CN106405243B - Digital fiber specific resistance testing device and testing method thereof - Google Patents
Digital fiber specific resistance testing device and testing method thereof Download PDFInfo
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- CN106405243B CN106405243B CN201610982763.XA CN201610982763A CN106405243B CN 106405243 B CN106405243 B CN 106405243B CN 201610982763 A CN201610982763 A CN 201610982763A CN 106405243 B CN106405243 B CN 106405243B
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Abstract
The invention provides a digital fiber specific resistance testing device and a testing method, wherein the device comprises a box body, a testing box, a sample compression member and a circuit device; the circuit device comprises 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 microcontroller, a full-scale correction voltage circuit, a discharge switch gear sampling circuit matched with the discharge switch, a serial voltage division circuit matched with the multiplying power switch, a power supply selection circuit, a test voltage sampling circuit and a multiplying power switch gear sampling circuit. The device has the advantages of simple and compact structure, lower cost, good man-machine interaction, high test precision, convenient and safe use and difficult error; the testing method is simple, convenient, easy, safe and reliable, and can obtain a high-precision testing result.
Description
Technical Field
The invention relates to the field of fiber material measuring instruments, in particular to a digital fiber specific resistance testing device and a testing method thereof.
Background
The textile fiber has low conductive capability under the action of an external electric field, is a good insulator, has generally high specific resistance (resistivity), and is especially synthetic fibers such as terylene, acrylic fibers, polyvinyl chloride fibers and the like with low hygroscopicity. During processing and use, static electricity is easily generated, and for this reason, the specific resistance value of the fiber must be controlled within a certain range. The fiber specific resistance tester is necessary for textile fiber processing and using enterprises. At present, the measurement of the fiber specific resistance is mostly carried out by adopting a pointer analog fiber specific resistance instrument, and the main technical defects are as follows: 1. the resistance value measurement range is small, and the test requirements of the specific resistance of the conductive fiber which is developed increasingly at present cannot be met; 2. the pointer ammeter indicates the resistance value to generate manual reading errors; 3. the test precision is poor, and the reading of the test result is unstable; 4. the measured result is a resistance value, and the resistance value needs to be calculated manually to be a specific resistance. Therefore, according to the requirements of the chemical fiber industrial production and the scientific research and inspection institution for testing the specific resistance of the fiber, a digital fiber specific resistance tester is urgently needed to improve the accuracy and the efficiency of the test result. Because the insulation resistance of some fibers is extremely high, the tester can only use the wave band switch made of high insulation resistance ceramic materials, and therefore gear sampling of the wave band switch is difficult. The Chinese patent document with the application number of 201510822232.X, the publication number of CN105425043A and the inventive and created name of 'test sample automatic compression fiber specific resistance testing device and testing method' discloses a digital fiber specific resistance testing device and testing method thereof, which adopts the method of adding a low-resistance testing switch and a testing selection switch for testing low specific resistance value, thereby not only making the testing operation complicated, but also reducing the insulation resistance of a testing circuit and narrowing the testing range of high specific resistance value; when a tester mistakenly sets the low-specific resistance value sample as a high-resistance test, the instrument is possibly damaged due to overhigh voltage or overlarge current; since the resistance value of the sample is determined by the reading of the meter and the multiplying power indicated by the range selection switch, the document does not disclose how to obtain the multiplying power indicated by the range selection switch in the test.
Disclosure of Invention
The purpose of the invention is: aiming at the defects of the prior art, the digital fiber specific resistance testing device and the testing method thereof are provided, wherein the digital fiber specific resistance testing device has the advantages of digital measurement, wide testing range, high testing efficiency and testing accuracy, simple and safe operation and low possibility of error.
The technical scheme of the invention is as follows: the invention relates to a digital fiber specific resistance testing device, which comprises a box body, a testing box, a sample compression member and a circuit device, wherein the box body is provided with a box body; the circuit device comprises a high impedance amplifier and a high precision A/D converter; the test box is used for accommodating a tested fiber sample and is arranged on the box body in a pluggable manner; the test box is provided with a first electrode plate and a second electrode plate; the structure is characterized in that: the circuit device also comprises a discharge switch, a multiplying power switch, a power supply module, a touch screen, a microcontroller, a discharge switch gear sampling circuit, a series voltage division circuit, a power supply selection circuit, a test voltage sampling circuit, a multiplying power switch gear sampling circuit and a full scale correction voltage circuit; wherein:
a discharge switch for selecting a device to perform a calibration, discharge or test function; the discharge switch is respectively and electrically connected with the first electrode plate and the second electrode plate of the test box, the high impedance amplifier, the multiplying power switch, the discharge switch gear sampling circuit, the full scale correction voltage circuit and the microcontroller;
the multiplying power switch is used for selecting the testing voltage, the measuring range and the multiplying power resistance gear, and is respectively and electrically connected with the discharge switch, the power supply module, the series voltage division circuit, the power supply selection circuit, the testing voltage sampling circuit, the multiplying power switch gear sampling circuit and the microcontroller;
the high-impedance amplifier and the high-precision A/D converter are used for detecting and sending a sample detection voltage signal to the microcontroller; the high-impedance amplifier is connected with the high-precision A/D converter in series, and the input end of the high-impedance amplifier is electrically connected with the discharge switch; the output end of the high-precision A/D converter is electrically connected with the microcontroller;
the power supply module is used for providing power supply required by the test; the output power of the power supply module is controlled by the microcontroller;
the sample compression component is used for extruding the tested fiber sample under the control of the microcontroller during test use so that the tested fiber sample is in close contact with the first electrode plate and the second electrode plate of the test box;
the touch screen is used for man-machine information interaction and is electrically connected with the two-way signal of the microcontroller;
the microcontroller is used for comprehensively controlling the operation of the device, calculating the specific resistance value and storing data;
the discharging switch gear sampling circuit is used for sending a signal to the microcontroller so that the microcontroller automatically judges whether the device is in a full calibration state, a discharging state or a testing state; the discharge switch gear sampling circuit is respectively and electrically connected with the discharge switch and the microcontroller;
the series voltage division circuit is used for expanding the resistance measurement range of the tested fiber and is electrically connected with the multiplying power switch, and when the series voltage division circuit is used, the series voltage division circuit is connected with the tested fiber sample in series for voltage division;
the power supply selection circuit is used for selecting the voltage required by the test; the power supply selection circuit is respectively electrically connected with the multiplying power switch and the power supply module;
the test voltage sampling circuit is used for automatically detecting a current test voltage real-time value when in use; the test voltage sampling circuit is respectively electrically connected with the power supply selection circuit and the microcontroller;
the multiplying power switch gear sampling circuit is used for sampling and sending a range signal to the microcontroller; the multiplying power switch gear sampling circuit is respectively and electrically connected with the multiplying power switch and the microcontroller;
the full scale correction voltage circuit is used for providing a full scale correction voltage signal required by full scale of the device, and the input end of the full scale correction voltage circuit is electrically connected with the power supply module; the output end of the fullness correction voltage circuit is electrically connected with the discharge switch.
