Summary of the invention
The present invention provides a kind of communication device interface parameter test device, and its technical solution is as follows:
A kind of interface parameters test device of communication equipment, described device include: audio signal generation module, isolation and widthSpend adjustment module, rectification module, analog/digital conversion resume module module, D A switch module, display module, level adapted mouldBlock, the first connector K1 for connecting with the audio input interface of tested communication equipment, is used to be tested with described amplification moduleCommunication equipment audio output interface connection the second connector K2, for the control output interface with the tested communication equipmentThe third connector K3 of connection, the 4th connector K4 connecting for the control input interface with the tested communication equipment,One gating switch S1, the second gating switch S2, third gating switch S3, the 4th gating switch S4, singal source resistance artifical resistanceR, the first load resistance R1With the second load resistance R2；
The output end of the audio signal generation module with it is described be isolated and the input terminal of amplitude adjusted module connect, it is describedThe output end of isolation and amplitude adjusted module is connect with one end of the singal source resistance artifical resistance r, the singal source resistanceThe other end of artifical resistance r connects with the contact c of the contact a of the first gating switch S1 and second gating switch respectivelyIt connects, the contact b of the first gating switch S1 is connect with the first connector K1；The input terminal of the rectification module with it is describedThe contact a connection of second gating switch S2, the contact b of the second gating switch S2 are connect with the second connector K2, instituteThe output end for stating rectification module is connect with the contact c of the third gating switch S3, the contact a of the third gating switch S3 withThe input terminal of the analog/digital conversion module connects, and the contact b of the third gating switch S3 is defeated with the level adapted moduleOutlet connection, the input terminal of the level adapted module are connect with the third connector K3；
The output end of the analog/digital conversion module is connect with the processing module；The input terminal of the D A switch moduleIt is connect with the processing module, the output end of the D A switch module is connect with the input terminal of the amplification module, described to putThe output end of big module is connect with the 4th connector K4, and the display module is connect with the processing module；
The first load resistance R1One end connect with the contact a of the 4th gating switch S4, it is described first loadResistance R1The other end ground connection；The contact c of the 4th gating switch S4 respectively with the second connector K2 and described secondThe contact b connection of gating switch S2；The second load resistance R2One end input terminal with the level adapted module respectivelyIt is connected with the third connector K3, the second load resistance R2The other end ground connection；It is the first gating switch S1, describedThe control terminal d of second gating switch S2, the third gating switch S3 and the 4th gating switch S4 respectively with the placeManage module connection.
Further, the audio signal generation module is by operational amplifier O1, crystal diode T11, crystal diodeT12, resistance R11, resistance R12, resistance R13, resistance R14With capacitor C11, capacitor C12The wien bridge oscillator of composition.
Further, the isolation and amplitude adjusted module include operational amplifier O21, operational amplifier O22, potentiometerW, capacitor C21, capacitor C22With capacitor C23；
The capacitor C21One end connect with the output end of the audio signal generation module, the capacitor C21It is anotherEnd and the operational amplifier O21Non-inverting input terminal connection, the operational amplifier O21Inverting input terminal and the operationAmplifier O21Output end connection, the capacitor C22One end and the operational amplifier O21Output end connection, the capacitorC22The other end connect with one end of the potentiometer W, the other end of potentiometer W ground connection, the adjustable side of the potentiometer WWith the operational amplifier O22Non-inverting input terminal connection, the operational amplifier O22Inverting input terminal put with the operationBig device O22Output end connection, the capacitor C23One end and the operational amplifier O22Output end connection, the capacitor C23The other end connect with one end of the singal source resistance artifical resistance r.
Further, the rectification module includes operational amplifier O31, operational amplifier O32, crystal diode T3, capacitorC31, capacitor C32, resistance R31With adjustable resistance R32；
The capacitor C31One end connect with the contact a of the second gating switch S2, the capacitor C31The other end withThe operational amplifier O31Non-inverting input terminal connection, the operational amplifier O31Inverting input terminal and the operation amplifierDevice O31Output end connection, the crystal diode T3Anode with the operational amplifier O31Output end connection, the crystalline substanceBody diode T3Cathode and the operational amplifier O32Non-inverting input terminal connection, the operational amplifier O32Anti-phase inputEnd and the operational amplifier O32Output end connection, the operational amplifier O32Output end and the third gating switchThe contact c connection of S3；
The capacitor C32One end and the operational amplifier O32Non-inverting input terminal connection, the capacitor C32It is anotherEnd ground connection, the resistance R31One end and the operational amplifier O32Non-inverting input terminal connection, the resistance R31The other endGround connection, the adjustable resistance R32With the operational amplifier O32Zeroing end connection.
