CN218629978U - Novel micro-Ohm measuring device with large number of points - Google Patents
Novel micro-Ohm measuring device with large number of points Download PDFInfo
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- CN218629978U CN218629978U CN202222772933.5U CN202222772933U CN218629978U CN 218629978 U CN218629978 U CN 218629978U CN 202222772933 U CN202222772933 U CN 202222772933U CN 218629978 U CN218629978 U CN 218629978U
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Abstract
The utility model discloses a novel micro-Ohm measuring device with large points, which comprises a measuring frame, a workbench arranged in the measuring frame, a lifting driving mechanism arranged above the workbench, a lifting plate connected with the lifting driving mechanism, a lower pressing test fixture arranged on the lifting plate, and a processing plate connected with the lower pressing test fixture; the workbench is also provided with a bearing frame, and the bearing frame is positioned right below the downward pressing test fixture; the pressing test fixture comprises a pressing driving mechanism, a test mounting frame connected with the pressing driving mechanism, and a needle bed support plate installed on the test mounting frame. The utility model discloses a mutually supporting of constant current source module, analog-to-digital conversion module and numerical value display module can realize measurationing to the automation of the low resistance of measurement stations such as PCB plate-line, hole, and the precision of measurationing is high, simultaneously, is equipped with a plurality of elastic probe, can measurationing to a plurality of measurement stations on the PCB board, and it is fast to measuratione, measurationally efficient, and the practicality is strong.
Description
Technical Field
The utility model relates to a PCB board low resistance measures technical field, especially relates to a novel little aomu of counting greatly device.
Background
The single-channel four-wire resistance measurement principle is a very sophisticated low-resistance measurement technology, but with the recent progress of the PCB manufacturing technology (the thinner and denser the wire and hole are), the thinner and denser the through hole is, the low-resistance difference of the through hole needs to be verified, and the denser the wire and hole is, which represents the explosive increase of the measurement quantity, the existing low-resistance measurement system and device cannot meet the normal use requirement, so that a low-resistance measurement (micro-ohm, the resistance of which is lower than 1m Ω or less) system with high measurement efficiency, high measurement precision and convenient use is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a novel little amem of counting greatly device, the device can realize measuring the automation of the low resistance of measurement stations such as PCB board line, hole through mutually supporting of constant current source module, analog-to-digital conversion module and numerical display module, and the precision of measurationing is high, simultaneously, is equipped with a plurality of elastic probe, can measurationally to a plurality of measurement stations on the PCB board, and it is fast to measurationally, the measurement efficiency is high, and the practicality is strong.
In order to realize the purpose, the following technical scheme is adopted:
a novel large-point micro-Ohm measuring device comprises a measuring rack, a workbench arranged in the measuring rack, a lifting driving mechanism arranged above the workbench, a lifting plate connected with the lifting driving mechanism, a lower pressing test fixture arranged on the lifting plate, and a processing plate connected with the lower pressing test fixture; the workbench is also provided with a bearing frame, and the bearing frame is positioned right below the downward pressing test fixture; the pressing test fixture comprises a pressing driving mechanism, a test mounting frame connected with the pressing driving mechanism, and a needle bed support plate arranged on the test mounting frame; the test mounting rack is also provided with a circuit connecting plate used for being connected with the processing plate, and the bottom of the needle bed carrier plate is also provided with a plurality of elastic probes; the bearing frame is used for bearing a PCB to be measured, and a plurality of measuring points are arranged on the PCB corresponding to the elastic probes; the processing board is provided with a constant current source module, an analog-digital conversion module and a numerical value display module; the constant current source module is used for inputting current to a measuring point of the PCB through the line connecting plate and the elastic probe to generate a voltage drop signal, the analog-digital conversion module is used for collecting the voltage drop signal, processing the voltage drop signal to convert the voltage drop signal into a digital signal, and then transmitting the digital signal to the numerical value display module to be displayed to the outside.
Further, the analog-digital conversion module comprises a signal acquisition module, a voltage amplification module, an RC filtering module and an AD conversion module which are connected in sequence.
