CN2155591Y

CN2155591Y - Automatic tester

Info

Publication number: CN2155591Y
Application number: CN 92245260
Authority: CN
Inventors: 江怡
Original assignee: Sysgration Ltd
Current assignee: Sysgration Ltd
Priority date: 1992-12-19
Filing date: 1992-12-19
Publication date: 1994-02-09
Anticipated expiration: 2002-12-19

Abstract

The utility model discloses an automatic tester, which is composed of a machine table body, a valve, a press machine, a testing table tool, a monitor, a tabulating machine, a keyboard, a disk drive and a computer controlled test system, wherein, the machine table body is hollow; the left and the right sides of the upper part outside the machine table body are respectively provided with a fixing support. The valve is arranged at the left support, the press machine is arranged above the two supports, and the testing table tool is arranged below the two supports. In addition, the right side of machine table body is provided with the monitor and the tabulating machine, and the upper part of the machine table body is provided with the keyboard and the disk drive. The computer controlled test system comprises a computer, a test circuit and a power supply device which are arranged in the machine table body. The test circuit comprises a programmable signal source generator, a large range voltage/current converter and a synchronous detector.

Description

Automatic tester

The utility model relates to a kind of automatic tester, refers to especially a kind ofly be tested by computer control test signal to part composing plate to be measured, sends test result back to computer again, via formula relatively, and reaches the automatic tester of the automatic rapid debugging of part composing plate.

Imformation age, fast changing, on function executing, waste a little time, belonged to not intelligence, the leisure opinion is wasted the too many time in test verification, the part composing plate is after process and assemble is finished, must test via the QC of a succession of strictness again, to eliminate: weak point/open circuit, neglected loading, wrong part, the bad processing procedure problem that waits of element, traditionally this kind QC test mode all by the manpower instrumentation at various element characteristics, tested disaggregatedly, only this method is not only wasted time, more consumes manpower, adds that today is manually expensive, the test of above-mentioned traditional approach not only servicing time long, more must drop into a large amount of manpowers, impel cost to raise up indirectly, not be inconsistent economic benefit in fact.

The purpose of this utility model is promptly at above-mentioned shortcoming, adopt the automatic test mode of computer, produce required test signal to part composing plate to be measured according to different test modules and test status, send test result back to computer again, contrast via the formula design, so that the automatic rapid debugging of production line part composing plate to be provided, can detect processing procedure problems such as weak point/open circuit, neglected loading, wrong part and element after the part plate processing be bad.

A time purpose of the utility model promptly at the automatic rapid debugging of part composing plate, to promote production efficiency, reduces servicing time, manpower and cost.

Automatic tester of the present utility model is made up of board main body, air valve, press, test board tool, monitor, tabulating machine, keyboard, disk drive and computer control test macro etc.; Hollow in the board main body, a left side, outside top, respectively there is a fixed support right both sides, described air valve is positioned on the support, and above between two stands, be a press, the below then is the test board tool, there are monitor and tabulating machine in board main body right side, keyboard and disk drive are housed on the board main body, computer control test macro is by computer, test circuit and power supply unit are formed, be positioned at the board body interior, it is characterized in that this test circuit is by motherboard, tester, derailing switch, I/O bus-bar and platform tool controller are formed, switch and tester are electrically connected by I/O bus-bar and tester and platform tool controller, and the test board tool then 2 is electrically connected with platform tool controller and switch configuration.

In order further to understand the feature and the technology contents of the utility model, please consult following detailed description and accompanying drawing in detail about the utility model, however appended graphic only for reference and explanation usefulness, and be not to be used for the utility model is done any restriction; Relevant accompanying drawing is:

Fig. 1 is the three-dimensional view of the utility model automatic tester;

The computer control test macro calcspar of Fig. 2 the utility model automatic tester;

Fig. 3 is the circuit diagram that the computer of the utility model automatic tester is controlled the programmable signal source generator in the test macro;

Fig. 4 is the circuit diagram that the computer of the utility model automatic tester is controlled big range of voltages/current converter in the test macro;

Fig. 5 is that the computer of the utility model automatic tester is controlled the synchro detection circuit figure in the test macro;

Fig. 6 is the interior composite switch framework circuit diagram of the derailing switch of the utility model automatic tester;

Fig. 7 is the system architecture calcspar of the derailing switch of the utility model automatic tester; And

Fig. 8-Figure 10 is the line architecture circuit diagram of the derailing switch of the utility model automatic tester.

