CN201917896U

CN201917896U - Testing device for digital-analog signal conversion

Info

Publication number: CN201917896U
Application number: CN201020666084XU
Authority: CN
Inventors: 母德才
Original assignee: Kunshan Liantao Electronics Co Ltd
Current assignee: Kunshan Liantao Electronics Co Ltd
Priority date: 2010-12-17
Filing date: 2010-12-17
Publication date: 2011-08-03
Anticipated expiration: 2020-12-17

Abstract

The utility model discloses a testing device for digital-analog signal conversion, which is used for testing MDP (mini display port)-VGA (video graphics array) port products. The testing device consists of a computer mainframe, a display and a functional acquisition machine. An MDP signal port of the product to be tested is connected with a standard DP (display port) signal output port of the computer mainframe; a VGA signal output port of the product to be tested is connected with a VGA signal port of the functional acquisition machine; the computer mainframe is connected with the display and controls the display to work; a serial calculation communication port of the functional acquisition machine is connected with a serial port of the computer mainframe; the computer mainframe outputs standard DP signals to the product to be tested; the product to be tested converts the signal into the VGA signal and outputs the signal to the functional acquisition machine; and the functional acquisition machine performs VGA signal acquisition and transmits the acquisition data to the computer mainframe. By adopting the testing device, the full-automatic testing can be realized, the judgment range can be adjusted to be appropriate for part functional error of the product, and the quality of the product can be ensured. Therefore, the testing device has high testing accuracy, high efficiency, visual result display and usability and is applicable to quantity production.

Description

Digital and analogue signals conversion testing device

Technical field

The utility model relates to a kind of digital and analogue signals conversion testing device, and especially a kind of test MDP that is exclusively used in changes the digital and analogue signals conversion testing device of VGA interface product.

Background technology

MDP changes the VGA interface product because the function that involves is more when producing, as: standby allows display enter sleep, R-G-B signals distortion, EDID read functions, line frequency signal, field frequency signal, also has the detection that needs output voltage, a plurality of project testings such as working current power detection, traditional test all is by simulating the back with fine the seeing of eye, or all divides a lot of pacings to try with instrument, and what have is at all can't management and control proper, therefore the quality to product can not get controlling preferably, and efficient is also lower simultaneously.

Summary of the invention

In order to overcome above-mentioned defective, the utility model provides a kind of digital and analogue signals conversion testing device, realizes the automatic detection to product to be measured, saves manpower and shortens detection time.

The utility model for the technical scheme that solves its technical matters and adopt is:

A kind of digital and analogue signals conversion testing device, being used to test MDP changes the VGA interface product, is made up of host computer, display and function harvester; The MDP signaling interface of product to be measured connects the standard DP signal output of host computer, the VGA signaling interface of the VGA signal output linkage function harvester of product to be measured; Host computer connects display and controls display work; The serial ports computer communication interface of function harvester connects the serial ports of host computer; Described host computer outputting standard DP signal is in product to be measured; Described product to be measured is converted to the VGA signal and exports to the function harvester; Described function harvester carries out the VGA signals collecting and image data is transferred to host computer.

By research to the product principle, the professional application computing machine is done signal source, the dependence program is given full play to every function of single-chip microcomputer in concrete the enforcement, one one is automatically detected according to circuit function in sequence, determination range can conveniently be regulated to be fit to the product section functional error, to guarantee the quality of product simultaneously.

It realizes that principle is: the standard DP signal output output signal of host computer, signal by the programmed control under the self-editing Windows after the different state of output, pass through product to be measured again, reflecting different linear signals at VGA signal output end carries out signals collecting for the function harvester, again the data that collect are passed to host computer and calculate, obtain test result and show by display.

