CN106872842B - Potentiometer carbon sheet tester with resistance sorting and measuring functions and measuring method - Google Patents
Potentiometer carbon sheet tester with resistance sorting and measuring functions and measuring method Download PDFInfo
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- CN106872842B CN106872842B CN201710232143.9A CN201710232143A CN106872842B CN 106872842 B CN106872842 B CN 106872842B CN 201710232143 A CN201710232143 A CN 201710232143A CN 106872842 B CN106872842 B CN 106872842B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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Abstract
The invention discloses a potentiometer carbon sheet tester with a resistance sorting and measuring function and a measuring method, comprising a man-machine interaction module, a constant current source switching circuit, a reference voltage source, a linear power supply, a switching array and a needle bed test board; the man-machine interaction module comprises a liquid crystal display area, a power switch, a function selection switch, a key area, a mechanical clamp interface and a signal output port. The automatic intelligent detection mode is adopted to automatically, timely and accurately detect whether the resistance value of the resistor of the printed carbon sheet of the potentiometer is within the allowable error range, the measurement precision of the tester is high, the production and detection requirements of the potentiometer are met, and meanwhile, the cost of the tester is lower, so that the tester is applicable to actual production.
Description
Technical Field
The invention designs a potentiometer carbon sheet tester, and particularly relates to a potentiometer carbon sheet tester with a resistance sorting and measuring function and a measuring method.
Background
The potentiometer is an adjustable electronic element, and is composed of a resistor body and a rotating or sliding system, and is used for adjusting the voltage and the current, so that the potentiometer is quite wide in application. The resistor of the carbon film potentiometer is formed by coating ground carbon black, graphite, quartz and other materials on the surface of a substrate, and the carbon film potentiometer has the characteristics of simple manufacturing process, high resolution, good wear resistance, long service life and the like, and is the potentiometer most widely applied at present.
The production of the carbon film potentiometer requires printing, detecting and cutting the carbon sheet. The detection of carbon flakes has been a problem. The traditional detection method is to measure the resistance of the printed carbon sheet by manual sampling and detect whether the center tap is short-circuited with the carbon sheet by utilizing human eyes. The detection method has poor accuracy and extremely low efficiency, and can reach the qualification rate of more than 90 percent, but still can not ensure complete qualification, and the rejection rate of subsequent products can be increased. Therefore, development of a novel efficient and economical detection method for reducing the manufacturing cost of the potentiometer and improving the production efficiency is urgently needed.
In recent years, some novel detection devices formed by using traditional analog switches appear on the market, so that the automation of carbon sheet detection is realized, and the efficiency is higher. However, factors such as insufficient internal resistance and leakage current of the analog switch cause larger errors in the low-resistance and high-resistance measuring range, and the precision requirement of the potentiometer cannot be met. At present, although some manufacturers produce high-speed and high-precision detection instruments, the price of the detection instruments is too high to meet the requirement of economy.
The production of the potentiometer carbon plate is 200 paths of printing by visiting a factory. At present, two methods for detecting the qualification of the potentiometer carbon plate generally exist in China, one method is to detect the potentiometer carbon plate through a purchased imported machine, but the imported machine is high in price, the effect is not very good, and the speed is low. The other mode is to adopt manual sampling inspection to detect potentiometer carbon plates at four corners of the 200 paths of potentiometer carbon plate, and if the four potentiometer carbon plates are qualified, the 200 potentiometer carbon plates on the whole potentiometer carbon plate are considered to be qualified, and the method can generally ensure the qualification rate of more than 90 percent, but some unqualified products caused by printing problems in the middle cannot be detected. If the purchasing company has high requirements on the qualification rate of the carbon sheets, the producer can only detect each resistor carbon sheet manually at the moment, which is time-consuming and labor-consuming.
Disclosure of Invention
The invention aims to: aiming at the problems, the invention provides a potentiometer carbon sheet tester with a resistance sorting and measuring function and a measuring method.
The technical scheme is as follows: in order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a potentiometer carbon sheet tester with a resistance sorting and measuring function comprises a man-machine interaction module, a constant current source switching circuit, a reference voltage source, a linear power supply, a switching array and a needle bed test board; wherein, the liquid crystal display device comprises a liquid crystal display device,
the man-machine interaction module comprises a liquid crystal display area, a power switch, a function selection switch, a key area, a mechanical clamp interface and a signal output port. The display content of the liquid crystal display area comprises a current working state, a set resistance value unit, a positive and negative error range, a detection state, a disqualified path and a measured value. The key area includes a confirm key, a return key, a left and right key, an up and down key, a unit key, and a calibration key.
