CN208903518U - Resistance C-V characteristic measures apparatus for demonstrating - Google Patents

Abstract

Resistance C-V characteristic measures apparatus for demonstrating, it is related to physics facility technical field, it includes for providing the constant current source module of electric current to test circuit, the resistance test seat being connected in test circuit, the A/D sampling module of resistance both end voltage and the relay for cutting off test circuital current when can acquire current lead-through, resistance test seat is for being removably installed testing resistance, constant current source module, which is connected with, exports the D/A module that electric current is changed for controlling it, D/A module, A/D sampling module and relay are connected to a single-chip microcontroller, when current lead-through, the normally-closed contact of relay remains closed, the constant current source module and test circuit connection, A/D sampling module connecting test circuit is to acquire the voltage at resistance both ends, single-chip microcontroller is fitted simultaneously according to the collected data of A/D sampling module The VA characteristic curve figure of output resistance.The utility model can quickly measure the C-V characteristic of resistance one by one, and easy to operate, error is very small.

Description

Resistance C-V characteristic measures apparatus for demonstrating

Technical field

The utility model relates to physics facility technical fields, and especially a kind of resistance C-V characteristic measurement demonstration fills It sets.

Background technique

As the important component in circuit design, measure to its C-V characteristic is necessary resistance. Basic measurement thinking is, in the case where powering using normal signal source, pressure drop to the resistance both ends of access and passes through stream Electric current through resistance carries out corresponding gradually measurement and measurement data is depicted as curve graph, thus it is apparent that arriving its volt-ampere of spy Property, but this method needs use ammeter and voltmeter, and measuring the result come is influenced that certain mistake can be generated by ammeter Difference causes the result of test unreliable；The time expended when in addition, detecting multiple resistance is longer, and flexibility is inadequate.

Utility model content

Purpose of the utility model is to solve the above-mentioned problems of the prior art, provide a kind of resistance C-V characteristic Apparatus for demonstrating is measured, can quickly measure the C-V characteristic of resistance one by one, and easy to operate, error is very small.

In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution: a kind of resistance C-V characteristic measurement Apparatus for demonstrating, including for test circuit provide electric current constant current source module, be connected to test circuit in resistance test seat, The A/D sampling module of resistance both end voltage and the relay for cutting off test circuital current, institute when can acquire current lead-through Resistance test seat is stated for being removably installed testing resistance and making testing resistance connection test circuit, the constant current source module connects It is connected to and exports the D/A module that electric current is changed for controlling it, the D/A module, A/D sampling module and relay connect It is connected to a single-chip microcontroller, when current lead-through, the normally-closed contact of the relay is remained closed, the constant current source module and test Circuit connection, the A/D sampling module connecting test circuit is to acquire the voltage at resistance both ends, the single-chip microcontroller is according to A/D The VA characteristic curve figure of the collected data fitting of sampling module and output resistance；By the normally-closed contact for making the relay It opens, normally opened contact closure, the test circuit can be made to disconnect with constant current source module, so as to the resistance test seat On resistance replaced.

It preferably, further include one for controlling the keyboard input module of relay, the keyboard input module and monolithic Machine connection.

It is highly preferred that further including one for showing the display of resistance VA characteristic curve figure, the display and list The connection of piece machine.

It is highly preferred that the constant current source module includes AD620 amplifier and OP07 amplifier.

It is highly preferred that the resistance test seat includes pedestal, the two sides of the pedestal are respectively equipped with one can be with test electricity The connecting terminal of road connection offers the jack of the pin for being inserted into testing resistance on the pedestal, is equipped in the jack For the conductive component that the pin with testing resistance contacts, the conductive component is connect with connecting terminal.

