CN106405243A - Test device and test method for digital fiber-ratio resistor - Google Patents
Test device and test method for digital fiber-ratio resistor Download PDFInfo
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- CN106405243A CN106405243A CN201610982763.XA CN201610982763A CN106405243A CN 106405243 A CN106405243 A CN 106405243A CN 201610982763 A CN201610982763 A CN 201610982763A CN 106405243 A CN106405243 A CN 106405243A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention provides a test device and test method for a digital fiber-ratio resistor. The device comprises a box body, a test box, a sample compression member and a circuit device. The circuit device consists of a discharge switch, a multiplying-power switch, a high-impedance amplifier, a high-precision A/D converter, a power supply module, a touch screen, a micro controller, a full-scale calibration voltage circuit, a discharge switch gear sampling circuit matching the discharge switch, a series voltage-dividing circuit, a power supply selection circuit, a test voltage sampling circuit and a multiplying-power switch gear sampling circuit. The series voltage-dividing circuit, the power supply selection circuit, the test voltage sampling circuit and the multiplying-power switch gear sampling circuit match the multiplying-power switch. The provided device has advantages of simple and compact structure, low costs, good man-machine interaction, high testing precision, convenient and safe usage, and good error prevention performance. The testing method is simple and is easy to implement; the security and reliability are high; and a high-precision testing result is obtained.
Description
Technical field
The present invention relates to fibrous material measuring instrument field and in particular to a kind of digital fiber ratio resistance test device and
Its method of testing.
Background technology
, under External Electrical Field, conductive capability is very low for textile fabric, is a kind of good insulating body, ratio resistance（Resistivity）
General very high, the especially synthetic fibers such as the low terylene of hygroscopicity, acrylic fibers, polyvinyl chloride fibre.It is easy to produce during processing uses
Electrostatic, the ratio resistance value that must control fiber for this is within the specific limits.Fiber ratio resistance tester makes for textile fabric processing
Indispensable with institute of enterprise.Measurement fiber ratio resistance mostly is and simulates fiber type ratio resistance instrument using pointer at present, its major technique shortcoming
It is：1st, resistance measurement scope little it is impossible to meet the test request of the at present increasing conductive fiber ratio resistance of development；2nd, refer to
Pin ammeter instruction resistance value can produce artificial error in reading；3rd, measuring accuracy is poor, and test result reading is unstable；4th, measured result
For resistance value, need to manually be calculated as ratio resistance.Therefore, the survey according to chemical fibre industry production and scientific research inspection body fiber ratio resistance
Examination requires, in the urgent need to a kind of digital fiber ratio resistance tester, to improve the test result degree of accuracy and testing efficiency.Because having
Fibrous insulation resistance high, tester therefore can only be left to wave band with the band switch of high insulaion resistance ceramic material
The gear sampling closed is its difficult point.Application No. 201510822232.X, publication No. are CN105425043A, innovation and creation name
The Chinese patent literature of referred to as " sample automatic conpressed fibers ratio resistance test device and its method of testing " discloses a kind of numeral
Formula fiber ratio resistance test device and its method of testing, it is directed to the test of low resistivity value and using increase low-resistance test switch and surveys
Examination selecting switch method, not only makes test operation complicated, and reduces the insulaion resistance of test circuit, reduce high specific resistance
Value test scope；In tester's error, low resistivity value sample is set to high resistant test to be possible to because of too high voltages or excessive
Electric current leads to instrument damaged；Because sample resistance value is determined by multiplying power two part of meter reading and range switch indication,
The multiplying power how document obtains range switch indication in testing is not disclosed.
Content of the invention
The purpose of the present invention is：For the deficiencies in the prior art, provide that a kind of digital measurement, testing range be wide, test
Efficiency and high, the simple to operate safe and not error-prone digital fiber ratio resistance test device of testing precision and its test side
Method.
The technical scheme is that：The digital fiber ratio resistance test device of the present invention, including casing, testing cassete,
Sample compression element and circuit arrangement；Above-mentioned circuit arrangement includes high-impedance amplifier and high-precision a/d converter；Above-mentioned
Testing cassete is used for accommodating tested fiber samples, and testing cassete plug type is arranged on casing；Testing cassete be provided with first electrode plate and
Second electrode plate；It is structurally characterized in that：Above-mentioned circuit arrangement also includes discharge switch, multiplying power switch, power module, touch
Screen, micro controller, discharge switch gear sample circuit, series connection bleeder circuit, power selection circuit, test voltage sample circuit, times
Rate switch position sample circuit and full scale correction voltage circuit；Wherein：
Discharge switch, expires, discharges or test function for selecting device execution school；Discharge switch respectively with above-mentioned testing cassete
First electrode plate and second electrode plate, high-impedance amplifier, multiplying power switch, discharge switch gear sample circuit, full scale correction electricity
Volt circuit and micro controller electrical connection；
Multiplying power switchs, for the selection of test voltage, range and multiplying power resistance gear, multiplying power switch respectively with above-mentioned electric discharge
Switch, power module, series connection bleeder circuit, power selection circuit, test voltage sample circuit, multiplying power switch position sample circuit
And micro controller electrical connection；
High-impedance amplifier and high-precision a/d converter, send sample detectable voltage signals for detection and to micro controller；High resistant
Anti- amplifier and high-precision a/d converter concatenation, the input of high-impedance amplifier is electrically connected with discharge switch；High-precision A/D
The output end of converter is electrically connected with micro controller；
Power module, for providing test required power supply；Power module out-put supply is controlled by micro controller；
Tested fiber samples are extruded when using for test so that quilt under the control of micro controller by sample compression element
Survey fiber samples to be in close contact with the first electrode plate of above-mentioned testing cassete and second electrode plate；
Touch-screen, for man-machine information interaction, touch-screen is electrically connected with the two-way signaling of micro controller；
Micro controller, for calculating and data storage to plant running Comprehensive Control, ratio resistance value；
Discharge switch gear sample circuit, for micro controller sending signal make micro controller automatic-decision device be in school full,
Electric discharge or test mode；Discharge switch gear sample circuit is electrically connected with discharge switch and micro controller respectively；
Series connection bleeder circuit, for extending the resistance measurement scope of tested fiber, series connection bleeder circuit is electrically connected with multiplying power switch,
During use, series connection bleeder circuit is connected with tested fiber samples partial pressure；
Power selection circuit, for selecting test required voltage；Power selection circuit is switched and power module with multiplying power respectively
Electrical connection；
Test voltage sample circuit, for the current test voltage instantaneous value of automatic detection when using；Test voltage sample circuit divides
Do not electrically connect with power selection circuit and micro controller；
Multiplying power switch position sample circuit, sends range signal for sampling and to micro controller；Multiplying power switch position sample circuit
Electrically connect with multiplying power switch and micro controller respectively；
Full scale correction voltage circuit, for the full required full scale correction voltage signal in offer device school, full scale correction voltage circuit
Input electrically connect with power module；The output end of full scale correction voltage circuit is electrically connected with discharge switch.
