CN207440207U - A kind of long-range Test Apparatus for Amplitude Frequency - Google Patents

A kind of long-range Test Apparatus for Amplitude Frequency Download PDF

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Publication number
CN207440207U
CN207440207U CN201721589673.0U CN201721589673U CN207440207U CN 207440207 U CN207440207 U CN 207440207U CN 201721589673 U CN201721589673 U CN 201721589673U CN 207440207 U CN207440207 U CN 207440207U
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module
circuit
microcontroller
test
long
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时文豪
周福贵
高珊珊
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Anhui Normal University
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Anhui Normal University
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Abstract

The utility model discloses a kind of long-range Test Apparatus for Amplitude Frequencies, include signal source, amplifier module and amplitude versus frequency characte test circuit;Signal source includes DDS circuit, control module and key-press module, and key-press module is connected with control module, and control module is connected with DDS circuit;DDS circuit is connected with amplifier module;Amplitude versus frequency characte test circuit includes ADC acquisition modules, OLED module, WIFI module and microcontroller, amplifier module is connected with ADC acquisition modules, ADC acquisition modules are connected by microcontroller with OLED module, microcontroller is connected by phase inverter with control module, and microcontroller is connected by WIFI module with router LAN.The utility model realizes amplitude versus frequency characte test function using less hardware circuit so that circuit performance is more powerful, and price is cheaper on the premise of data accuracy is met, easy to operate, and student is facilitated to carry.The amplitude versus frequency characte of test signal can be transmitted at a distance, is the useful supplement of the test equipments such as traditional sweep generator, and there is good promotional value.

Description

A kind of long-range Test Apparatus for Amplitude Frequency
Technical field
The utility model is related to amplitude versus frequency characte testing field, more particularly, to a kind of long-range Test Apparatus for Amplitude Frequency.
Background technology
What is frequently encountered in electronic surveying is exactly impedance to circuit network and the measurement of transmission characteristic.Amplitude versus frequency characte is exactly Important transmission characteristic, amplitude-versus-frequency curve can intuitively reflect attenuation journey of the network (such as wave filter) to different frequency Degree, so as to draw the correlated performance of network.Largely even all of function is all using hard to traditional amplitude versus frequency characte tester Part circuit is realized, thus causes equipment heavy, function setting very flexible, and expensive, scaling difficulty;Especially only Energy on-the-spot test lacks transmission and the communication function of data.
Utility model content
It is the defects of to overcome the prior art, small the purpose of this utility model is to provide a kind of light weight, it can long distance Long-range Test Apparatus for Amplitude Frequency from measurement.
The utility model solves technical problem and adopts the following technical scheme that:
A kind of long-range Test Apparatus for Amplitude Frequency, including signal source, amplifier module and amplitude versus frequency characte test circuit;It is described Signal source includes DDS circuit, control module and key-press module, and the key-press module is connected with control module, the control module It is connected with DDS circuit;The DDS circuit is connected with amplifier module;The amplitude versus frequency characte test circuit includes ADC and gathers mould Block, OLED module, WIFI module and microcontroller, the amplifier module are connected with ADC acquisition modules, the ADC acquisition modules It is connected by microcontroller with OLED module, the microcontroller is connected by phase inverter with control module, and the microcontroller passes through WIFI module is connected with router LAN.
Further, the DDS circuit uses AD9851 chips, and output terminal uses low-pass filter, the AD9851 cores Piece output terminal is connected with low-pass filter.
Further, the control module is made of STC89C52 chips and peripheral circuit.
Further, primary using triode emitter follower in the amplifier module, intergrade is by AD603 grades of two-stage Join, final stage uses THS3091.
Further, the microcontroller uses STM32F103 chips.
Further, the WIFI module is ESP8266 modules.
The utility model has the advantage of:Amplitude versus frequency characte test function is realized using less hardware circuit so that circuit Performance is more powerful, light-weight, small, and price is more cheap and operation side on the premise of data accuracy is met Just, and student is facilitated to carry.The amplitude versus frequency characte of test signal can be transmitted at a distance, be having for the test equipments such as traditional sweep generator Benefit supplement, has good promotional value.
Description of the drawings
Fig. 1 is the functional block diagram of the utility model;
Fig. 2 is the AD9851 chips and built-up circuit of the utility model signal source DDS circuit;
Fig. 3 is the utility model amplifier module intergrade circuit diagram;
Fig. 4 is the oscillogram of the utility model oscilloscope display.
Shown in figure:1st, amplifier output waveforms, 2, signal source output sinusoidal signal.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work All other embodiments obtained shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of long-range Test Apparatus for Amplitude Frequency, is surveyed including signal source, amplifier module and amplitude versus frequency characte Try circuit, signal source include DDS circuit, control module and key-press module, amplitude versus frequency characte test circuit include ADC acquisition modules, OLED module and WIFI module and microcontroller.
Signal source realizes that frequency is 997kHz-50MHz, and voltage is the output signal of 4.56mV-1V.Using AD9851 chips DDS circuit is formed, output terminal uses the low-pass filter of 70MHz, and making the SN of waveform, AD9851 is active using 30MHZ than more preferable Crystal oscillator is, it can be achieved that 6 frequencys multiplication, clock frequency are up to 180MHz.Key-press module can realize adjusting and the frequency sweep mode of frequency Unlatching.Control module is made of STC89C52 chips and peripheral circuit, can easily be controlled by STC89C52 AD9851 is operated in serial mode so as to generate sinusoidal signal, and realizes frequency sweep mould using the method for loop control word register Formula.The minimum signal that exports is adjusted as 4.56mv in the precision potentiator in 3 200k Europe in parallel after low-pass filter, and output wave Shape is substantially good, the problem of overcoming EMI, and STC89C52 chips can realize 1Mhz frequency steps using interrupt mode, by surveying It tries the signal source stable output signal and power consumption is smaller.
Amplifier module prime improves input impedance using triode emitter follower circuit, makes amplifier mould by calculating Block input impedance reaches 600 Ω, and intergrade is cascaded by two-stage AD603, and electricity is varied and controlled by adjustment precision potentiometer Pressure controls voltage range to realize 0-40dB controllable gains for -1.2-2V.Final stage improves the work of carrying load ability using THS3091 With so that in the case where loading as 600 Europe, output voltage reaches as high as 1.2v, and waveform realizes large gain without apparent distortion. It is connected between circuits at different levels by 50 Ω coaxial cables, realizes signal undistorted transmission.
The control core of whole device is amplitude versus frequency characte test circuit, and wherein microcontroller uses STM32F103 chips.ADC The ADC channel of acquisition module, that is, STM32F103, the output voltage in measuring signal source and the voltage of amplifier module output terminal, And a resistor voltage divider circuit is devised before AD gathers port, the limitation of microcontroller 3.3v voltages is broken through, is sent out by testing Existing maximum collection voltages are up to 9.8v.STM32F103 is connected with OLED, can be in OLED moulds by continuously improving programmed algorithm The amplitude-frequency variation of signal is shown on the screen of block, but there are the distortions of indivedual frequency points.And STM32F103 passes through phase inverter 74LS04 can be connected with STC89C52, be adjusted so as to directly control the output of signal source signal, realize that microcontroller is synchronous.
By twisted-pair feeder and the amplitude versus frequency characte survey of the frequency information of signal source, one 2m long of output signal of amplifier module Trial assembly, which is put, to be linked up, and amplitude versus frequency characte test circuit accurate can show amplitude-versus-frequency curve on OLED screen curtain, with not having Basic indifference when connecting twisted-pair feeder, and on oscillograph display amplifier module output signal amplitude versus frequency characte, lost without apparent Very.Local area network is built using WIFI routers, TCP communication agreement is set, STM32F103 passes through WIFI module, that is, ESP8266 Module is connected with router LAN, and the amplitude versus frequency characte of signal is sent to by LAN on laptop, using autonomous The upper computer software of design is connected to router LAN, so as to obtain information and be exported with curve mode display amplifier module The amplitude versus frequency characte of signal.
While there has been shown and described that the embodiment of the utility model, for the ordinary skill in the art, It is appreciated that in the case where not departing from the principle of the utility model and spirit can these embodiments be carried out with a variety of variations, repaiied Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.