See also the three-dimensional view of the utility model automatic tester shown in the accompanying drawing 1, wherein this automatic tester comprises a board main body 1, hollow in this board main body 1, outside top and arranged on left and right sides respectively has fixed support 11, be mounted with an air valve 5 on the fixed support 11 of a left side, and above between two fixed supports 11, be press 4, the below then is a test board tool 3, and the right side of main body 1 is monitor 6 and tabulation lattice 7.Main body 1 is equipped with a keyboard 8 and disk drive 9 in addition, one computer control test macro 2 is then arranged within the main body 1, when part composing plate T to be tested places on the test board tool 3, when testing, then internal computer control test macro 2 at first transmits a signal to air valve 5, producing air pressure slowly presses down to drive press 4, to make part plate to be measured form all component pins that T goes up are bumps closely contacts with probe 31 on the test board tool 3, then sending the test signal by computer control test macro 2 again tests, and send test result back to computer and the formula setting value compares, treat that all test finishes, press 4 rises, monitor 6 shows that promptly part composing plate T to be measured is non-defective unit or defective products, and is printd out by automatically that all are the bad part of tabulating machine 7.

See also the computer control test macro calcspar of the utility model automatic tester shown in the accompanying drawing 2, the computer control test macro 2 of the utility model mainly is made up of a PC/AT computer 21, test circuit 22 and power supply unit 23, and details are as follows with each module function now:

1.PC/AT computer 21 is the native system master controller, sees through disk drive 9 and deposits the setting formula in, via keyboard 8 operations, dominates whole test procedure, and test result is shown in monitor 6 and printd out by tabulating machine 7.

2. test circuit 22 is made up of a motherboard 221, derailing switch 222, tester 223, I/O bus-bar 224 and platform tool controller 225:

(1) motherboard 221, are mainly the signal that connects associated between derailing switch 222 and the tester 223, and connect power supply unit 23 so that each cell operation power supply to be provided.

(2) derailing switch 222, this derailing switch is between tester 223 and body to be measured (DUT) T, its main work is the measurement signal that tester 223 produces to be connected to survey body T, to record the phase place of voltage and current, and then record its resistance value, and utilize isolation technology, element separation with the other influence test of body T to be measured, make it not influence the accuracy of measurement, so the isolating power of derailing switch 222 with and the mode measured, the effect that influence is measured is quite big, and therefore in the design of this machine, the design focal point of derailing switch 222 has 2 points:

1. the metering system that can use four-wire type is to lower error in measurement.

2. use hybrid-type switch configuration 2228 of analog switch and electromagnetic relay.

(3) tester 223, set control via PC/AT computer 21 formulas, produce required interchange or dc signal according to different test patterns and test status, again via the selection of motherboard 221 and derailing switch 222, probe 31 is correctly delivered to the objective test point of part composing plate to be measured to test on the platform tool 3 after tested, and measure the signal value at element under test two ends, convert digital signals to and send back in the PC/AT computer 21 and compare with setting value.In it and be provided with a programmable signal source generator 2231, this generator 2231 can be with test signal source by former 1KHz that fixes or 10KHz sine wave, be extended to the signal source of 10KHz able to programme～100KHz scope, also can test signal source voltage by original fixing 1V or 0.1V, be extended to 0V able to programme～± the signal source voltage of 1.25V scope; One voltage/power supply changeover device 2232, this conversion 2232 on a large scale can promote circuit and decide electric current to promote the single big range of voltages/current converter of circuit integrated one-tenth with deciding voltage; One synchronous detecting circuit 2233, this detecting circuit 2233 add synchro detection circuit and can make and not only can measure AC impedance aspect ac impedance measurement, more can measure the phasing degree.

(4) the I/O bus-bar 224, are an AT BUS interface card, and PC/AT computer 21 is through controlling the action of each several part unit thus, and obtain the data of measurement thus.

