The complexity of the test capacitor
When measuring the capacitance of the capacitor on the Board without preliminary dismantling problems. The capacitor is always included in the circuit and can coexist on the PCB with other circuit elements. Particularly affect the capacitance of the transformer windings, inductor, fuses - they have a small DC resistance.
Therefore, you must ensure that the circuits of the measured capacitor is no influence of such elements. If circuits with capacitor included a transistor or diode, then when measuring it is possible to see the deflection to a certain position and drop to a certain value equal to the resistance of the transitions of the semiconductor. And if there is no short circuit, the capacitor may be defective.
When you touch the probes of the multimeter to the capacitor is supplied a constant current from the tester. The capacitor will charge, and the resistance gradually increase.
On the electronic tester value will grow from negative or positive values to one indicating a resistance that exceeds the measuring range selected by the shift knob. After permutation of the probes of the tester places the capacitor must be recharged, the device needs to act as well.
On the deflection dial of the multimeter by connecting a capacitor and return it to its original position can be seen in a scale the maximum deviation.
If you swap the probes, the meter pointer must deflect to maximum and gradually fall to their original position. After the need to take similar and known-good capacitor and if the pointer of the tester on the control element is deflected more, check the condenser outside.
If the measurement and compliance of the pros and cons on the tester and terminals of the capacitors the instrument will show the resistance, then the condenser is faulty.
Check condenser other devices
There are devices which you can check the capacitors directly on the Board. Such devices operate on low voltages to reduce the risk of disabling other elements.
It is possible to manufacture the attachment to the tester on the schemes published in magazines and on the Internet. But not always it is possible to measure accurately due to the effect of other circuit elements. For example, several parallel capacitors at the end will show the total capacity.
Advice 2: How to check capacitor
For this you need to make sure that the spark plugs produce the spark, by means of which the ignition of the fuel mixture in the engine cylinder. If one or more candles give a weak spark is red or uneven appearance, you need to pay attention to the work distributor, which is also called the distributor (from the French "trembleur" which means "breaker").
The new models of cars instead of the mechanical distributor is an electronic switch that in the event of failure changes as a whole. To discover the cause of the unstable operation of the distributor, it is necessary to remove the cover, which is made of hard rubber. In the lid during operation can cause micro cracks, which enters the dust and dirt that causes breakouts in the electric circuit, and a voltage is supplied to the spark plug. After inspection cover need to pay attention to the gap between the breaker contacts. You should also check the condenser in the distributor. If the gaps are normal, but when there is a strong sparking, then the problem is in the condenser. To test it you will need an ammeter.
If you connect the device to the pins, turn the ignition on and hand break contacts in the timer. Observe the indication arrows of the ammeter. If the arrow or the numeric value on the screen closer to zero position, discharge 2-4A, there is a fault in the capacitor and should be replaced.
You can also check the capacitor on their own, when there is suspicion of breakdown to ground. This will require a portable automobile light bulb. First you need to disconnect the wire of the ignition coil along with the condenser wire from the clip circuit breaker and to connect thereto a portable light bulb. At ignition on the lamp should not illuminate. If it burns, it says that the capacitor is defective.
There is another capacitor in the ignition system of the vehicle. It is located in the generator and is designed to reduce interference in the radio. Motorists older remember the radios in the cars reacted to a loud noise on passing trucks and old cars. Today, all generators are mandatory equipped with a condenser.
Advice 3: How to check the capacitor on the performance
- - portable lamp;
- - ohmmeter