Further, the analog/digital conversion module is analog/digital conversion integrated circuit.
Further, the D A switch module includes D/A switch integrated circuit.
Further, the D A switch module further includes operational amplifier O6With adjustable resistance R6, the D/A switchIntegrated circuit respectively with operational amplifier O6Non-inverting input terminal connected with inverting input terminal, the operational amplifier O6OutputEnd is connect with the amplification module, the adjustable resistance R6With the operational amplifier O6Zeroing end connection.
Further, the level adapted module includes operational amplifier O8, resistance R81, resistance R82With adjustable resistance R83；
The operational amplifier O8Non-inverting input terminal connect with the third connector K3, the operational amplifier it is samePhase input terminal also with the second load resistance R2One end connection, the resistance R81One end and the operational amplifier O8'sInverting input terminal connection, the resistance R81The other end ground connection；The resistance R82One end and the operational amplifier O8It is anti-The connection of phase input terminal, the resistance R82The other end and the operational amplifier O8Output end connection, the operational amplifierO8Output end connect with the contact b of the third gating switch S3, the adjustable resistance R83With the operational amplifier O8'sThe connection of zeroing end.
Further, the amplification module includes operational amplifier O9, resistance R91, resistance R92, resistance R93And adjustable resistanceR94；
The resistance R91One end and the operational amplifier O9Reverse input end connection, the resistance R91The other endGround connection, the operational amplifier O9Inverting input terminal also with the resistance R92One end connection, the resistance R92The other endWith the operational amplifier O9Output end connection, the resistance R93One end and the operational amplifier O9Output end connectIt connects, the resistance R93The other end connect with the 4th connector, the operational amplifier O9Noninverting input with it is describedThe output end of D A switch module connects, the adjustable resistance R94With the operational amplifier O9Zeroing end connection.
Further, described device further includes key module, and the key module is connect with the processing module, described to pressKey module includes test pattern selection key P1, measurement action sequence start key P2, increment key P3With decrement key P4。
Technical solution provided in an embodiment of the present invention has the benefit that
The test device incorporates the function of a variety of testing meter and instruments, solves communication equipment and tested in interface parametersCheng Zhong, because measuring instrument used is more, bring measuring instrument carries, installation, arranges inconvenient problem.Processing mould in the present apparatusBlock has automatic computing function, can automatically record several intermediate test datas, and pass through in the interface test process of communication equipmentCalculating provides final required as a result, simplifying several intermediate data of manual record, and postmenstruation arranges to calculate and obtains required knot againThe complicated processes of fruit, and the possible mistake of manual procedure is avoided, improve the accuracy of test result.In addition,The test device can also be automatically controlled by preset program in relation to the connection between contact in gating switch according to different measurement patternsState, and then change each intermodule connection relationship, play similar manual change's difference instrument and equipment in existing measurement methodBetween wiring effect, the problem of avoiding p-wire misconnection, missing generation, while reducing setting up time improves test effectRate.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, with reference to the accompanying drawing to embodiment of the present inventionIt is described in further detail.
Fig. 1 is a kind of interface parameters test device structural block diagram of communication equipment provided in an embodiment of the present invention, such as Fig. 1 instituteShow, which includes:
Audio signal generation module 100 (hereinafter referred to as module 100), isolation and 200 (hereinafter referred to as mould of amplitude adjusted moduleBlock 100), rectification module 300 (hereinafter referred to as module 100), analog/digital conversion module 400 (hereinafter referred to as module 100), processing mouldBlock 500 (hereinafter referred to as module 100), D A switch module 600 (hereinafter referred to as module 100), display module 700 are (hereinafter referred to asModule 100), level adapted module 800 (hereinafter referred to as module 100), amplification module 900 (hereinafter referred to as module 100), forFirst connector K1 (hereinafter referred to as K1) of the audio input interface connection of tested communication equipment, for tested communication equipmentSecond connector K2 (hereinafter referred to as K2) of audio output interface connection, connect for the control output interface with tested communication equipmentThe third connector K3 (hereinafter referred to as K3) connect, the 4th connector being connect for the control input interface with tested communication equipmentK4 (hereinafter referred to as K4), the first gating switch S1 (hereinafter referred to as S1), the second gating switch S2 (hereinafter referred to as S2), third gatingSwitch S3 (hereinafter referred to as S3), the 4th gating switch S4 (hereinafter referred to as S4), singal source resistance artifical resistance r are (hereinafter referred to as r),First load resistance R1(hereinafter referred to as R1) and the second load resistance R2(hereinafter referred to as R2)。
Referring to Fig. 1, the output end of module 100 is connect with the input terminal of module 200, the output end of module 200 and one end of rConnection, the other end of r are connect with the contact c of the contact a and S2 of S1 respectively, and the contact b of S1 is connect with K1.
