CN219676144U - Multichannel resistance measuring device - Google Patents
Multichannel resistance measuring device Download PDFInfo
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- CN219676144U CN219676144U CN202320648076.XU CN202320648076U CN219676144U CN 219676144 U CN219676144 U CN 219676144U CN 202320648076 U CN202320648076 U CN 202320648076U CN 219676144 U CN219676144 U CN 219676144U
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Abstract
The utility model discloses a multichannel resistance measurement device, which belongs to the field of resistance measurement and is used for monitoring resistance values of a plurality of resistors. The first multi-choice analog switch can be controlled by the control module to connect one of the plurality of resistors to be tested connected with the first multi-choice analog switch with the resistor detection circuit, the resistor detection circuit can convert the resistance value of the resistor connected with the first multi-choice analog switch into the electrical parameter with the corresponding value, the control module is convenient to determine the resistance value of the resistor to be tested, the switching test of the plurality of resistors to be tested can be automatically finished, and the state switching speed of the first multi-choice analog switch is high, so that the testing efficiency is high.
Description
Technical Field
The utility model relates to the field of resistance measurement, in particular to a multi-channel resistance measurement device.
Background
The variable resistor is a common component, the resistance value of the variable resistor can be changed along with the change of factors such as environmental variables, for example, the variable resistor in various resistance sensors, and the like, and the requirement of simultaneously monitoring the resistance values of a plurality of variable resistors exists in certain scenes, however, the prior art lacks a mature multi-channel resistance measuring device, so that the working efficiency is low and the labor cost is high when the resistance values of a plurality of variable resistors to be measured are measured.
Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.
Disclosure of Invention
The utility model aims to provide a multi-channel resistance measuring device which can automatically finish switching tests of a plurality of resistors to be measured, and has high testing efficiency because the state of a first one-out-of-one analog switch is fast in switching speed.
In order to solve the above technical problems, the present utility model provides a multi-channel resistance measurement device, including:
the first multi-choice analog switch is respectively connected with a plurality of resistors to be tested and is used for connecting one of the resistors to be tested with the resistor detection circuit under the control of the control module;
the resistance detection circuit is respectively connected with the first multi-choice analog switch and the control module and is used for generating an electric parameter with a value corresponding to the resistance value of the resistance to be detected based on the resistance to be detected connected with the resistance detection circuit;
and the control module is connected with the first alternative analog switch and is used for determining the resistance value of the resistor to be tested according to the electric parameter.
Preferably, the resistance detection circuit includes:
the reference voltage sources are respectively connected with the first ends of the plurality of resistors to be tested and are used for outputting reference voltages;
the second one-out-of-many analog switch is used for connecting a circuit between the input end of the second one-out-of-many analog switch and a specified output end under the control of the control module so as to divide the voltage with the resistor to be tested by using the specified matching resistor;
the first ends are connected with the output ends of the second multi-selection analog switch in a one-to-one correspondence manner, and the second ends are grounded and provided with a plurality of matching resistors with different resistance values;
and the analog voltage of the connection point of the first multi-one analog switch and the second multi-one analog switch is the electric parameter.
Preferably, the resistance detection circuit further includes:
the input end is connected with the output end of the first multi-choice analog switch, the output end is connected with the signal conditioning circuit of the control module and is used for pre-conditioning the analog voltage and then sending the pre-conditioned analog voltage to the control module, so that the control module can determine the resistance value of the resistor to be tested according to the pre-conditioned analog voltage.
Preferably, the signal conditioning circuit comprises:
the first end is used as a filter circuit of the input end of the signal conditioning circuit and used for filtering the analog voltage;
the input end is connected with the second end of the filter circuit, and the output end is used as a signal amplifying circuit of the output end of the signal conditioning circuit and used for carrying out numerical amplification on the filtered analog voltage.
Preferably, the first one-to-one analog switch, the second one-to-one analog switch and the signal conditioning circuit are all multiple, and the first one-to-one analog switch, the second one-to-one analog switch and the signal conditioning circuit are connected in one-to-one correspondence.
Preferably, the multi-channel resistance measuring apparatus further comprises:
and the prompter is connected with the control module and used for prompting the latest resistance value of each resistor to be tested under the control of the control module.