The further scheme is as follows: the discharge switch is a three-pole three-position rotary type wave band switch; the discharging switch is provided with a discharging switch knob, a first moving contact D21, a second moving contact D22 and a third moving contact D23 which coaxially and synchronously move under the driving of the discharging switch knob, 3 static contacts J211, J212 and J213 which are matched with the first moving contact D21, 3 static contacts J221, J222 and J223 which are matched with the second moving contact D22, and 3 static contacts J231, J232 and J233 which are matched with the third moving contact D23; the discharge switch knob is arranged on the box body.
The further scheme is as follows: the discharge switch gear sampling circuit comprises 5 resistors R1-R5; one end of the resistor R1 is grounded, and the other end of the resistor R1 is electrically connected with one end of the resistor R2 through a static contact J231 of the discharge switch; the other end of the resistor R2, one end of the resistor R3 and a static contact J232 of the discharge switch are collinear; the other end of the resistor R3, one end of the resistor R4 and a static contact J233 of the discharge switch are collinear; the other end of the resistor R4 and one end of the resistor R5 are provided with a common contact which is electrically connected with a DC3.3V power output end of the micro controller; the other end of the resistor R5 is connected with a third moving contact D23 of the discharge switch; and the third moving contact D23 of the discharge switch is electrically connected with a discharge switch gear sampling signal input end arranged on the microcontroller.
The further scheme is as follows: the multiplying power switch is a three-pole eleven-position rotary type waveband switch, and is provided with a multiplying power switch knob, a first moving contact D31, a second moving contact D32 and a third moving contact D33 which coaxially and synchronously move under the drive of the multiplying power switch knob; 11 static contacts J311-J3111 matched with the first moving contact D31, 11 static contacts J321-J3211 matched with the second moving contact D32, and 11 static contacts J331-J3311 matched with the third moving contact D33; the multiplying power switch knob is arranged on the box body;
the multiplying power switch is electrically connected with the discharge switch through a first moving contact D31 and a second moving contact D32.
The further scheme is as follows: the series voltage division circuit comprises 11 resistors R6-R16; one ends of the resistors R6-R16 are correspondingly and electrically connected with static contacts J311-J3111 of the multiplying power switch; the other ends of the resistors R6-R16 are grounded; when the fiber testing device is used for testing, the resistors R6-R16 are connected with a tested fiber sample (which can be regarded as resistors) in series for voltage division according to the set gears.
The further scheme is as follows: the power supply selection circuit is composed of a second moving contact D32 of a multiplying power switch, 11 fixed contacts J321-J3211 matched with the second moving contact D, and a lead for connection; the static contact J321, the static contact J322 and the static contact J323 are connected in parallel through a wire to form a common connection point, and the common connection point is a first power supply input end of the power supply selection circuit; 8 static contacts J324-J3211 are connected in parallel through a wire to form a common connection point, and the common connection point is a second power supply input end of the power supply selection circuit; the power supply selection circuit is electrically connected with the power supply module through the first power supply input end and the second power supply input end.
The further scheme is as follows: the multiplying power switch gear sampling circuit comprises 13 resistors R17-R29; one end of the resistor R17 is grounded, and the other end of the resistor R17 is connected in series with one end of the resistor R18 through a static contact J331 of the multiplying power switch; the resistors R18-R28 are connected in series in sequence; static contacts J332-J3311 of the multiplying power switch are electrically connected with the series connection points of every 2 adjacent resistors R18-R28 in sequence; the other end of the resistor R28, which is not connected in series, and one end of the resistor R29 are provided with a common connection point, and the common connection point is connected with a DC3.3V power output end of the microcontroller; the other end of the resistor R29 is electrically connected with a third moving contact D33 of the multiplying power switch; and a third moving contact D33 of the multiplying power switch is electrically connected with a sampling signal input end of a gear of the multiplying power switch, which is arranged on the microcontroller.
The further scheme is as follows: the sample compression member is an electric push rod or a pneumatic push rod.
The testing method of the digital fiber specific resistance testing device for testing the fiber specific resistance comprises the following steps:
(1) zero calibration of the device: the power supply of the device is switched on for preheating, the type of the fiber sample to be detected is input through the touch screen, and the discharge switch is placed in a discharge gear according to the prompt of the touch screen after preheating is finished; after the discharge switch gear sampling circuit automatically detects that the discharge switch is arranged at a discharge gear, the input end of the high-impedance amplifier is grounded at the moment; the microcontroller collects and stores a zero drift voltage value Vo of the device caused by external induction voltage and circuit parameter change of the device through a high impedance amplifier and a high-precision A/D converter;
(2) the device is full: prompting the placing electric switch to a full-calibration gear for full calibration according to the touch screen, and calculating and storing an ideal voltage value Vf and a full-calibration voltage correction value Vi by the micro controller after the full calibration is finished; placing an electric switch to a discharging gear according to the prompt of the touch screen;
(3) selecting a multiplying power gear and a test voltage corresponding to the fiber sample: determining a corresponding multiplying power gear according to a fiber sample to be detected; placing a multiplying power switch in a set multiplying power gear; the required test voltage is selected synchronously;
(4) testing of fiber samples: putting a fiber sample to be tested into a test box and positioning the test box in place; sending a sample compression command to the micro controller through the touch screen, and compressing the fiber sample to a set position by a sample compression member; placing an electric switch to a test gear according to the prompt of the touch screen; the microcontroller automatically starts the countdown for 60 seconds; the power supply module applies preset test voltage to the test box; the high-impedance amplifier 4 detects a voltage value Vm of a test signal formed on a multiplying factor resistor connected with the multiplying factor switch, and the voltage value Vm is converted into a digital signal sending microcontroller by the high-precision A/D converter 5 after being amplified; the micro controller sends the voltage value Vm of the test signal to a touch screen for display; the microcontroller simultaneously collects the gear number of the multiplying power switch at the moment through the multiplying power switch gear sampling circuit and determines a prestored corresponding multiplying power resistance value Rm; simultaneously determining the current test voltage gear; the microcontroller simultaneously obtains a real-time test voltage value Vt through the test voltage sampling circuit;
(5) calculating the resistance value of the tested fiber sample: the microcontroller calculates the resistance Rx of the tested fiber sample by using the zero drift voltage value Vo, the ideal voltage value Vf, the full-correction voltage correction value Vi, the test signal voltage value Vm and the real-time voltage value Vt detected by the test voltage sampling circuit;
(6) calculating the specific resistance value of the tested fiber sample: the microcontroller calculates the specific resistance value of the sample according to the input parameters of the tested fiber sample and the calculated resistance value Rx of the tested fiber sample and a general formula for calculating the specific resistance, and sends the specific resistance value to the touch screen for real-time display; the microcontroller saves the resistance value Rx and the specific resistance value of the detected fiber sample detected this time;
(7) taking down the test box: placing an electric gear of the discharge switch according to the prompt of the touch screen; after the discharge switch gear sampling circuit automatically detects that the discharge switch is arranged at a discharge gear, the microcontroller controls the sample compression member to be separated from the test box, the test box is taken down, and the fiber sample to be tested at this time is taken out;
(8) and (5) repeating the steps (4) to (7), and testing the next fiber sample until the number of times of testing the sample required by the test is finished.