Further scheme is：Above-mentioned discharge switch is three knife three position rotary band switch；Discharge switch has to be put
Electric switch knob, discharge switch knob drive under be coaxially synchronized with the movement the first moving contact D21, the second moving contact D22, the 3rd
Moving contact D23 and 3 static contacts J211, J212, J213 being equipped with the first moving contact D21, with the second moving contact D22
3 static contacts J221, J222, J223 being equipped with, with the 3rd moving contact D23 cooperation be provided with 3 static contact J231, J232,
J233；Above-mentioned discharge switch knob is arranged on casing.
Further scheme is：Above-mentioned discharge switch gear sample circuit includes resistance R1～R5 totally 5 resistance；Its
In, one end ground connection of resistance R1, the other end of resistance R1 is electrically connected with one end of resistance R2 by the static contact J231 of discharge switch
Connect；The static contact J232 of the other end of resistance R2, one end of resistance R3 and discharge switch is conllinear；The other end of resistance R3, electricity
The static contact J233 of one end of resistance R4 and discharge switch is conllinear；The other end of resistance R4 has public connecing with one end of resistance R5
Point, the DC3.3V power output end that this common junction is had with micro controller electrically connects；Another termination discharge switch of resistance R5
3rd moving contact D23；The discharge switch gear sampled signal input that 3rd moving contact D23 of discharge switch is arranged with micro controller
Electrical connection.
Further scheme is：Above-mentioned multiplying power switchs as three knife 11 position rotary band switch, and multiplying power switch has
Multiplying power switching knob, the first moving contact D31 being coaxially synchronized with the movement under multiplying power switching knob drives, the second moving contact D32, the
Three moving contact D33；11 static contact J311～J3111 being equipped with the first moving contact D31, are joined with the second moving contact D32
Close 11 static contact J321～J3211 of setting, be provided with 11 static contact J331～J3311 with the 3rd moving contact D33 cooperation；Times
Rate switching knob is arranged on casing；
Above-mentioned multiplying power switch is electrically connected with discharge switch by its first moving contact D31 and the second moving contact D32.
Further scheme is：Above-mentioned series connection bleeder circuit includes resistance R6～R16 totally 11 resistance；Resistance R6～
The electrical connection corresponding with static contact J311～J3111 that multiplying power switchs of each one end of R16；Each other end of resistance R6～R16 all connects
Ground；When test uses, resistance R6～R16 is according to the gear arranging and tested fiber samples（Can be considered resistance）Series connection partial pressure.
Further scheme is：The second moving contact D32 that above-mentioned above-mentioned power selection circuit is switched by multiplying power and with
11 static contact J321～J3211 of its cooperation and the wire connecting are constituted；Wherein, static contact J321, static contact J322
And static contact J323 connected by conductor in parallel after form a common junction, this common junction is the of power selection circuit
One power input；Static contact J324～J3211 forms a common junction after totally 8 static contacts are connected by conductor in parallel,
This common junction is the second source input of power selection circuit；Power selection circuit is by its first and second power input
Electrically connect with power module.
Further scheme is：Above-mentioned multiplying power switch position sample circuit includes resistance R17～R29 totally 13 resistance；
Wherein, one end ground connection of resistance R17, static contact J331 and one end of resistance R18 that the other end of resistance R17 switchs by multiplying power
Concatenation；Resistance R18～R28 is sequentially connected in series；Static contact J332～the J3311 every with resistance R18～R28 2 successively of multiplying power switch
The corresponding electrical connection of the concatenation point of adjacent resistor；The other end not concatenated of resistance R28 has public connecing with one end of resistance R29
Point, this common junction connects the DC3.3V power output end that micro controller has；The other end of resistance R29 moves with the 3rd of multiplying power switch
Contact D33 electrically connects；The multiplying power switch position sampled signal input that 3rd moving contact D33 of multiplying power switch is provided with micro controller
Electrical connection.
Further scheme is：Above-mentioned sample compression element is electric pushrod or air-leg.
A kind of above-mentioned digital fiber ratio resistance test device is used for testing the method for testing of fiber ratio resistance, including with
Lower step：
1. device school zero：Engaging means power supply preheats, and inputs fiber samples type to be measured by touch-screen, and preheating terminates rear basis
Discharge switch is placed in electric discharge gear by the prompting of touch-screen；Discharge switch gear sample circuit automatically detects discharge switch and puts
After electric discharge gear, now high-impedance amplifier input end grounding；Micro controller is through high-impedance amplifier and high-precision a/d converter
Gather and save set is because of the null offset magnitude of voltage Vo of outside induced voltage and the generation of device circuit Parameters variation reason；
2. device school is full：School is full to point out storing electric switch to the full gear in school to carry out according to touch-screen, and rear micro controller meter is completely terminated in school
Calculate and preserve ideal voltage value Vf and school full voltage correction value Vi；Point out to put electric switch to the gear that discharges according to touch-screen；
3. fiber samples corresponding multiplying power gear and test voltage are selected：According to fiber samples to be measured, determine its corresponding multiplying power
Gear；Multiplying power switch is placed in the multiplying power gear of setting；Required test voltage is synchronously chosen；
4. fiber samples test：Fiber samples to be measured are put in testing cassete and testing cassete is in place；By touch-screen to micro-control
System sends compression sample order, and sample compression element conpressed fibers sample is to setting position；Storing is pointed out to establish by cable according to touch-screen
Close to test gear；Micro controller automatically begins to countdown in 60 seconds；Power module adds default test voltage to testing cassete；High resistant
Anti- amplifier 4 detects that multiplying power switchs test signal voltage value Vm of formation on connect multiplying power resistance, amplified by high-precision A/D
Converter 5 is converted into data signal and sends micro controller；Test signal voltage value Vm transmission touch-screen is shown by micro controller；Micro controller
Gather the gear number of now multiplying power switch by multiplying power switch position sample circuit simultaneously, determine the corresponding multiplying power resistance prestoring
Value Rm；Determine current test voltage gear simultaneously；It is real-time that micro controller obtains test voltage by test voltage sample circuit simultaneously
Detected value Vt；
5. calculate the resistance value of tested fiber samples：Micro controller utilizes the null offset magnitude of voltage Vo of gained, reason in abovementioned steps
Think magnitude of voltage Vf, school full voltage correction value Vi and test signal voltage value Vm and detected by test voltage sample circuit
Real-time voltage value Vt, calculates resistance value Rx of tested fiber samples；
6. calculate the ratio resistance value of tested fiber samples：Micro controller according to the parameter of tested fiber samples of input and calculates
Tested fiber samples resistance value Rx, the ratio resistance value of this sample is calculated according to the general formula that ratio resistance calculates, concurrently
Touch-screen is sent to show in real time；Micro controller preserves resistance value Rx of tested fiber samples and the ratio resistance value of this detection；
7. take off testing cassete：Discharge switch is put by electric gear according to touch-screen prompting；Discharge switch gear sample circuit is automatic
Detect discharge switch have been placed in discharge gear after, micro controller Control Assay compression element is disengaged with testing cassete, takes off survey
Examination box, takes out this tested fiber samples；
8. 4. to step 7., the lower portion fiber samples of test, until finish the required test sample number of times of test for repeat step.