The constant current source is composed of a differential amplifier and a feedback operational amplifier; the constant current source switching circuit adopts an electromagnetic relay to realize gear switching; the reference voltage source circuit adopts a reference voltage source chip; the linear power supply circuit comprises a power frequency linear transformer, a first linear voltage stabilizing device, a second linear voltage stabilizing device, a third linear voltage stabilizing device, a fourth linear voltage stabilizing device and an inductor; the switching array is a 200-way switching array; the needle bed test board comprises a switching array output test end and a positioning hole.
The method for detecting the potentiometer carbon plate by using the potentiometer carbon plate tester with the resistance sorting and measuring functions comprises the following specific operation flow:
(1) Turning on a power switch, and selecting a working mode by a function selection switch;
(2) Pressing a determination key, setting the resistance value of the measured carbon sheet, wherein the setting range of the resistance value is 000-999, and the set value is displayed in a set resistance value column on a liquid crystal display screen;
(3) Pressing the determining key once again, setting a unit of the resistance value, wherein three gears can be selected from omega, KΩ or MΩ, and switching the unit through the unit key;
(4) Pressing a determination key once again, setting a forward allowable error of the measured carbon sheet, and displaying the set value by a forward error range column on the liquid crystal display screen;
(5) Pressing a determination key once again, setting the negative allowable error of the measured carbon plate, and displaying the set value by a negative error range column on the liquid crystal display screen;
(6) In the setting process, when the previous item is to be reset, pressing a return key;
(7) Placing 200 paths of potentiometer carbon plates to be tested into a needle bed test plate of the equipment, aligning the positioning holes, pressing a determination key once again, starting the device, and automatically scanning the carbon plates in multiple paths;
(8) If all 200 paths of carbon sheets are qualified, a detection status bar on the liquid crystal display screen displays the qualification, a measurement value bar displays the resistance value of the detected carbon sheets, and a signal output port gives a qualification signal; if any one of the 200 paths is unqualified, the detection status bar on the liquid crystal display screen displays unqualified path values, and the unqualified path bar displays unqualified path values.
The method for carrying out resistance sorting measurement by using the potentiometer carbon sheet tester with the resistance sorting measurement function comprises the following specific operation flow:
(1) Turning on a power switch, and selecting a working mode by a function selection switch;
(2) The measuring instrument is connected with the mechanical arms through the mechanical clamp, the two mechanical arms are in short circuit before measurement, the calibration key is pressed down, the instrument automatically performs internal zero-resetting calibration, and the mechanical clamp, the mechanical arms and the circuit resistance are removed;
(3) Pressing a determining key at one time, setting the resistance value of the resistor to be selected, wherein the setting range of the resistance value is 000-999, and the setting value is displayed in a setting resistance value column on a liquid crystal display screen;
(4) Pressing the determining key once again, setting a unit of the resistance value, wherein three gears can be selected from omega, KΩ or MΩ, and switching the unit through the unit key;
(5) Pressing the determination key once again, setting the forward allowable error of the resistor to be sorted, and displaying the set value by a forward error range column on the liquid crystal display screen;
(6) Pressing a determination key once again, setting a negative allowable error of the resistor to be sorted, and displaying the set value by a negative error range column on the liquid crystal display screen;
(7) In the setting process, when the previous item is to be reset, pressing a return key;
(8) After the setting is finished, the mechanical arm contacts the resistor, the resistor is measured and sorted, and the resistor meeting the setting requirement is measured;
(9) When the resistance contacted by the manipulator is lower than the set range, the detection status bar displays negative ultrasonic, and the manipulator puts the resistance into a disqualified box; when the resistance contacted by the manipulator is higher than the set range, the detection status bar displays positive and excessive, and the manipulator puts the resistance into a disqualified box; when the resistance contacted by the manipulator is in the set range, the detection status bar displays qualified, meanwhile, the buzzer sounds for a long time, and the manipulator puts the resistance into the qualified box.
The beneficial effects are that: the invention adopts an automatic intelligent detection mode to automatically, timely and accurately detect whether the resistance of the resistor of the printed carbon sheet of the potentiometer is within the allowable error range, the allowable potential difference of the carbon sheet of the potentiometer is generally +/-20%, and simultaneously detect whether the center tap soldering lug of the carbon sheet is short-circuited with the resistor of the carbon sheet. The tester has high measurement precision, meets the production and detection requirements of the potentiometer, has lower cost and is applicable to actual production.