The further scheme is as follows: the method for device topping in the step (2) comprises the following steps:
firstly, calculating an ideal voltage value Vf: the microcontroller calculates the ideal voltage value Vf by adopting the formula (1):
Vf＝Rs×Vt/(Rm－Rs) （1）
wherein, vt is the actually measured test voltage value sent by the test voltage sampling circuit received by the microcontroller when the calibration is full, rs and Rm are resistance values which are preset by the microcontroller and can enable the test device to be in full range when the calibration is full, wherein Rs can be regarded as a sample resistance value, and Rm can be regarded as a multiplying factor resistance value;
and step two, calculating and storing a correction value of the full-voltage: the microcontroller calculates and stores a full-correction voltage correction value Vi by adopting a formula (2):
Vi＝Vf－(Va－Vo) （2）
wherein Va is a voltage measured value of a multiplying factor resistor Rm obtained by the microcontroller through a high-impedance amplifier and a high-precision A/D converter, vo is a zero drift voltage value obtained in the step (1), and Vf is an ideal voltage value obtained in the first step in the step;
in the step (4), the microcontroller selects the test signal voltage value Vm by the following method:
if the voltage value Vm of the test signal displayed by the touch screen is basically stable and unchanged, prompting to confirm that the current value is the test value by the touch screen; if the test signal voltage value Vm drifts along with time, the microcontroller automatically takes the test signal voltage value Vm after the countdown of 60s is finished as a confirmed measured value;
in the step (5), the method for calculating the resistance value of the measured fiber sample by the microcontroller comprises the following steps:
firstly, calculating a correction value Vmc of a test signal voltage value Vm by adopting a formula (3):
Vmc＝(Vm－Vo)×Vi/Vf （3）
wherein Vo is the zero drift voltage value obtained in the step (1), vm is the test signal voltage value obtained in the step (4), and Vi is the full-corrected voltage correction value obtained in the step (2); vf is the ideal voltage value obtained in step (2);
the second step is that: and calculating the resistance value Rx of the tested fiber sample by adopting a formula (4):
Rx=Vmc×Rm/(Vt－Vmc) （4）
wherein Vt is a real-time voltage value currently detected by the test voltage sampling circuit, and Rm is a current multiplying factor resistance value.
The invention has the positive effects that: (1) The digital fiber specific resistance testing device has the advantages of simple and compact structure, lower cost, good man-machine interaction, convenience and safety in use and difficulty in making mistakes, and the testing operation can be completed only through the two knobs and the touch screen when the digital fiber specific resistance testing device is used. (2) The digital fiber specific resistance testing device can automatically monitor the states of a testing power supply, a discharge switch and a multiplying power switch in real time when in use, has a fault-tolerant protection function and good safety and reliability. (3) The digital fiber specific resistance testing device takes the zero drift voltage value, the full-correction voltage correction value and the like of the device into consideration and automatically modifies the zero drift voltage value, the full-correction voltage correction value and the like when in testing use, thereby effectively improving the testing precision of the device. (4) The digital fiber specific resistance testing device is provided with the Ethernet port, the USB port and the serial port, is convenient for networking, plugging a USB flash disk and the like, and expands the cost performance of the device. (5) The method for testing the fiber sample by using the digital fiber specific resistance testing device is simple, convenient, easy, safe and reliable and can obtain a high-precision testing result.
Drawings
FIG. 1 is a schematic diagram of a structure of the apparatus of the present invention;
FIG. 2 is a schematic block diagram of the circuit structure of the apparatus of the present invention;
fig. 3 is a schematic structural view of a first set of moving and stationary contacts of the discharge switch in fig. 2, and the electrical connection relationship is also schematically shown;
fig. 4 is a schematic structural view of a second set of moving and stationary contacts of the discharge switch in fig. 2, and the electrical connection relationship is also schematically shown;
fig. 5 is a schematic structural diagram of a third set of moving and stationary contacts of the discharging switch in fig. 2, which also schematically shows an electrical connection relationship with the gear sampling circuit of the discharging switch in fig. 2;
fig. 6 is a schematic structural diagram of a first set of moving and stationary contacts of the multiple-ratio switch in fig. 2, and also schematically shows an electrical connection relationship between the first set of moving and stationary contacts and the serial voltage dividing circuit in fig. 2;
fig. 7 is a schematic structural view of a second set of moving and stationary contacts of the multiple-ratio switch in fig. 2;
fig. 8 is a schematic structural diagram of a third set of moving and stationary contacts of the multiple-ratio switch in fig. 2, and also schematically shows an electrical connection relationship between the third set of moving and stationary contacts and the gear position sampling circuit of the multiple-ratio switch in fig. 2.
The reference numbers in the above figures are as follows:
the housing 100 is provided with a plurality of openings,
the test kit (1) is provided with a test strip,
a discharge switch 2, a discharge switch knob 2-1, a discharge switch gear sampling circuit 21,
a multiplying power switch 3, a multiplying power switch knob 3-1, a series voltage division circuit 31, a test voltage sampling circuit 32 and a multiplying power switch gear sampling circuit 33;
a high impedance amplifier 4, a high precision a/D converter 5,
a power module 6, a power switch 6-1, a full scale correction voltage circuit 61,
the sample-compressing member 7 is provided with,
the position of the touch screen 8 is such that,
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
(example 1)
Referring to fig. 1 and 2, the digital fiber specific resistance testing apparatus of the present embodiment is mainly composed of a case 100, a test cartridge 1, a sample compression member 7, and a circuit device. The circuit device comprises a discharge switch 2, a multiplying power switch 3, a high-impedance amplifier 4, a high-precision A/D converter 5, a power module 6, a touch screen 8, a microcontroller 9, a discharge switch gear sampling circuit 21, a series voltage division circuit 31, a power selection circuit, a test voltage sampling circuit 32, a multiplying power switch gear sampling circuit 33 and a full scale correction voltage circuit 61.
