number
- CN105629059A CN105629059A CN201410598031.1A CN201410598031A CN105629059A CN 105629059 A CN105629059 A CN 105629059A CN 201410598031 A CN201410598031 A CN 201410598031A CN 105629059 A CN105629059 A CN 105629059A
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- detection
- enters
- ltc2393
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to a signal detection method. The signal detection method is composed of the following steps: a detected signal enters into a detection device through a probe; fixed-multiple attenuation processing is performed on the signal through a pre-attenuation circuit, and then the signal goes through an impedance matching circuit; the system has a good signal inhalation capability, and the signal is enabled to be undistorted to the maximum limit; filtering is performed on the signal; a circuit after the filtering is shunted, one path enters into a programmed control amplifier, A/D conversion is performed on the signal after amplification, and, finally, the signal is sampled via an STM32 processor; and the other path enters into a waveform conversion circuit and then enters into the STM32 processor to calculate the frequency of the signal. Numerical computation of a complex analog circuit is reduced, and an expected technical effect is achieved; detection for a sine wave signal, detection for a square wave signal, detection for a triangular wave signal and detection for other signals are achieved, and an original waveform of a current detected signal can be displayed in real time relying on various algorithms of a built-in chip STM32 in signal detection; and the method is simple, and is easy to operate.
Description
Technical field
The present invention relates to a kind of signal detecting method.
Background technology
Electronic machine is needed to be operated in the even many rugged environments in outdoor for a long time in a lot of fields at present, although for its varying environment being suitable at the beginning of instrument design, have at hardware aspect and much design targetedly, the event of the instrument damage however caused because of nature or anthropic factor in outdoor environment also can happen occasionally, owing to lacking the conventional electronic machine detection equipment such as oscillograph, signal generator thus be not easy to it is carried out real-time detection, can only quit work brings it back into laboratory with good conditionsi and detects.
Summary of the invention
It is contemplated that propose a kind of signal detecting method.
Technical program of the present invention lies in:
A kind of portable signal detection method, is made up of following steps:
Step 1: measured signal enters detecting device by popping one's head in;
Step 2: by signal by preposition attenuator circuit, be fixed the attenuation processing of multiple, by impedance matching circuit; System is made to have good suction signal capabilities undistorted signal to greatest extent;
Step 3: above-mentioned signal is filtered;
Step 4: filtered circuit is tapped, a road enters programmable amplifier, and the signal after amplification carries out A/D conversion again, is finally sampled via STM32 processor by this signal;
Step 5: another road enters waveform changing circuit, enters back into the frequency of STM32 processor signal calculated.
Preferably, the low-pass filter circuit that described filter circuit is made up of LC.
Or preferably, described A/D change-over circuit is made up of two chips of LT6350 and LTC2393-16, wherein LTC2393-16 is A/D conversion chip and LT6350 is the driving chip of LTC2393-16, is accessed the input of LT6350 by converting interface through the single-ended sine wave signal of programmable amplifier.
The method have technical effect that:
The present invention not only decreases the numerical computations of complicated analog circuit, simultaneously in performance and functionally also no less than traditional design, reach intended technique effect, achieve the detection including the signals such as sine wave, square wave, triangular wave, signal detection relies on the various algorithm process of its built-in chip STM32 can show current measured signal original waveform in real time, the inventive method is simple, it is easy to operation.
Detailed description of the invention
Measured signal of the present invention enters detecting device by popping one's head in, for ensureing that system has wider measurement scope, so first having to signal is fixed the attenuation processing of multiple, system is made to have good suction signal capabilities undistorted signal to greatest extent by impedance matching, followed by filter circuit, its design process of the low-pass filter circuit being made up of LC adopted here is similar with signal generation apparatus. Signal is thus divided into two-way, one tunnel enters programmable amplifier, signal is made to be amplified signal processing before entering A/D change-over circuit, make signal in the optimal input range of A/D change-over circuit, reduce the full scale equal error of A/D change-over circuit to greatest extent, transfer analogue signal to digital signal by A/D change-over circuit and sampled by STM32 processor. An other road then enters waveform changing circuit, and its effect is the square-wave signal that sine wave etc. is converted to rule, enters STM32 processor, to facilitate STM32 internal counter to work, and the frequency of signal calculated.
In analog signal detection in particular for the small-signal even context of detection of small-signal, programmable amplifier plays an important role, owing to the conversion accuracy of A/D converter limits to some extent, can not be identified by A/D converter when the amplitude of measured signal is so little that, it is accomplished by first being amplified signal processing inputting the sampling of A/D modular converter again, but the amplitude of measured signal has certain excursion. Its signal amplitude that normally can detect is between lOmV��8V, consider to will also be subjected to the decay of 2 times in front end, the voltage range so entering A/D is 5mV��4V, there is certain dynamic range, the amplification of required amplifier also must be variable, to adapt to different measured signal frequency, will use programmable amplifier here, the present invention have selected the design of PGA207 and PGA206 four combination, and its theoretical amplification reaches as high as 6400 times.
