How do I use a multimeter to check the ignition coil on a car?
1, the multimeter can only measure its on-off, resistance value for reference. But most of the ignition coil failure is a turn-to-turn short circuit (high-voltage breakdown), the multimeter can not be measured, you can also use the battery power to instantaneously turn on the input (primary), the output will be high-voltage output (secondary).
2, the multimeter can measure the resistance of the two high-voltage end, but can not judge the fault of the ignition coil.
3,Independent ignition coil plug voltage value between the terminals due to the coil is not the same, can not determine the good or bad ignition coil.
4, any coil has a secondary coil and primary coil, used in the distributor coil are a high-voltage head output, and then divided into individual cylinders up.
Multimeter structure composition:
1, the meter head:
The head of the multimeter is a sensitive ammeter. The dial on the head is printed with a variety of symbols, scales and values.
Symbol A a V a Ω that the meter is a multi-purpose meter can measure current, voltage and resistance. The dial is printed on a number of scales, the right end of which is marked "Ω" is the resistance scale, the right end of which is zero, the left end of the ∞, the distribution of scale values is uneven.
Symbol "-" or "DC" means direct current, "~" or "AC " indicates AC, and "~" indicates a scale line shared by AC and DC. The lines of numbers under the scale line are the scale values corresponding to the different gears of the selector switch.
There is also a mechanical zero adjustment knob on the head of the meter to correct the zero position of the pointer at the left end.
2, selector switch:
Multimeter selector switch is a multi-position rotary switch. Used to select the measurement items and ranges. General multimeter measurement items include: "mA"; DC current, "V (-): DC voltage, "V (~)": AC voltage, "Ω": resistance. Each measurement item is divided into several different ranges to be
for selection.
3, the pen and the pen jack:
Meter pen is divided into red, black two. When using the red pen should be inserted into the jack marked "+", the black pen into the jack marked "-".
4,Meter head (pointer type):
It is a high sensitivity magnetoelectric DC ammeter, the main performance indicators of the multimeter basically depends on the performance of the head. The sensitivity of the head refers to the DC current value flowing through the head when the pointer of the head is deflected to full scale, the smaller this value is, the higher the sensitivity of the head is. The greater the internal resistance when measuring voltage, the better its performance.