Preferably, the control module includes:
the input end of the analog-to-digital conversion circuit is connected with the output end of the signal conditioning circuit and is used for converting the analog voltage into a digital signal;
and the input end of the processing module is connected with the output end of the analog-to-digital conversion circuit, and the processing module is used for determining the resistance value of the resistor to be tested according to the digital signal.
Preferably, the processing module includes:
the receiving end is connected with the output end of the analog-to-digital conversion circuit, and the output end is connected with the host computer of the MCU;
the MCU with the control end connected with the first multi-one analog switch and the second multi-one analog switch is used for controlling the channel gating state of the first multi-one analog switch and the second multi-one analog switch under the control of the host.
Preferably, the analog-to-digital conversion circuit is a data acquisition card;
the reference voltage source is an analog output end of the data acquisition card.
Preferably, the multi-channel resistance measuring apparatus further comprises:
and the reference voltage circuit is respectively connected with the analog output end of the data acquisition card and the first end of each resistor to be tested, and is used for removing noise of the reference voltage output by the analog output end and amplifying the reference voltage.
The utility model provides a multi-channel resistance measuring device, wherein a first multi-selection analog switch can be used for connecting one of a plurality of resistors to be measured connected with the first multi-selection analog switch with a resistance detection circuit under the control of a control module, the resistance detection circuit can be used for converting the resistance value of the resistor connected with the first multi-selection analog switch into an electric parameter with a corresponding value, the control module is convenient for determining the resistance value of the resistor to be measured, the switching test of the plurality of resistors to be measured can be automatically finished, and the state switching speed of the first multi-selection analog switch is high, so that the test efficiency is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a multi-channel resistance measuring device according to the present utility model;
FIG. 2 is a schematic diagram of a multi-channel resistance measuring device according to another embodiment of the present utility model;
FIG. 3 is a schematic diagram of a resistance detection circuit according to the present utility model;
fig. 4 is a schematic structural diagram of a reference voltage circuit according to the present utility model.
Detailed Description
The core of the utility model is to provide a multi-channel resistance measuring device, which can automatically complete the switching test of a plurality of resistors to be measured, and has high test efficiency because the state switching speed of the first one-for-one analog switch is high.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a multi-channel resistance measurement device according to the present utility model, where the multi-channel resistance measurement device includes:
the first one-out-of-more analog switch 1 is respectively connected with a plurality of resistors to be tested and is used for connecting one of the resistors to be tested with the resistor detection circuit 2 under the control of the control module 3;
the resistor detection circuit 2 is respectively connected with the first multi-choice analog switch 1 and the control module 3 and is used for generating an electric parameter with a value corresponding to the resistance value of the resistor to be detected based on the resistor to be detected connected with the resistor detection circuit;
and the control module 3 is connected with the first alternative analog switch 1 and is used for determining the resistance value of the resistor to be tested according to the electric parameters.
Specifically, in view of the technical problems in the background art, the channel switching can be performed quickly by combining with the consideration of the one-for-many analog switch, so that different resistance access circuits to be tested are selected to perform resistance detection, and the resistance measurement can be realized automatically while higher test efficiency is facilitated.
Specifically, the resistor detection circuit 2 may generate an electrical parameter having a value corresponding to the resistance value of the resistor to be detected based on the resistor to be detected connected to itself, and then the electrical parameter may be transmitted to the control module 3, and the control module 3 may determine the resistance value of the resistor to be detected according to the electrical parameter.
The number of the resistors to be tested can be set autonomously, and the upper limit of the resistors to be tested can be the number of multiple input ends in the multiple-choice analog switch, for example, 16, etc., which is not limited in the embodiment of the utility model.
The first one-out-of-more analog switch 1 can be controlled by the control module 3 to complete channel switching, so that the resistance value detection of each resistor to be detected can be automatically realized in a circulating way, and the degree of automation is improved.
In particular, the specific type of the electrical parameter may be various, for example, may be an analog voltage, etc., and the embodiment of the present utility model is not limited herein.