Further, the constant current source module comprises an operational amplifier U75, a triode Q6, a resistor R118, a resistor R119, a current mirror, an operational amplifier U70, a triode Q5 and a triode Q7; the non-inverting input end of the operational amplifier U75 is used for being connected with an external reference voltage, the inverting input end of the operational amplifier U75 is connected with the emitting electrode of the triode Q6 and then grounded, and the output end of the operational amplifier U75 is connected with the base electrode of the triode Q6; the collector of the triode Q6 is connected with the current mirror through a resistor R118, and a resistor R119 is connected with the resistor R118 in parallel; the collector of the triode Q6 is also connected with the non-inverting input end of the operational amplifier U70, the inverting input end of the operational amplifier U70 is respectively connected with the current mirror and the emitter of the triode Q5, and the output end of the operational amplifier U70 is connected with the base of the triode Q7; and an emitting electrode of the triode Q7 is connected with a base electrode of the triode Q5, and a collecting electrode of the triode Q7 is used for inputting current to a measuring point on the PCB.
Furthermore, the signal acquisition module comprises two optical coupling switches, and the two optical coupling switches are respectively connected with two ends of a measuring point on the PCB.
Further, the voltage amplifying module comprises an integrated operational amplifier, and the chip model of the integrated operational amplifier is INA115BU.
Further, the AD conversion module comprises an AD conversion chip, and the chip model of the AD conversion chip is AD1674.
Furthermore, a working cavity is formed in the middle of the front face of the measuring rack, and the working table is arranged in the working cavity; the lifting driving mechanism comprises a fixed frame arranged on the inner wall of the top of the working cavity, a lifting cylinder arranged on the fixed frame and a lifting connecting seat connected with the lifting cylinder; the lifting plate is connected with the lifting connecting seat.
Furthermore, still install a plurality of lift guide bars in the work chamber, still install a plurality of linear bearing on the lifter plate, the lifter plate is located on the outer wall of lift guide bar through linear bearing cover.
Furthermore, the downward pressing driving mechanism comprises a mounting plate arranged at the top of the lifting plate and a plurality of downward pressing air cylinders arranged on the mounting plate; the test mounting frame is arranged at the bottom of the lifting plate and connected with an output shaft of the pressing cylinder.
Furthermore, a plurality of limiting clamping blocks used for limiting and fixing the PCB are further arranged on the bearing frame.
Adopt above-mentioned scheme, the beneficial effects of the utility model are that:
the device can realize the automatic measurement of the low resistance of measuring points such as PCB lines, holes and the like through the mutual matching of the constant current source module, the analog-digital conversion module and the numerical value display module, has high measurement precision, is provided with a plurality of elastic probes, can measure a plurality of measuring points on the PCB, and has high measurement speed, high measurement efficiency and strong practicability.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic view of the present invention;
fig. 3 is a circuit diagram of the constant current source module of the present invention;
wherein the figures are identified as follows:
1-a measuring rack; 2, a workbench;
3-a lifting drive mechanism; 4, lifting plates;
5, pressing down the test fixture; 6-a carrying frame;
7-constant current source module; 8, an analog-digital conversion module;
9-a numerical value display module; 31-a lifting cylinder;
32-lifting guide rod; 33-linear bearings;
51-a push-down drive mechanism; 52-test mount;
81-a signal acquisition module; 82-a voltage amplification module;
83-RC filtering module; 84-AD conversion module.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 3, the utility model provides a novel micro-Ohm measuring device with large number of points, which comprises a measuring frame 1, a workbench 2 arranged in the measuring frame 1, a lifting driving mechanism 3 arranged above the workbench 2, a lifting plate 4 connected with the lifting driving mechanism 3, a pressing test fixture 5 arranged on the lifting plate 4, and a processing plate connected with the pressing test fixture 5; the workbench 2 is also provided with a bearing frame 6, and the bearing frame 6 is positioned right below the downward pressing test fixture 5; the downward pressing test fixture 5 comprises a downward pressing driving mechanism 51, a test mounting frame 52 connected with the downward pressing driving mechanism 51, and a needle bed support plate arranged on the test mounting frame 52; the test mounting frame 52 is also provided with a circuit connecting plate for connecting with the processing plate, and the bottom of the needle bed carrier plate is also provided with a plurality of elastic probes; the bearing frame 6 is used for bearing a PCB to be measured, and a plurality of measuring points are arranged on the PCB corresponding to the elastic probes; the processing board is provided with a constant current source module 7, an analog-digital conversion module 8 and a digital display module 9; the constant current source module 7 is used for inputting current to a measuring point of the PCB through the circuit connecting plate and the elastic probe to generate a voltage drop signal, the analog-digital conversion module 8 is used for collecting the voltage drop signal, processing the voltage drop signal to convert the voltage drop signal into a digital signal, and then transmitting the digital signal to the numerical value display module 9 to be displayed to the outside.