The microcontroller 9 is used for comprehensively controlling the operation of the device, calculating the specific resistance value and storing data, and the microcontroller 9 is provided with a discharge switch gear sampling signal input end, a sample detection signal input end, a first test voltage sampling signal input end, a second test voltage sampling signal input end, a multiplying power switch gear sampling signal input end, a first power output control end, a second power output control end, a sample compression member control signal output end, a touch screen information interaction end and a DC3.3V power output end; the microcontroller 9 is further provided with an ethernet port 91, a USB port 92, and a serial port 93 provided in the casing 100. In this embodiment, the microcontroller 9 preferably adopts an industrial MCU.
The power supply module 6 is used for providing power supply required by the test; the power module 6 consists of a 1V stabilized voltage power supply and a 100V stabilized voltage power supply, and the power module 6 is provided with a power input end, a first power output end, a second power output end, a first power output control signal input end and a second power output control signal input end; the first and second power output control signal input ends of the power module 6 are electrically connected with the first and second power output control ends of the micro-controller 9 correspondingly; when the power supply is used, the power supply input end of the power supply module 6 is externally connected with 220V mains supply through the power switch 6-1 arranged on the box body 100, the first power supply output end of the power supply module 6 outputs a DC1V power supply, and the second power supply output end of the power supply module 6 outputs a DC100V power supply; the output power of the power module 6 is controlled by the microcontroller 9; the power module 6 has an overcurrent protection function when outputting a 100V regulated power supply.
The full-scale correction voltage circuit 61 is used for providing a full-scale correction voltage signal required by full-scale correction, and an input end of the full-scale correction voltage circuit 61 is electrically connected with a second power supply output end (100V) of the power supply module 6.
The test box 1 is installed on the box body 100 in a pluggable manner; the test box 1 is provided with a first electrode plate and a second electrode plate, and the distance between the first electrode plate and the second electrode plate is fixed. When the test box is used, the test box 1 contains a tested fiber sample, and the tested fiber sample is pressed by the sample compression member 7 and is in close contact with the first electrode plate and the second electrode plate in the test box 1.
Referring to fig. 3 to 5, the discharge switch 2 is a three-pole three-position rotary band switch, the discharge switch 2 has a discharge switch knob 2-1, a first moving contact D21, a second moving contact D22, and a third moving contact D23 that move coaxially and synchronously under the drive of the discharge switch knob 2-1, 3 fixed contacts J211, J212, and J213 are provided in cooperation with the first moving contact D21, 3 fixed contacts J221, J222, and J223 are provided in cooperation with the second moving contact D22, and 3 fixed contacts J231, J232, and J233 are provided in cooperation with the third moving contact D23; the discharge switch knob 2-1 is provided on the case 100.
A first moving contact D21 of the discharge switch 2 is electrically connected with a first electrode plate of the test box 1; the fixed contact J211 is electrically connected with the output end of the full scale correction voltage circuit 61; a static contact J212 is grounded; the second moving contact D22 of the discharge switch 2 is electrically connected with the second electrode plate of the test box 1; a static contact J221 is vacant; the static contact J222 is grounded;
the discharge switch gear sampling circuit 21 is used for sending a signal to the microcontroller 9 so that the microcontroller 9 automatically judges whether the device is in a fully calibrated, discharged or tested state; the discharge switch gear sampling circuit 21 is matched with the discharge switch 2, and the discharge switch gear sampling circuit 21 consists of 5 resistors R1-R5; one end of the resistor R1 is grounded, and the other end of the resistor R1 is electrically connected with one end of the resistor R2 through a static contact J231; the other end of the resistor R2, one end of the resistor R3 and the static contact J232 are collinear; the other end of the resistor R3, one end of the resistor R4 and a static contact J233 are collinear; the other end of the resistor R4 and one end of the resistor R5 are provided with a common contact which is connected with the DC3.3V power output end of the microcontroller 9; the other end of the resistor R5 is connected with a third moving contact D23 of the discharge switch 2; the third moving contact D23 of the discharge switch 2 is electrically connected with the discharge switch gear sampling signal input end of the microcontroller 9.
The discharge switch 2 is used for selecting the control device to execute functions of full calibration, discharge or test; the three-gear function of the discharge switch 2 is sequentially set from 1 to 3 to be full, discharged and tested; when the discharge switch knob 2-1 is placed in a full gear during use, the first moving contact D21 is communicated with the fixed contact J211, the second moving contact D22 is communicated with the fixed contact J221, and the third moving contact D23 is communicated with the fixed contact J231; when the discharge switch knob 2-1 is arranged at a discharge gear, the first moving contact D21 is communicated with the fixed contact J212, the second moving contact D22 is communicated with the fixed contact J222, and the third moving contact D23 is communicated with the fixed contact J232; when the discharge switch knob 2-1 is placed in a test gear, the first movable contact D21 is connected with the fixed contact J213, the second movable contact D22 is connected with the fixed contact J223, and the third movable contact D23 is connected with the fixed contact J233.
The high-impedance amplifier 4 is connected with the high-precision A/D converter 5 in series and used for detecting and sending a sample detection voltage signal to the microcontroller 9; the high impedance amplifier 4 and the high precision a/D converter 5 are well established prior art and will not be described in detail. The input end of the high impedance amplifier 4 is electrically connected with a first moving contact D21 of the discharge switch 2; the output end of the high-precision A/D converter 5 is electrically connected with the sample detection signal input end of the micro-controller 9.
Referring to fig. 6 to 8, a multiplying power switch 3 is used for selecting a test voltage, a measuring range and a multiplying power resistance gear; the multiplying power switch 3 is a three-pole eleven-bit rotary type waveband switch, the multiplying power switch 3 is provided with a multiplying power switch knob 3-1, a first moving contact D31, a second moving contact D32 and a third moving contact D33 which coaxially and synchronously move under the driving of the multiplying power switch knob 3-1, 11 static contacts J311-J3111 are arranged in a matched manner with the first moving contact D31, 11 static contacts J321-J3211 are arranged in a matched manner with the second moving contact D32, and 11 static contacts J331-J3311 are arranged in a matched manner with the third moving contact D33; the multiplying power switch knob 3-1 is arranged on the box body 100.
A first moving contact D31 of the multiplying power switch 3 is electrically connected with a static contact J213 of the discharge switch 2; the second moving contact D32 of the multiplying power switch 3 is electrically connected with the fixed contact J223 of the discharge switch 2.
Referring to fig. 6, the series voltage divider 31 is used to expand the resistance measurement range of the measured fiber, and the series voltage divider 31 is mainly composed of 11 multiplying resistors R6 to R16; one ends of the resistors R6-R16 are correspondingly and electrically connected with static contacts J311-J3111 of the multiplying power switch 3; the other ends of the resistors R6-R16 are grounded; during testing, multiplying power resistors R6-R16 are connected with a tested fiber sample (which can be regarded as a resistor) in series for voltage division according to the set gears.