The utility model provides a multi-channel resistance measuring device, wherein a first multi-selection analog switch can be used for connecting one of a plurality of resistors to be measured connected with the first multi-selection analog switch with a resistance detection circuit under the control of a control module, the resistance detection circuit can be used for converting the resistance value of the resistor connected with the first multi-selection analog switch into an electric parameter with a corresponding value, the control module is convenient for determining the resistance value of the resistor to be measured, the switching test of the plurality of resistors to be measured can be automatically finished, and the state switching speed of the first multi-selection analog switch is high, so that the test efficiency is high.
For better illustrating the embodiments of the present utility model, please refer to fig. 2 and fig. 3, fig. 2 is a schematic structural diagram of another multi-channel resistance measurement device provided by the present utility model, and fig. 3 is a schematic structural diagram of a resistance detection circuit 2 provided by the present utility model, as a preferred embodiment, the resistance detection circuit 2 includes:
the reference voltage sources are respectively connected with the first ends of the plurality of resistors to be tested and are used for outputting reference voltages;
the second one-out-of-multiple analog switch with the input end connected with the output end of the first one-out-of-multiple analog switch 1 is used for connecting a circuit between the input end of the second one-out-of-multiple analog switch and a specified output end under the control of the control module 3 so as to divide voltage by using a specified matching resistor and a resistor to be detected;
the first ends are connected with the output ends of the second one-out-of-more analog switches in a one-to-one correspondence manner, and the second ends are grounded through a plurality of matching resistors with different resistance values;
the analog voltage of the connection point of the first multi-one analog switch 1 and the second multi-one analog switch is an electrical parameter.
Specifically, the working principle of the resistor detection circuit 2 is that the matching resistor is connected with the resistor to be detected in series, so that the analog voltage value of the point between the two resistors is output, and the analog voltage value is used as the electric parameter generated based on the resistance value conversion of the resistor to be detected.
In the embodiment of the utility model, when the resistance value of the matching resistor connected in series with the single resistor to be measured is similar to the resistance value variation range of the resistor to be measured, the analog voltage value generated based on conversion can be used for more accurately calculating the resistance value, however, in a plurality of resistors to be measured, the resistance value variation ranges of different resistors to be measured can have larger deviation, so that a plurality of matching resistors can be arranged under the condition, and the advantage of high response speed of the one-to-one analog switch is combined and considered.
It should be noted that, in the embodiment of the present utility model, the control module 3 may store in advance the correspondence between the channel of the resistor to be tested and the matching resistor channel, for example, for the resistor to be tested of the first channel (the first one-more-one analog switch 1), the resistance value of the matching resistor of the third channel (the second one-more-one analog switch) is closest to the first channel, so that the correspondence between the resistor to be tested of the first channel and the matching resistor of the third channel is established, and the correspondence may be established in advance by a worker, or may be automatically generated by the control module 3, and the generating manner may be: for any resistor to be tested, the matching resistors can be sequentially switched and connected in series, and the matching resistor closest to half of the reference voltage value in the analog voltage generated by the conversion when different matching resistors are connected in series is used as the matching resistor corresponding to the current resistor to be tested, so that the corresponding relation between each resistor to be tested and the matching resistor is constructed, and when in formal test, the first and second one-to-one analog switches can be controlled according to the corresponding relation, so that the degree of automation is further improved.
Of course, the resistance detection circuit 2 may take other specific forms besides this specific configuration, and the embodiment of the present utility model is not limited herein.
