CN206479601U - The potentiometer carbon plate tester of measurement function is sorted with resistance - Google Patents
The potentiometer carbon plate tester of measurement function is sorted with resistance Download PDFInfo
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- CN206479601U CN206479601U CN201720373147.4U CN201720373147U CN206479601U CN 206479601 U CN206479601 U CN 206479601U CN 201720373147 U CN201720373147 U CN 201720373147U CN 206479601 U CN206479601 U CN 206479601U
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Abstract
The utility model discloses a kind of potentiometer carbon plate tester that measurement function is sorted with resistance, including human-computer interaction module, constant-current source, constant-current source switching circuit, reference voltage source, linear power supply, switching array and needle-bar test board；Human-computer interaction module includes liquid crystal display area, power switch, functional select switch, key zone, mechanical clamp interface and signal output.Using automatic intelligent detection mode, timely and accurately detection potentiometer prints carbon plate resistive element resistance whether in the range of allowable error automatically, the tester measurement accuracy is high, potentiometer production detection demand is met, while measuring instrument cost is relatively low, actual production is applicable to.
Description
Technical field
The utility model is related to a kind of potentiometer carbon plate tester, more particularly to a kind of sorted with resistance measures function
Potentiometer carbon plate tester.
Background technology
Potentiometer is a kind of adjustable electronic component, is rotated by a resistive element and one or sliding system is constituted, be used for
The size of voltage and current is adjusted, purposes is quite varied.The resistive element of carbon-film potentiometer is to use the carbon black by grinding, graphite,
The materials such as quartz are coated on matrix surface and formed, and carbon-film potentiometer manufacture craft is simple, high with definition, and wearability is good, the longevity
The features such as life is longer, is current most widely used potentiometer.
The production of carbon-film potentiometer needs to print carbon plate, detected and cut.All the time, the detection of carbon plate is all
One problem.Traditional detection method is to print carbon plate resistance by artificial sampling measurement, and utilizes human eye detection centre cap
It is whether short-circuit with carbon plate.This detection method degree of accuracy is poor, extremely inefficient, although can reach more than 90% qualification rate, but
Be there is no guarantee that completely it is qualified, the percent defective of subsequent product can be increased.Thus, it is badly in need of research and development at present a kind of efficiently, economical
Novel detection method, the cost of manufacture to reduce potentiometer, improve production efficiency.
In recent years, in the market occurs in that some switch the new detection device constituted using traditional analog, realizes carbon plate
Detection automation, efficiency is higher.However, the factor such as analog switch internal resistance, leakage current deficiency causes it in low-resistance and high resistance measurement
In the range of error it is larger, it is impossible to meet the required precision of potentiometer.Although some current manufacturer productions have gone out high-speed, high precision
Detecting instrument, but its price is prohibitively expensive, it is impossible to meet the requirement of economy.
By visiting factory, production potentiometer carbon plate Dou Shi 200 prints on tunnel together.It is domestic current to potentiometer carbon plate
Qualified detection method typically have two kinds, a kind of detected by the import machine of purchase, but import machine is expensive,
Effect is nor very good, and speed is slow.Also a kind of mode is exactly using artificial sampling observation, to No. 200 potentiometer carbon plate plates
Four corners on potentiometer carbon plate detected, if this four are qualified, be considered as on whole potentiometer carbon plate plate 200
Potentiometer carbon plate is qualified, and this method can typically ensure more than 90% qualification rate, but it is middle some due to printing issues
Caused defective work can not be detected.If it is high for carbon plate yield requirement to buy business, manufacturer can only now pass through
Manually each resistor carbon plate is detected, wasted time and energy.
Utility model content
Goal of the invention：For problem above, the utility model proposes a kind of potentiometer that measurement function is sorted with resistance
Carbon plate tester.