The contact a connection of the input terminal and S2 of module 300, the contact b of S2 are connect with K2, the output end and S3 of module 300Contact c connection, the contact a of S3 connect with the input terminal of module 400, and the contact b of S3 is connect with the output end of module 800, mouldThe input terminal of block 800 is connect with K3.
The output end of module 400 is connect with module 500, and the input terminal of module 600 is connect with module 500, module 600 it is defeatedOutlet is connect with the input terminal of module 900, and the output end of module 900 is connect with K4.Module 700 is connect with module 500.
R1One end and S4 contact a connection, R1The other end ground connection.The contact c of S4 connects with the contact b of K2 and S2 respectivelyIt connects.R2One end connect respectively with the input terminal of module 800 and K3, R2The other end ground connection.
The control terminal d of S1, S2, S3 and S4 are connect with module 500 respectively.
The test device incorporates the function of a variety of testing meter and instruments, solves communication equipment and tested in interface parametersCheng Zhong, because measuring instrument used is more, bring measuring instrument carries, installation, arranges inconvenient problem.Processing mould in the present apparatusBlock has automatic computing function, can automatically record several intermediate test datas, and pass through in the interface test process of communication equipmentCalculating provides final required as a result, simplifying several intermediate data of manual record, and postmenstruation arranges to calculate and obtains required knot againThe complicated processes of fruit, and the possible mistake of manual procedure is avoided, improve the accuracy of test result.In addition,The test device can also be automatically controlled by preset program in relation to the connection between contact in gating switch according to different measurement patternsState, and then change each intermodule connection relationship, play similar manual change's difference instrument and equipment in existing measurement methodBetween wiring effect, the problem of avoiding p-wire misconnection, missing generation, while reducing setting up time improves test effectRate.
In the present embodiment, parameter test device further includes key module 1000, and key module 1000 and module 500 connectIt connects.
Further, parameter test device further includes power module (not shown), each in parameter test deviceModule is connect with power module, the voltage of power module output+5V ,+12V and ± 15V, to meet modules in deviceVoltage requirements.The wherein power supply termination+5V power supply of module 400, module 500, module 600, module 700 and module 1000, S1,Power supply termination+12V the power supply of S2, S3, S4, the power supply termination ± 15V power supply of remaining each module.
Fig. 2 is a kind of circuit diagram of communication device interface parameter test device provided in an embodiment of the present invention, whereinModule 100 is by operational amplifier O1, crystal diode T11And T12, resistance R11, resistance R12, resistance R13, resistance R14And capacitorC11, capacitor C12The wien bridge oscillator of composition, is used as audio signal source in the present apparatus.
Specifically, O1Noninverting input and R11One end connection, R11The other end and C11One end connection, C11It is anotherOne end and O1Output end connection, O1Noninverting input and R12One end connection, R12The other end ground connection；O1Input in the same directionEnd is gone back and C12One end connection, C12The other end ground connection.
O1Reverse input end and R13One end connection, R13The other end and T11Anode connection, T11Cathode and O1'sOutput end connection, T12It is connected in parallel on T11On.O1Reverse input end also with R14One end connection, R14The other end ground connection.O1It is defeatedOutlet is connect with the input terminal of module 200.
Other structures mode also can be used in module 100, for example, by using the single-chip integration electricity that can generate sinusoidal audio signalRoad etc..
Module 200 includes operational amplifier O21, operational amplifier O22, potentiometer W, capacitor C21, capacitor C22, capacitor C23。Wherein O21And O22It is connected into voltage follower circuit, the high input impedance having using voltage follower circuit and low input impedanceCharacteristic realizes that the signal buffer between the input terminal and output end of module 200 is isolated, avoids influencing each other between front stage.C21、C22、C23Play isolated DC.The amplitude for the audio signal that W is exported for adjustment module 200 makes the audio letter of outputNumber level value reach setting value.