The invention adds the resistance sorting measurement function on the basis of the potentiometer carbon sheet tester, ensures that the resistance sorting measurement instrument has the advantages of low cost, high precision and wide measurement range, can rapidly sort the resistance, has the measurement speed of about 60 times per second, completely meets the requirement of a production line, has the precision of more than a few thousandths, and completely meets the production measurement of the common carbon film resistance and the metal film resistance with the precision of one percent.
Drawings
FIG. 1 is a workflow diagram of the present invention;
FIG. 2 is a schematic diagram of a human-machine interaction module;
FIG. 3 is a circuit diagram of a constant current source;
fig. 4 is a constant current source switching circuit diagram;
FIG. 5 is a reference voltage source circuit diagram;
FIG. 6 is a circuit diagram of a linear power supply;
FIG. 7 is a schematic diagram of a switching array;
fig. 8 is a schematic view of a needle bed test plate.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
The invention relates to a potentiometer carbon sheet tester with high precision, high speed and low cost, which adopts an automatic intelligent detection mode to automatically, timely and accurately detect whether the resistance value of a resistor of a printed carbon sheet of a potentiometer is within an allowable error range, wherein the allowable potential difference of the potentiometer carbon sheet is generally +/-20%, and simultaneously detect whether a center tap soldering lug of the carbon sheet is short-circuited with the resistor of the carbon sheet. The tester has high measurement precision, meets the production and detection requirements of the potentiometer, has lower cost and is applicable to actual production.
The invention adds the resistance sorting measurement function on the basis of the potentiometer carbon sheet tester, ensures that the resistance sorting measurement instrument has the advantages of low cost, high precision and wide measurement range, can rapidly sort the resistance, has the measurement speed of about 60 times per second, completely meets the requirement of a production line, has the precision of more than a few thousandths, and completely meets the production measurement of the common carbon film resistance and the metal film resistance with the precision of one percent.
The hardware part of the potentiometer carbon sheet tester with the resistance sorting and measuring function comprises a man-machine interaction module, a constant current source, a reference voltage source, a linear power supply, a switching array and a needle bed test board; the workflow is shown in figure 1.
Fig. 2 shows a man-machine interaction module of the potentiometer carbon plate tester with the resistance sorting measurement function, which comprises a liquid crystal display area, a power switch, a function selection switch, a key area, a mechanical clamp interface and a signal output port.
The specific display content of the liquid crystal display area comprises:
(1) The current working state is displayed to be working under the first function or the second function;
(2) Setting a resistance value and displaying a numerical value in a range of 000-999;
(3) Setting a resistance unit, and displaying omega, kΩ or MΩ;
(4) Displaying the numerical value in the range of 00-99 in the positive and negative error ranges;
(5) Detecting the state, wherein the first mode of the function shows qualification or disqualification, and the second mode of the function shows negative super, positive super or qualification;
(6) Under the function one working mode, when the disqualified path appears on the carbon sheet, the path value in the range of 001-200 is displayed;
(7) The measured value shows the resistance value of the carbon sheet or the resistance value of the resistor, and the measured value is four digits in total, the first three digits show the numerical value, and the last digit shows the unit.
The power switch is used for controlling whether the measuring instrument is powered on or not, and after the switch is turned on, the instrument works, and the liquid crystal display screen is on. Function selection switch: when the switch 1 is pressed down, the function I is entered into a working state, and the current working state on the liquid crystal displays the function I; when the switch 2 is pressed down, the second function operating state is entered, and the second function is displayed in the current operating state on the liquid crystal.
The key area specifically comprises:
(1) Determining a key: determining that the operation of the current setting item is completed;
(2) And (3) a return key: returning to the last setting item of the operation and resetting;
(3) Left and right keys: selecting a current setting bit when setting the set resistance value and the positive and negative error range;
(4) And (3) key up: adding 1 to the selected set bit value, wherein the value is 0 to 9 cycles, and the value is not carried or borrowed;
(5) And (3) key pressing: subtracting 1 from the selected set bit value, wherein the value is 0 to 9 cycles, and the set bit value is not carried or borrowed;
(6) Unit key: setting a unit, and circularly displaying options in omega, komega or M omega;
(7) Calibration key: the method is used for zero setting calibration before resistance sorting measurement.