Further scheme is：2. the full method in middle device school comprises the following steps above-mentioned step：
The first step, calculates ideal voltage value Vf：Micro controller adopts formula（1）Calculate ideal voltage value Vf:
Vf=Rs × Vt/ (Rm-Rs)（1）
In formula, Vt is the test voltage value that when school is full, micro controller receives the actual measurement that test voltage sample circuit sends, and Rs, Rm are micro-
For the resistance value of full scale when what control device was preset can make test device school full, wherein Rs can be considered sample resistance value, and Rm can be considered
Multiplying power resistance value；
Second step, calculates and preserves school full voltage correction value：Micro controller adopts formula（2）Calculate and preserve school full voltage correction value
Vi：
Vi=Vf- (Va-Vo)（2）
In formula, Va is the voltage actual measurement of the multiplying power resistance Rm that micro controller obtains through high-impedance amplifier and high-precision a/d converter
Value, Vo is the null offset magnitude of voltage of step 1. middle gained, and Vf is the ideal voltage value of first step gained in this step；
Above-mentioned step 4. in, micro controller is adopted to test signal voltage value Vm and is selected with the following method：
If test signal voltage value Vm that touch-screen shows is basicly stable constant, touch-screen prompting confirms that currency is test
Value；If test signal voltage value Vm is drifted about in time, microcontroller automatically by 60s the countdown concluded when test signal voltage value
Vm is as the measured value confirming；
Above-mentioned step 5. in, the method for resistance value that micro controller calculates tested fiber samples comprises the following steps：
The first step, first adopts formula（3）Calculate correction value Vmc of test signal voltage value Vm：
Vmc=(Vm-Vo) × Vi/Vf（3）
In formula, Vo is the null offset magnitude of voltage of step 1. middle gained, and Vm is the test signal voltage value of step 4. middle gained, Vi
School full voltage correction value for step 2. middle gained；Vf is the ideal voltage value of step 2. middle gained；
Second step：Adopt formula again（4）Calculate resistance value Rx of tested fiber samples：
Rx=Vmc × Rm/ (Vt-Vmc)（4）
In formula, Vt is the real-time voltage value currently being detected by test voltage sample circuit, and Rm is current multiplying power resistance value.
The present invention has positive effect：（1）The digital fiber ratio resistance test device of the present invention, structure is simply tight
Gather, cost is relatively low, only need to during use to complete test operation by two knobs and touch-screen, man-machine interaction is good,
It is used conveniently and safely, not error-prone.（2）The digital fiber ratio resistance test device of the present invention, it, can be automatic when using
Real-time monitoring is carried out to the state of test power supply, discharge switch, multiplying power switch, there is fault-tolerant defencive function, security reliability is good.
（3）The digital fiber ratio resistance test device of the present invention, its test use when, to the null offset magnitude of voltage of device, school
Full voltage correction value etc. is all paid attention to and is automatically changed such that it is able to effectively improve the measuring accuracy of device.（4）This
Bright digital fiber ratio resistance test device, it is provided with Ethernet interface, USB port, serial ports, and being easy to networking, grafting USB flash disk etc. makes
With having expanded the cost performance of device.（5）Digital fiber ratio resistance test device using the present invention carries out fiber samples test
Method, simple and easy to do, safe and reliable and be obtained in that high-precision test result.
Brief description
Fig. 1 is a kind of structural representation of assembly of the invention；
Fig. 2 is the circuit structure schematic block diagram of assembly of the invention；
Fig. 3 is the structural representation of first group of dynamic and static contact of discharge switch in Fig. 2, and in figure also schematically illustrates its part
Electrical connection；
Fig. 4 is the structural representation of second group of dynamic and static contact of discharge switch in Fig. 2, and in figure also schematically illustrates its part
Electrical connection；
Fig. 5 is the structural representation of the 3rd group of dynamic and static contact of discharge switch in Fig. 2, and in figure also schematically illustrates itself and Fig. 2
The electrical connection of middle discharge switch gear sample circuit；
The structural representation of first group of dynamic and static contact that Fig. 6 switchs for Fig. 2 moderate multiplying factor, in figure also schematically illustrates itself and Fig. 2
The electrical connection of middle series connection bleeder circuit；
The structural representation of second group of dynamic and static contact that Fig. 7 switchs for Fig. 2 moderate multiplying factor；
The structural representation of the 3rd group of dynamic and static contact that Fig. 8 switchs for Fig. 2 moderate multiplying factor, in figure also schematically shows its with
The electrical connection of Fig. 2 moderate multiplying factor switch position sample circuit.
Reference in above-mentioned accompanying drawing is as follows：
Casing 100,
Testing cassete 1,
Discharge switch 2, discharge switch knob 2-1, discharge switch gear sample circuit 21,
Multiplying power switchs 3, multiplying power switching knob 3-1, bleeder circuit 31 of connecting, test voltage sample circuit 32, multiplying power switch position
Sample circuit 33；
High-impedance amplifier 4, high-precision a/d converter 5,
Power module 6, power switch 6-1, full scale correction voltage circuit 61,
Sample compression element 7,
Touch-screen 8,
Micro controller 9, too network interface 91, USB port 92, serial ports 93.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
（Embodiment 1）
See Fig. 1 and Fig. 2, the digital fiber ratio resistance test device of the present embodiment, it is mainly by casing 100, testing cassete 1, examination
Sample compression element 7 and circuit arrangement composition.Circuit arrangement includes discharge switch 2, multiplying power switchs 3, high-impedance amplifier 4, high-precision
Degree A/D converter 5, power module 6, touch-screen 8, micro controller 9, discharge switch gear sample circuit 21, series connection bleeder circuit 31,
Power selection circuit, test voltage sample circuit 32, multiplying power switch position sample circuit 33 and 61 groups of full scale correction voltage circuit
Become.
