CN2106374U

CN2106374U - Electron megohm-multitester

Info

Publication number: CN2106374U
Application number: CN 91209909
Authority: CN
Inventors: 倪敏禄
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-06-12
Filing date: 1991-06-12
Publication date: 1992-06-03

Abstract

The utility model relates to a combined type instrument-an electron megohm multimeter which can measure the insulation resistance and which has all the functions of a multimeter. The utility model is formed by that two blocking positions measuring high resistance are is additionally arranged in the present multimeter, while an electronic changing device, of direct-current voltage, which is additionally arranged in the present multimeter provides power for the two blocking positions of the high resistance. The method used by the instrument of the utility model to measure the insulating high resistance is identical with the method used by the ordinary multimeter. The appearance of the instrument of the utility model has little distinction with the appearance of the ordinary multimeter, and can replace the megohmmeter to be convenient for the use of electrical workers.

Description

Electron megohm-multitester

The utility model belongs to physics measurement instrument technical field, ICL GOIR27/02.

The insulation resistance of measuring electrical equipment, equipment and circuit all uses megger at present, claims megohmmeter or megger again.

It mainly is made up of than meter hand generator and magnetoelectricity system, is example with 5050 types that often use at present.The output voltage of its generator is 500 volts of direct currents, and measurement range is 1～50M Ω comparatively accurately, the about 2kg of weight, the about 170 yuan/platform of price.It is as follows that it has more defective:

1, purposes is single, can only measure high resistance, and measurement range is too narrow;

2, the general multimeter of weight ratio is all big, carries inconvenience;

3, it is very inconvenient to compare use with multimeter, and the operator must continuously shake generator with 120 rev/mins speed.Therefore often need operation in double harness;

4, the generator of megger and machinery thereof in addition parts damage easily, and the output voltage of generator is very unstable, the normal allowed band of its voltage is up to ± 20% usually, and the megger that uses in the reality is because various faults also often surpass ± 20% requirement;

5, the sensitivity of logolmeter is lower, and reliability, spoilage are all poor than common permanent-magnet moving coil instrument, and its working current is bigger, the power of parts such as then necessary again corresponding increase resistance and power supply.

The utility model is improved, and is designed at the existing problem of above-mentioned megger, at first megger is measured the high resistant function and is added on the multimeter.Its principle of measuring high resistant is identical with multimeter, and promptly two grades of the resistance grade increase X100K of multimeter commonly used and XIM, electric repair work personnel need only have this table just can replace megger and multimeter like this.Multimeter resistance grade power supply secondly commonly used is the highest only 22.5 volts, is used to measure then insufficient sensitivity of high resistance, must improve supply voltage.The design casts out Dyn., and adopts an electronics DC boosting device, and it utilizes a kind of sense trifocal oscillatory circuit, the alternating voltage that it produced is boosted, yet export dc high voltage through rectification again.This circuit can be exported 300～500 volts DC voltage as required, uses for the high resistant shelves.The power supply of dc converter adopts No. 5 batteries of 4 joints, and with multimeter low-resistance shelves power sharing.The volume of package unit is very little, can be installed among the multimeter of present use reliable operation fully.

The attainable effect of the utility model is: multi-functional, light, easy to use, effective, precision is high, cost is low, tangible advantage such as not fragile grade has two functions of megohmmeter and multimeter concurrently.

Accompanying drawing is the embodiment after reequiping with 106 type multimeters, and its measurement range can reach:

1, resistance grade: totally six grades, measurement range is from 1～100M Ω;

2, DC current shelves: be total to fourth gear, measurement range is from 0.1mA～500mA;

3, shelves of direct voltage: be total to fourth gear, measurement range is from 0.5V～2500V;

4, alternating voltage shelves: be total to fourth gear, measurement range is from 0.5V～2500V.

Be electronics DC boosting device in the dotted line in the accompanying drawing, its power supply switches by the KA double-point double-throw switch.All the other partly are 106 type multimeter circuits, but slightly change on the gear, and the utility model is equally applicable to the repacking of other various multimeter circuits.

Claims

1, a kind of electronics megaohm-multimeter, by gauge outfit, switch, shunting and dropping resistor, formations such as power supply, profile and the multimeter basically identical that uses now is characterized in that: the insulation of measurement high resistant gear is arranged, and the power supply of surveying insulation high resistant gear is provided by electronics dc voltage conversion device, surveys the power sharing of low resistance shelves in the power supply of electronics dc voltage conversion device and the instrument.

2, electronics megaohm according to claim 1---multimeter is characterized in that: the power supply of the power supply of electronics dc voltage conversion device and the low-resistance shelves of multimeter, switch by both sides' switch.

3, electronics megaohm according to claim 1---multimeter is characterized in that: electronics dc voltage conversion device is installed in the instrument, and isolates with insulation course between the instrument other parts.