The mechanical clamp interface is used for being connected with a mechanical clamp, and the measuring instrument can be connected with the mechanical hand through the mechanical clamp. The signal output port is arranged at the back of the measuring instrument and is used for being connected with external equipment or a power amplifier, the expansion performance of the instrument is improved, and the instrument gives different signals according to the detection status bar.
The functional operation flow of the potentiometer carbon sheet tester with the resistance sorting and measuring functions is specifically as follows:
the operation flow of the carbon sheet detection of the potentiometer is as follows:
(1) After the power switch is turned on, the switch 1 is pressed down to enter a function one working mode;
(2) Pressing a determination key to set the resistance value to be set of the measured carbon sheet, wherein the setting range of the resistance value is 000-999, and the set value is displayed in a set resistance value column on the liquid crystal display screen;
(3) The determination key is pressed once again, the unit of the resistance value just set is set, three gears can be selected from omega, KΩ or MΩ, and unit switching is carried out through the unit key;
(4) Pressing a determination key again to set the forward allowable error of the measured carbon sheet, wherein the set value is displayed by a forward error range column on the liquid crystal display screen;
(5) Pressing a determination key again to set the negative allowable error of the measured carbon sheet, wherein the set value is displayed by a negative error range column on the liquid crystal display screen;
(6) In the setting process, when the previous item is to be reset, pressing a return key;
(7) The method comprises the steps that a user places 200 paths of potentiometer carbon plate plates to be tested on a needle bed test plate in equipment, aligns positioning holes, presses a determination key once again, starts pneumatic pressing equipment, automatically scans the carbon plate in multiple paths, detects whether resistance values of resistors of all paths of carbon plates of the potentiometer carbon plate are within a set allowable error range, and detects whether center tap welding plates of all paths of carbon plates are short-circuited with the resistors of the carbon plates;
(8) If all 200 paths of carbon sheets are qualified, a detection status bar on the liquid crystal display screen displays the qualification, a measurement value bar displays the resistance value of the detected carbon sheets, and a signal output port gives a qualification signal; if any one of the 200 paths is failed, the detection status bar on the liquid crystal display screen displays failed paths, and meanwhile, the failed paths bar displays failed path values, and if a plurality of failed paths exist, the path values are displayed in a circulating mode. The inspection worker can inspect and repair the carbon sheet according to the displayed disqualified path value.
The operation flow of the resistance sorting measurement of the functional two traditional carbon film metal film is as follows:
(1) After the power switch is turned on, the switch 2 is pressed down to enter a second functional working mode;
(2) According to the production requirement, the measuring instrument is provided with a mechanical clamp interface for being connected with mechanical clamps, the measuring instrument can be connected with mechanical arms through the mechanical clamps, the two mechanical arms are required to be in short circuit before measurement in order to improve the measurement precision, a calibration key is pressed down, the instrument automatically performs internal zero-resetting calibration, and the mechanical clamps, the mechanical arms and the circuit resistance are removed;
(3) Then pressing a determining key for one time to set the resistance value of the resistor to be selected, wherein the set range of the resistance value is 000 to 999, and the set value is displayed in a set resistance value column on the liquid crystal display screen;
(4) The determination key is pressed once again, the unit of the resistance value just set is set, three gears can be selected from omega, KΩ or MΩ, and unit switching is carried out through the unit key;
(5) Pressing a determination key once again to set the forward allowable error of the resistor to be sorted, wherein the set value is displayed by a forward error range column on the liquid crystal display screen;
(6) Pressing a determination key again to set the negative allowable error of the resistor to be sorted, wherein the set value is displayed by a negative error range column on the liquid crystal display screen;
(7) In the setting process, when the previous item is to be reset, pressing a return key;
(8) After the setting is finished, the mechanical arm contacts the resistor, the resistor is measured and sorted, and the resistor meeting the setting requirement is measured;
(9) When the resistance contacted by the manipulator is lower than the set range, the detection status bar displays negative ultrasonic, and the manipulator puts the resistance into a disqualified box; when the resistance contacted by the manipulator is higher than the set range, the detection status bar displays positive and excessive, and the manipulator puts the resistance into a disqualified box; when the resistance contacted by the mechanical arm is in a set range, the detection status bar displays qualification, and meanwhile, the buzzer sounds for a long time, and the mechanical arm places the resistance into a qualification box;
(10) In the three states, the measured value on the liquid crystal display can display the current contact resistance value in real time for manual monitoring. And meanwhile, in each state, the signal output port can also output different signals to the outside according to the detection state column for the external expansion equipment to receive.