Technical scheme：To realize above-mentioned purpose of design, the technical scheme that the utility model is used is：One kind has resistance
The potentiometer carbon plate tester of sorting measurement function, including human-computer interaction module, constant-current source, constant-current source switching circuit, benchmark electricity
Potential source, linear power supply, switching array and needle-bar test board.
Human-computer interaction module includes liquid crystal display area, power switch, functional select switch, key zone, mechanical clamp interface
And signal output.The display content in liquid crystal display area includes current operating state, setting resistance, setting resistance unit, positive and negative
To error range, detection state, unqualified path and measured value.Key zone include determine button, return button, right and left key, on
Lower key, unit button and calibration button.
Constant-current source is made up of differential amplifier and feedback operational amplifier；Constant-current source switching circuit is real using electromagnetic relay
Existing gear switch；Reference voltage source circuit uses reference voltage source chip；Linear power source circuit includes power frequency linear transformer, the
One linear voltage stabilization device, the second linear voltage stabilization device, third linear voltage-stabilizing device, the 4th linear voltage stabilization device and inductance；Switching
Array is that 200 tunnels switch array；Needle-bar test board includes switching array output test lead and positioning hole.
Beneficial effect：The utility model is using the timely and accurately detection potentiometer printing automatically of automatic intelligent detection mode
Whether carbon plate resistive element resistance is in the range of allowable error, and the permission potential difference of potentiometer carbon plate is generally ± 20%, detects simultaneously
Whether carbon plate centre cap weld tabs is short-circuit with carbon plate resistive element.The tester measurement accuracy is high, meets potentiometer production detection need
Ask, while measuring instrument cost is relatively low, be applicable to actual production.
The utility model is additionally arranged resistance sorting measurement function on the basis of potentiometer carbon plate tester, it is ensured that resistance point
Select measuring instrument to have cost low, precision is high, the wide advantage of measurement range, sorting resistance can be measured at a high speed, measuring speed is up to every
Second plants 60 times or so, fully meets production line demand, precision is very high, can reach in some thousandths of, can meet general completely
The production measurement of logical fixed carbon resister and the centesimal metalfilmresistor of precision.
Brief description of the drawings
Fig. 1 is the workflow diagram of the present invention；
Fig. 2 is human-computer interaction module schematic diagram；
Fig. 3 is constant-current source circuit figure；
Fig. 4 is constant-current source switching circuit figure；
Fig. 5 is reference voltage source circuit figure；
Fig. 6 is linear power source circuit figure；
Fig. 7 is switching array schematic diagram；
Fig. 8 is needle-bar test board schematic diagram.
Embodiment
The technical solution of the utility model is further described with reference to the accompanying drawings and examples.
The utility model is a high accuracy, high speed, the potentiometer carbon plate tester of low cost, using automatic intelligent
Automatically timely and accurately detection potentiometer prints carbon plate resistive element resistance whether in the range of allowable error to detection mode, potentiometer
The permission potential difference of carbon plate is generally ± 20%, while detecting whether carbon plate centre cap weld tabs is short-circuit with carbon plate resistive element.The survey
Try instrument measurement accuracy high, meet potentiometer production detection demand, while measuring instrument cost is relatively low, be applicable to actual production.
The utility model is additionally arranged resistance sorting measurement function on the basis of potentiometer carbon plate tester, it is ensured that resistance point
Select measuring instrument to have cost low, precision is high, the wide advantage of measurement range, sorting resistance can be measured at a high speed, measuring speed is up to every
Second plants 60 times or so, fully meets production line demand, precision is very high, can reach in some thousandths of, can meet general completely
The production measurement of logical fixed carbon resister and the centesimal metalfilmresistor of precision.
The hardware components of the potentiometer carbon plate tester described in the utility model that measurement function is sorted with resistance include
Human-computer interaction module, constant-current source, reference voltage source, linear power supply, switching array and needle-bar test board；Its workflow such as Fig. 1
It is shown.