As further improvement of the utility model, establish the collection mainboard in the described function harvester, be integrated with AVR microprocessor, VGA interface impedance match circuit, crystal oscillator, serial ports level shifting circuit and display module on this collection mainboard; Described AVR microprocessor connects described serial ports computer communication interface by the serial ports level shifting circuit, this AVR microprocessor connects described VGA signaling interface by VGA interface impedance match circuit, described crystal oscillator provides the AVR microprocessor required clock signal, and the AVR microprocessor connects display by display module; Described collection mainboard connects mains-supplied.

As further improvement of the utility model, also be provided with hummer in the described function harvester, this hummer is subjected to AVR microprocessor Control work.

As further improvement of the utility model, also be integrated with key circuit, reset circuit and program download interface on the described collection mainboard, described function harvester also includes the button part; In the AVR microprocessor, reset circuit control AVR microprocessor resets the button part, program download interface and the transmission of AVR microprocessor data by key circuit transmission key command.

As further improvement of the utility model, described function harvester also includes power unit, and this power unit connects civil power by power pin, and civil power is converted to the operating voltage of gathering mainboard is powered at the collection mainboard; Also be integrated with operating voltage sampling and voltage stabilizing part on this collection mainboard, partly the sample operating voltage of power unit output and this operating voltage carried out voltage stabilizing of this operating voltage sampling and voltage stabilizing.

As further improvement of the utility model, the standard DP signal output of described host computer connects the output of computer video card by its pairing DP signal input part; Be provided with output voltage control and voltage and current sampling module between this DP signal input part and the standard DP signal output, the AVR microprocessor Communication Control of this output voltage control and voltage and current sampling module and function harvester.

The beneficial effects of the utility model are: the utility model is by the research to the product principle, use host computer and do signal source, signal goes out different linear signals through product afterreaction to be measured and carries out signals collecting for the function harvester, again the data that collect being passed to host computer calculates, obtaining test result shows by display, realize full-automatic the detection, determination range can conveniently be regulated to be fit to the product section functional error, to guarantee the quality of product simultaneously; Thereby test accuracy height of the present utility model, efficient height, intuitive display result, tool ease for use, use in being adapted at producing in batches.

Description of drawings

Fig. 1 is frame principles figure of the present utility model;

Fig. 2 is a catenation principle synoptic diagram of the present utility model.

Embodiment

Embodiment: a kind of digital and analogue signals conversion testing device, being used to test MDP changes the VGA interface product, is made up of host computer 1, display 2 and function harvester 3; The MDP signaling interface of product 4 to be measured connects the standard DP signal output of host computer 1, the VGA signaling interface 30 of the VGA signal output linkage function harvester 3 of product 4 to be measured; Host computer 1 connects display 2 and controls display 2 work; The serial ports computer communication interface 10 of function harvester 3 connects the serial ports of host computer 1; Described host computer 1 outputting standard DP signal is in product 4 to be measured; Described product to be measured 4 is converted to the VGA signal and exports to function harvester 3; Described function harvester 3 carries out the VGA signals collecting and image data is transferred to host computer 1.

It realizes that principle is: the standard DP signal output output signal of host computer 1, signal by the programmed control under the self-editing Windows after the different state of output, pass through product 4 to be measured again, reflecting different linear signals at VGA signal output end carries out signals collecting for function harvester 3, again the data that collect are passed to host computer 1 and calculate, obtain test result and show by display 2.

Establish the collection mainboard in the described function harvester 3, be integrated with AVR microprocessor, VGA interface impedance match circuit 31, crystal oscillator 32, serial ports level shifting circuit 33 and display module 34 on this collection mainboard; Described AVR microprocessor connects described serial ports computer communication interface 10 by serial ports level shifting circuit 33, this AVR microprocessor connects described VGA signaling interface 30 by VGA interface impedance match circuit 31, described crystal oscillator 32 provides the AVR microprocessor required clock signal, and the AVR microprocessor connects display 2 by display module 34; Described collection mainboard connects mains-supplied.

Also be provided with hummer 36 in the described function harvester 3, this hummer 36 is subjected to AVR microprocessor Control work.