Specifically, C21One end connect with the output end of module 100, C21The other end and O21Non-inverting input terminal connection,O21Inverting input terminal and O21Output end connection, C22One end and operational amplifier O21Output end connection, C22It is anotherEnd is connect with one end of W, the other end ground connection of W, the adjustable side of W and O22Non-inverting input terminal connection, O22Inverting input terminal withO22Output end connection, C23One end and O22Output end connection, C23The other end and r one end connect.
Potentiometer W in the embodiment of the present invention can be any current potential such as rotating potentiometer or plug-type potentiometerDevice.By adjusting potentiometer W, the Audio Meter value that module 200 can be made to export reaches setting value.
Rectification module 300 includes operational amplifier O31, operational amplifier O with direct current zero-bit control characteristic32, crystalDiode T3, capacitor C31, capacitor C32, resistance R31With adjustable resistance R32.Wherein O31And O32It is connected into voltage follower circuit, O31'sInput terminal is alternatively coupled to A point or B point, O through S231Output end be connected to by T3、C31And R31The halfwave rectifier filtered electrical of compositionRoad input terminal.O32Input terminal be connected to aforementioned halfwave rectifier filter circuit output end, O32Output end be connected to the contact of S3c。O31、O32Between the input terminal and halfwave rectifier filter circuit of the voltage follower circuit realization rectification module 300 of composition, halfSignal buffer between wave current rectifying and wave filtering circuit and the output end of rectification module 300 is isolated.C31A point or B point are come from for couplingAC signal and isolated DC signal, R32For O32Direct current zero-bit adjust.
Specifically, C31One end and S2 contact a connection, C31The other end and O31Non-inverting input terminal connection, O31It is anti-Phase input terminal and O31Output end connection, T3Anode and O31Output end connection, T3Cathode and O32Non-inverting input terminal connectIt connects, O32Inverting input terminal and O32Output end connection, O32Output end and S3 contact c connection.
C32One end and O32Non-inverting input terminal connection, C32The other end ground connection, R31One end and O32Homophase inputEnd connection, R31The other end ground connection, R32With O32Zeroing end connection.
Module 400 includes analog/digital conversion integrated circuit, and module 400 will be for that will come from 300 output end of module or module 800The DC level signal of output end is converted to for the digital signal of 500 acquisition process of module.
Module 600 includes D/A switch integrated circuit, the operational amplifier O with direct current zero-bit control characteristic6, andAdjustable resistance R6.Module 600 is used to the digital signal from 500 output end of module being converted to corresponding direct currentIt is flat.Wherein R6For O6Direct current zero-bit adjust.
Specifically, D/A switch integrated circuit respectively with O6Non-inverting input terminal connected with inverting input terminal, O6OutputEnd is connect with module 900, R6With O6Zeroing end connection.
Module 800 includes the operational amplifier O with direct current zero-bit control characteristic8, resistance R81, resistance R82And adjustable resistanceR83.For module 800 for what will be inputted from K3, variation range is that the DC level signal of 0V~12V is transformed to the defeated of module 400Enter the DC level signal for holding acceptable 0V~5V range.Wherein R83For O8Direct current zero-bit adjust.R81With R82RatioDetermine the input terminal of module 800 to the conversion proportion of output end level.
Specifically, O8Non-inverting input terminal connect with K3, O8Non-inverting input terminal also with R2One end connection, R81One endWith O8Inverting input terminal connection, R81The other end ground connection, R82One end and O8Inverting input terminal connection, R82The other end withO8Output end connection, O8Output end and S3 contact b connection, R83With O8Zeroing end connection.
Module 900 includes the operational amplifier O with direct current zero-bit control characteristic9, resistance R91, resistance R92, resistance R93WithAdjustable resistance R94.Module 900 is used to the DC level signal that the range exported from module 600 is 0V~5V being transformed to this dressLevel range needed for setting measurement is the DC level signal of 0V~12V, and is sent to tested communication equipment control interface through K4.ItsMiddle R94For O9Direct current zero-bit adjust.R91With R92Ratio, determine input terminal the putting to output end level of module 900Large scale.
Specifically, R91One end and O9Reverse input end connection, R91The other end ground connection, O9Inverting input terminal also withR92One end connection, R92The other end and O9Output end connection, R93One end and O9Output end connection, R93The other endIt is connect with K4, O9Noninverting input connect with the output end of module 600, R94With O9Zeroing end connection.
In Fig. 2, four gating switch S1, S2, S3, S4 structures are identical, by relay KA, crystal diode TA, crystalTriode TBWith resistance RKIt constitutes.Four gating switches are realized between different modules under the control signal function of module 500Gating, construct corresponding measuring signal access for different measurement patterns.