Referring to fig. 7, a power selection circuit for selecting a voltage required for a test; the power supply selection circuit consists of a second moving contact D32 of the multiplying power switch 3, 11 fixed contacts J321-J3211 matched with the second moving contact D and a connecting lead; the static contact J321, the static contact J322 and the static contact J323 are connected in parallel through a conducting wire to form a common connection point, and the common connection point is a first power supply input end of the power supply selection circuit; a first power supply input end of the power supply selection circuit is electrically connected with a first power supply output end (DC 1V) of the power supply module 6; 8 static contacts J324-J3211 are connected in parallel through a wire to form a common connection point, and the common connection point is a second power supply input end of the power supply selection circuit; the second power supply input end of the power supply selection circuit is electrically connected with the second power supply output end (DC 100V) of the power supply module 6; in the use process, when the second moving contact D32 is connected with any one of the fixed contacts J321-J323, the device selects a power supply for DC1V test; when the second moving contact D32 is connected with any one of the fixed contacts J324-J3211, the device selects a power supply for DC100V test.
The test voltage sampling circuit 32 is used for automatically detecting a current test voltage real-time value when in use; the test voltage sampling circuit 33 is provided with a first signal input end, a second signal input end, a first signal output end and a second signal output end, and the first signal input end and the second signal input end of the test voltage sampling circuit 33 are correspondingly and electrically connected with the first power supply input end and the second power supply input end of the power supply selection circuit; the first and second signal output terminals of the test voltage sampling circuit 33 are electrically connected to the first and second test voltage sampling signal input terminals of the microcontroller 9.
Referring to fig. 8, a multiplying power switch gear sampling circuit 33 for sampling and sending a range signal to the microcontroller 9; the multiplying power switch gear sampling circuit 33 is matched with the multiplying power switch 3, and the multiplying power switch gear sampling circuit 33 consists of 13 resistors R17-R29; one end of the resistor R17 is grounded, and the other end of the resistor R17 is connected in series with one end of the resistor R18 through a static contact J331; the resistors R18-R28 are connected in series in sequence; the static contacts J332 to J3311 are electrically connected with the series connection point of every 2 adjacent resistors of the resistors R18 to R28 in sequence, for example, the static contact J332 is electrically connected with the series connection point of the resistor R18 and the resistor R19; the static contact J3311 is electrically connected with the serial connection point of the resistor R27 and the resistor R28, and so on; the other end of the resistor R28 which is not connected in series and one end of the resistor R29 are provided with a common connection point, and the common connection point is connected with the DC3.3V power output end of the microcontroller 9; the other end of the resistor R29 is electrically connected with a third moving contact D33 of the multiplying power switch 3; the third moving contact D33 of the multiplying power switch 3 is electrically connected with the multiplying power switch gear sampling signal input end of the microcontroller 9. In this embodiment, the resistances of the resistors R17 to R27 are 100 Ω, the resistance of the resistor R28 is 560 Ω, and the resistance of the resistor R29 is 20k Ω. Resistor R17 is used to distinguish the voltage of the first gear from the ground voltage, resistor R28 is used to distinguish the voltage of the last gear from +3.3V, and resistor R29 is used to distinguish the voltage of multiplying power switch 3, which is not yet connected to the stationary contact of the gear during rotation, from about +3.3V.
The multiplying power switch 3 is driven by a multiplying power switch knob 3-1 arranged on the box body 100, so that a first moving contact D31, a second moving contact D32 and a third moving contact D33 of the multiplying power switch 3 are respectively and synchronously contacted with fixed contacts of 11 gears respectively arranged on the first moving contact, the second moving contact and the third moving contact; the multiplying power switch knob 3-1 marks 11 gears on the box body 100, and the resistance range corresponding to the 11 gears is 10 omega-10 3 Ω、10 3 Ω～10 5 Ω、10 5 Ω～10 7 Ω、10 6 Ω～10 7 Ω、10 7 Ω～10 8 Ω、10 8 Ω～10 9 Ω、10 9 Ω～10 10 Ω、10 10 Ω～10 11 Ω、10 11 Ω～10 12 Ω、10 12 Ω～10 13 Ω、10 13 Ω～10 14 Omega, when in use, when the multiplying power switch knob 3-1 is arranged at the first, the second and the third gear, the selected multiplying power resistance value is 10 2 Ω、10 4 Omega and 10 6 Omega, the selected test voltage value is 1V, and when the multiplying power switch knob 3-1 is placed in the fourth gear to the eleventh gear, the selected multiplying power resistance value is 10 4 Ω～10 11 Ω, the selected test voltage value is 100V at this time; the multiplying power switch knob 3-1 of the multiplying power switch 3 rotates anticlockwise to be incapable of rotating, at the moment, each moving contact of the multiplying power switch 3 is connected with a first gear static contact arranged with the moving contact, the microcontroller 9 samples a voltage of about 0.2V, when the multiplying power switch 3 rotates clockwise by one gear, the microcontroller 9 samples a voltage increased by about 0.2V, and the microcontroller 9 determines the gear of the multiplying power switch 3 according to the voltage.
Still referring to fig. 2, the sample compressing member 7 is used to compress the tested fiber sample placed in the test cartridge 1, so that the tested fiber sample is in close contact with the first electrode plate and the second electrode plate in the test cartridge 1. The sample compressing member 7 may be an electric push rod or a pneumatic push rod, and in this embodiment, an electric push rod is preferably used. The sample compression component 7 is provided with a control signal input end connected with the microcontroller 9, and the action of the sample compression component 7 is controlled by the microcontroller 9; the control signal input end of the sample compression member 7 is electrically connected with the sample compression member control signal output end of the micro controller 9.
The touch screen 8 is used for man-machine information interaction such as parameter input, operation selection, test and alarm information display, and the touch screen 8 is electrically connected with the information interaction end of the microcontroller 9 through bidirectional signals.
