Multimeter application tips measuring four

Measuring triode: usually we need R x 1 k Ω,whether NPN transistors or PNP transistors,whether it's in the small power,power,high power tube,measuring its be cb permanent magnet motor node should be presented with diode identical unidirectional conductivity,reverse resistance infinity,the forward resistance around 10 k.In order to further evaluate the pipe features of good or bad,if necessary,also many times should transform the ac induction motor resistance gear measurement,the method is: put R x 10 Ω file to the p-n junction is the resistance measurement are about 200 Ω; Set R x 1 Ω file to the p-n junction is the resistance measurement are about 30 Ω around (above table measured data of 47 type,other type table probably is a bit different,motor run capacitor can test a few more good tube to summarize,accomplish know fairly well) if big reading too much,can be concluded that the characteristics of the pipe is bad.

Still can put table at R x 10 k Ω measured again,the low pressure pipe (triode pressure are basically in more than 30 v),the cb junction reverse resistance should be in the up,but its be junction reverse resistance may have some,the clock will be a slight deflection (generally will not exceed one-third of full scale,varies according to the pressure of the pipe).Similarly,at R x 10 k Ω profile measurement of NPN transistors () or between ec ce (to PNP transistors) resistance,between the clock may be little deflection,but that doesn't mean the pipe is wholesalemotor.blogspot.com bad.But with R x 1 k Ω gear measurement under ce or resistance between ec,header instructions should be infinity,or pipes is a problem.More than that to clear the measurement for silicon tube,the germanium tube shall not apply.But now germanium tube is also very rare.In addition,calls a "reverse" is for p-n junction,direction of NPN and PNP tubes is actually different.