Claims (6)

1. a kind of long-range Test Apparatus for Amplitude Frequency, it is characterised in that:It is tested including signal source, amplifier module and amplitude versus frequency characte Circuit;The signal source includes DDS circuit, control module and key-press module, and the key-press module is connected with control module, described Control module is connected with DDS circuit;The DDS circuit is connected with amplifier module;The amplitude versus frequency characte test circuit includes ADC Acquisition module, OLED module, WIFI module and microcontroller, the amplifier module are connected with ADC acquisition modules, and the ADC is adopted Collection module is connected by microcontroller with OLED module, and the microcontroller is connected by phase inverter with control module, the microcontroller It is connected by WIFI module with router LAN.
2. a kind of long-range Test Apparatus for Amplitude Frequency according to claim 1, it is characterised in that:The DDS circuit uses AD9851 chips, output terminal use low-pass filter, and the output terminal of the AD9851 chips is connected with low-pass filter.
3. a kind of long-range Test Apparatus for Amplitude Frequency according to claim 1, it is characterised in that:The control module by STC89C52 chips and peripheral circuit composition.
4. a kind of long-range Test Apparatus for Amplitude Frequency according to claim 1, it is characterised in that:In the amplifier module Primary is cascaded using triode emitter follower, intergrade by two-stage AD603, and final stage uses THS3091.
5. a kind of long-range Test Apparatus for Amplitude Frequency according to claim 1, it is characterised in that:The microcontroller uses STM32F103 chips.
6. a kind of long-range Test Apparatus for Amplitude Frequency according to claim 1, it is characterised in that:The WIFI module is ESP8266 modules.
CN201721589673.0U 2017-11-24 2017-11-24 A kind of long-range Test Apparatus for Amplitude Frequency Active CN207440207U (en)

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CN201721589673.0U CN207440207U (en) 2017-11-24 2017-11-24 A kind of long-range Test Apparatus for Amplitude Frequency

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CN201721589673.0U CN207440207U (en) 2017-11-24 2017-11-24 A kind of long-range Test Apparatus for Amplitude Frequency

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110568259A (en) * 2019-08-27 2019-12-13 西安科技大学 Remote amplitude-frequency characteristic measuring device
CN112415293A (en) * 2019-08-21 2021-02-26 华东师范大学 Amplitude-frequency characteristic measuring instrument and method based on stm32

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112415293A (en) * 2019-08-21 2021-02-26 华东师范大学 Amplitude-frequency characteristic measuring instrument and method based on stm32
CN110568259A (en) * 2019-08-27 2019-12-13 西安科技大学 Remote amplitude-frequency characteristic measuring device

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