Referring to fig. 1 to 8, the digital fiber specific resistance testing apparatus of the present embodiment, which is used for the method for testing the specific resistance of the fiber, includes the following steps:
(1) zero calibration of the device: the power supply of the device is switched on for preheating, the type of a fiber sample to be detected is input through the touch screen 8, and after preheating is finished, the discharge switch knob 2-1 is rotated to place the discharge switch 2 in a discharge gear according to the prompt of the touch screen 8; after the device automatically detects that the discharge switch 2 is placed in a discharge gear through the discharge switch gear sampling circuit 21, the input end of the high-impedance amplifier 4 is grounded at the moment, namely, is connected with zero potential; the microcontroller 9 collects and stores the zero drift voltage value Vo of the device caused by external induction voltage and circuit parameter change of the device through the high impedance amplifier 4 and the high-precision A/D converter 5;
(2) the device is full: the touch screen 8 prompts the electric switch 2 to be placed to a full gear, and the discharge switch knob 2-1 is rotated to place the discharge switch 2 to the full gear; after the device automatically detects that the discharge switch 2 is set to a full gear, the device performs full calibration, and after the full calibration is finished, the touch screen 8 prompts the discharge switch 2 to be set to a discharge gear; the discharge switch 2 is placed in a discharge gear by rotating a discharge switch knob 2-1;
in this step, the method for the full calibration adopts the following steps:
firstly, calculating an ideal voltage value Vf: the microcontroller 9 calculates the ideal voltage value Vf using the formula (1):
Vf＝Rs×Vt/(Rm－Rs) （1）
wherein Vt is the actually measured test voltage value sent by the test voltage sampling circuit 32 received by the microcontroller 9 at the time of full calibration, rs and Rm are resistance values preset by the microcontroller 9 to enable the test device to be at full range at the time of full calibration, wherein Rs can be regarded as a sample resistance value, and Rm can be regarded as a multiplying factor resistance value; the ideal voltage Vf is a voltage that does not take into account various influences on the device.
And secondly, calculating and storing a corrected full voltage value: the microcontroller 9 calculates and stores the full-correction voltage correction value Vi by using the formula (2):
Vi＝Vf－(Va－Vo) （2）
in the formula, va is a voltage measured value of the multiplying factor resistor Rm acquired by the microcontroller 9 through the high impedance amplifier 4 and the high-precision a/D converter 5, vo is a zero drift voltage value obtained in the step (1), and Vf is an ideal voltage value obtained in the first step of the step;
(3) selecting a multiplying power gear and a test voltage corresponding to the fiber sample: determining a corresponding multiplying power gear according to a fiber sample to be detected, and rotating a multiplying power switch knob 3-1 to a set multiplying power gear; selecting a multiplying power gear by rotating a multiplying power switch knob 3-1, and selecting a test voltage corresponding to the gear;
(4) testing a fiber sample: putting a fiber sample (15 g of chemical short fiber) to be tested into the test box 1 and putting the test box 1 in place; a sample compression command is sent to the micro controller 9 through the touch screen 8, and the sample compression member 7 compresses the fiber sample to a set position; the touch screen 8 prompts the placing of the electric switch 2 to a test gear, and the discharge switch knob 2-1 is rotated to place the discharge switch 2 in the test gear; the device automatically detects that the discharge switch 2 is automatically started to count down for 60 seconds after the test gear is placed, the power supply module 6 adds preset test voltage to the test box 1, the majority of current passing through the fiber sample passes through the discharge switch 2 and the multiplying power switch 3 to the ground, a test signal voltage value Vm is formed on a multiplying power resistor connected with the multiplying power switch 3, the high-impedance amplifier 4 amplifies the voltage and converts the amplified voltage into a digital signal through the high-precision A/D converter 5, and then the digital signal is sent to the microcontroller 9; the touch screen 8 receives the test signal voltage value Vm sent by the microcontroller 9 and displays the test signal voltage value Vm in real time, and if the test signal voltage value Vm is basically stable and unchanged, the touch screen 8 prompts to confirm that the current value is the test value; if the test signal voltage value Vm drifts along with time, the microcontroller 9 automatically takes the test signal voltage value Vm after the countdown of 60s is finished as a confirmed measurement value; the microcontroller 9 simultaneously collects the gear number of the multiplying power switch 3 at the moment through the multiplying power switch gear sampling circuit 33, determines a corresponding multiplying power resistance value Rm and simultaneously determines that the current test voltage gear is 1V or 100V; the resistance value Rm is the resistance value obtained by measuring the resistors R16-R16 through a high-precision resistance meter and stored in the microcontroller 9; the microcontroller 9 simultaneously obtains a test voltage real-time detection value Vt through the test voltage sampling circuit 32;
(5) calculating the resistance value of the tested fiber sample: the microcontroller 9 calculates the correction value Vmc of the voltage value Vm of the test signal by adopting a formula (3), and then calculates the resistance value Rx of the tested fiber sample by adopting a formula (4):
Vmc＝(Vm－Vo)×Vi/Vf （3）
wherein Vo is the zero drift voltage value obtained in the step (1), vm is the test signal voltage value obtained in the step (4), and Vi is the full-calibration voltage correction value obtained in the step (2); vf is the ideal voltage value obtained in step (2);
Rx=Vmc×Rm/(Vt－Vmc) （4）
wherein Vt is a real-time voltage value currently detected by the test voltage sampling circuit 32, and Rm is a current multiplying factor resistance value;
(6) calculating the specific resistance value of the tested fiber sample: the microcontroller 9 calculates the specific resistance value of the sample according to the input parameters of the tested fiber sample and the calculated resistance value Rx of the tested fiber sample and the general formula of the specific resistance calculation, and sends the specific resistance value to the touch screen 8 for real-time display; the microcontroller 9 saves the resistance value Rx and the specific resistance value of the detected fiber sample detected this time;
(7) taking down the test box: the touch screen 8 prompts the discharge switch 2 to be placed in a discharge gear, and the discharge switch knob 2-1 is rotated to place the discharge switch 2 in the discharge gear; after the device automatically detects that the discharge switch 2 is arranged at a discharge gear through the discharge switch gear sampling circuit 21, the micro-controller 9 controls the sample compression member 7 to be separated from the test box 1, the test box 1 is taken down, and the fiber sample to be tested is taken out;
(8) repeating the steps (4) to (7), and testing the next 15g fiber sample until the test sample times required by the test are finished; the device automatically calculates and saves the test result and the statistic value thereof; the instrument automatic calculation and the statistical value reduction method thereof follow the newly published standard of the fiber specific resistance test method.
In the test process involved in the foregoing steps, the microcontroller 9 detects the applied test voltage in real time through the test voltage sampling circuit 32, and once an incorrect voltage value is detected, for example, when a low-resistance sample is selected as a 100V test voltage test by mistake, the microcontroller 9 immediately controls the power module 6 to cut off the test power, stops the test, and sends a warning prompt message to the tester through the touch screen 8.
In the production of the pointer analog fiber specific resistance instrument, in order to enable the multiplying factor resistance to reach the specified resistance value, several resistors are generally adopted to realize the series-parallel connection mode, and the stability of the resistance value is poor.
In this embodiment, the device can automated inspection discharge switch 2 place the electricity gear, when discharge switch 2 has placed the electricity gear, just can compress or release the operation to the fibre sample in the test box 1 to prevent that the fibre sample from compressing or releasing and producing static in the operation process, produce harmful effects to the device.