(5) platform tool controller 225 via PC/AT computer 21 control, when testing, is then controlled air valve 5 press 4 is pressed down, and makes that probe 31 closely contacts with part plate T to be measured on the test board tool 3, makes test signal be connected to part plate T to be measured by derailing switch 222; And finish when testing, then control air valve 5 press 4 is risen.

3. power supply unit 23, and through transformation, rectification converts the operating voltage of each system's needs to civil power, and provide each unit to use via motherboard 221.

See also the circuit diagram of the programmable signal generator shown in the accompanying drawing 3, this partial circuit is called programmable signal source generator 2231, and it mainly acts on the sine wave that is to produce a stable output, and use when testing to supply with in square wave or DC reference voltage source.Its function can not only control alternating current-direct current signal voltage able to programme size, and can change output frequency, Y1 in the drawings, U1, R1 composition reference clock pulse wave circuit produces a reference clock pulse wave and is delivered to U2, U2 is a programmable prescaler, can set its divisor to reach the purpose that changes frequency by the computer of outside connection, U3, U4 is that the synchronous ring counter of 10 BIT produces 000 to 1032 ring counting value, this ring counting value is delivered to U7 EPROM to change sine wave or square wave function value, and its functional value is directly transferred to the D/A signal converter (DAC) of U10 and changed out analog sine or square-wave signal.U12 is that an inside has two groups D/A signal converter (DAC) and U13A to be combined into programming ac gain attenuating network, can export the analog sine or the square-wave signal that can change the signal size, and be combined into DC current gain attenuating network able to programme with U11B, can export the DC voltage that can change voltage swing.U13B is that a totalizer acts on direct current and AC signal addition, is the reference voltage source of exportable programmable voltage, frequency, waveform, interchange, direct current or alternating current-direct current mixing therefore.

See also shown in the accompanying drawing 4, this partial circuit is called voltage/current parallel operation 2232 on a large scale, mainly effect is to change the normal voltage of input into normalized current output accurately the vast scope of its scope from number 10mA to number 10nA, perhaps direct outputting standard voltage.Wherein U5A and R1, R2, R3, R4 is combined into differential output amplifier, U1A, its input impedance of U1B voltage follower device is big, can prevent that atomic little electric leakage is to improve the accuracy of current conversion, U3, U4, U2 is the simulation multiplexer, can be by changing control signal Scale0-2 to obtain normal voltage output or different output current gears, output voltage equals input voltage (Vout=Vin) when Scale0-2 is 0 simultaneously, and Scale0-2 is that 100-111 then selects R5, R6, R7, R8, R9, R10, the output current (Iout=Vin/Rref) of R11 measuring resistance (Rref) to produce different gears.And when DrvOut was 0, U4, U3 were cut off, and OUT is a floating, that is no-output voltage or electric current.

See also shown in the accompanying drawing 5, this partial circuit is called synchro detection circuit 2233, and main application is to be used for measure phase difference, herein it is used as detecting AC impedance, and its real part and imaginary part all can be obtained via the calculation formula of exquisiteness.Wherein U5A, U5B, U4 are combined into instrument amplifier, can detect differential signal; R9, R10, R11, R12, R13, R14, R15, R16 and U3 are programmable gain amplifier, computer via control VaProAmp0 VaProAmp1 then switchable gain be 1/3 times, 1 times, 5 times and 10 times; U1a, U1b, S2a, S2b, S2c, S2d, R5, R6, R7, R8 is originally as two groups of positive-negative polarity commutation circuits, U2a, U2b, S1b, S1d, C2, C3 borrows with analog switch S2d is provided, the control pin SINE of S2c, / SINE signal source sync signal and S2a, the control pin COS of S2b, / COS signal source sync signal, can be at U1a, the output terminal of U1b obtains having delivered to respectively the input signal by SINE and COS synchronous cutting, these two signals are delivered to U2a more respectively, the Muller integrator of U2b with integration in addition with its mean direct voltage VxVy, the computer ratio of Vy/Vx is according to this changed out the phase differential in the SINE of going into signal to be measured and signal source via trigonometric function calculation formula.

