CN208224343U

CN208224343U - Pin type demonstrates multimeter

Info

Publication number: CN208224343U
Application number: CN201820726863.0U
Authority: CN
Inventors: 洪子卓
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-05-16
Filing date: 2018-05-16
Publication date: 2018-12-11
Anticipated expiration: 2028-05-16

Abstract

The utility model discloses a kind of pin types to demonstrate multimeter, including multimeter main body, is provided with pointer, range, binding post on the shell of multimeter main body；The interior of shell of the multimeter main body includes angular transducer, deceleration small machine, voltage comparator circuit and power voltage step down rectification circuit, and 220 power supplys of access are converted into the 5V DC power supply to work for access voltage comparator circuit by the power voltage step down rectification circuit；The voltage comparator circuit is connected with deceleration small machine, and to drive deceleration small machine, the power output end of the deceleration small machine is connected by runner and transmission rubber strip with pointer.The utility model uses deceleration small machine, angular transducer and voltage comparator circuit composition；Meanwhile being made dial plate, pointer greatly, the student for being sitting in classroom back can be made to see reading clearly.

Description

Pin type demonstrates multimeter

Technical field

The utility model belongs to physics, Scientific Teaching instrument class technical field, particularly relates to pin type demonstration multimeter.

Background technique

Pin type with table is physics, main with table in scientific experiment teaching, and current electromagnetic type demonstrates multimeter, dial plate Small, the student in classroom back does not see reading.Due to the ammeter structure of electromagnetic type, it is difficult pointer being made big.

Summary of the invention

The utility model makes up the deficiencies in the prior art aiming at the above problem, provides a kind of pin type demonstration multimeter； The internal structure of the pin type demonstration multimeter of the utility model uses deceleration small machine, angular transducer and voltage comparator circuit Composition；Meanwhile being made dial plate, pointer greatly, the student for being sitting in classroom back can be made to see reading clearly.

To achieve the above object, the utility model adopts the following technical solution.

A kind of pin type of the utility model demonstrates multimeter, including multimeter main body, is provided on the shell of multimeter main body Pointer, range, binding post；It is characterized by: the interior of shell of the multimeter main body includes angular transducer, slow down small electricity 220 power supplys of access are converted by mechanical, electrical pressure comparison circuit and power voltage step down rectification circuit, the power voltage step down rectification circuit For the 5V DC power supply of access voltage comparator circuit work；The voltage comparator circuit is connected with deceleration small machine, to Deceleration small machine is driven, the power output end of the deceleration small machine is connected by runner and transmission rubber strip with pointer.

As a kind of preferred embodiment of the utility model, the voltage comparator circuit by three models of the same race four high guaily unit Chip, the 10K resistance being connected with the input terminal of the four high guaily unit chip, power conversion chip and four models of the same race three poles Pipe composition.

As a kind of preferred embodiment of the utility model, the four high guaily unit chip is using the four of model LM358 Amplifier chip, triode of the triode using model 8550, the model that the power conversion chip uses It is 7660.

As a kind of preferred embodiment of the utility model, the electric quantity output end and voltage of the power voltage step down rectification circuit The input terminal of first four high guaily unit chip of comparison circuit, a pin of power conversion chip are connected, first four high guaily unit core The output end of piece passes through 10K resistance respectively and is connected with the input terminal of second four high guaily unit chip, third four high guaily unit chip, and second A four high guaily unit chip, third four high guaily unit chip output end be connected with the circuit that four triodes form, four triode groups At circuit be connected with deceleration small machine.

As a kind of preferred embodiment of the utility model, the power voltage step down rectified current routing transformer and rectifier bridge structure At.

As a kind of preferred embodiment of the utility model, the shell of the multimeter main body is had using batten and macromolecule The production of machine plate, is sticked with the last 500 all-purpose adhesive.

As another preferred embodiment of the utility model, the size of the shell of the multimeter main body be 50cm × 60cm。

The beneficial effects of the utility model.

1, a kind of pin type provided by the utility model demonstrates multimeter, this teaching aid drives needle using deceleration small machine Formula demonstrates general-purpose list index, while demonstration multimeter being made greatly, and the student for being sitting in classroom back can be made to see reading clearly.This religion The measurement accuracy of tool can reach 2.5%, be the precision of small-sized needle type universal meter.

2, the pin type demonstration multimeter of the utility model has the advantages that (1), using a kind of Novel structure, solves Electromagnetic type demonstration multimeter is difficult to do big problem, increases demonstration visibility；(2), this table structure is simple, is easy to make, and makes Valence is low, and debugging is easy.

Detailed description of the invention

The technical issues of in order to keep the utility model solved, technical solution and beneficial effect are more clearly understood, below In conjunction with the drawings and the specific embodiments, the present invention will be further described in detail.It should be appreciated that tool described herein Body embodiment is only used to explain the utility model, is not used to limit the utility model.