Micro controller 9, for calculating and data storage to plant running Comprehensive Control, ratio resistance value, micro controller 9 is provided with puts
Electric switch gear sampled signal input, sample detection signal input, the first and second test voltage sampled signal inputs,
Multiplying power switch position sampled signal input, the first and second power supply output control terminals, the output of sample compression element control signal
End, contact screen information interaction end and DC3.3V power output end；Micro controller 9 is also equipped with the Ethernet on casing 100
Mouth 91, USB port 92 and serial ports 93.In the present embodiment, micro controller 9 preferably employs technical grade MCU.
Power module 6 is used for providing test required power supply；Power module 6 is by 1V voltage-stabilized power supply and 100V voltage-stabilized power supply group
Become, power module 6 is provided with power input, first, second power output end and the input of first, second power supply output control signal
End；First, second power supply output control signal input of power module 6 exports control with the first and second power supplys of micro controller 9
The corresponding electrical connection in end processed；During use, the power input of power module 6 is by being disposed in outside the power switch 6-1 on casing 100
Connect 220V civil power, the first power output end output DC1V power supply of power module 6, the second source output end of power module 6 is defeated
Go out DC100V power supply；Power module 6 out-put supply is controlled by micro controller 9；Had during power module 6 output 100V voltage-stabilized power supply
Current protecting function.
Full scale correction voltage circuit 61 is used for providing school full required full scale correction voltage signal, full scale correction voltage circuit
61 input and the second source output end of power module 6（100V）Electrical connection.
Testing cassete 1 plug type is arranged on casing 100；Testing cassete 1 is provided with first electrode plate and second electrode plate, and first
Spacing between battery lead plate and second electrode plate is fixed.During use, testing cassete 1 accommodates tested fiber samples, tested fiber samples
Extruded by sample compression element 7, with testing cassete 1 in first electrode plate and second electrode plate be in close contact.
Referring to Fig. 3 to Fig. 5, discharge switch 2 is three knife three position rotary band switch, and discharge switch 2 has discharge switch
Knob 2-1, discharge switch knob 2-1 drive under be coaxially synchronized with the movement the first moving contact D21, the second moving contact D22, the 3rd
Moving contact D23, is provided with 3 static contacts J211, J212, J213 with the first moving contact D21 cooperation, is coordinated with the second moving contact D22
It is provided with 3 static contacts J221, J222, J223, be provided with 3 static contacts J231, J232, J233 with the 3rd moving contact D23 cooperation；Put
Electric switch knob 2-1 is arranged on casing 100.
First moving contact D21 of discharge switch 2 is electrically connected with the first electrode plate of testing cassete 1；Static contact J211 and full scale
The output end electrical connection of correction voltage circuit 61；Static contact J212 is grounded；Second moving contact D22 of discharge switch 2 and testing cassete 1
Second electrode plate electrical connection；Static contact J221 is vacant；Static contact J222 is grounded；
Discharge switch gear sample circuit 21, for making micro controller 9 automatic-decision device be in school to micro controller 9 sending signal
Completely, electric discharge or test mode；Discharge switch gear sample circuit 21 and the supporting setting of discharge switch 2, discharge switch gear is sampled
By resistance R1～R5, totally 5 resistance form circuit 21；Wherein, one end ground connection of resistance R1, the other end of resistance R1 passes through stationary contact
Head J231 is electrically connected with one end of resistance R2；The other end of resistance R2, one end of resistance R3 and static contact J232 are conllinear；Resistance
The other end of R3, one end of resistance R4 and static contact J233 are conllinear；The other end of resistance R4 has public affairs with one end of resistance R5
Contact altogether, this common junction connects the DC3.3V power output end of micro controller 9；The 3rd of another termination discharge switch 2 of resistance R5
Moving contact D23；The discharge switch gear sampled signal input that 3rd moving contact D23 of discharge switch 2 connects micro controller 9 is electrically connected
Connect.
Discharge switch 2 is used for device for selection controlling execution school expires, discharges or test function；Discharge switch 2 third gear function is by 1
Setting gradually to 3 grades expires for school, discharges and tests；And discharge switch knob 2-1 periphery setting respective identification, use on casing
When, when discharge switch knob 2-1 is placed in the full shelves in school, the first moving contact D21 and static contact J211 connects, the second moving contact D22
Connect with static contact J221, the 3rd moving contact D23 and static contact J231 connects；When discharge switch knob 2-1 is placed in electric discharge shelves,
First moving contact D21 and static contact J212 connect, and the second moving contact D22 and static contact J222 connects, the 3rd moving contact D23 with quiet
Contact J232 connects；When discharge switch knob 2-1 is placed in test shelves, the first moving contact D21 and static contact J213 connects, and second
Moving contact D22 and static contact J223 connects, and the 3rd moving contact D23 and static contact J233 connects.
High-impedance amplifier 4 and high-precision a/d converter 5 concatenate, and send sample detection electricity for detection and to micro controller 9
Pressure signal；High-impedance amplifier 4 and high-precision a/d converter 5 are ripe prior art, no longer describe in detail.High impedance amplifies
The input of device 4 is electrically connected with the first moving contact D21 of discharge switch 2；The output end of high-precision a/d converter 5 and micro controller 9
Sample detection signal input electrical connection.
Referring to Fig. 6 to Fig. 8, multiplying power switch 3, for the selection of test voltage, range and multiplying power resistance gear；Multiplying power is opened
Closing 3 is three knife 11 position rotary band switch, and multiplying power switch 3 has multiplying power switching knob 3-1, in multiplying power switching knob 3-1
The first moving contact D31 of being coaxially synchronized with the movement under driving, the second moving contact D32, the 3rd moving contact D33, with the first moving contact D31
Cooperation is provided with 11 static contact J311～J3111, is provided with 11 static contact J321～J3211 with the second moving contact D32 cooperation, with
3rd moving contact D33 cooperation is provided with 11 static contact J331～J3311；Multiplying power switching knob 3-1 is arranged on casing 100.
First moving contact D31 of multiplying power switch 3 is electrically connected with the static contact J213 of discharge switch 2；The second of multiplying power switch 3
Moving contact D32 is electrically connected with the static contact J223 of discharge switch 2.
Referring to Fig. 6, bleeder circuit 31 of connecting, for extending the resistance measurement scope of tested fiber, bleeder circuit 31 of connecting
It is main that by resistance R6～R16, totally 11 multiplying power resistance form；Each one end of resistance R6～R16 switchs 3 static contact with multiplying power
The corresponding electrical connection of J311～J3111；Each other end of resistance R6～R16 is all grounded；During test, multiplying power resistance R6～R16 is according to setting
The gear put and tested fiber samples（Can be considered resistance）Series connection partial pressure.
