CN201464567U

CN201464567U - Electric charge tester

Info

Publication number: CN201464567U
Application number: CN2009201277317U
Authority: CN
Inventors: 周光明
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-19
Filing date: 2009-06-19
Publication date: 2010-05-12
Anticipated expiration: 2019-06-19

Abstract

The utility model relates to an electric charge tester, in particular to a device capable of recognizing positive and negative electric charges, which comprises a current meter, a field effect transistor, a potentiometer and a power supply, wherein one end of the current meter is electrically connected with a source of the field effect transistor; a drain of the field effect transistor is electrically connected with the power supply; and a grid of the field effect transistor serves as a detection electrode. The electric charge tester uses the grid of the field effect transistor to detect electric charges. When a tested object has positive electric charges or negative electric charges, an indicator of the current meter can deflect towards different directions, and then a user can use the tester to determine whether the electric charges are positive or negative, and the test result is visual. Simultaneously, the electric charge tester utilizes electric charge structures, is less affected by external environmental factors, and has steady performance.

Description

The electric charge electroscope

Technical field

The utility model relates to a kind of device that detects electric charge, is specifically related to a kind of device of discerning positive and negative electric charge.

Background technology

Traditional device that is used for charge detection is a physical construction at present, usually repel mutually by like charges, the principle that the xenogenesis electric charge attracts each other detects, this pick-up unit is subjected to such environmental effects such as temperature, humidity and extraneous vibration bigger, testing result is also directly perceived inadequately simultaneously, when using as instruments used for education, the student is difficult to see clearly test findings especially.In addition, traditional charge detection instrument can't be discerned positive and negative electric charge.

The utility model content

In view of this, in order to address the above problem, the utility model provides a kind of can discern positive and negative electric charge, and testing result is the electric charge electroscope intuitively.

The purpose of this utility model is achieved in that the electric charge electroscope, comprise galvanometer, fet, potentiometer and power supply, a described galvanometric end is electrically connected with the source electrode of fet, the drain electrode of fet is electrically connected with power supply, and the grid of fet is as exploring electrode.

Further, also be connected with adjustable resistor device between the drain electrode of fet and the power supply;

Further, described adjustable resistor device is a potentiometer;

Further, described potentiometer is selected the potentiometer of 2K Ω or 4.7K Ω;

Further, described electric current is counted a milliampere level reometer gauge outfit;

Further, described fet is selected from a kind of among K168, K163 and the 2K184.

Electric charge electroscope of the present utility model, grid by fet is surveyed electric charge, when measured object has positive charge or negative charge, galvanometric pointer can be to different directions deflection, and distinguishable measured object institute is charged positive and negative, and testing result is also directly perceived as seen, simultaneously, this device adopts electronic structure, is subjected to the external environment factor affecting little, stable performance.

Other advantages of the present utility model, target, to set forth in the following description to a certain extent with feature, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can from practice of the present utility model, obtain instruction to investigating hereinafter.Target of the present utility model and other advantages can be passed through following instructions, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.

Description of drawings

In order to make the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 shows the galvanoscopic electrical block diagram of electric charge.

Embodiment

Hereinafter with reference to accompanying drawing, preferred embodiment of the present utility model is described in detail.

Referring to Fig. 1, the electric charge electroscope of present embodiment, comprise galvanometer 1, fet 2, potentiometer 3 and power supply 4, one end of described galvanometer 1 is electrically connected with power supply 4, the other end is electrically connected with the source electrode (the S utmost point) of fet 2, the drain electrode of fet 2 (the D utmost point) is electrically connected with power supply, and the grid of fet 2 (the G utmost point) is as exploring electrode; Described galvanometer 1 is selected a milliampere level reometer gauge outfit for use, in order to adjust milliampere initial position of level reometer meter pointer, also be connected a potentiometer 3 between the drain electrode (the D utmost point) of fet 2 and power supply, described potentiometer is selected the potentiometer of 2K Ω or 4.7K Ω; Described fet is selected from a kind of among K168, K163 or the 2K184; Power supply 4 uses button cell; For easy to use, also a K switch can be set.

Present embodiment in use, regulator potentiometer, the pointer of reometer gauge outfit is referred in Centromedian position, then with the close object under test of galvanoscopic grid (the G utmost point), if object under test has electric charge, then pointer can deflect, as presses the connected mode (galvanometric positive pole is electrically connected with the source electrode (the S utmost point) of effect triode) among Fig. 1, then pointer deflection left when object under test is electronegative, pointer deflection to the right when object under test is positively charged.

The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and obviously, those skilled in the art can carry out various changes and modification and not break away from spirit and scope of the present utility model the utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.

Claims

1. electric charge electroscope, it is characterized in that: comprise galvanometer, fet, potentiometer and power supply, a described galvanometric end is electrically connected with the source electrode of fet, and the drain electrode of fet is electrically connected with power supply, and the grid of fet is as exploring electrode.

2. electric charge electroscope as claimed in claim 1 is characterized in that: also be connected with adjustable resistor device between the drain electrode of fet and the power supply.

3. electric charge electroscope as claimed in claim 2 is characterized in that: described adjustable resistor device is a potentiometer.

4. electric charge electroscope as claimed in claim 3 is characterized in that: described potentiometer is selected the potentiometer of 2K Ω or 4.7K Ω.

5. electric charge electroscope as claimed in claim 1 is characterized in that: described electric current is counted a milliampere level reometer gauge outfit.

6. as each described electric charge electroscope in the claim 1 to 5, it is characterized in that: described fet is selected from a kind of among K168, K163 and the 2K184.