Also be integrated with key circuit 37, reset circuit 38 and program download interface 39 on the described collection mainboard, described function harvester 3 also includes the button part; Button partly transmits key commands in the AVR microprocessor by key circuit 37, and reset circuit 38 control AVR microprocessors reset program download interface 39 and the transmission of AVR microprocessor data.

Described function harvester 3 also includes power unit 5, and this power unit 5 connects civil power by power pin, and civil power is converted to the operating voltage of gathering mainboard is powered at the collection mainboard; Also be integrated with operating voltage sampling and voltage stabilizing part 50 on this collection mainboard, the operating voltage of this operating voltage sampling and 5 outputs of voltage stabilizing part 50 sampling power units is also carried out voltage stabilizing to this operating voltage.

The standard DP signal output of described host computer 1 connects the output of computer video card by its pairing DP signal input part; Be provided with output voltage control and voltage and current sampling module 11 between this DP signal input part and the standard DP signal output, the AVR microprocessor Communication Control of this output voltage control and voltage and current sampling module 11 and function harvester 3.

Claims

1. a digital and analogue signals conversion testing device is used to test MDP commentaries on classics VGA interface product, it is characterized in that: be made up of host computer (1), display (2) and function harvester (3); The MDP signaling interface of product to be measured (4) connects the standard DP signal output of host computer (1), the VGA signaling interface (30) of the VGA signal output linkage function harvester (3) of product to be measured (4); Host computer (1) connects display (2) and controls display (2) work; The serial ports computer communication interface (10) of function harvester (3) connects the serial ports of host computer (1); Described host computer (1) outputting standard DP signal is in product to be measured (4); Described product to be measured (4) is converted to the VGA signal and exports to function harvester (3); Described function harvester (3) carries out the VGA signals collecting and image data is transferred to host computer (1).

2. digital and analogue signals conversion testing device according to claim 1, it is characterized in that: establish the collection mainboard in the described function harvester (3), be integrated with AVR microprocessor, VGA interface impedance match circuit (31), crystal oscillator (32), serial ports level shifting circuit (33) and display module (34) on this collection mainboard; Described AVR microprocessor connects described serial ports computer communication interface (10) by serial ports level shifting circuit (33), this AVR microprocessor connects described VGA signaling interface (30) by VGA interface impedance match circuit (31), described crystal oscillator (32) provides the AVR microprocessor required clock signal, and the AVR microprocessor connects display (2) by display module (34); Described collection mainboard connects mains-supplied.

3. digital and analogue signals conversion testing device according to claim 2 is characterized in that: also be provided with hummer (36) in the described function harvester (3), this hummer (36) is subjected to AVR microprocessor Control work.

4. digital and analogue signals conversion testing device according to claim 2, it is characterized in that: also be integrated with key circuit (37), reset circuit (38) and program download interface (39) on the described collection mainboard, described function harvester (3) also includes the button part; Button partly transmits key command in the AVR microprocessor by key circuit (37), and reset circuit (38) control AVR microprocessor resets, program download interface (39) and the transmission of AVR microprocessor data.

5. digital and analogue signals conversion testing device according to claim 2, it is characterized in that: described function harvester (3) also includes power unit (5), this power unit (5) connects civil power by power pin, and civil power is converted to the operating voltage of gathering mainboard is powered at the collection mainboard; Also be integrated with operating voltage sampling and voltage stabilizing part (50) on this collection mainboard, the operating voltage of this operating voltage sampling and voltage stabilizing part (50) sampling power units (5) output is also carried out voltage stabilizing to this operating voltage.

6. digital and analogue signals conversion testing device according to claim 2 is characterized in that: the standard DP signal output of described host computer (1) connects the output of computer video card by its pairing DP signal input part; Be provided with output voltage control and voltage and current sampling module (11) between this DP signal input part and the standard DP signal output, the AVR microprocessor Communication Control of this output voltage control and voltage and current sampling module (11) and function harvester (3).