Specifically, as shown in fig. 3, the single-channel resistance measurement circuit includes a to-be-measured resistance selection circuit (first one-more analog switch 1), a matching resistance selection circuit (second one-more analog switch and a plurality of matching resistors), and a signal conditioning circuit, where the to-be-measured resistance selection circuit includes a to-be-measured resistance array and a 16:1 analog switch, and is used for selecting a currently measured resistance and connecting the currently measured resistance to the circuit. One end (common end) of each resistor in the resistor array to be tested is connected to the reference voltage Vref, one end is respectively connected to each input end S1-S12 of the 16:1 analog switch chip, and the output end D of the 16:1 analog switch chip is connected to the circuit node Vd. The matching resistor selection circuit comprises 4 matching resistors R1-R4 and 4:1 analog switches, one ends of the resistors of the matching resistors R1-R4 are grounded, one ends of the resistors are respectively connected to the input ends S1-S4 of the 4:1 analog switch chip, and the output end D of the 4:1 analog switch chip is connected to the circuit node Vd. The matching resistor selection circuit is used for selecting a standard resistor access circuit with the resistance closest to the resistor to be measured, so that a unilateral bridge is formed, and a more accurate measurement result is obtained. The signal conditioning circuit is mainly composed of a voltage follower and is used for reducing noise of voltage to be measured and improving load capacity. One end of the capacitor C4 is connected with the resistor R5 and is connected to the circuit node Vd, the other end of the capacitor C4 is grounded, the other end of the resistor R5 is connected to the "+" input end of the operational amplifier OPA, the "-" input end of the operational amplifier OPA is connected to the output end of the operational amplifier OPA and one end of the resistor R6, and the other end of the resistor R6 is the output voltage VOUT of the channel and is connected to the analog input port AI of the data acquisition card. The resistance Rx of the resistor to be measured can be calculated by the matching resistor Rn, the reference voltage Vref and the output voltage VOUT: rx= (Vref-VOUT) Rn/VOUT.
When the device is used, the host 321 sends a measurement command to enable the analog output port AO of the data acquisition card to output reference voltage and start system initialization. The initialization process needs to record the matching resistance corresponding to each resistor to be tested. During initialization, the MCU322 controls the 16:1 analog switch chip of each channel, and simultaneously selects the input terminal S1 to be conducted with the output terminal D thereof, so that the 1 st resistor in the resistor array to be tested of each channel is connected to the circuit. The MCU322 controls the input ends S1-S4 of the 4:1 analog switch chip to be alternately conducted with the output end D of the analog switch chip, so that 4 matching resistors are alternately connected in, meanwhile, the data acquisition card is used for measuring the output voltage VOUT corresponding to each matching resistor, and the matching resistor corresponding to the VOUT closest to Vref/2 is selected and recorded. And then the 2 nd to 16 th resistors in the resistor array to be tested of each channel are accessed in turn, the operation is carried out, and after all the resistors to be tested and the matched resistors are recorded, the initialization is completed. During testing, the 1 st resistor and the matching resistor in the resistor array to be tested of each channel are connected into the circuit, and the output voltage VOUT of each channel is measured by the data acquisition card. And sequentially and alternately connecting the 2 nd to 16 th resistors to be tested and the matched resistors thereof in the resistor array to be tested of each channel, and measuring the output voltage VOUT. If continuous measurement is needed, the above procedure is continued to be repeated. The resistance Rx of the resistor to be measured can be calculated by the matching resistor Rn, the reference voltage Vref and the output voltage VOUT: rx= (Vref-VOUT) Rn/VOUT.
As a preferred embodiment, the resistance detection circuit 2 further includes:
the input end is connected with the output end of the first multi-choice analog switch 1, and the output end is connected with the signal conditioning circuit of the control module 3 and is used for pre-conditioning analog voltage and then sending the pre-conditioned analog voltage to the control module 3, so that the control module 3 determines the resistance value of the resistor to be measured according to the pre-conditioned analog voltage.
Specifically, considering that the control module 3 has a certain requirement on signal quality during the processing of the analog voltage, in order to further improve the measurement accuracy, the signal conditioning circuit in the embodiment of the utility model can pre-condition the analog voltage and then send the pre-conditioned analog voltage to the control module 3, so that the control module 3 determines the resistance value of the resistor to be measured according to the pre-conditioned analog voltage.
As a preferred embodiment, the signal conditioning circuit comprises:
the first end is used as a filter circuit of the input end of the signal conditioning circuit and used for filtering the analog voltage;
the input end is connected with the second end of the filter circuit, and the output end is used as a signal amplifying circuit of the output end of the signal conditioning circuit and used for carrying out numerical amplification on the filtered analog voltage.
Specifically, the filtering can filter noise in the analog voltage signal, and the numerical amplification can improve the driving capability of the analog voltage.
Of course, the signal conditioning circuit may be of various types other than this specific form, and embodiments of the present utility model are not limited herein.
As a preferred embodiment, the first one-to-one analog switch 1, the second one-to-one analog switch and the signal conditioning circuit are all plural, and the first one-to-one analog switch 1, the second one-to-one analog switch and the signal conditioning circuit are connected in one-to-one correspondence.