With reference to fig. 1 to 3, a working cabinet is disposed on the upper portion of the measurement rack 1, a caster foot cup is disposed on the bottom of the measurement rack 1 for moving, a working table 2 is disposed in the measurement rack 1, a carrying frame 6 is disposed on the working table 2, the carrying frame 6 is used for carrying a PCB to be measured, during measurement, the lifting plate 4 is driven by the lifting driving mechanism 3 to drive the pressing testing jig 5 to descend for a certain stroke, then, the needle bed carrier plate on the testing mounting frame 52 is pressed against the PCB under the driving of the pressing driving mechanism 51 of the pressing testing jig 5, so that a plurality of elastic probes disposed on the bottom of the needle bed carrier plate are connected to the measuring points on the PCB, and then, as shown in fig. 1, the constant current source module 7 is used to input current to the measuring points of the PCB through the circuit connecting plate and the elastic probes to generate voltage drop signals (SWn _ I + and SWn _ I-can be switched first to flow 100mA current to the measuring points), and then, the analog-to-digital conversion module 8 collects the voltage drop signals and converts the voltage drop signals to be transmitted to the digital display the internal measuring points, so that the measuring efficiency of the measurement module can be switched to the external measurement module and the measurement module can be improved.
Preferably, the analog-digital conversion module 8 includes a signal acquisition module 81, a voltage amplification module 82, an RC filtering module 83 and an AD conversion module 84, which are connected in sequence. In this embodiment, after the constant current source module 7 inputs current to the measuring point of the PCB through the circuit connecting board and the elastic probe to generate a voltage drop signal, the signal acquisition module 81 acquires the signal, amplifies the signal through the voltage amplification module 82, performs filtering processing through the RC filtering module 83, converts the signal into a digital signal through the AD conversion module 84, reads a value through the DIO card, and displays the measured resistance value to the outside through the value display module 9.
Preferably, the constant current source module 7 includes an operational amplifier U75, a transistor Q6, a resistor R118, a resistor R119, a current mirror, an operational amplifier U70, a transistor Q5, and a transistor Q7; the non-inverting input end of the operational amplifier U75 is used for being connected with an external reference voltage, the inverting input end of the operational amplifier U75 is connected with the emitting electrode of the triode Q6 and then grounded, and the output end of the operational amplifier U75 is connected with the base electrode of the triode Q6; the collector of the triode Q6 is connected with the current mirror through a resistor R118, and a resistor R119 is connected with the resistor R118 in parallel; the collector of the triode Q6 is also connected with the non-inverting input end of the operational amplifier U70, the inverting input end of the operational amplifier U70 is respectively connected with the current mirror and the emitter of the triode Q5, and the output end of the operational amplifier U70 is connected with the base of the triode Q7; an emitting electrode of the triode Q7 is connected with a base electrode of the triode Q5, and a collecting electrode of the triode Q7 is used for inputting current to a measuring point on the PCB; the signal acquisition module 81 comprises two optical coupling switches, and the two optical coupling switches are respectively connected with two ends of a measuring point on the PCB.