It is the people of the potentiometer carbon plate tester described in the utility model that measurement function is sorted with resistance as shown in Figure 2
Machine interactive module, including liquid crystal display area, power switch, functional select switch, key zone, mechanical clamp interface and signal output
Mouthful.
The content that is particularly shown in liquid crystal display area contains：
(1) current operating state, display work at present is under function one or function two；
(2) numerical value in the range of resistance, display 000-999 is set；
(3) resistance unit, display Ω, K Ω or M Ω are set；
(4) it is positive and negative to error range, show numerical value in the range of 00-99；
(5) detect state, show under the pattern of function one shown under acceptance or rejection, function two modes it is negative super, positive excess or
It is qualified；
(6) unqualified path, under the mode of operation of function one, when unqualified path occurs in carbon plate plate, shows 001-200
In the range of path values；
(7) measured value, display carbon plate resistance or resistance, totally four, front three shows numerical value, and latter position display is single
Position.
Power switch is used to control whether measuring instrument switches on power, and opens after switch, instrument enters work, LCDs
It is bright.Functional select switch：When switching 1 and pressing, the working condition of entered function one, current work state display function on liquid crystal
One；When switching 2 and pressing, the working condition of entered function two, current work state display function two on liquid crystal.
Key zone is specifically included：
(1) button is determined：It is determined that completing current setting item operation；
(2) button is returned：The last setting item of operation is returned, is reset；
(3) left-right key：To setting resistance and it is positive and negative set to error range when, selection currently set position；
(4) key on：Carry out Jia 1 processing to selected setting bit value, numerical value is 0 to 9 to circulate, not-carry, do not borrow；
(5) lower key：Carry out subtracting 1 processing to selected setting bit value, numerical value is 0 to 9 circulations, not-carry, do not borrow；
(6) unit button：Unit is set, options is in Ω, K Ω or " M Ω interior circulations are shown；
(7) button is calibrated：The zero calibration before measurement is sorted for resistance.
Mechanical clamp interface is used to access mechanical clamp, and measuring instrument can connect manipulator by mechanical clamp.Signal output
Mouth is at measuring instrument back, for connecing external equipment or power amplifier, increases the scalability of instrument, and instrument is given according to detection status bar
Go out unlike signal.
The feature operation flow of the potentiometer carbon plate tester of the present invention that measurement function is sorted with resistance is specific
For：
The potentiometer carbon plate of function one detection operating process be：
(1) after power switch is opened, the switch mode of operation of 1 entered function one is pressed；
(2) by button is determined, need the resistance set to set institute carbon determination piece, resistance setting range for 000 to
999, setting resistance column of the setting value on LCDs is shown；
(3) again by button is once determined, the unit to set resistance just now is set, have optional Ω, K Ω of third gear or
M Ω, unit switching is carried out by unit button；
(4) the positive allowable error of institute's carbon determination piece is set, setting value is by liquid crystal display by button is once determined again
Positive error scope column on screen is shown；
(5) the negative sense allowable error of institute's carbon determination piece is set, setting value is by liquid crystal display by button is once determined again
Negative sense error range column on screen is shown；
(6) during being set more than, when the next item up to be reset, by return button；
(7) No. 200 potentiometer carbon plate plates for needing to test are put on the needle-bar test board in equipment by user, alignment positioning
Hole, then by button is once determined, device starts pneumatic presses, and automatic multi-path scanning carbon plate plate detects potentiometer carbon plate plate
Whether the resistive element resistance of each road carbon plate is in the range of the allowable error of setting, while detecting the centre cap weld tabs of each road carbon plate
Whether with the short circuit of the resistive element of carbon plate；
(8) detect that status bar shows qualified if 200 road carbon plates are all qualified, on LCDs, measured value column shows institute
The resistance of carbon determination piece, signal output provides qualifying signal；If any road is unqualified in 200 tunnels, shape is detected on LCDs
State column shows unqualified, while unqualified path column shows underproof path values, if there is multiple unqualified paths, circulation is aobvious
Show these path values.Detection workman can be checked carbon plate plate according to the unqualified path values of display, repaired.