Specifically, in order to further increase the number of resistance measurements, in the embodiment of the present utility model, a plurality of first one-for-one analog switches 1, second one-for-one analog switches, and signal conditioning circuits may be provided, where the three have a one-to-one connection relationship.
Wherein, the number of the three can be set independently, and the embodiment of the utility model is not limited herein.
As a preferred embodiment, the multi-channel resistance measuring apparatus further comprises:
and the prompter is connected with the control module 3 and is used for prompting the latest resistance value of each resistor to be tested under the control of the control module 3.
Specifically, in order to facilitate the staff to know the measured resistance value in time, a prompter may be further provided in the embodiment of the present utility model, which is used for prompting the latest resistance value of each resistor to be measured under the control of the control module 3.
The prompter may be of various types, for example, may be a display, and the embodiment of the present utility model is not limited herein.
As a preferred embodiment, the control module 3 comprises:
the input end of the analog-to-digital conversion circuit 31 is connected with the output end of the signal conditioning circuit and is used for converting the analog voltage into a digital signal;
the processing module 32, the input end of which is connected with the output end of the analog-digital conversion circuit 31, is used for determining the resistance value of the resistor to be tested according to the digital signal.
In particular, considering that most chips can directly process digital signals, the control module 3 in the embodiment of the present utility model includes an analog-to-digital conversion circuit 31, which can convert analog voltage into digital signals, so that the processing module 32 can process the digital signals conveniently, and determine the resistance value of the resistor to be tested according to the digital signals.
When the resistance value of the resistor to be measured is determined according to the digital signal, the reference voltage value and the resistance value of the matching resistor can be used for calculation, and the specific calculation process is not described herein.
As a preferred embodiment, the processing module 32 comprises:
the receiving end is connected with the output end of the analog-digital conversion circuit 31, and the output end is connected with the host 321 of the input end of the singlechip MCU 322;
the control end is respectively connected with the MCU322 of the first multi-one analog switch 1 and the second multi-one analog switch, and is used for controlling the channel gating states of the first multi-one analog switch 1 and the second multi-one analog switch under the control of the host 321.
Specifically, the main sub-structures of the host 321 and the MCU322 have the advantages of simple structure, easy troubleshooting, and the like.
Of course, the processing module 32 may have other specific configurations besides this specific configuration, and embodiments of the present utility model are not limited herein.
As a preferred embodiment, the analog-to-digital conversion circuit 31 is a data acquisition card;
the reference voltage source is an analog output end of the data acquisition card.
Specifically, the data acquisition card has the advantages of high integration level, small volume, high processing speed and the like.
Of course, the analog-to-digital conversion circuit 31 may be of various types other than the data acquisition card, and the embodiment of the present utility model is not limited herein.
For better illustrating the embodiments of the present utility model, please refer to fig. 4, fig. 4 is a schematic structural diagram of a reference voltage circuit 4 provided in the present utility model, and as a preferred embodiment, the multi-channel resistance measuring device further includes:
and the reference voltage circuit 4 is respectively connected with the analog output end of the data acquisition card and the first end of each resistor to be tested, and is used for removing noise of the reference voltage output by the analog output end and amplifying the reference voltage.
Specifically, considering that the reference voltage output by the analog output end may have a certain noise and is poor in stability, the reference voltage circuit 4 may be configured in the embodiment of the present utility model, so as to remove the noise of the reference voltage output by the analog output end and amplify the reference voltage.
In fig. 4, the analog output port AO is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the capacitor C1 and the "+" input end of the operational amplifier OPA, and the other end of the capacitor C1 is grounded. Thus, the resistor R1 and the capacitor C1 form a low-pass filter, so that noise of the output voltage of the analog output port AO can be reduced. The output of the operational amplifier OPA is connected to its "-" input constituting a voltage follower, which can improve the load carrying capacity. The output end of the operational amplifier OPA is connected with one end of the capacitor C4, the voltage at the point is the reference voltage Vref, the other end of the capacitor C4 is grounded, the capacitor C4 has the functions of energy storage and filtering, and the stability of the voltage can be improved.