The utility model has the beneficial effects that: testing resistance is installed in resistance test seat, can be made before experiment starts Testing resistance connection test circuit, then can start the experiment for carrying out the measurement of resistance C-V characteristic, starter, relay is normally closed Contact remains closed, and tests circuit communication constant current source module and is grounded, A/D sampling module can collect the electricity at resistance both ends at this time Size is pressed, single-chip microcontroller makes it export certain voltage to give constant current source module by control D/A module, and the voltage is according to certain rules Ascending variation and the input as constant current source module, so that the electric current of controllable constant-current source module output also installs a set pattern Ascending variation is restrained, A/D sampling module can collect the electricity at resistance both ends in the case of corresponding size of current in this process Pressure enables single-chip microcontroller to be fitted the positive VA characteristic curve of simultaneously output resistance to obtain the value of multiple groups voltage and electric current Figure.Whole experiment process is easy to operate without using devices such as ammeters into traditional measurement method, and largely subtracts Error is lacked, moreover, since resistance is detachably accepted on resistance test seat, has been carried out to multiple resistance When measurement, it is fast to change the speed torn open, can save a large amount of time, achievees the effect that one by one the quickly positive and negative characteristic of measurement resistance.

Detailed description of the invention

Fig. 1 is the whole principle framework schematic diagram of the utility model；

Fig. 2 is the integrated circuit schematic diagram in embodiment；

Fig. 3 is the structural schematic diagram of resistance test seat in embodiment.

Appended drawing reference are as follows:

1 --- pedestal 2 --- connecting terminal 3 --- jack

4 --- conductive component.

Specific embodiment

For the ease of the understanding of those skilled in the art, the utility model is made below with reference to embodiment and attached drawing further Explanation, the content that embodiment refers to not is restriction to the utility model.

It needs to illustrate in advance, in the present invention unless specifically defined or limited otherwise, term " installation ", The terms such as " connected ", " connection ", " fixation " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachably connect It connects, or is integrally connected；It can be directly connected, can also can be inside two elements indirectly connected through an intermediary Connection.For the ordinary skill in the art, above-mentioned term can be understood in the utility model as the case may be In concrete meaning.

In addition, in the present invention unless specifically defined or limited otherwise, fisrt feature in second feature "upper" or "lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to Cross the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above " One feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First is special Sign is directly below and diagonally below the second feature including fisrt feature under the second feature " below ", " below " and " below ", or only Indicate that first feature horizontal height is less than second feature.Term " on ", "lower", "front", "rear", "left", "right", "vertical", " water It is flat ", "top", "bottom" "inner", the instructions such as "outside" orientation or positional relationship be to be based on the orientation or positional relationship shown in the drawings, It is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must have Specific orientation is constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.

As shown in Figs. 1-2, resistance C-V characteristic measures apparatus for demonstrating, including for providing the constant current of electric current to test circuit Source module, the resistance test seat being connected in test circuit, when can acquire current lead-through resistance both end voltage A/D sampling module And for cut off test circuital current relay, the resistance test seat for be removably installed testing resistance and make to Measuring resistance connection test circuit, the constant current source module, which is connected with, exports the D/A module that electric current is changed, institute for controlling it State D/A module, A/D sampling module and relay and be connected to a single-chip microcontroller, when current lead-through, the relay it is normal Closed contact remains closed, and the constant current source module and test circuit connection, the A/D sampling module connecting test circuit is to adopt Collect the voltage at resistance both ends, the single-chip microcontroller is special according to the volt-ampere of the collected data fitting of A/D sampling module and output resistance Linearity curve figure；By opening the normally-closed contact of the relay, normally opened contact closure, the test circuit and constant-current source can be made Module disconnects, so as to replace to the resistance on the resistance test seat.

The resistance C-V characteristic that above embodiment provides measures apparatus for demonstrating, before experiment starts, by testing resistance (electricity It is R in the schematic diagram of road) it is installed in resistance test seat, testing resistance connection test circuit can be made, then can start to carry out resistance The experiment of C-V characteristic measurement, starter, relay normally closed contact remain closed, and test circuit communication constant current source module and connect Ground, A/D sampling module can collect the voltage swing at resistance both ends at this time, and single-chip microcontroller makes it export one by controlling D/A module Fixed voltage gives constant current source module, the voltage ascending variation and the input as constant current source module according to certain rules, from And the electric current of controllable constant current source module output also installs the ascending variation of certain rule, A/D samples mould in this process Block can collect the voltage at resistance both ends in the case of corresponding size of current, so that the value of multiple groups voltage and electric current is obtained, so that single Piece machine can be fitted and the positive VA characteristic curve figure of output resistance.Whole experiment process is without using arriving traditional measurement method In the devices such as ammeter, it is easy to operate, and largely reduce error, moreover, since resistance is removably It is mounted on resistance test seat, therefore when being measured to multiple resistance, it is fast to change the speed torn open, when can save a large amount of Between, achieve the effect that one by one the quickly positive and negative characteristic of measurement resistance.