A constant current source circuit diagram is shown in fig. 3. The constant current source is composed of a differential amplifier A1 and a feedback operational amplifier A2, the differential amplifier selects INA105, and the feedback operational amplifier selects OP07. Reference voltage V REF Applied to the non-inverting input terminal, V, of the differential amplifier INA105 REF The voltage control load R1 outputs an amount of current Io of 2.5V, and the inverting input terminal of the differential amplifier INA105 is directly grounded. The voltage on R1 is the input voltage V REF A constant load current Io is generated.
The resistance value of the resistor is divided into six steps, and the six steps correspond to six constant current sources: 25mA, 2.5mA, 250uA, 25uA, 2.5uA, 250nA, and switching by gear position. The constant current source belongs to a small current converter, and when high current output, such as 25mA, is needed, a triode is needed to realize current expansion.
As shown in fig. 4, a constant current source switching circuit diagram is shown, and gear switching is realized by using an electromagnetic Relay (Relay). Since the resistor gear is provided with two gears of 100KΩ -1 MΩ and 1MΩ -100 MΩ, constant current sources of 2.5uA and 250nA are correspondingly required. Under the condition of micro-current, if a semiconductor switching device is used for realizing gear switching, the problem of leakage exists, the testing precision is affected, and therefore, an electromagnetic relay is adopted for realizing gear switching.
As shown in fig. 5, the reference voltage source circuit diagram adopts the reference voltage source chip ADR441, which solves the temperature drift problem and well ensures the precision.
The linear power supply circuit diagram shown in fig. 6 comprises a conventional power frequency linear transformer, a first linear voltage stabilizing device A3, a second linear voltage stabilizing device A4, a third linear voltage stabilizing device A5 and a fourth linear voltage stabilizing device A6, wherein the first linear voltage stabilizing device A3 is selected from L7812, the second linear voltage stabilizing device A4 is selected from L7912, the third linear voltage stabilizing device A5 is selected from L7805, the fourth linear voltage stabilizing device A6 is selected from LM1117-3.3V, and an inductor L1 is used for isolating analog ground from digital ground. The linear power supply reduces ripple and does not introduce noise.
Fig. 7 is a schematic diagram of a switching array, which is a 200-way switching array. In actual production, the allowable error of the potentiometer carbon plate is generally +/-20%, and the allowable error of a better product is +/-10%, so that the precision of the potentiometer carbon plate is not required to reach 0.1% like the precision of a carbon film metal film resistor, and the precision of 1% is enough. Therefore, the design of the multi-path switching array does not need to consider the leakage current problem like the design of a constant current source switching circuit, the semiconductor switching device can be utilized for on-off control, the CJ2302N channel MOS field effect transistor with low leakage current is selected at the high end of the carbon sheet to be tested, and when a certain path of carbon sheet is required to be detected, the path of switching device is conducted, and the carbon sheet is tested through the constant current source. When the device automatically detects the carbon sheet plates, all the switch devices are sequentially conducted, so that all the carbon sheets are sequentially detected.
Fig. 8 is a schematic diagram of a needle bed test board, including switching array output test ends and positioning holes, when carbon sheet detection is performed, the carbon sheet board is aligned to the positioning holes, and each path of carbon sheet on the needle bed test board is automatically connected to the test ends for carbon sheet test.
The invention has multiple functions, can realize the quality detection of the carbon sheet of the potentiometer, can realize the sorting measurement of the carbon film metal film resistor, has high flexibility and greatly saves the investment of instruments and equipment of factories.