Referring to Fig. 7, power selection circuit, for selecting test required voltage；Power selection circuit is by the of multiplying power switch 3
The two moving contact D32 and 11 static contact J321～J3211 being coordinated with it and the wire being connected are constituted；Wherein, static contact
J321, static contact J322 and static contact J323 form a common junction after connecting by conductor in parallel, and this common junction is
The first power input for power selection circuit；First power input of power selection circuit and the first of power module 6
Power output end（DC1V）Electrical connection；Static contact J324～J3211 forms one after totally 8 static contacts are connected by conductor in parallel
Common junction, this common junction is the second source input of power selection circuit；The second source of power selection circuit is defeated
Enter the second source output end at end and power module 6（DC100V）Electrical connection；During use, when the second moving contact D32 with quiet
When in contact J321～J323, any one connects, device selects the power supply of DC1V test；When the second moving contact D32 and static contact
When in J324～J3211, any one connects, device selects the power supply of DC100V test.
Test voltage sample circuit 32, for the current test voltage instantaneous value of automatic detection when using；Test voltage is sampled
Circuit 33 is provided with first, second signal input part and first, second signal output part, test voltage sample circuit 33 first,
The electrical connection corresponding with first, second power input of aforesaid power selection circuit of secondary signal input；Test voltage is adopted
First, second signal output part of sample circuit 33 electricity corresponding with first, second test voltage sampled signal input of micro controller 9
Connect.
Referring to Fig. 8, multiplying power switch position sample circuit 33, send range signal for sampling and to micro controller 9；Multiplying power is opened
Close gear sample circuit 33 and switch 3 supporting settings with multiplying power, multiplying power switch position sample circuit 33 is by resistance R17～R29 totally 13
Resistance composition；Wherein, one end ground connection of resistance R17, the other end of resistance R17 passes through the one of static contact J331 and resistance R18
End concatenation；Resistance R18～R28 is sequentially connected in series；Static contact J332～J3311 2 adjacent resistors every with resistance R18～R28 successively
The corresponding electrical connection of concatenation point, for example, static contact J332 is electrically connected with the point that concatenates of resistance R18 and resistance R19；Static contact
J3311 concatenates point electrical connection with resistance R27's and resistance R28, and the rest may be inferred；The other end not concatenated of resistance R28 and resistance
One end of R29 has common junction, and this common junction connects the DC3.3V power output end of micro controller 9；The other end of resistance R29 with
3rd moving contact D33 electrical connection of multiplying power switch 3；3rd moving contact D33 of multiplying power switch 3 switchs shelves with the multiplying power of micro controller 9
Position sampled signal input electrical connection.In the present embodiment, the resistance value of resistance R17～R27 is 100 Ω, the resistance value of resistance R28
For 560 Ω, the resistance value of R29 is 20k Ω.The effect of resistance R17 is to allow the voltage of the first gear and ground voltage to distinguish, resistance
The effect of R28 is to allow the voltage of last gear and+3.3V to distinguish, and the effect of resistance R29 is so that multiplying power switch 3 in rotation
Voltage when being not yet connected with gear stationary contact during turning is about+3.3V.
Multiplying power switch 3 is by its multiplying power switching knob 3-1 driving on casing 100 so that the first of multiplying power switch 3 moves
The static contact of 11 gears that contact D31, the second moving contact D32, the 3rd moving contact D33 are synchronously each arranged with it respectively connects
Touch；Multiplying power switching knob 3-1 is labeled with 11 gears on casing 100, this corresponding resistance range of 11 gears be 10 Ω～
103Ω、103Ω～105Ω、105Ω～107Ω、106Ω～107Ω、107Ω～108Ω、108Ω～109Ω、109Ω～1010
Ω、1010Ω～1011Ω、1011Ω～1012Ω、1012Ω～1013Ω、1013Ω～1014Ω, during use, when multiplying power switchs rotation
When button 3-1 is placed in first, second, and third gear, the multiplying power resistance value of selection is 102Ω、104Ω and 106Ω, now selectes
Test voltage value is 1V, when multiplying power switching knob 3-1 be placed in the 4th to 11 gear when, the multiplying power resistance value of selection is 104
Ω～1011Ω, the test voltage value now selected is 100V；The multiplying power switching knob 3-1 of multiplying power switch 3 rotates counterclockwise to not
Can revolve, now each movable contact of multiplying power switch 3 connects the first gear stationary contact arranging with it respectively, and micro controller 9 will sample
The voltage of about 0.2V, multiplying power switch 3 often turns clockwise a gear, and micro controller 9 will sample the voltage raising about 0.2V, micro-control
Device 9 determines the gear of multiplying power switch 3 with this.
Still see Fig. 2, sample compression element 7 is used for the tested fiber samples inserted in testing cassete 1 are compressed so that quilt
Survey the first electrode plate in fiber samples and testing cassete 1 and second electrode plate is in close contact.Sample compression element 7 can adopt electronic
Push rod, may also be employed air-leg, preferably employs electric pushrod in the present embodiment.Sample compression element 7 is provided with and micro controller 9 phase
The control signal input connecting, the action of sample compression element 7 is controlled by micro controller 9；The control signal of sample compression element 7
Input is electrically connected with the sample compression element control signal output end of micro controller 9.
Touch-screen 8 such as is used for parameter input, operates selection, test and warning message to show at man-machine information interaction, the touch-screen 8
Electrically connect with the information exchange end two-way signaling of micro controller 9.
Referring to Fig. 1～8, the digital fiber ratio resistance test device of the present embodiment, it is used for testing fiber ratio resistance
Method, comprises the following steps：
1. device school zero：Engaging means power supply preheats, and inputs fiber samples type to be measured by touch-screen 8, and preheating terminates rear root
According to the prompting of touch-screen 8, discharge switch 2 is placed in electric discharge gear by rotating electric-discharging switching knob 2-1；Device passes through discharge switch shelves
Position sample circuit 21 automatically detect discharge switch 2 have been placed in discharge gear after, now high-impedance amplifier 4 input end grounding,
I.e. connecting to neutral current potential；Through high-impedance amplifier 4 and high-precision a/d converter 5 collection and save set is because of outside induced electricity for micro controller 9
Pressure and the null offset magnitude of voltage Vo of device circuit Parameters variation reason generation；
2. device school is full：Touch-screen 8 prompting puts electric switch 2 to the full gear in school, and rotating electric-discharging switching knob 2-1 is by discharge switch
2 are placed in the full gear in school；Device automatically detects after discharge switch 2 put the full gear in school, and it is full that device carries out school, after school is completely terminated,
Touch-screen 8 points out for discharge switch 2 to put electric gear；Discharge switch 2 is placed in electric discharge gear by rotating electric-discharging switching knob 2-1；
In this step, the full method in school adopts following steps：
The first step, calculates ideal voltage value Vf：Micro controller 9 adopts formula（1）Calculate ideal voltage value Vf:
Vf=Rs × Vt/ (Rm-Rs)（1）
In formula, Vt is the test voltage value that when school is full, micro controller 9 receives the actual measurement that test voltage sample circuit 32 sends, Rs, Rm
For micro controller 9 preset when test device school can be made full for the resistance value of full scale, wherein Rs can be considered sample resistance value, and Rm can
It is considered as multiplying power resistance value；Ideal voltage value Vf is magnitude of voltage when not considering various impact suffered by device.
