at present, the electronic components of capacitor
detection method in modern application is more and more widely, electronic components of capacitor detection method is worthy of our study well, now we have a thorough understanding of electronic capacitors capacitance detection method is common way of tag tag directly, its customary units have pF, u F two kinds, it is easy to recognize.
But a few small capacity of capacitance is the digital marking method, there are generally three digits, the first and second digits to be valid, the third digit is multiple, which indicates how much behind with a 0.
For example: 343 said 34000 pf, in addition, if the third digit is 9, 10 - said
1, rather than the 9 10 to the power, for example: 479 4.
Replacing capacitance pressure values of capacitance should be paid attention to the main general requirements is not lower than the original capacitance pressure requirements.
Strict requirement in circuit, its capacity is generally not more than plus or minus 20% of the original capacity.
In less demanding circuit, such as bypass circuit, general requirement is not less than half of the original capacitance and no greater than the original capacity of 2 ~ 6 times.
1 fixed capacitor testing?
A small capacitance detection under 10 pf?
Because 10 pf the following fixed capacitor capacity is too small, use multimeter to measure, only qualitative to check whether there is leakage, its internal short circuit or breakdown phenomenon.
Measurement, can choose multimeter R x 10 k block, two pens and arbitrary by capacitance respectively two pins, resistance should be infinite.
If the measured resistance (
A pointer to the right)
Is zero, then illustrate capacitor leakage internal breakdown or damage.
B to detect 10 ~ 1000 u F pf fixed capacitor charging phenomenon, and then judge the good or bad.
Multimeter use R x 1 k.
Two triode beta are more than 100, and through the current to get some?
Can choose 3 dg6 models of silicon triode pipe etc.
Multimeter of red and black pens and respectively with multiple tube of the emitter and the collector e c.
Due to the amplification effect of compound triode, the measured capacitance charging and discharging process of amplification, the multimeter pointer swing amplitude increase, thus convenient for observation.
Is that should be paid attention to in test operation, especially in the smaller capacity of capacitance measurement, repeatedly measured capacitance pin switch contact with A and B two points, can clearly see the motion of the pointer multimeter.
C for more than 1000 mu F fixed capacity, available multimeter R x 10 k block capacitor test failures directly charging process and presence of internal short circuit or leakage, and according to the range of a pointer to the right size to estimate the capacity of capacitor.
2 electrolytic capacitor
detection because the capacity of electrolytic capacitor is A fixed capacity is much bigger, so the measurement, should according to different capacity to choose the appropriate range.
According to experience, under normal circumstances, the capacitance between 1 ~ 47 u F, R x 1 k block measurement are available, and more than 47 u F R x 100 block measurement of capacitance available.
Electronic component B multimeter red pens and negative, black pens and meet positive, at the moment just contact, multimeter pointer deflection is larger partial degrees to the right (
For the same electric block, the bigger the capacity, the greater the swing)
, then gradually turning to the left until the stop at a particular location.
At this time of the resistance value is positive leakage resistance of electrolytic capacitors, this value is slightly bigger than the reverse leakage resistance.
Practical experience shows that the leakage resistance of the electrolytic capacitor shall generally be in more than a few hundred k Ω, otherwise, can't work normally.
If during the test, the forward and reverse the phenomenon of no charge, whose hands, which shows capacity disappear or internal circuit;
If the measured value is small or zero, capacitor leakage is big or has broken down, cannot be used again.
C for positive and negative sign of unknown electrolytic capacitor, can use the method of measurement of leakage resistance.
The arbitrary measure leakage resistance, first remember its size, and then exchange pens and a resistance is measured.
Two measurement of resistance that is a big positive connection, the black pens and pick up the positive, red pens and pick up is negative.
D use multimeter electric block, using positive and reverse charge for electrolytic capacitor method, according to the size of the oscillation amplitude to the right hand side, can estimate the capacity of electrolytic capacitors.
3 variable capacitor testing A, with the hand gently swirl shaft, should feel very smooth, should not feel sometimes loose tight even have card lag phenomenon.
Carry forward, backward, up, down, left and right when driving in all directions, such as a shaft should not have loose phenomenon.
B, with one hand twisted axis, the other one the outside part of the handle gently touch this little group, should not feel any loose phenomenon.
Axis and poor contact between the variable capacitor, is can't continue to use.
C, universal meter at R x 10 k block, two pens and a hand respectively by variable capacitor piece and piece of terminal, the other hand rotation slowly turn a few back and forth, multimeter pointer should place in infinity.
In the process of the swirl shaft, if the pointer points to zero, sometimes short circuit between moving and fixed pills are point;
If a certain Angle, the multimeter reading for infinity but not appear a certain value, that variable between the rotor plate with fixed leakage phenomenon.
Methods common capacitance tag is the direct sign, its customary units have pF, u F two kinds, it is easy to recognize.
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