A/D change-over circuit is made up of two chips of LT6350 and LTC2393-16, wherein for A/D conversion chip, LT6350 is the driving chip of LTC2393-16 to LTC2393 16, and the single-ended sine wave signal through programmable amplifier passes through converting interface and accesses the input of LT6350.
Its Main Function of waveform changing circuit is to be compared with ground through comparator by tested sine wave signal, produces square-wave signal and enters processor, and square-wave signal rising edge or the trailing edge of input are counted to reach to realize the purpose of frequency detecting by processor.
Claims (3)
1. a signal detecting method, it is characterised in that: it is made up of following steps:
Step 1: measured signal enters detecting device by popping one's head in;
Step 2: by signal by preposition attenuator circuit, be fixed the attenuation processing of multiple, by impedance matching circuit; System is made to have good suction signal capabilities undistorted signal to greatest extent;
Step 3: above-mentioned signal is filtered;
Step 4: filtered circuit is tapped, a road enters programmable amplifier, and the signal after amplification carries out A/D conversion again, is finally sampled via STM32 processor by this signal;
Step 5: another road enters waveform changing circuit, enters back into the frequency of STM32 processor signal calculated.
2. such as claim 1 signal detecting method, it is characterised in that: the low-pass filter circuit that described filter circuit is made up of LC.
3. such as claim 1 signal detecting method, it is characterized in that: described A/D change-over circuit is made up of two chips of LT6350 and LTC2393-16, wherein LTC2393-16 is A/D conversion chip and LT6350 is the driving chip of LTC2393-16, is accessed the input of LT6350 by converting interface through the single-ended sine wave signal of programmable amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410598031.1A CN105629059A (en) | 2014-10-31 | 2014-10-31 | Signal detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410598031.1A CN105629059A (en) | 2014-10-31 | 2014-10-31 | Signal detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105629059A true CN105629059A (en) | 2016-06-01 |
Family
ID=56044181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410598031.1A Pending CN105629059A (en) | 2014-10-31 | 2014-10-31 | Signal detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105629059A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675324A (en) * | 2016-01-20 | 2016-06-15 | 南京熊猫电子股份有限公司 | Device for detecting performance of inverter welding machine via supersonic waves |
| CN107462759A (en) * | 2016-06-06 | 2017-12-12 | 上海北京大学微电子研究院 | Test board for static discharge current waveforms detection |
| CN117388673A (en) * | 2023-12-11 | 2024-01-12 | 珠海芯业测控有限公司 | ATE equipment and chip testing method thereof, electronic equipment and storage medium |
-
2014
- 2014-10-31 CN CN201410598031.1A patent/CN105629059A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675324A (en) * | 2016-01-20 | 2016-06-15 | 南京熊猫电子股份有限公司 | Device for detecting performance of inverter welding machine via supersonic waves |
| CN107462759A (en) * | 2016-06-06 | 2017-12-12 | 上海北京大学微电子研究院 | Test board for static discharge current waveforms detection |
| CN117388673A (en) * | 2023-12-11 | 2024-01-12 | 珠海芯业测控有限公司 | ATE equipment and chip testing method thereof, electronic equipment and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102445600A (en) | Optimization method based on traditional phase difference measurement and circuit | |
| CN206292586U (en) | A kind of self adaptation apparatus for detecting weak signal based on FPGA | |
| CN203433080U (en) | Non-contact electrical-equipment discharge-monitoring device based on technology of ultraviolet pulse detection | |
| CN103389447A (en) | Non-contact ultraviolet pulse discharge monitoring device | |
| CN107329163A (en) | A kind of multichannel pulse size analyzer | |
| CN105629059A (en) | Signal detection method | |
| CN103323681A (en) | System and method for detecting three-dimensional alternating electromagnetic radiation | |
| CN206540960U (en) | A kind of pulse signal parameter measurement instrument | |
| CN203012023U (en) | A LCR tester | |
| CN202886471U (en) | Multi-channel leakage current phase difference detection equipment | |
| CN203859727U (en) | Device for detecting weak signals | |
| CN107765085A (en) | A kind of signal supervisory instrument and method | |
| CN201917612U (en) | Phase difference measuring device | |
| CN107390106B (en) | Air-core reactor fault location circuit | |
| CN105572482A (en) | Enclosed space electric field measurement device | |
| CN202583057U (en) | Probe signal processing circuit for infrared gas sensor | |
| CN107561360B (en) | A kind of sinusoidal signal method for measuring phase difference based on FPGA and subtraction circuit | |
| CN206362943U (en) | Water signal supervisory instrument is visited in a kind of magnetic resonance with HDR | |
| CN104034989A (en) | Capacitive touch sensor tester | |
| CN203838249U (en) | Nondestructive detection device used for measuring dielectric properties of tomatoes | |
| CN209673219U (en) | A kind of audio signal analysis device based on FFT | |
| CN203337384U (en) | Full-automatic bearing vibration tester | |
| CN106405295B (en) | The condition detection method of analog quantity of power distribution terminal input channel, device and system | |
| CN204166138U (en) | Based on the Multi channel spectrum analysis instrument of ADS1605 | |
| CN201156063Y (en) | Transformer tester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160601 |
|
| WD01 | Invention patent application deemed withdrawn after publication |