Measurement techniques for five multimeter application skills

 Now most common triode is powder coating,how to accurately judge the triode three pin which is b,c,e? Triode b very easily measured,but how to judge which is c which is e? Here recommends three methods: the first method: for measuring triode hFE jack pointer table,first measure b pole,throw triode plug into motor vehicle spare parts the socket (b,of course,is very can plug accurate),measure hFE value,then the measuring tube upside down again,the measured values of hFE larger one,each pin insertion position is correct.The second method: to measure without hFE jack table,or is not convenient to insert the socket pipe is too big,can use this method: of NPN transistors,first measure b (the pipe is NPN and PNP b and its feet are easy to measure,isn't it?) ,put table in R x 1 k Ω gear,to connect the red pens and hypothetical e very (note that take the hand don't run into table of red pens and pen or pin),the fan motor black pens and answer the hypothetical c,at the same time hold the table with his fingers tip and the pin,will pick up the pipe,with the tip of your tongue lick a b,the header pointer should have a certain amount of deflection,if all the pens and you answer correctly,the pointer will be bigger,if wrong,the pointer will be smaller,the difference is obvious.

Which can determine pipe c and e.For PNP transistors to black pens and answer the hypothetical e very (hand don't touch the tip or pin),red pens and answer the hypothetical c,at the same time hold the table with his fingers tip and the pin,and then use the tip of the tongue lick a b,if the pens and correctly,header pointer will deflection is larger.Of course when measuring the pens and to discuss the test twice,comparative reading before final decision.This method applies to all appearance triode,convenient and practical.According to the clock deflection amplitude,but also can estimate the pipe amplification ability,of course it is by experience.The third method: first to determine the pipe after the NPN and PNP type a and b,put table at R x 10 k Ω,of NPN transistors,the black pens and connect e,red pens and pick up c extremely,the clock may have some deflection,the PNP transistors,electricalmotor1.blogspot.com black pens and c extremely,red pens and pick up e very,whose hands may have a certain amount of deflection,which in turn would have deflection.This can also determine triode c and e.But for the high pressure pipe,this method is not applicable.

To identify U V W three-phase power often use colors to distinguish,U V W three-phase color,why?

Our country is:B for yellow,yellow,green and red A phase B phase for the green,phase C to red,neutral line (i.e.,zero) for light blue,protect the neutral line (ground) as the yellow and green double color Three-phase power supply how fork receiver method how to distinguish between ABC three brake rotor phase and ground wire? Phase color logo is:A phase for yellow;B phase for the electric motors 12 volt green;C phase in red.Or directly indicate the ABC phase.Ground zero line is blue,for double color line under normal circumstances,the plug or the wholesalemotor.blogspot.com socket

four conductive body,there is a show 90 degrees with other electrical conductor (sheet),whether it is a flake single phase asynchronous motor or columnar,the grounding end is longer than the other three,coarse.

The market situation

High efficient motor Y series ac asynchronous motor replacing JO2 motor basic models without

limit,thus,all used the occasion of ac asynchronous motor Y series can be used Replace the JO2 series motor.Yx series motor market potential is restricted by its capacity.In principle,below 90 kw ac asynchronous motor can by Yx series high efficient electricity Machines replaced.90 kw ac asynchronous motor installed capacity of the following accounts for about 30% of the total ac asynchronous motor.In recent ten years,the Chinese government is committed to promoting motor drive technology,all walks of life to www.dongfeng-motor.com some extent,the motor drive.According to the oil,electricity,building materials,steel Iron,non-ferrous,coal,chemical industry,paper making,textile and other departments recently sampling survey results of the enterprise,the petroleum chemical industry,building materials,motor drive application is better.In the current 400 million KW motor load,is about 50% of load change,30% of which can be to solve the problem of the load changes motor speed.So in the current market capacity,There are about 60 million kW of speed regulating motor market.All kinds of motor installed capacity in China has been more than 400 million kW,which accounted for about 90% of the asynchronous motor,accounted for about 80% of small and medium-sized motor,Drag the water pump centrifugal pump and fan about 130 million kW compressor motor of such a machine.At present,small and medium-sized motor has more than 152 series,842 varieties,more than 4000 specifications.In the last ten Over the years,industrial machinery,such as the relevant departments to grasp the energy-

saving work of the motor,organizational leadership institute and enterprises,has made a variety of energy-saving motor design,and Has issued out 63 energy-intensive motor and promotional 24 kinds of energy-saving motor,achieved some results.These energy saving products are mainly divided into two

categories: one kind is to improve the electricity Incentive efficiency of high efficiency

motor,another kind is adjustable speed motor.Dc motor using the octagonal laminated structure,not only high space utilization,and when using static rectifier power supply,can withstand the current ripple and fast load Current changes.General without motor fan series dc motor winding,is suitable

for the need of positive and reverse automatic control technology.According to user needs can also be made with series winding. High center 100 ~ 280 mm motor without compensation winding,but the center height of 250 mm,250 mm motor according to the specific circumstances and needs can be made into with compensating winding,high center 315 ~ 450 mm motor with the compensation winding.Center height of 500 ~ 710 mm motor installation appearance,size and technical requirements are in conformity with IEC international standard.