1, detection A small power diode module, judging positive and negative electrode (
Sign marks, observing on the shell.
Usually on the shell of diode with diode symbol, with one end of the triangle arrows for positive, on the other side is negative.
And observe color point on the shell.
On point diode shell, usually marked with color polarity point (
White or red)
One end of the general marked with color point is positive.
There are marked on the diode of color ring, with one end of the color wheel is negative.
, will be subject to a measured resistance small, black pens and pick up by the end of the anode, the red pens and connect one end of the cathode.
B, high detection Zui working frequency fM.
Working frequency of the crystal diode, in addition to check out from the relevant characteristics and practical commonly used eyes look inside the diode contact wire to distinguish, such as point-contact diode belongs to the high frequency tube, surface contact type diode for low frequency tube.
In addition, also can use a multimeter R×
1 k test, general forward resistance less than 1 k more for the high frequency tube.
C, high detection Zui VRM reverse breakdown voltage.
For alternating current (ac), because of the constantly changing, so Zui reverse voltage is diode work under high peak voltage.
It should be pointed out that, Zui high reverse voltage is not the breakdown voltage of diode.
In general, the breakdown voltage of diode reverse working voltage is much higher than Zui (
About twice as high)
2, inspection glass sealed silicon high-speed switching diode silicon high-speed switching diode at the same method with common diode detection method.
The difference is that this kind of pipe is bigger resistance.
1 k electric block measurement, generally positive resistance for 5 ~ 10 k k, reverse resistance to infinity.
3, detection, fast recovery, super fast recovery diode with a multimeter test fast recovery, super fast recovery diode method basic same as the method to measure the encapsulation of silicon rectifier diode.
Use first R× namely;
1 k block check the unidirectional conductivity, generally positive resistance of 4.
Has infinite resistance around 5 k, reverse;
1 block of retest once, generally positive resistance for several European, reverse resistance remains to infinity.
4, test A and puts A multimeter R× bidirectional trigger diode;
1 k block, measuring the bidirectional trigger diode is, reverse resistance value should be infinite.
If the exchange of pens and measure, multimeter swing to the right hand side, measured tube indicate the leakage fault.
Put a multimeter in the corresponding dc voltage.
The test voltage is provided by megohmmeter.
Test, shaking megohmmeter, the voltage value indicated by the multimeter is measured VBO value of the pipe.
And then transfer the two pins of the measured pipe, use the same method to measure the VBR values.
Finally will VBO comparing with VBR, unique to the difference between the values of the two is smaller, that measured the symmetry of the bidirectional trigger diode, the better.
5, transient voltage suppression diode (
The detection of A, use multimeter R×
The stand or fall of 1 k in measuring pipe for unipolar TVS, in accordance with the method of measuring the common diode, can measure the positive and reverse resistance, generally positive resistance is about 4 k Ω, reverse resistance to infinity.
For bidirectional type TVS, arbitrarily change the red, black pens and measuring the resistance value between the two pins are for infinity, otherwise, the tube performance is bad or damaged.
Zhejiang rectifier co. , LTD. , the production of various kinds of specifications models of thyristor
module, thyristor module, solid state relay module, rectifier bridge module, such as supporting the radiator products, sincerely look forward to the cooperation with various companies and procurement staff, to provide affordable, quality and reliable electronic components.
Consultation telephone: 0577 -
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