Second step, calculates and preserves school full voltage correction value：Micro controller 9 adopts formula（2）Calculate and preserve school full voltage
Correction value Vi：
Vi=Vf- (Va-Vo)（2）
In formula, Va is that the voltage of the multiplying power resistance Rm that micro controller 9 obtains through high-impedance amplifier 4 and high-precision a/d converter 5 is real
Measured value, Vo is the null offset magnitude of voltage of step 1. middle gained, and Vf is the ideal voltage value of first step gained in aforementioned step；
3. fiber samples corresponding multiplying power gear and test voltage are selected：According to fiber samples to be measured, determine its corresponding multiplying power
Gear, rotation multiplying power switching knob 3-1 is to the multiplying power gear setting；Select multiplying power gear by rotating multiplying power switching knob 3-1
While, select the corresponding test voltage of this gear；
4. fiber samples test：By fiber samples to be measured（15g staple fibre）Put in testing cassete 1 and will be in place for testing cassete 1；
Compression sample order is sent to microcontroller 9 by touch-screen 8, sample compression element 7 conpressed fibers sample is to setting position；Touch
Screen 8 prompting puts electric switch 2 to test gear, and discharge switch 2 is placed in test gear by rotating electric-discharging switching knob 2-1；Device
Automatically detect after discharge switch 2 has put test gear and automatically begin to countdown in 60 seconds, it is pre- that power module 6 adds to testing cassete 1
If test voltage, 3 to ground is switched through discharge switch 2, multiplying power by the electric current of the fiber samples overwhelming majority, and in multiplying power switch
Test signal voltage value Vm is formed on the multiplying power resistance that 3 are connect, high-impedance amplifier 4 amplifies this voltage and turns through high-precision A/D
Parallel operation 5 sends micro controller 9 after being converted into data signal；Touch-screen 8 receives test signal voltage value Vm the reality that micro controller 9 sends
When display, if test signal voltage value Vm is basicly stable constant, touch-screen 8 prompting confirm currency be test value；If test
Signal voltage value Vm drifts about in time, microcontroller 9 automatically using 60s the countdown concluded when test signal voltage value Vm as true
The measured value recognized；Micro controller 9 gathers the gear number of now multiplying power switch 3 by multiplying power switch position sample circuit 33 simultaneously, really
Fixed corresponding multiplying power resistance value Rm simultaneously determines that current test voltage gear is 1V or 100V simultaneously；Resistance value Rm is resistance R16-
R16 measures gained through precision resister instrument and is stored in the resistance value in micro controller 9；Micro controller 9 is adopted by test voltage simultaneously
Sample circuit 32 obtains test voltage real-time detection value Vt；
5. calculate the resistance value of tested fiber samples：Micro controller 9 first adopts formula（3）Calculate the correction of test signal voltage value Vm
Value Vmc, then adopt formula（4）Calculate resistance value Rx of tested fiber samples：
Vmc=(Vm-Vo) × Vi/Vf（3）
In formula, Vo is the null offset magnitude of voltage of step 1. middle gained, and Vm is the test signal voltage value of step 4. middle gained, Vi
School full voltage correction value for step 2. middle gained；Vf is the ideal voltage value of step 2. middle gained；
Rx=Vmc × Rm/ (Vt-Vmc)（4）
In formula, Vt is the real-time voltage value currently passing through test voltage sample circuit 32 detection, and Rm is current multiplying power resistance value；
6. calculate the ratio resistance value of tested fiber samples：Micro controller 9 according to the parameter of tested fiber samples of input and calculates
Tested fiber samples resistance value Rx, the ratio resistance value of this sample is calculated according to the general formula that ratio resistance calculates, concurrently
Touch-screen 8 is sent to show in real time；Micro controller 9 preserves resistance value Rx of tested fiber samples and the ratio resistance value of this detection；
7. take off testing cassete：Touch-screen 8 points out for discharge switch 2 to put electric gear, and electric discharge is opened by rotating electric-discharging switching knob 2-1
Close 2 and be placed in electric discharge gear；Device automatically detects discharge switch 2 by discharge switch gear sample circuit 21 and has been placed in the shelves that discharge
Behind position, micro controller 9 Control Assay compression element 7 is disengaged with testing cassete 1, takes off testing cassete 1, takes out this tested fiber examination
Sample；
8. 4. to step 7., the lower portion 15g fiber samples of test, until finish the required test sample of test for repeat step
Number；Device calculates preservation test result and its statistical value automatically；Instrument automatically calculates and its statistical value rounding off method follow up-to-date
The fiber ratio resistance method of testing standard announced.
In test process involved by abovementioned steps, micro controller 9 is passed through added by test voltage sample circuit 32 real-time detection
Test voltage, once incorrect magnitude of voltage is detected, for example make a fault by low-resistance value sample elect as 100V test electricity
During pressure test, micro controller 9 controls power module 6 cut-out immediately, and this tests power supply, stops testing and passing through touch-screen 8 to tester
Member gives a warning information.
Simulate during fiber type ratio resistance instrument produces in order that multiplying power resistance reaches specified resistance value generally using several in pointer
Individual resistance is realized by series-parallel system, and the stability of resistance value is poor, and in the present embodiment, micro controller 9 preserves multiplying power switch 3 use
In the exact value of all multiplying power resistance R6～R16 of expansion fiber resistance measurement scope, improve the precision and accurately of measured value
Degree, the also production of convenient instrument.
In the present embodiment, whether device can put electric gear by automatic detection discharge switch 2, put in discharge switch 2
During electric gear, the fiber samples in testing cassete 1 could be compressed or discharge operation, in case fiber samples are compressed or release
Put generation electrostatic in operating process, harmful effect is produced to device.