See also the hybrid-type switch frame composition shown in the accompanying drawing 6, this composite switch device 2228 part in derailing switch 222, adopt cross type analog switch framework and electromagnetic relay to mix the form of using, delivery intends that the ON/OFF speed of switch is fast, little power consumption, the life-span is long, volume is little advantage and the low impedance characteristic of electromagnetic relay.Analog switch is used output and measuring junction at signal, and the principle of utilizing four-wire type to measure has been avoided because analog switch inside and measuring error that line impedance produced make the test speed of measuring signal accuracy and system improve.And because the low impedance characteristic of electromagnetic relay is feasible because the caused measuring error of isolating points impedance lowers greatly at isolating points with its use, has improved isolation effect and increased the scope of testing.

See also the main framework calcspar of the derailing switch shown in the accompanying drawing 7, derailing switch 222 as shown in the figure is provided with:

Working storage 2221 confluxes: main function is with the data state on the motherboard 221, isolates via this working storage, inputs to derailing switch 222 inside, with the misoperation that prevents to be caused because of the bus-bar instability.

Command decoder 2222: be that decoding is done in the instruction of input, and produce the operate as normal that other controlling signal is come gauge tap device 2222.

The conversion of the TTL controlling signal of accurate bit pad 2223: general+5V+/-controlling signal of 8.5V since its operating voltage of derailing switch 2224 analog switches be+/-8.5V, so system's controlling signal of+5V to be changed into+/-signal of 8.5V.

Relay address demoder 2224: will control the signal decoding of electromagnetic relay, to determine the electromagnetic relay action in which block.

Pin address demoder 2225: this demoder will be moved by the analog switch in which block with decision to the signal decoding of control analog switch.

Switch block 2226: eight switch blocks 2226 are arranged on a slice derailing switch 222, eight output points of each block may command, each sheet derailing switch 222 always has 64 output points, all continuous 8 the cross type analog switches of each end points and an electromagnetic relay, via these switches, just output point can be switched to different signal sources arbitrarily.

Signal source switch 2227: this switch is controlled the path that all test signals enter derailing switch 222, the usual off-state that keeps, the test signal switch connection that has only tested pilot just will need when this derailing switch 222 so can reduce because of multiwaferred switch device 222 connects all signal sources altogether and cause load effect.

See also the derailing switch framework circuit diagram of the utility model automatic tester shown in the accompanying drawing 8, as shown in the figure: U1, U2, RP1, RP2 constitute bus-bar working storage 2221, RP1, RP2 are exclusion, it mainly acts on is that the voltage of bus-bar is improved to reduce noise, and the function of U1, U2 is that bus-bar and derailing switch 222 internal circuits are isolated, to avoid when bus-bar has noise, cause the switch misoperation.U3, U8 then constitute command decoder 2222, and the data that test circuit 22 is sent is done to differentiate and decoding, export the regular event of correct controlling signal with gauge tap device 222 again.U4-U7, U9-U11 and R1, R2, C6, RP3-RP6 constitute a voltage quasi position converter 2223.U4-U7 is a comparer, and R1, R2, C6 then produce a comparative voltage position standard, use for comparer; The function of RP3-RP6 is the voltage raising with comparer, so that the reverser of U9-U11 is differentiated.U9-U11 is a reverser, and its effect is that the output signal state with comparer is reversed original signal state again, uses for the rear portion circuit.U12, U13, U14, KA1, KA2, KA3 are for testing the switch of signal, and when test point need be used some signals source, just with specific switch conduction, and other did not need the derailing switch 222 of this signal, and its switch is for disconnecting.So can simplify the effect that influences test because of load effect, U12 then is the transistor array of using when driving electromagnetic relay.