The above embodiments are illustrative of specific embodiments of the present invention, and are not meant to limit the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention to obtain corresponding equivalent technical solutions, therefore all equivalent technical solutions should fall into the scope of the present invention.
Claims (10)
1. A digital fiber specific resistance testing device comprises a box body, a testing box, a sample compression component and a circuit device; the circuit device comprises a high impedance amplifier and a high-precision A/D converter; the test box is used for accommodating a tested fiber sample and is arranged on the box body in a pluggable manner; the test box is provided with a first electrode plate and a second electrode plate; the method is characterized in that: the circuit device also comprises a discharge switch, a multiplying power switch, a power supply module, a touch screen, a microcontroller, a discharge switch gear sampling circuit, a series voltage division circuit, a power supply selection circuit, a test voltage sampling circuit, a multiplying power switch gear sampling circuit and a full scale correction voltage circuit; wherein:
a discharge switch for selecting a device to perform a calibration, discharge or test function; the discharge switch is respectively and electrically connected with the first electrode plate and the second electrode plate of the test box, the high impedance amplifier, the multiplying power switch, the discharge switch gear sampling circuit, the full scale correction voltage circuit and the microcontroller;
the multiplying power switch is used for selecting a test voltage, a test range and a multiplying power resistance gear, and is respectively and electrically connected with the discharge switch, the power supply module, the series voltage division circuit, the power supply selection circuit, the test voltage sampling circuit, the multiplying power switch gear sampling circuit and the microcontroller;
the high-impedance amplifier and the high-precision A/D converter are used for detecting and sending a sample detection voltage signal to the microcontroller; the high-impedance amplifier is connected with the high-precision A/D converter in series, and the input end of the high-impedance amplifier is electrically connected with the discharge switch; the output end of the high-precision A/D converter is electrically connected with the microcontroller;
the power supply module is used for providing power supply required by the test; the output power of the power supply module is controlled by the microcontroller;
the sample compression component is used for extruding the tested fiber sample under the control of the microcontroller during test and use so that the tested fiber sample is in close contact with the first electrode plate and the second electrode plate of the test box;
the touch screen is used for man-machine information interaction and is electrically connected with the two-way signal of the microcontroller;
the microcontroller is used for comprehensively controlling the operation of the device, calculating the specific resistance value and storing data;
the discharging switch gear sampling circuit is used for sending a signal to the microcontroller so that the microcontroller automatically judges whether the device is in a full calibration state, a discharging state or a testing state; the discharge switch gear sampling circuit is respectively electrically connected with the discharge switch and the microcontroller;
the series voltage division circuit is used for expanding the resistance measurement range of the tested fiber and is electrically connected with the multiplying power switch, and when the series voltage division circuit is used, the series voltage division circuit is connected with the tested fiber sample in series for voltage division;
the power supply selection circuit is used for selecting the voltage required by the test; the power supply selection circuit is respectively electrically connected with the multiplying power switch and the power supply module;
the test voltage sampling circuit is used for automatically detecting the current test voltage real-time value when in use; the test voltage sampling circuit is respectively electrically connected with the power supply selection circuit and the microcontroller;
the multiplying power switch gear sampling circuit is used for sampling and sending a range signal to the microcontroller; the multiplying power switch gear sampling circuit is respectively and electrically connected with the multiplying power switch and the microcontroller;
the full scale correction voltage circuit is used for providing a full scale correction voltage signal required by full scale of the device, and the input end of the full scale correction voltage circuit is electrically connected with the power supply module; the output end of the fullness correction voltage circuit is electrically connected with the discharge switch.
2. The digital fiber specific resistance testing device of claim 1, wherein: the discharge switch is a three-pole three-position rotary type wave band switch; the discharge switch is provided with a discharge switch knob, a first movable contact D21, a second movable contact D22 and a third movable contact D23 which coaxially and synchronously move under the drive of the discharge switch knob, 3 static contacts J211, J212 and J213 which are matched with the first movable contact D21, 3 static contacts J221, J222 and J223 which are matched with the second movable contact D22, and 3 static contacts J231, J232 and J233 which are matched with the third movable contact D23; the discharging switch knob is arranged on the box body.
3. The digital fiber specific resistance testing device of claim 2, wherein: the discharge switch gear sampling circuit comprises 5 resistors R1-R5; one end of the resistor R1 is grounded, and the other end of the resistor R1 is electrically connected with one end of the resistor R2 through a static contact J231 of the discharge switch; the other end of the resistor R2, one end of the resistor R3 and a static contact J232 of the discharge switch are collinear; the other end of the resistor R3, one end of the resistor R4 and a static contact J233 of the discharge switch are collinear; the other end of the resistor R4 and one end of the resistor R5 are provided with a common contact which is electrically connected with a DC3.3V power output end of the micro controller; the other end of the resistor R5 is connected with a third moving contact D23 of the discharge switch; and the third moving contact D23 of the discharge switch is electrically connected with a discharge switch gear sampling signal input end arranged on the microcontroller.
4. The digital fiber specific resistance testing device of claim 1, wherein: the multiplying power switch is a three-pole eleven-position rotary type waveband switch, and the multiplying power switch is provided with a multiplying power switch knob, a first moving contact D31, a second moving contact D32 and a third moving contact D33 which move coaxially and synchronously under the driving of the multiplying power switch knob; 11 static contacts J311-J3111 matched with the first moving contact D31, 11 static contacts J321-J3211 matched with the second moving contact D32, and 11 static contacts J331-J3311 matched with the third moving contact D33; the multiplying power switch knob is arranged on the box body;
the multiplying power switch is electrically connected with the discharge switch through a first moving contact D31 and a second moving contact D32.
5. The digital fiber specific resistance testing device of claim 4, wherein: the series voltage division circuit comprises 11 resistors R6-R16; one ends of the resistors R6-R16 are correspondingly and electrically connected with static contacts J311-J3111 of the multiplying power switch; the other ends of the resistors R6-R16 are grounded; when the fiber testing device is used for testing, the resistors R6-R16 are connected with a tested fiber sample in series according to the set gears for voltage division.
6. The digital fiber specific resistance testing device of claim 4, wherein: the power supply selection circuit consists of a second moving contact D32 of a multiplying power switch, 11 fixed contacts J321-J3211 matched with the second moving contact D, and a wire for connection; the static contact J321, the static contact J322 and the static contact J323 are connected in parallel through a conducting wire to form a common connection point, and the common connection point is a first power supply input end of the power supply selection circuit; 8 static contacts J324-J3211 are connected in parallel through a wire to form a common connection point, and the common connection point is a second power supply input end of the power supply selection circuit; the power supply selection circuit is electrically connected with the power supply module through the first power supply input end and the second power supply input end.