In this embodiment, the voltage amplification module 82 includes an integrated operational amplifier having a chip model number INA115BU; the AD conversion module 84 includes an AD conversion chip, which has a chip model of AD1674; in specific operation, referring to fig. 3, a 4V reference voltage is input to the non-inverting input terminal of the operational amplifier U75, so that a current of 4V/4k =1ma is generated at the inverting input terminal of the U75, and at this time, the current (1 mA) of the balanced Q6-Ie is adjusted at the output terminal of the U75; the resistance R118/R119=7.5k, a loop current 1mA flows through, so that the non-inverting input end of the node voltage U70 =40.5V, and the output end of the U70 can adjust the Darlington current of Q7+ Q6, so that the inverting input end of the U70 =40.5V, however, the current mirror 2 times obtains the resistance =75Ohm, the constant current source module 7 stably outputs 100mA, the output 100mA current flows through the measuring point, a voltage drop (if the output 100mA current flows through the measuring point, a 100uV voltage drop is generated), and the signal can be acquired through the optical coupler switch V + and the optical coupler switch V < - > (a 100uV signal can be acquired); the collected signals are amplified by a voltage amplification module 82 (the signals can be amplified by 951.77 times and are 95.177 mV), filtered by an RC filter module 83, and then converted into digital signals by an AD conversion module 84; in this embodiment, the AD conversion chip of the AD conversion module 84 has a chip model of AD1674, which is decomposed into 4096 steps resolution at 10V, and the minimum analog voltage analysis scale is 2.44mV, and as can be seen from the above conversion, 0.1mOhm can obtain 9.5177mV signal, and the signal amount is more than 3 times larger than the minimum circuit analysis.
Preferably, the middle part of the front surface of the measuring rack 1 is also provided with a working cavity, and the workbench 2 is arranged in the working cavity; the lifting driving mechanism 3 comprises a fixed frame arranged on the inner wall of the top of the working cavity, a lifting cylinder 31 arranged on the fixed frame, and a lifting connecting seat connected with the lifting cylinder 31; the lifting plate 4 is connected with the lifting connecting seat; still install a plurality of lift guide bar 32 in the working chamber, still install a plurality of linear bearing 33 on the lifter plate 4, lifter plate 4 is located on the outer wall of lift guide bar 32 through linear bearing 33 cover. In this embodiment, the lifting plate 4 is driven by the lifting cylinder 31 to drive the downward pressing test fixture 5 to descend for a certain stroke, and meanwhile, the lifting guide rods 32 are provided to ensure the lifting stability.
Preferably, the downward pressing driving mechanism 51 comprises a mounting plate arranged on the top of the lifting plate 4, and a plurality of downward pressing cylinders mounted on the mounting plate; the test mounting frame 52 is arranged at the bottom of the lifting plate 4 and is connected with an output shaft of the pressing cylinder; and the bearing frame 6 is also provided with a plurality of limiting clamping blocks for limiting and fixing the PCB. In this embodiment, pressure sensor is still installed to the output shaft of air cylinder and the junction of test mounting bracket 52 down, but the pressure value of real-time detection pushing down avoids crushing the PCB board, simultaneously, still installs a plurality of spacing clamp splice on the bearing frame 6, can be with the spacing fixed of PCB board, and the assurance is measured time measuring, and it is placed stably.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A novel large-point micro-ohm measuring device is characterized by comprising a measuring rack, a workbench, a lifting driving mechanism, a lifting plate, a lower pressing test fixture and a processing plate, wherein the workbench is arranged in the measuring rack; the workbench is also provided with a bearing frame, and the bearing frame is positioned right below the downward pressing test fixture; the pressing test fixture comprises a pressing driving mechanism, a test mounting frame connected with the pressing driving mechanism, and a needle bed support plate arranged on the test mounting frame; the test mounting rack is also provided with a circuit connecting plate used for being connected with the processing plate, and the bottom of the needle bed carrier plate is also provided with a plurality of elastic probes; the bearing frame is used for bearing a PCB to be measured, and a plurality of measuring points are arranged on the PCB corresponding to the elastic probes; the processing board is provided with a constant current source module, an analog-digital conversion module and a numerical value display module; the constant current source module is used for inputting current to a measuring point of the PCB through the line connecting plate and the elastic probe to generate a voltage drop signal, the analog-digital conversion module is used for collecting the voltage drop signal, processing the voltage drop signal to convert the voltage drop signal into a digital signal, and then transmitting the digital signal to the numerical value display module to be displayed to the outside.