Of course, the reference voltage circuit 4 may be of other types besides the specific structure of fig. 4, and the embodiment of the present utility model is not limited herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A multi-channel resistance measurement device, comprising:
the first multi-choice analog switch is respectively connected with a plurality of resistors to be tested and is used for connecting one of the resistors to be tested with the resistor detection circuit under the control of the control module;
the resistance detection circuit is respectively connected with the first multi-choice analog switch and the control module and is used for generating an electric parameter with a value corresponding to the resistance value of the resistance to be detected based on the resistance to be detected connected with the resistance detection circuit;
and the control module is connected with the first alternative analog switch and is used for determining the resistance value of the resistor to be tested according to the electric parameter.
2. The multi-channel resistance measurement device of claim 1, wherein the resistance detection circuit comprises:
the reference voltage sources are respectively connected with the first ends of the plurality of resistors to be tested and are used for outputting reference voltages;
the second one-out-of-many analog switch is used for connecting a circuit between the input end of the second one-out-of-many analog switch and a specified output end under the control of the control module so as to divide the voltage with the resistor to be tested by using the specified matching resistor;
the first ends are connected with the output ends of the second multi-selection analog switch in a one-to-one correspondence manner, and the second ends are grounded and provided with a plurality of matching resistors with different resistance values;
and the analog voltage of the connection point of the first multi-one analog switch and the second multi-one analog switch is the electric parameter.
3. The multi-channel resistance measurement device of claim 2, wherein the resistance detection circuit further comprises:
the input end is connected with the output end of the first multi-choice analog switch, the output end is connected with the signal conditioning circuit of the control module and is used for pre-conditioning the analog voltage and then sending the pre-conditioned analog voltage to the control module, so that the control module can determine the resistance value of the resistor to be tested according to the pre-conditioned analog voltage.
4. A multi-channel resistance measurement device as claimed in claim 3, wherein the signal conditioning circuit comprises:
the first end is used as a filter circuit of the input end of the signal conditioning circuit and used for filtering the analog voltage;
the input end is connected with the second end of the filter circuit, and the output end is used as a signal amplifying circuit of the output end of the signal conditioning circuit and used for carrying out numerical amplification on the filtered analog voltage.
5. The multi-channel resistance measuring device of claim 4, wherein the first one-to-one analog switch, the second one-to-one analog switch, and the signal conditioning circuit are all plural, and the first one-to-one analog switch, the second one-to-one analog switch, and the signal conditioning circuit are connected in one-to-one correspondence.
6. A multi-channel resistance measuring device as claimed in claim 3, further comprising:
and the prompter is connected with the control module and used for prompting the latest resistance value of each resistor to be tested under the control of the control module.
7. The multi-channel resistance measurement device of any one of claims 3 to 6, wherein the control module comprises:
the input end of the analog-to-digital conversion circuit is connected with the output end of the signal conditioning circuit and is used for converting the analog voltage into a digital signal;
and the input end of the processing module is connected with the output end of the analog-to-digital conversion circuit, and the processing module is used for determining the resistance value of the resistor to be tested according to the digital signal.
8. The multi-channel resistance measurement device of claim 7, wherein the processing module comprises:
the receiving end is connected with the output end of the analog-to-digital conversion circuit, and the output end is connected with the host computer of the MCU;
the MCU with the control end connected with the first multi-one analog switch and the second multi-one analog switch is used for controlling the channel gating state of the first multi-one analog switch and the second multi-one analog switch under the control of the host.
9. The multi-channel resistance measurement device of claim 7, wherein the analog-to-digital conversion circuit is a data acquisition card;
the reference voltage source is an analog output end of the data acquisition card.
10. The multi-channel resistance measurement device of claim 9, further comprising:
and the reference voltage circuit is respectively connected with the analog output end of the data acquisition card and the first end of each resistor to be tested, and is used for removing noise of the reference voltage output by the analog output end and amplifying the reference voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320648076.XU CN219676144U (en) | 2023-03-24 | 2023-03-24 | Multichannel resistance measuring device |
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| CN202320648076.XU CN219676144U (en) | 2023-03-24 | 2023-03-24 | Multichannel resistance measuring device |
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