Summary of the invention
Fundamental purpose of the present invention be at above problem propose a kind of cheap, test accurately, reflect keying panel proving installation fast, reduce production costs, improve test speed.
An of the present invention purpose is to propose a kind of general proving installation that is suitable for testing various keying panels.
Another purpose of the present invention is to propose a kind of general proving installation with sound and Visual Display test result.
The object of the present invention is achieved like this: a kind of keying panel proving installation comprises amplifying unit 1, A/D converting unit 2 and signal processing unit 3, the input end of described amplifying unit 1 is used to connect the test a point of keying panel 4, the input end of output termination A/D converting unit 2, the output termination signal processing unit 3 of described A/D converting unit 2, in the described signal processing unit 3 the voltage handling procedure is arranged, be used for comparing with the test result record of test a point voltage or with standard and judging.
Wherein, signal processing unit 3 comprises microprocessor 5 that is used for computing and the storer 6 that is used for storage standards, and described storer 6 links to each other with microprocessor 5.
Test for the keying panel that is applicable to various types, the present invention also comprises and is used for pattern control module 11 and the unit 7 that control microprocessor 5 enters test pattern or mode of learning, the input end of described unit 7 is used to connect the test a point of keying panel 4, and output terminal links to each other with microprocessor 5.
Especially, for the ease of the identification test result, the present invention also comprises test result Tip element 8, is used for the result signal of received signal processing unit 3 and with sound and Visual Display.
The invention has the beneficial effects as follows: principle of the present invention is the dividing potential drop difference that a is ordered when utilizing different keys to be pressed, and the voltage range by setting different keys is as standard, and it is qualified that voltage that a is ordered and standard relatively judge whether.The present invention has also designed auditory tone cues and visual cues, and for key up to specification, proving installation will send corresponding sound and show that on display screen for the key that falls short of specifications, proving installation does not send any sound.Promptly relying on human eye to go to detect judgement with existing keying panel method of testing compares, the present invention relies on instrument test many accurately, and work efficiency improves greatly, by the dual prompting of sound and vision, having reduced the people is the probability of makeing mistakes, and has alleviated staff's labour intensity.The present invention also includes learning functionality, is directed to a kind of keying panel of new architecture, and the present invention tests the dividing potential drop of each key and also preserves as standard by selecting to be introduced into mode of learning, enters test pattern afterwards again.Thereby make this tester go for the test of the keying panel of various types, compare with the detection electrical equipment that existing type is incompatible, simple to operate, cost is low.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Be illustrated in figure 1 as circuit block diagram of the present invention, comprise amplifying unit 1, A/D converting unit 2 and signal processing unit 3, the input end of described amplifying unit 1 is used to connect the test a point of keying panel 4, the input end of output termination A/D converting unit 2, the output termination signal processing unit 3 of described A/D converting unit 2, in the described signal processing unit 3 the voltage handling procedure is arranged, be used for comparing with the test result record of test a point voltage or with standard and judging.
Described amplifying unit 1 can be the amplifying circuit that includes triode, also can be the amplifying circuit that includes operational amplifier.
Described signal processing unit 3 can be a computing machine, also can be to comprise an independent microprocessor 5 or include a microprocessor 5 and a storer 6.