7. The digital fiber specific resistance testing device of claim 4, wherein: the multiplying power switch gear sampling circuit comprises 13 resistors R17-R29; one end of the resistor R17 is grounded, and the other end of the resistor R17 is connected in series with one end of the resistor R18 through a static contact J331 of the multiplying power switch; the resistors R18-R28 are connected in series in sequence; static contacts J332-J3311 of the multiplying power switch are electrically connected with the series connection points of every 2 adjacent resistors R18-R28 in sequence; the other end of the resistor R28 which is not connected in series and one end of the resistor R29 are provided with a common connection point, and the common connection point is connected with a DC3.3V power output end which is arranged on the micro-controller; the other end of the resistor R29 is electrically connected with a third moving contact D33 of the multiplying power switch; and a third moving contact D33 of the multiplying power switch is electrically connected with a sampling signal input end of a gear of the multiplying power switch, which is arranged on the microcontroller.
8. The digital fiber specific resistance testing device of claim 1, wherein: the sample compression component is an electric push rod or a pneumatic push rod.
9. A method for testing the specific resistance of a fiber according to the digital fiber specific resistance testing device of any one of claims 1 to 8, comprising the steps of:
(1) zero calibration of the device: switching on a power supply of the device for preheating, inputting the type of a fiber sample to be detected through a touch screen, and placing a discharge switch in a discharge gear according to the prompt of the touch screen after preheating is finished; after the discharge switch gear sampling circuit automatically detects that the discharge switch is arranged at a discharge gear, the input end of the high-impedance amplifier is grounded at the moment; the microcontroller collects and stores a zero drift voltage value Vo of the device caused by external induction voltage and circuit parameter change of the device through a high impedance amplifier and a high-precision A/D converter;
(2) the device is full: the method comprises the following steps that an electric switch is placed to a full-calibration gear for full calibration according to prompt of a touch screen, and after the full calibration is finished, a microcontroller calculates and stores an ideal voltage value Vf and a full-calibration voltage correction value Vi; placing an electric switch to a discharging gear according to the prompt of the touch screen;
(3) selecting a multiplying factor gear and a test voltage corresponding to the fiber sample: determining a corresponding multiplying power gear according to a fiber sample to be detected; setting the multiplying power switch in a set multiplying power gear; the required test voltage is selected synchronously;
(4) testing of fiber samples: putting a fiber sample to be tested into a test box and positioning the test box in place; sending a sample compression command to the micro controller through the touch screen, and compressing the fiber sample to a set position by a sample compression member; placing an electric switch to a test gear according to the prompt of the touch screen; the micro controller automatically starts 60 seconds of countdown; the power supply module applies preset test voltage to the test box; the high-impedance amplifier 4 detects a voltage value Vm of a test signal formed on a multiplying factor resistor connected with the multiplying factor switch, and the voltage value Vm is converted into a digital signal sending microcontroller by the high-precision A/D converter 5 after being amplified; the micro controller sends the voltage value Vm of the test signal to a touch screen for display; the microcontroller simultaneously collects the gear number of the multiplying power switch at the moment through the multiplying power switch gear sampling circuit and determines a prestored corresponding multiplying power resistance value Rm; simultaneously determining the current test voltage gear; the microcontroller simultaneously obtains a test voltage real-time detection value Vt through the test voltage sampling circuit;
(5) calculating the resistance value of the tested fiber sample: the microcontroller calculates the resistance Rx of the tested fiber sample by using the zero drift voltage value Vo, the ideal voltage value Vf, the full-correction voltage correction value Vi, the test signal voltage value Vm and the real-time voltage value Vt detected by the test voltage sampling circuit;
(6) calculating the specific resistance value of the tested fiber sample: the microcontroller calculates the specific resistance value of the sample according to the input parameters of the measured fiber sample and the calculated resistance value Rx of the measured fiber sample and a general formula for calculating the specific resistance, and sends the specific resistance value to the touch screen for real-time display; the microcontroller saves the resistance value Rx and the specific resistance value of the detected fiber sample detected this time;
(7) taking down the test box: placing an electric gear of the discharge switch according to the prompt of the touch screen; after the discharge switch gear sampling circuit automatically detects that the discharge switch is arranged at a discharge gear, the microcontroller controls the sample compression member to be separated from the test box, the test box is taken down, and the fiber sample to be tested at this time is taken out;
(8) and (5) repeating the steps (4) to (7), and testing the next fiber sample until the test sample times required by the test are finished.
10. The test method of claim 9, wherein: the method for device full calibration in the step (2) comprises the following steps:
firstly, calculating an ideal voltage value Vf: the microcontroller calculates the ideal voltage value Vf by adopting the formula (1):
Vf＝Rs×Vt/(Rm－Rs) （1）
wherein, vt is the actually measured test voltage value sent by the test voltage sampling circuit received by the microcontroller when the test device is fully checked, rs and Rm are resistance values which are preset by the microcontroller and can enable the test device to be fully checked, wherein Rs can be regarded as a sample resistance value, and Rm can be regarded as a multiplying factor resistance value;
and step two, calculating and storing a correction value of the full-voltage: the microcontroller calculates and stores a full-correction voltage correction value Vi by adopting a formula (2):
Vi＝Vf－(Va－Vo) （2）
in the formula, va is a voltage measured value of the multiplying factor resistor Rm obtained by the microcontroller through the high impedance amplifier and the high-precision a/D converter, vo is a zero drift voltage value obtained in the step (1), and Vf is an ideal voltage value obtained in the first step in the step;
in the step (4), the microcontroller selects the test signal voltage value Vm by adopting the following method:
if the voltage value Vm of the test signal displayed by the touch screen is basically stable and unchanged, prompting to confirm that the current value is the test value by the touch screen; if the test signal voltage value Vm drifts along with time, the microcontroller automatically takes the test signal voltage value Vm after the countdown of 60s is finished as a confirmed measured value;
in the step (5), the method for calculating the resistance value of the tested fiber sample by the microcontroller comprises the following steps:
firstly, calculating a correction value Vmc of a test signal voltage value Vm by adopting a formula (3):
Vmc＝(Vm－Vo)×Vi/Vf （3）
wherein Vo is the zero drift voltage value obtained in the step (1), vm is the test signal voltage value obtained in the step (4), and Vi is the full-calibration voltage correction value obtained in the step (2); vf is the ideal voltage value obtained in step (2);
the second step: and calculating the resistance value Rx of the tested fiber sample by adopting a formula (4):
Rx=Vmc×Rm/(Vt－Vmc) （4）
wherein Vt is a real-time voltage value currently detected by the test voltage sampling circuit, and Rm is a current multiplying factor resistance value.
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