It should be noted that single-chip microcontroller is obtained a result by preset program in above-described embodiment, needed for control journey Sequence is very simply that, using technological means commonly used in the prior art, those skilled in the art can easily realize, this reality With the novel improvement being not related to program, therefore do not repeated herein.

It preferably, further include one for controlling the keyboard input module of relay, keyboard input module and monolithic Machine connection, to facilitate experimenter to control relay switching circuit module.

It more preferably, further include one for showing the display of resistance VA characteristic curve figure, display and list The connection of piece machine, can more easily see the resistance VA characteristic curve figure of experimentation output.

More preferably, constant current source module includes AD620 amplifier and OP07 amplifier.

In addition, in the present embodiment, as shown in figure 3, resistance test seat includes pedestal 1, the two sides of pedestal 1 are respectively equipped with one It is a the jack 3 of the pin for being inserted into testing resistance, jack to be offered on pedestal 1 with the connecting terminal 2 of test circuit communication The conductive component 4 contacted for the pin with testing resistance is equipped in 3, conductive component 4 is connect with connecting terminal 2.

Above-described embodiment is the preferable implementation of the utility model, and in addition to this, the utility model can be with other sides Formula realizes that any obvious replacement is in the protection model of the utility model under the premise of not departing from the technical program design Within enclosing.

In order to allow those of ordinary skill in the art more easily understand the improvement of the utility model compared with the existing technology it Place, some attached drawings of the utility model and description have been simplified, and for the sake of clarity, present specification is omitted one A little other elements, the element that those of ordinary skill in the art should be aware that these are omitted also may make up the interior of the utility model Hold.

Claims (5)

1. resistance C-V characteristic measures apparatus for demonstrating, it is characterised in that: including for providing the constant-current source of electric current to test circuit Module, the resistance test seat being connected in test circuit, when can acquire current lead-through resistance both end voltage A/D sampling module with And the relay for cutting off test circuital current, the resistance test seat is for being removably installed testing resistance and making to be measured Resistance connection test circuit, the constant current source module, which is connected with, exports the D/A module that electric current is changed for controlling it, described D/A module, A/D sampling module and relay are connected to a single-chip microcontroller, when current lead-through, the relay it is normally closed Contact remains closed, and the constant current source module and test circuit connection, the A/D sampling module connecting test circuit is to acquire The voltage at resistance both ends, the single-chip microcontroller is according to the collected data fitting of A/D sampling module and the C-V characteristic of output resistance Curve graph；By opening the normally-closed contact of the relay, normally opened contact closure, the test circuit and constant-current source mould can be made Block disconnects, so as to replace to the resistance on the resistance test seat.

2. resistance C-V characteristic according to claim 1 measures apparatus for demonstrating, it is characterised in that: further include one for controlling The keyboard input module of relay processed, the keyboard input module are connect with single-chip microcontroller.

3. resistance C-V characteristic according to claim 2 measures apparatus for demonstrating, it is characterised in that: further include one for showing Show that the display of resistance VA characteristic curve figure, the display are connect with single-chip microcontroller.

4. resistance C-V characteristic according to claim 3 measures apparatus for demonstrating, it is characterised in that: the constant current source module packet Include AD620 amplifier and OP07 amplifier.

5. resistance C-V characteristic described in any one of -4 measures apparatus for demonstrating according to claim 1, it is characterised in that: described Resistance test seat includes pedestal (1), and the two sides of the pedestal (1) are respectively equipped with one can be with the connecting terminal of test circuit communication (2), the jack (3) of the pin for being inserted into testing resistance is offered on the pedestal (1), is equipped with and is used in the jack (3) The conductive component (4) contacted with the pin of testing resistance, the conductive component (4) connect with connecting terminal (2).