See also the derailing switch framework circuit diagram of the utility model automatic tester shown in the accompanying drawing 9, as shown in the figure: U17 is the address demoder 2224 of electromagnetic relay, when the needs electromagnetic relay moved, U17 can decide the electromagnetic relay of that switch block 2226 to move according to the data of bus-bar and the state of command decoder 2222.U15, U16, RP9, RP10 form the address demoder 2225 of analog switch, RP9, RP10 are the exclusion of 9Pin, its logical pin remains electronegative potential at ordinary times, and U15, U16 are one four pairs 16 demoder, its output pin is a high impedance status at ordinary times, therefore, by exclusion the current potential of output pin is pulled to electronegative potential.When some exit points need move, U15 then, U16 can decide the analog switch in that switch block 2226 to move according to the data of bus-bar and the state of command decoder 2222, then the analog switch of this block is sent signal and require its action, and work as U15, when the output pin of U16 remains high impedance, the common pin current potential of exclusion is become noble potential, then will send signal and require its action all analog switches, because RP9, the common pin of RP10 is indivedual controls, so all analog switches can be moved simultaneously or the analog switch of half action, so can accelerate some testing procedure, raise the efficiency.

See also the derailing switch framework circuit diagram of the utility model automatic tester shown in the accompanying drawing 10; as shown in the figure: U20; U28; U36; U37; U35; D1-D16; K1-K8 forms switch block 2226 altogether; the effect of D1-D18 is to be discharged to 0V as the voltage protection of exit point and pin mark; be set in positive operating voltage at VpDn; this is the voltage protection pattern and VpDp is when bearing operating voltage; when being higher than the operating voltage of setting, input voltage will be absorbed via diode; can do not destroyed with the protection analog switch by too high voltage; and be set in negative operating voltage at VpDn; VpDp is when positive operating voltage; this is discharged to the 0V circuit pattern for pin mark; can with its via diode discharge to 0V; U36; U37; U52; U53 then is 4 * 4 cross type analog switch IC; each IC all can individually move; and one group of per two analog switch IC; common four exit points and 8 signal sources of connecting; again via U15; U16; RP9; the decoding of the relay address demoder 2224 that RP10 formed decides that IC to move, and the selection in end points and signal source and action are then directly decided by the data on the bus-bar.K1-K8 is an electromagnetic relay, and each end points is connected to isolating points 1(G1), utilize the low impedance characteristic of relay that preferable isolating power is provided, U28 is transistor array IC then, is used to provide bigger driving force to drive electromagnetic relay.U20 one has 3 couple, 8 demoders of fastening lock function, and it is subjected to the control of U17, and by the data of confluxing select with which actuating of relay and at relative pin position output signal U28 to drive electromagnetic relay.

In sum, a kind of automatic tester, adopt the automatic test mode of computer, produce required test signals, again through the selection of cross type switch according to different test modules and test status, to test signal and correctly deliver to test point on the part composing plate to be measured, send test result back to computer again, via formula computing contrast, so that the automatic rapid debugging of part composing plate on the production line to be provided, to promote throughput rate, reduce servicing time, manpower and cost.

Claims

1, a kind of automatic tester, it is made up of board main body (1), air valve (5), press (4), test board tool (3), monitor (6), tabulating machine (7), keyboard (8), disk drive (9) and computer control test macro institutes such as (2); Hollow in the board main body, outside top and arranged on left and right sides respectively has a fixed support (11), air valve is positioned on the left socle, and above between two stands, be a press, the below then is the test board tool, and there are monitor and tabulating machine in board main body right side, and keyboard (8) and disk drive (9) are housed on the board main body, computer control test macro (2) is made up of a computer (21), test circuit (22) and power supply unit (23), is positioned at the board body interior; It is characterized in that, this test circuit (22) is made up of a motherboard (221), tester (223), derailing switch (22), I/O bus-bar (224) and platform tool controller (225), derailing switch (222) and tester are carried out electric speed by above-mentioned motherboard and are connect, PC/AT computer 21 is electrically connected by I/O bus-bar (224) and tester (223) and platform tool controller (225), and test board tool (3) then links to each other with platform tool controller (225) and switch configuration.

According to the automatic tester of claim 1, it is characterized in that 2, described tester 223 is made up of programmed signal source (2231), voltage/power supply changeover device (2232) and detecting circuit (2233).

According to the automatic tester of claim 1, it is characterized in that 3, derailing switch (222) also comprises one group of electromagnetic relay.