Above example is the explanation of the specific embodiment to the present invention, rather than limitation of the present invention, relevant technology
The technical staff in field without departing from the spirit and scope of the present invention, can also make various conversion and change and obtain
To corresponding equivalent technical scheme, therefore all equivalent technical schemes all should be included into the patent protection model of the present invention
Enclose.
Claims (10)
1. a kind of digital fiber ratio resistance test device, including casing, testing cassete, sample compression element and circuit arrangement；Institute
The circuit arrangement stated includes high-impedance amplifier and high-precision a/d converter；Described testing cassete is used for accommodating tested fiber examination
Sample, testing cassete plug type is arranged on casing；Testing cassete is provided with first electrode plate and second electrode plate；It is characterized in that：Institute
The circuit arrangement stated also includes discharge switch, multiplying power switch, power module, touch-screen, micro controller, discharge switch gear sampling electricity
Road, series connection bleeder circuit, power selection circuit, test voltage sample circuit, multiplying power switch position sample circuit and full scale school
Positive electricity volt circuit；Wherein：
Discharge switch, expires, discharges or test function for selecting device execution school；Discharge switch respectively with described testing cassete
First electrode plate and second electrode plate, high-impedance amplifier, multiplying power switch, discharge switch gear sample circuit, full scale correction electricity
Volt circuit and micro controller electrical connection；
Multiplying power switchs, for the selection of test voltage, range and multiplying power resistance gear, multiplying power switch respectively with described electric discharge
Switch, power module, series connection bleeder circuit, power selection circuit, test voltage sample circuit, multiplying power switch position sample circuit
And micro controller electrical connection；
High-impedance amplifier and high-precision a/d converter, send sample detectable voltage signals for detection and to micro controller；High resistant
Anti- amplifier and high-precision a/d converter concatenation, the input of high-impedance amplifier is electrically connected with discharge switch；High-precision A/D
The output end of converter is electrically connected with micro controller；
Power module, for providing test required power supply；Power module out-put supply is controlled by micro controller；
Tested fiber samples are extruded when using for test so that quilt under the control of micro controller by sample compression element
Survey fiber samples to be in close contact with the first electrode plate of described testing cassete and second electrode plate；
Touch-screen, for man-machine information interaction, touch-screen is electrically connected with the two-way signaling of micro controller；
Micro controller, for calculating and data storage to plant running Comprehensive Control, ratio resistance value；
Discharge switch gear sample circuit, for micro controller sending signal make micro controller automatic-decision device be in school full,
Electric discharge or test mode；Discharge switch gear sample circuit is electrically connected with discharge switch and micro controller respectively；
Series connection bleeder circuit, for extending the resistance measurement scope of tested fiber, series connection bleeder circuit is electrically connected with multiplying power switch,
During use, series connection bleeder circuit is connected with tested fiber samples partial pressure；
Power selection circuit, for selecting test required voltage；Power selection circuit is switched and power module with multiplying power respectively
Electrical connection；
Test voltage sample circuit, for the current test voltage instantaneous value of automatic detection when using；Test voltage sample circuit divides
Do not electrically connect with power selection circuit and micro controller；
Multiplying power switch position sample circuit, sends range signal for sampling and to micro controller；Multiplying power switch position sample circuit
Electrically connect with multiplying power switch and micro controller respectively；
Full scale correction voltage circuit, for the full required full scale correction voltage signal in offer device school, full scale correction voltage circuit
Input electrically connect with power module；The output end of full scale correction voltage circuit is electrically connected with discharge switch.
2. digital fiber ratio resistance test device according to claim 1 it is characterised in that：Described discharge switch is
Three knife three position rotary band switch；Discharge switch have discharge switch knob, discharge switch knob drive under coaxial synchronous
Motion the first moving contact D21, the second moving contact D22, the 3rd moving contact D23 and be equipped with the first moving contact D21 3
Individual static contact J211, J212, J213,3 static contacts J221, J222, J223 being equipped with the second moving contact D22, with
Three moving contact D23 cooperations are provided with 3 static contacts J231, J232, J233；Described discharge switch knob is arranged on casing.
3. digital fiber ratio resistance test device according to claim 2 it is characterised in that：Described discharge switch shelves
Position sample circuit includes resistance R1～R5 totally 5 resistance；Wherein, one end ground connection of resistance R1, the other end of resistance R1 passes through to put
The static contact J231 of electric switch is electrically connected with one end of resistance R2；The other end of resistance R2, one end of resistance R3 and electric discharge are opened
The static contact J232 closing is conllinear；The static contact J233 of the other end of resistance R3, one end of resistance R4 and discharge switch is conllinear；Electricity
The other end of resistance R4 and one end of resistance R5 have common junction, the DC3.3V power supply output that this common junction and micro controller have
End electrical connection；3rd moving contact D23 of another termination discharge switch of resistance R5；3rd moving contact D23 of discharge switch with micro-
The discharge switch gear sampled signal input electrical connection of control device setting.
4. digital fiber ratio resistance test device according to claim 1 it is characterised in that：Described multiplying power switchs and is
Three knife 11 position rotary band switch, multiplying power switch have multiplying power switching knob, multiplying power switching knob drive under coaxially with
First moving contact D31 of step motion, the second moving contact D32, the 3rd moving contact D33；11 being equipped with the first moving contact D31
Individual static contact J311～J3111,11 static contact J321～J3211 being equipped with the second moving contact D32, dynamic with the 3rd tactile
Head D33 cooperation is provided with 11 static contact J331～J3311；Multiplying power switching knob is arranged on casing；
Described multiplying power switch is electrically connected with discharge switch by its first moving contact D31 and the second moving contact D32.
5. digital fiber ratio resistance test device according to claim 4 it is characterised in that：Described series connection partial pressure electricity
Road includes resistance R6～R16 totally 11 resistance；Static contact J311～J3111 that each one end of resistance R6～R16 is switched with multiplying power
Corresponding electrical connection；Each other end of resistance R6～R16 is all grounded；When test uses, resistance R6～R16 is according to the gear arranging and quilt
Survey fiber samples（Can be considered resistance）Series connection partial pressure.
6. digital fiber ratio resistance test device according to claim 4 it is characterised in that：Described described power supply
The second moving contact D32 that selection circuit is switched from multiplying power and with 11 static contact J321～J3211 with it and be connected use
Wire constitute；Wherein, form one after static contact J321, static contact J322 and static contact J323 are connected by conductor in parallel
Common junction, this common junction is the first power input of power selection circuit；Static contact J324～J3211 totally 8 stationary contacts
Head forms a common junction after connecting by conductor in parallel, and this common junction is the second source input of power selection circuit
End；Power selection circuit is electrically connected with power module by its first and second power input.