By taking S1 as an example, TAThe coil both ends of relay KA are connected in parallel on, one end of the coil of relay KA and power module connectIt connects, the other end and T of the coil of relay KABCollector connection, TBEmitter ground connection, TBBase stage and RKOne end connectIt connects, RKThe other end connect with module 500.
Key module 1000 is by key P1、P2、P3、P4With resistance RP1、RP2、RP3And RP4It constitutes.Operator passes through keyModule 1000 inputs various operational orders to module 500.By the way that resistance R is arrangedP1、RP2、RP3And RP4Can prevent super-high-current intoEntering module 500 causes module 500 to be damaged.
Specifically, P1One end connect with module 500, P1The other end ground connection, RP1One end and P1One end connection, RP1The other end connect with power module.P2One end connect with module 500, P2The other end ground connection, RP2One end and P2One endConnection, RP2The other end connect with power module.P3One end connect with module 500, P3The other end ground connection, RP3One end withOne end of P3 connects, RP3The other end connect with power module.P4One end connect with module 500, P4The other end ground connection, RP4One end and P4One end connection, RP4The other end connect with power module.
In the present embodiment, key P1For test pattern selection key, for selecting various operating modes.Such as when by oneLower key P1When, then " audio input interface input resistance test pattern " is selected, double-clicks key P when connecting1When, then select " audioOutput interface output resistance test pattern " etc., and so on.It, can also be by the selection feelings of above-mentioned mode when carrying out model selectionCondition is shown in module 700, so that tester intuitively sees which kind of test pattern be specifically chosen.
Key P2Start key for measurement action sequence, for starting the test process of the present apparatus.Choosing test mouldAfter formula, by pressing the button P2It can start the test action sequence of corresponding parameter.For example, " audio input interface is defeated for selectionEnter resistance test mode " after state, press the button P2, the present apparatus is i.e. under the control of control module 500, the sequentially related choosing of connectionPass is opened up, related module is sequentially connected, constitutes different test signal circuits, test and temporary tested communication equipment audio input connectThe parameters of mouth, and it is computed the input resistance for showing tested communication equipment audio input interface.
Key P3It can be increment key, for being controlled in the control signal threshold value of testing and control input interface or testWhen the level value of the control signal of output interface processed output, number from module 500 to 600 transmission level value of module that be gradually increasedSignal.
Key P4It can be decrement key, for being controlled in the control signal threshold value of testing and control input interface or testWhen the level value of the control signal of output interface processed output, number from module 500 to 600 transmission level value of module that be gradually reducedSignal.
It should be noted that the number of keys in mode selection module 1000 can be set according to actual needs multiple, sheetIt invents without limitation.
Display module 700 can use commercially available generic liquid crystal display module, be connected by standard serial interface and module 500It connects, provides test pattern, state and the display for measuring numerical value for the present apparatus.
Processing module 500 can be by one-chip computer integrated circuit, oscillating crystal and several resistance, capacitor in usual mannerConnect and compose one-chip computer circuit.
R can be not less than 0.25W using tolerance power consumption, and nominal resistance is the resistance of 300 Ω ± 10%.R1It can use resistance toIt is not less than 0.25W by power consumption, nominal resistance is the resistance of 600 Ω ± 5%, R20.25W, mark can be not less than using tolerance power consumptionResistance value is referred to as the resistance of 5.1k Ω ± 10%.
It should be noted that each module of the device, in addition to it can press foregoing circuit element and connection type composition, except spyDo not mentionlet alone it is bright other than (such as the operational amplifier with zero-bit regulatory function), can also be using other circuit elements and otherConnection type is constituted.Such as audio signal generation module 100, transistor and attached capacitance-resistance original part can also be used, by electricity such as double T bridgesRoad connection type is constituted, or directlys adopt monolithic integrated optical circuit composition.For having the element for being particularly limited to explanation, example in textSuch as " operational amplifier with direct current zero-bit control characteristic ", should regulation illustratively select.