2. The device of claim 1, wherein the analog-to-digital conversion module comprises a signal acquisition module, a voltage amplification module, an RC filter module, and an AD conversion module, which are connected in sequence.
3. The new high-point micro-ohm measuring device according to claim 2, wherein the constant current source module comprises an operational amplifier U75, a transistor Q6, a resistor R118, a resistor R119, a current mirror, an operational amplifier U70, a transistor Q5, a transistor Q7; the non-inverting input end of the operational amplifier U75 is used for being connected with an external reference voltage, the inverting input end of the operational amplifier U75 is connected with the emitting electrode of the triode Q6 and then grounded, and the output end of the operational amplifier U75 is connected with the base electrode of the triode Q6; the collector of the triode Q6 is connected with the current mirror through a resistor R118, and a resistor R119 is connected with the resistor R118 in parallel; the collector of the triode Q6 is also connected with the non-inverting input end of the operational amplifier U70, the inverting input end of the operational amplifier U70 is respectively connected with the current mirror and the emitter of the triode Q5, and the output end of the operational amplifier U70 is connected with the base of the triode Q7; and an emitting electrode of the triode Q7 is connected with a base electrode of the triode Q5, and a collecting electrode of the triode Q7 is used for inputting current to a measuring point on the PCB.
4. The device as claimed in claim 3, wherein the signal collection module comprises two optical couplers, and the two optical couplers are respectively connected to two ends of the testing point on the PCB.
5. The apparatus of claim 2, wherein said voltage amplification module comprises an integrated operational amplifier having an INA115BU chip size.
6. The apparatus as claimed in claim 2, wherein the AD converter module comprises an AD converter chip of type AD1674.
7. The novel micro-ohm measuring device with large number of points as claimed in claim 1, wherein a working chamber is further formed in the middle of the front surface of the measuring rack, and the working table is arranged in the working chamber; the lifting driving mechanism comprises a fixed frame arranged on the inner wall of the top of the working cavity, a lifting air cylinder arranged on the fixed frame and a lifting connecting seat connected with the lifting air cylinder; the lifting plate is connected with the lifting connecting seat.
8. The apparatus of claim 7, wherein a plurality of lift guide rods are further installed in the working chamber, a plurality of linear bearings are further installed on the lift plate, and the lift plate is sleeved on the outer wall of each lift guide rod through the linear bearings.
9. The apparatus of claim 7, wherein the push actuator comprises a mounting plate disposed on top of the lift plate, and a plurality of push cylinders mounted on the mounting plate; the test mounting frame is arranged at the bottom of the lifting plate and connected with an output shaft of the pressing cylinder.
10. The apparatus of claim 1, wherein a plurality of positioning clips for positioning and fixing the PCB are further mounted on the supporting frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222772933.5U CN218629978U (en) | 2022-10-20 | 2022-10-20 | Novel micro-Ohm measuring device with large number of points |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222772933.5U CN218629978U (en) | 2022-10-20 | 2022-10-20 | Novel micro-Ohm measuring device with large number of points |
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| Publication Number | Publication Date |
|---|---|
| CN218629978U true CN218629978U (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222772933.5U Active CN218629978U (en) | 2022-10-20 | 2022-10-20 | Novel micro-Ohm measuring device with large number of points |
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| CN (1) | CN218629978U (en) |
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- 2022-10-20 CN CN202222772933.5U patent/CN218629978U/en active Active
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