7. digital fiber ratio resistance test device according to claim 4 it is characterised in that：Described multiplying power switch shelves
Position sample circuit includes resistance R17～R29 totally 13 resistance；Wherein, one end ground connection of resistance R17, the other end of resistance R17 leads to
The static contact J331 crossing multiplying power switch is concatenated with one end of resistance R18；Resistance R18～R28 is sequentially connected in series；The stationary contact of multiplying power switch
Head J332～J3311 electrical connection corresponding with the concatenation point of every 2 adjacent resistors of resistance R18～R28 successively；Resistance R28 does not go here and there
The other end connecing has common junction with one end of resistance R29, and this common junction connects the DC3.3V power supply output that micro controller has
End；The 3rd moving contact D33 that the other end of resistance R29 is switched with multiplying power electrically connects；Multiplying power switch the 3rd moving contact D33 with micro-
The multiplying power switch position sampled signal input electrical connection that control device is provided with.
8. digital fiber ratio resistance test device according to claim 1 it is characterised in that：Described sample compression structure
Part is electric pushrod or air-leg.
9. a kind of it is used for testing fiber than electricity according to the arbitrary described digital fiber ratio resistance test device of claim 1 to 8
The method of testing of resistance is it is characterised in that comprise the following steps：
1. device school zero：Engaging means power supply preheats, and inputs fiber samples type to be measured by touch-screen, and preheating terminates rear basis
Discharge switch is placed in electric discharge gear by the prompting of touch-screen；Discharge switch gear sample circuit automatically detects discharge switch and puts
After electric discharge gear, now high-impedance amplifier input end grounding；Micro controller is through high-impedance amplifier and high-precision a/d converter
Gather and save set is because of the null offset magnitude of voltage Vo of outside induced voltage and the generation of device circuit Parameters variation reason；
2. device school is full：School is full to point out storing electric switch to the full gear in school to carry out according to touch-screen, and rear micro controller meter is completely terminated in school
Calculate and preserve ideal voltage value Vf and school full voltage correction value Vi；Point out to put electric switch to the gear that discharges according to touch-screen；
3. fiber samples corresponding multiplying power gear and test voltage are selected：According to fiber samples to be measured, determine its corresponding multiplying power
Gear；Multiplying power switch is placed in the multiplying power gear of setting；Required test voltage is synchronously chosen；
4. fiber samples test：Fiber samples to be measured are put in testing cassete and testing cassete is in place；By touch-screen to micro-control
System sends compression sample order, and sample compression element conpressed fibers sample is to setting position；Storing is pointed out to establish by cable according to touch-screen
Close to test gear；Micro controller automatically begins to countdown in 60 seconds；Power module adds default test voltage to testing cassete；High resistant
Anti- amplifier 4 detects that multiplying power switchs test signal voltage value Vm of formation on connect multiplying power resistance, amplified by high-precision A/D
Converter 5 is converted into data signal and sends micro controller；Test signal voltage value Vm transmission touch-screen is shown by micro controller；Micro controller
Gather the gear number of now multiplying power switch by multiplying power switch position sample circuit simultaneously, determine the corresponding multiplying power resistance prestoring
Value Rm；Determine current test voltage gear simultaneously；It is real-time that micro controller obtains test voltage by test voltage sample circuit simultaneously
Detected value Vt；
5. calculate the resistance value of tested fiber samples：Micro controller utilizes the null offset magnitude of voltage Vo of gained, reason in abovementioned steps
Think magnitude of voltage Vf, school full voltage correction value Vi and test signal voltage value Vm and detected by test voltage sample circuit
Real-time voltage value Vt, calculates resistance value Rx of tested fiber samples；
6. calculate the ratio resistance value of tested fiber samples：Micro controller according to the parameter of tested fiber samples of input and calculates
Tested fiber samples resistance value Rx, the ratio resistance value of this sample is calculated according to the general formula that ratio resistance calculates, concurrently
Touch-screen is sent to show in real time；Micro controller preserves resistance value Rx of tested fiber samples and the ratio resistance value of this detection；
7. take off testing cassete：Discharge switch is put by electric gear according to touch-screen prompting；Discharge switch gear sample circuit is automatic
Detect discharge switch have been placed in discharge gear after, micro controller Control Assay compression element is disengaged with testing cassete, takes off survey
Examination box, takes out this tested fiber samples；
8. 4. to step 7., the lower portion fiber samples of test, until finish the required test sample number of times of test for repeat step.
10. method of testing according to claim 9 it is characterised in that：The described step 2. full method bag in middle device school
Include following steps：
The first step, calculates ideal voltage value Vf：Micro controller adopts formula（1）Calculate ideal voltage value Vf:
Vf=Rs × Vt/ (Rm-Rs)（1）
In formula, Vt is the test voltage value that when school is full, micro controller receives the actual measurement that test voltage sample circuit sends, and Rs, Rm are micro-
For the resistance value of full scale when what control device was preset can make test device school full, wherein Rs can be considered sample resistance value, and Rm can be considered
Multiplying power resistance value；
Second step, calculates and preserves school full voltage correction value：Micro controller adopts formula（2）Calculate and preserve school full voltage correction value
Vi：
Vi=Vf- (Va-Vo)（2）
In formula, Va is the voltage actual measurement of the multiplying power resistance Rm that micro controller obtains through high-impedance amplifier and high-precision a/d converter
Value, Vo is the null offset magnitude of voltage of step 1. middle gained, and Vf is the ideal voltage value of first step gained in this step；
Described step 4. in, micro controller is adopted to test signal voltage value Vm and is selected with the following method：
If test signal voltage value Vm that touch-screen shows is basicly stable constant, touch-screen prompting confirms that currency is test
Value；If test signal voltage value Vm is drifted about in time, microcontroller automatically by 60s the countdown concluded when test signal voltage value
Vm is as the measured value confirming；
Described step 5. in, the method for resistance value that micro controller calculates tested fiber samples comprises the following steps：
The first step, first adopts formula（3）Calculate correction value Vmc of test signal voltage value Vm：
Vmc=(Vm-Vo) × Vi/Vf（3）
In formula, Vo is the null offset magnitude of voltage of step 1. middle gained, and Vm is the test signal voltage value of step 4. middle gained, Vi
School full voltage correction value for step 2. middle gained；Vf is the ideal voltage value of step 2. middle gained；
Second step：Adopt formula again（4）Calculate resistance value Rx of tested fiber samples：
Rx=Vmc × Rm/ (Vt-Vmc)（4）
In formula, Vt is the real-time voltage value currently being detected by test voltage sample circuit, and Rm is current multiplying power resistance value.
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