The operating procedure and process of present apparatus test communication device interface parameter are used below in conjunction with Brief Description Of Drawings:
One, testing audio input interface input resistance R01
The audio input interface of tested communication equipment is connect with K1.Press the button P1, select " testing audio input interfaceAfter input resistance " mode, P is pressed the button2, start to measure.The contact a and b that module 500 controls S1 at this time are disconnected, and control S2'sContact a is connected with c, and the contact a for controlling S3 is connected with c.The audio signal that then module 100 generates successively is sent through module 200, r, S2Enter module 300, reaches module 400 after module 300 is rectified into DC level signal, then through S3.Module 400 is by this DC levelSignal is converted to digital signal and is sent into module 500, and module 500 acquires (not connected tested communication equipment audio input interface) at this timeThe digital signal got obtains one level value in Fig. 2 at A point, is denoted as U1。
Then module 500 controls contact a and the b closure of S1, and obtains the digital signal that module 400 exports, module again500 acquisitions (connect at this time and are tested communication equipment audio input interface) digital signal got, retrieve another of A pointLevel value is denoted as U2。
The U that module 500 is obtained according to above-mentioned steps1、U2With the numerical value of known r, R is calculated as follows01:
R01=U2×r/(U1-U2)。
Finally, module 500 is by calculated R01Output to display module 700 is shown.
Two, the output resistance R of testing audio output interface02
When testing output resistance, it is divided into following two situation:
1, being tested communication equipment itself can produce audio output signal:
The audio output interface of tested communication equipment is connect with K2, tested communication equipment is operated and generates audio signal.It pressesLower key P1, after selecting " output resistance 1 of testing audio output interface " mode, press the button P2, start to measure.Module 500 is controlledThe contact a of S2 processed is connected with b, and the contact a for controlling S3 is connected with c, and the contact a and c for controlling S4 are disconnected.It is tested communication equipment at this timeThe audio signal of output is successively sent into module 300 through K2, S2, is sent into after module 300 is rectified into DC level signal, then through S3Module 400.This DC level signal is converted to digital signal and is sent into module by module 400 in the case where module 500 controls signal function500, (B point does not access R to the acquisition of module 500 at this time1) digital signal that gets, a level value in Fig. 2 at B point is obtained,It is denoted as U1。
Then module 500 controls contact a and the c closure of S4, and obtains the digital signal that module 400 exports, module again(B point accesses R at this time for 500 acquisitions1) digital signal that gets, another level value at B point is retrieved, U is denoted as2。
Module 500 is according to the U of acquisition1、U2With known R1Numerical value, R is calculated as follows02:
R02=(U1-U2)×R1/U2。
Finally, module 500 is by calculated R02Output to display module 700 is shown.
2, audio signal cannot be generated by being tested communication equipment itself:
The audio input interface of tested communication equipment is connect with K1, audio output interface is connect with K2.Press the button P1,After " output resistance 2 of the testing audio output interface " mode of selection, P is pressed the button2, start to measure.The touching of the control of module 500 S1Point a is connected with b, and the contact a for controlling S2 is connected with b, and the contact a for controlling S3 is connected with c, and the contact a and c for controlling S4 are disconnected.ThisWhen the audio signal that generates of module 100 successively enter the audio input interface of tested communication equipment through module 200, r, K1, and fromTested communication equipment audio output interface output, is sent into module 300 through K2, S2, is rectified into DC level signal through module 300Afterwards, then through S3 it is sent into module 400.This DC level signal is converted to digital signal and is sent into module 500, module 500 by module 400(B point does not access R at this time for acquisition1) digital signal that gets, it obtains a level value at B point and is denoted as U1。
Then module 500 controls contact a and the c closure of S4, and obtains the digital signal that module 400 exports, module again(B point accesses R at this time for 500 acquisitions1) digital signal that gets, another level value at B point is obtained, U is denoted as2。
The U that module 500 is obtained according to above-mentioned steps1、U2With known R1Numerical value, R is calculated as follows02:
R02=(U1-U2)×R1/U2。
Finally, module 500 is by calculated R02Output to display module 700 is shown.
Three, the signal level U of testing audio output interface output01
Test U01Divide following two situation:
1, being tested communication equipment itself can produce audio signal output:
The audio output interface of tested communication equipment is connect with K2, tested communication equipment is operated and generates audio signal.It pressesLower key P1, after selecting " signal level 1 of testing audio output interface output " mode, press the button P2, start to measure.ProcessingThe contact a that module 500 controls S2 is connected with b, and the contact a for controlling S3 is connected with c, and the contact a for controlling S4 is connected with c.At this time byThe audio signal for surveying communication equipment output is successively sent into module 300 through K2, S2, after module 300 is rectified into DC level signal,Module 400 is sent into through S3 again.This DC level signal is converted to digital signal and is sent into module 500 by module 400, and module 500 is adopted(B point accesses R to collection at this time1) digital signal that gets, it obtains the level value at B point and is denoted as U01.Then by module 500 by U01It is defeatedIt is shown out to display module 700.