The traditional carbon film metalfilmresistor of function two sorts the operating process measured and is：
(1) after power switch is opened, the switch mode of operation of 2 entered function two is pressed；
(2) according to production requirement, measuring instrument is used to access mechanical clamp provided with mechanical clamp interface, and measuring instrument can pass through machine
Tool fixture connects manipulator, to improve measurement accuracy, is needed two manipulator short circuits before measurement, then press calibration button, instrument
It is automatic to carry out internal zero calibration, remove mechanical clamp, manipulator and circuit resistance；
(3) then by button is once determined, the required resistance sub-elected is set, resistance setting range is
000 to 999, setting resistance column of the setting value on LCDs is shown；
(4) again by button is once determined, the unit to set resistance just now is set, have optional Ω, K Ω of third gear or
M Ω, unit switching is carried out by unit button；
(5) the required positive allowable error for sub-electing resistance is set, setting value is by liquid by button is once determined again
Positive error scope column on crystal display screen is shown；
(6) the required negative sense allowable error for sub-electing resistance is set, setting value is by liquid by button is once determined again
Negative sense error range column on crystal display screen is shown；
(7) during being set more than, when the next item up to be reset, by return button；
(8) terminate after above setting, manipulator contact resistance measures sorting to resistance, measures and meet sets requirement
Resistance；
(9) when manipulator institute contact resistance is less than setting range, then detect that status bar shows negative super, while manipulator should
Resistance is put into unqualified case；When manipulator institute contact resistance is higher than setting range, then detect that status bar shows positive excess, manipulator
The resistance is put into unqualified case；When manipulator institute contact resistance is in setting range, detection status bar shows qualified, simultaneously
Buzzer length is rung, and resistance is put into qualified case by manipulator；
(10) under three of the above state, measured value can show current contact resistance resistance in real time on liquid crystal display, for people
Work is monitored.Simultaneously under each state, signal output also can externally export unlike signal according to detection status bar, for extending out equipment
Receive.
It is constant-current source circuit figure as shown in Figure 3.Constant-current source is made up of differential amplifier A 1 and feedback operational amplifier A2, poor
Dynamic amplifier selects INA105, and feedback amplifier selects OP07.Reference voltage VREFIt is added on the input of differential amplifier INA105 positives
End, VREFFor 2.5V, voltage control load R1 output current Io, differential amplifier INA105 inverting inputs are directly grounded.
Voltage on R1 is input voltage VREF, produce constant load current Io.
Resistance is divided into six grades, six kinds of constant-current sources of correspondence：25mA, 2.5mA, 250uA, 25uA, 2.5uA, 250nA, lead to
Gear is crossed to switch over.Constant-current source belongs to low current converter,, need to be real with triode during such as 25mA when needing high current to export
Now expand stream.
It is constant-current source switching circuit figure as shown in Figure 4, gear switch is realized using electromagnetic relay (Relay).Due to electricity
Hinder gear and be provided with 100K Ω~1M Ω, 1M Ω~two grades of 100M Ω, therefore correspondingly need 2.5uA and 250nA constant-current source.
In the case of micro-current, there are electrical leakage problems if gear switch is realized using semiconductor switch device, influence measuring accuracy, so
Gear switch is realized using electromagnetic relay.
It is reference voltage source circuit figure as shown in Figure 5, using reference voltage source chip ADR441, solves the problems, such as temperature drift,
It ensure that precision well.
Linear power source circuit figure as shown in Figure 6, including traditional power frequency linear transformer, the first linear voltage-stabilizing device A3, the
Bilinear voltage-stabilizing device A4, third linear voltage-stabilizing device A5 and the 4th linear voltage stabilization device A6, the first linear voltage-stabilizing device A3 choosings
L7912, third linear voltage-stabilizing device A5 is selected to select L7805, the 4th linear voltage stabilization with L7812, the second linear voltage stabilization device A4
Device A6 selects LM1117-3.3V, and using inductance L1 to simulating with digitally carrying out isolation processing.The linear power supply is reduced
Ripple, and noise is not introduced.