Be illustrated in figure 1 as a kind of preferred forms of the present invention, amplifying unit 1 is for including the amplifying circuit of operational amplifier, its input end is used to connect the test a point of keying panel 4, carry out analog to digital conversion with exporting A/D converter 2 to after the amplification of a point voltage signal, the output terminal of A/D converter 2 links to each other with microprocessor 5.Storer 6 links to each other with microprocessor 5 by the I2C bus, is used for carrying out between microprocessor 5 and storer 6 read and write of data, and resistance R 14 and resistance R 15 are respectively the SCL pin of storer 6 and the pull-up resistor of SDA pin.Also comprise test result Tip element 8, be used to receive the result signal of microprocessor 5 and with sound and Visual Display, the concrete form at interface is as mellotron, recognize first key and then send the note of first scale " do ", recognize second key and then send the note of second scale " re ", recognize below the 3rd, the 4th ... key sends the note of " mi ", " fa ", " sol ", " la ", " xi " successively, and is presented on the liquid crystal display.If the resistance generation wrong plug of connecting or fault such as leak to insert and will not send any sound with key, if all keys all test passes send the prompting sound of keying panel test passes at last, and be shown on the display screen.If all buttons of keying panel to be measured all are not pressed, a point output 5V then, each button go here and there the resistance of different resistances, if SW1 is pressed, then the voltage of a point output is the dividing potential drop of 5V through R1, R2, if SW2 is pressed, then a point voltage is the dividing potential drop of 5V through R1, R3.Because R2, R3, R4, R5, R6, R7, the resistance of R16 has nothing in common with each other, therefore it is all different to press different key a point voltages, because the input resistance of A/D converter 2 is not high enough, the voltage (a point) of coming from keying panel must be introduced into the amplifying circuit that includes operational amplifier and cushion, be defeated by A/D converter 2 again, transformation result is delivered to the data port of microprocessor 5 by data line, microprocessor 5 judges whether in the voltage range of certain key according to the data that receive again, and test result is transferred to test result Tip element 8 from the P1.3 pin, test result Tip element 8 includes power amplifier and the LCD MODULE 9 that is used to drive the loudspeaker sounding.If in the voltage range of SW1 key, loudspeaker then sends the note of " do ", if in the voltage range of SW2 then send the note of " re ", SW3 correspondence " mi ", SW4 correspondence " fa ", SW5 correspondence " sol ", SW6 correspondence " la ", SW7 correspondence " xi " successively, LCDs shows the key that recognizes number simultaneously, if sounding not in any interval then not.Microprocessor 5 is constantly got in the circulation of a point voltage, interval judgement, sounding, power taking pressure, interval judgement, sounding of keying panel, and the keying panel tester is pressed certain key and then sent corresponding note just as mellotron like this, and loose key then stops sounding., send on all keys qualified prompting sound if all recognizing.Present embodiment comprises that also is used for a pattern control module 11 and the unit 7 that control microprocessor 5 enters test pattern or mode of learning, pattern control module 11 comprise be connected on and the 5V direct supply between switch S 1 and resistance R 16, ground connection behind the P3.3 pin tandem tap S1 of microprocessor 5, when switch S 1 is opened, the P3.3 pin of microprocessor 5 connects the 5V direct supply by pull-up resistor R16, when switch S 1 closure, the P3.3 pin ground connection of microprocessor 5, the closure each time of switch S 1, just import the pulse edge of a decline to microprocessor 5, microprocessor 5 whenever detects a negative edge, mode of operation with regard to conversion once promptly is transformed to mode of learning or is transformed to test pattern by mode of learning by test pattern.Unit 7 is for including the circuit of comparer 10, the input anode of comparer 10 is used to connect the test a point of keying panel 4, connect test a point by a current-limiting resistance R9, the input negative terminal connects the sliding end of rheostat R8 by current-limiting resistance R10, rheostat R8 is serially connected between 12V normal voltage and the ground, by rheostat R8 dividing potential drop, the reference voltage of comparer 10 is located at 4.9V.The output terminal of comparer 10 exports microprocessor 5 to after by resistance R 11 and R12 dividing potential drop.Shown in Fig. 4,5, when having any key, keying panel to be measured is pressed, the a point is all exported the voltage that is lower than 4.9V, 1 pin output low level of comparer 10, otherwise, do not have the key a point output 5V that is pressed then, the 1 pin output high level of comparer 10 is defeated by the P3.2 pin of microprocessor 5 through resistance R 11, R12 dividing potential drop.Arrive low level saltus step when the P3.2 of microprocessor 5 whenever detects a high level under learning state, microprocessor 5 is just thought has a key to press, so get a point voltage by amplifying unit, A/D converter, adds and allows positive and negative deviation.Obtain the voltage range of this key, P3.0, the P3.1 mouth by microprocessor 5 is stored in the storer 6 then.Storer 6 is an electrically-erasable memory, and the voltage range data that learning state is preserved down after the power down can not lost.
The present invention has improved test speed, has reduced false failure rate, only uses a keying panel proving installation can test the keying panel of all model televisors, greatly reduces testing cost.