2, audio signal output cannot be generated by being tested communication equipment itself:
The audio input interface of tested communication equipment is connect with K1, audio output interface is connect with K2.Press the button P1,After " output resistance 2 of the testing audio output interface " mode of selection, P is pressed the button2, start to measure.The touching of the control of module 500 S1Point a is connected with b, and the contact a for controlling S2 is connected with b, and the contact a for controlling S3 is connected with c, and the contact a for controlling S4 is connected with c.ThisWhen the audio signal that generates of module 100 successively enter the audio input interface of tested communication equipment through module 200, r, K1, and fromTested communication equipment audio output interface output, is sent into module 300 through K2, S2, is rectified into DC level signal through module 300Afterwards, then through S3 it is sent into module 400.This DC level signal is converted to digital signal and is sent into module 500, module 500 by module 400(B point accesses R at this time for acquisition1) digital signal that gets, the level value for obtaining B point is denoted as U01.Then by module 500 by U01It is defeatedIt is shown out to display module 700.
Four, the control signal threshold value U of testing and control input interface11
Wherein, the threshold value for controlling input interface input control signal is that tested communication equipment control input interface inputsThe level of control signal is when changing from low to high or from high to low, just cause tested state of communication equipment change this whenCarve the level value of corresponding input.The state change of communication equipment include communication equipment generate appreciable audiovisual state change orThe level state of communication equipment output designating signal occurs height and changes.
Test U11Divide following two situation:
1, the control signal condition for being tested communication equipment control output interface output is controlled by the input of tested communication equipmentControl signal:
Such situation can be divided into two kinds of measurement patterns again:
A) manual control measurement pattern
The control input interface of tested communication equipment is connect with K4, be tested communication equipment control signal output interface withK3 connection.Press the button P1, after selecting " the control signal threshold value 1 of manual control measurement control input interface " mode, pressKey P2, start to measure.The contact a that module 500 controls S3 is connected with b.P is gradually pressed the button again3(or P4), make module 500 toModule 600 is sent since corresponding minimum (or maximum) level value, the digital signal of constantly incremental (or successively decreasing).Module 600The digital signal is converted into correspondingly DC level signal and is sent into module 900, then the control through K4 to tested communication equipmentInput interface input level value processed passs the DC level signal of rank variation from low to high (or from high to low).Module 500 will correspond toThe digital signal of output level is sent to display module 700 and gives real-time display, at the same to via connector K3, module 800,The level value of the control signal for the tested communication equipment control output interface output that S3,400 Measurement channel of module acquire is supervisedIt surveys.For incremental (or successively decreasing) speed for accelerating level in test process, down state can be kept after pressing P3 (or P4) keyIt does not put.
When the control signal of discovery control output interface output is in undergoing the adjacent change procedure of input signal twice, electricityWhen level values change, the level value U for the digital signal that the record of module 500 is sent to module 700 this moment11(as control inputThe control signal threshold value of interface), keep this numerical value no longer to change, and send out the mark completing threshold level and testing to module 700Will signal.
B) automatic control survey mode
The control input interface of tested communication equipment is connect with K4, be tested communication equipment control signal output interface withK3 connection.Press the button P1, after selecting " the control signal threshold value 1 of automatic control survey control input interface " mode, pressKey P2, module 500 control S3 contact a connected with b.P is pressed the button again3(or P4), start automatic measurement, module 500 is automaticIt is sent since corresponding minimum (or maximum) level value to module 600, the digital signal of constantly incremental (or successively decreasing).ModuleThe digital signal is constantly converted into correspondingly DC level signal and is sent into module 900 by 600, is then set through K4 to tested communicationStandby control input interface input level value passs the DC level signal of rank variation from low to high (or from high to low).Module 500The digital signal of corresponding output level is sent to display module 700 and gives real-time display, while to via connector K3, module800, S3,400 Measurement channel of module acquisition tested communication equipment control output interface output control signal level value intoRow monitoring.
When the control signal of discovery control output interface output is in undergoing the adjacent change procedure of input signal twice, electricityWhen level values change, the level value U of the record of module 500 digital signal that module 500 is sent to module 700 this moment11It (as controlsThe control signal threshold value of input interface processed), keep this numerical value no longer to change, and send out to module 700 and complete threshold level surveyThe marking signal of examination.