It is switching array schematic diagram as shown in Figure 7, is 200 tunnels switching array.In actual production, potentiometer carbon plate permit
Perhaps error is generally ± 20%, and the product allowable error compared with high-quality is ± 10%, therefore the precision of test potential device carbon plate need not
Reached as test carbon film metalfilmresistor 0.1% precision, 1% precision is enough.Therefore multy-way switching array
Design, current leakage is considered during without as design constant-current source switching circuit, carries out cut-offfing control using semiconductor switch device
System, in the CJ2302N channel MOS type FETs of the high-end selection Low dark curient of carbon plate to be measured, when need to certain all the way carbon plate examine
During survey, the way switch device is turned on, it is tested by constant-current source.Device to carbon plate plate when carrying out automatic detection, respectively
Way switch device is sequentially turned on, and realizes that each road carbon plate is detected successively.
It is needle-bar test board schematic diagram as shown in Figure 8, including switching array output test lead and positioning hole, carry out carbon plate inspection
During survey, carbon plate plate is directed at positioning hole, needle-bar test board Shang Ge roads carbon plate automatically accesses test lead and carries out carbon plate test.
The utility model a tractor serves several purposes, can realize the quality testing of potentiometer carbon plate plate, can also realize carbon film metal film
The sorting measurement of resistance, flexibility is high, dramatically saves on the input of plant instrumentation equipment.
Claims (3)
1. a kind of potentiometer carbon plate tester that measurement function is sorted with resistance, it is characterised in that：Including human-computer interaction module,
Constant-current source, constant-current source switching circuit, reference voltage source, linear power supply, switching array and needle-bar test board；
Wherein, human-computer interaction module includes liquid crystal display area, power switch, functional select switch, key zone, mechanical clamp interface
And signal output；Constant-current source is made up of differential amplifier and feedback operational amplifier；Constant-current source switching circuit using electromagnetism after
Electrical equipment realizes gear switch；Reference voltage source circuit uses reference voltage source chip；Linear power source circuit linearly becomes including power frequency
Depressor, the first linear voltage-stabilizing device, the second linear voltage stabilization device, third linear voltage-stabilizing device, the 4th linear voltage stabilization device and electricity
Sense；It is that 200 tunnels switch array to switch array；Needle-bar test board includes switching array output test lead and positioning hole.
2. the potentiometer carbon plate tester according to claim 1 that measurement function is sorted with resistance, it is characterised in that：Institute
State the display content in liquid crystal display area include current operating state, setting resistance, setting resistance unit, positive negative sense error range,
Detection state, unqualified path and measured value.
3. the potentiometer carbon plate tester according to claim 1 that measurement function is sorted with resistance, it is characterised in that：Institute
Stating key zone includes determining button, returns to button, right and left key, upper lower key, unit button and calibration button.
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| CN201720373147.4U CN206479601U (en) | 2017-04-11 | 2017-04-11 | The potentiometer carbon plate tester of measurement function is sorted with resistance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872842A (en) * | 2017-04-11 | 2017-06-20 | 东南大学 | Potentiometer carbon plate tester and measuring method with resistance sorting measurement function |
-
2017
- 2017-04-11 CN CN201720373147.4U patent/CN206479601U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872842A (en) * | 2017-04-11 | 2017-06-20 | 东南大学 | Potentiometer carbon plate tester and measuring method with resistance sorting measurement function |
| CN106872842B (en) * | 2017-04-11 | 2023-09-15 | 东南大学 | Potentiometer carbon sheet tester with resistance sorting and measuring functions and measuring method |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170908 Termination date: 20210411 |