Fig. 1 is a kind of overall appearance structural representation of pin type demonstration multimeter of the utility model.

Fig. 2 is a kind of circuit diagram of the voltage comparator circuit of pin type demonstration multimeter of the utility model.

Fig. 3 is a kind of circuit diagram of the power voltage step down rectification circuit of pin type demonstration multimeter of the utility model.

Marked in the figure: 1 being range, 2 being pointer, 3 be multimeter main body, 4 being binding post.

Specific embodiment

In conjunction with shown in attached drawing, a kind of pin type of the utility model demonstrates multimeter, including multimeter main body 3, multimeter main body Shell on be provided with pointer 2, range 1, binding post 4；It is characterized by: the interior of shell of the multimeter main body 3 includes Angular transducer, deceleration small machine, voltage comparator circuit and power voltage step down rectification circuit, the power voltage step down rectification circuit will The 5V DC power supply that 220 power supplys of access are converted into for access voltage comparator circuit work；The voltage comparator circuit with Deceleration small machine is connected, and to drive deceleration small machine, the power output end of the deceleration small machine passes through runner and transmission Rubber strip is connected with pointer.

As a kind of preferred embodiment of the utility model, the shell of the multimeter main body 3 uses batten and macromolecule Organic plates production, is sticked with the last 500 all-purpose adhesive.

As another preferred embodiment of the utility model, the size of the shell of the multimeter main body 3 be 50cm × 60cm；This size can make multimeter main body 3 itself very big, and being able to satisfy, which makes to be sitting in the student of classroom back, sees reading clearly.

The structure of this teaching aid of the utility model uses deceleration small machine, angular transducer and voltage comparator circuit group At principle is: angular transducer corresponds to different voltage in different angles, it and tested voltage are compared, and passes through Voltage comparator circuit, if angle-sensor voltage is lower than measured voltage, deceleration small machine machine is rotated forward, and 2 angle of pointer becomes larger；Instead It, pointer reversion, 2 angle of pointer becomes smaller, and when angle-sensor voltage is equal to measured voltage, deceleration small machine does not turn, and pointer 2 is right The angle answered shows measured voltage value.

The service condition of the utility model: teaching aid is applied to classroom instruction, and phenomenon is obvious, and the study for exciting student is emerging Interest, by teachers and students' favorable comment.

It is understood that being merely to illustrate the utility model above with respect to the specific descriptions of the utility model and not being It is limited to technical solution described in the utility model embodiment, those skilled in the art should understand that, it still can be with It modifies to the utility model or equivalent replacement, to reach identical technical effect；Needs are used as long as meeting, all in this reality Within novel protection scope.

Claims

1. pin type demonstrates multimeter, including multimeter main body, pointer, range, binding post are provided on the shell of multimeter main body； It is characterized by: the interior of shell of the multimeter main body include angular transducer, deceleration small machine, voltage comparator circuit and 220 power supplys of access are converted into comparing for access voltage by power voltage step down rectification circuit, the power voltage step down rectification circuit The 5V DC power supply of circuit work；The voltage comparator circuit is connected with deceleration small machine, to drive deceleration small machine, institute The power output end for the deceleration small machine stated is connected by runner and transmission rubber strip with pointer.

2. pin type according to claim 1 demonstrates multimeter, it is characterised in that: the voltage comparator circuit is same by three The kind four high guaily unit chip of model, the 10K resistance being connected with the input terminal of the four high guaily unit chip, power conversion chip and four The triode of model of the same race forms.

3. pin type according to claim 2 demonstrates multimeter, it is characterised in that: the four high guaily unit chip is using type Number four high guaily unit chip for being LM358, for the triode using the triode of model 8550, the power supply converts core The model 7660 that piece uses.

4. pin type according to claim 2 demonstrates multimeter, it is characterised in that: the electricity of the power voltage step down rectification circuit Amount output end is connected with a pin of the input terminal of first four high guaily unit chip of voltage comparator circuit, power conversion chip, The output end of first four high guaily unit chip passes through 10K resistance and second four high guaily unit chip, third four high guaily unit chip respectively Input terminal is connected, the circuit phase that forms with four triodes of output end of second four high guaily unit chip, third four high guaily unit chip Even, the circuit of four triodes composition is connected with deceleration small machine.

5. pin type according to claim 1 demonstrates multimeter, it is characterised in that: the power voltage step down rectified current routing variable Depressor and rectifier bridge are constituted.

6. pin type according to claim 1 demonstrates multimeter, it is characterised in that: the shell of the multimeter main body uses Batten and the production of macromolecule organic plates, are sticked with the last 500 all-purpose adhesive.

7. pin type according to claim 1 demonstrates multimeter, it is characterised in that: the ruler of the shell of the multimeter main body Very little is 50cm × 60cm.