2, when the level value variation of the control signal of tested communication equipment input interface input only causes tested communication equipmentWhen generating the state changes such as external appreciable audiovisual:
Such situation can be divided into two kinds of measurement patterns again:
A) manual control measurement pattern
The control input interface of tested communication equipment is connect with K4.Press the button P1, selection " manual measurement control inputAfter the 2 " mode of control signal threshold value of interface, P is pressed the button2, start to measure.The contact a that module 500 controls S3 is connected with b.P is gradually pressed the button again3(or P4), send module 500 since corresponding minimum (or maximum) level value, no to module 600The digital signal of disconnected incremental (or successively decreasing).The digital signal is converted into correspondingly DC level signal and is sent into mould by module 600Then block 900 from low to high (or from high to low) passs rank to the control input interface input level value of tested communication equipment through K4The DC level signal of variation.The digital signal of corresponding output level is sent to display module 700 and shown in real time by module 500Show, and tested communication equipment is monitored.
When finding that tested communication equipment generates appreciable audiovisual state change, stop pressing P3 (or P4), module 500Digital signal no longer is sent to module 700, while the record of module 500 is this moment to the level value of the digital signal of the transmission of module 700U11(as controlling the control signal threshold value of input interface).
B) automatic control survey mode
The control input interface of tested communication equipment is connect with K4.Press the button P1, selection " automatic control survey controlAfter the 2 " mode of control signal threshold value of input interface, P is pressed the button2, module 500 control S3 contact a connected with b.It presses againLower key P3(or P4), start automatic measurement, module 500 sends from corresponding minimum (or maximum) level value from trend module 600 and opensBegin, the digital signal of constantly incremental (or successively decreasing).The digital signal is constantly converted into correspondingly direct current ordinary mail by module 600Number and be sent into module 900, then through control input interface input level value from K4 to tested communication equipment from low to high (or by heightTo low) pass the DC level signal of rank variation.The digital signal of corresponding output level is sent to display module 700 by module 500Give real-time display, and tested communication equipment is monitored.
When finding that tested communication equipment generates appreciable audiovisual state change, module 500 is no longer sent to module 700Digital signal, while the record of module 500 is this moment to the level value U of the digital signal of the transmission of module 70011(as control input connectsThe control signal threshold value of mouth).
Specifically, the level value for the digital signal that module 500 is exported to module 600 can change within the scope of 0~12V,Or it can change within the scope of 0~5V, the invention is not limited in this regard.
Five, the level value U of the control signal of testing and control output interface output12
Test U12Divide following two situation:
1, the control signal level for being tested communication equipment output interface is condition controlled in tested communication equipment input control letterNumber:
The control output interface of tested communication equipment is connect with K3, the control input interface of communication equipment and K4 are connectedIt connects.Press the button P1, after selecting " level value 1 of the control signal of testing and control output interface output " mode, press the button P2,Start to measure.The contact a that module 500 controls S3 is connected with b.The control signal of tested communication equipment output is successively through K3, module800, module 500 is sent into after S3, module 400, module 500 obtains the level value for the control signal that module 400 is sent, and by the electricityLevel values are sent module 700 to show.P is gradually pressed the button again3(or P4), send module 500 and specified level value to module 600Corresponding digital signal, the level value of this digital signal is with key P3(or P4) every time press and from low to high (or by height toIt is low) variation.In the process, low level value and high value shown by module 700 are obtained, U is denoted as12。
2, the high low state of control signal level value and tested communication equipment input control signal of communication equipment output are testedIt is unrelated:
The control output interface of communication equipment is connect with connector K4.Press the button P1, " testing and control output connects for selectionAfter the 2 " mode of level value of the control signal of mouth output, P is pressed the button2, start to measure.The contact a and b of the control of module 500 S3It connects.The control signal of tested communication equipment output is successively sent into module 500, module after K3, module 800, S3, module 400500 obtain the level value for the control signal that module 400 is sent, and are sent module 700 to show the level value.The tested communication of operationEquipment becomes the level value of the control signal of the control output interface output of tested communication equipment from low to high (or from high to low)Change.In the process, low level value and high value shown by module 700 are obtained, U is denoted as12。
It should be understood that communication device interface parameter test device provided by the above embodiment is in test communication equipmentWhen interface parameters, only the example of the division of the above functional modules, in practical application, can according to need and will be upperIt states function distribution to be completed by different functional modules, i.e., the internal structure of device is divided into different functional modules, to completeAll or part of function described above.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention andWithin principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.