Claims (6)
1. The application method of the potentiometer carbon sheet tester with the resistance sorting and measuring functions is characterized by comprising the following steps of: the potentiometer carbon sheet tester with the resistance sorting and measuring functions comprises a man-machine interaction module, a constant current source switching circuit, a reference voltage source, a linear power supply, a switching array and a needle bed test board;
the using method comprises the following steps of detecting the carbon sheet of the potentiometer by using a carbon sheet potentiometer tester with a resistance sorting and measuring function:
(1) Turning on a power switch, and selecting a working mode by a function selection switch;
(2) Pressing a determination key, setting the resistance value of the measured carbon sheet, wherein the setting range of the resistance value is 000-999, and the set value is displayed in a set resistance value column on a liquid crystal display screen;
(3) Pressing the determining key once again, setting a unit of the resistance value, wherein three gears can be selected from omega, KΩ or MΩ, and switching the unit through the unit key;
(4) Pressing a determination key once again, setting a forward allowable error of the measured carbon sheet, and displaying the set value by a forward error range column on the liquid crystal display screen;
(5) Pressing a determination key once again, setting the negative allowable error of the measured carbon plate, and displaying the set value by a negative error range column on a liquid crystal display interface;
(6) In the setting process, when the previous item is to be reset, pressing a return key;
(7) Placing 200 paths of potentiometer carbon plates to be tested into a needle bed test plate of the equipment, aligning the positioning holes, pressing a determination key once again, starting the device, and automatically scanning the carbon plates in multiple paths;
(8) If all 200 paths of carbon sheets are qualified, the detection status bar on the liquid product display screen is qualified, the resistance value of the carbon sheet detected by the inner part but the kernel is sub-small is detected, and a qualified signal is given out from the signal output port; if any one of the 200 paths is unqualified, the detection status bar on the liquid crystal display screen displays unqualified path values, and the unqualified path bar displays unqualified path values.
2. The potentiometer carbon plate tester with resistance sorting and measuring functions according to claim 1, wherein: the man-machine interaction module comprises a liquid crystal display area, a power switch, a function selection switch, a key area, a mechanical clamp interface and a signal output port.
3. The potentiometer carbon plate tester with resistance sorting and measuring functions according to claim 2, wherein: the display content of the liquid crystal display area comprises a current working state, a set resistance value unit, a positive and negative error range, a detection state, a disqualified path and a measured value.
4. The potentiometer carbon plate tester with resistance sorting and measuring functions according to claim 2, wherein: the key area includes a confirm key, a return key, a left and right key, an up and down key, a unit key, and a calibration key.
5. The potentiometer carbon plate tester with resistance sorting and measuring functions according to claim 1, wherein: the constant current source is composed of a differential amplifier and a feedback operational amplifier; the constant current source switching circuit adopts an electromagnetic relay to realize gear switching; the reference voltage source circuit adopts a reference voltage source chip; the linear power supply circuit comprises a power frequency linear transformer, a first linear voltage stabilizing device, a second linear voltage stabilizing device, a third linear voltage stabilizing device, a fourth linear voltage stabilizing device and an inductor; the switching array is a 200-way switching array; the needle bed test board comprises a switching array output test end and a positioning hole.
6. The method for carrying out resistance sorting measurement by using the potentiometer carbon plate tester with the resistance sorting measurement function as claimed in claim 1, which is characterized in that: the specific operation flow is as follows:
(1) Turning on a power switch, and selecting a working mode by a function selection switch;
(2) The measuring instrument is connected with the mechanical arms through the mechanical clamp, the two mechanical arms are in short circuit before measurement, the calibration key is pressed down, the instrument automatically performs internal zero-resetting calibration, and the mechanical clamp, the mechanical arms and the circuit resistance are removed;
(3) Pressing a determining key at one time, setting the resistance value of the resistor to be selected, wherein the setting range of the resistance value is 000-999, and the set value is displayed in a set resistance value column on a liquid display screen;
(4) Pressing the determining key once again, setting a unit of the resistance value, wherein three gears can be selected from omega, KΩ or MΩ, and switching the unit through the unit key;
(5) Pressing the determination key once again, setting the forward allowable error of the resistor to be sorted, and displaying the set value by a forward error range column on the liquid crystal display screen;
(6) Pressing a determination key once again, setting a negative allowable error of the resistor to be sorted, and displaying the set value by a negative error range column on a liquid product display screen;
(7) In the setting process, when the previous item is to be reset, pressing a return key;
(8) After the setting is finished, the mechanical arm contacts the resistor, the resistor is measured and sorted, and the resistor meeting the setting requirement is measured;
(9) When the resistance contacted by the manipulator is lower than the set range, the detection status bar displays negative ultrasonic, and the manipulator puts the resistance into a disqualified box; when the resistance contacted by the manipulator is higher than the set range, the detection status bar displays positive and excessive, and the manipulator puts the resistance into a disqualified box; when the resistance contacted by the mechanical arm is in the set range, the detection status bar displays qualification, and meanwhile, the buzzer sounds for a long time, and the mechanical arm places the resistance into a qualification box.
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