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Primary Induced Voltage Waveform Notes
The vertical lines within this trace measured using the ‘X’ cursor, can be seen at 200 volts, in fact it is know that this voltage does measure 250 volts but only a 10x adaptor for the oscilloscope was available at the time of taking this waveform. This is called the induced voltage and is produced by a process called magnetic inductance.
The principal is based around a magnetic field (or flux) being produced when the coil’s negative terminal earth circuit is completed by the amplifier. When the circuit is complete, a magnetic field is produced and builds up until the coil’s magnetic field is maximised. At the point of ignition, the coils earth circuit is removed and the magnetic field or flux collapses across the coil’s windings, which in turn induces a voltage of 150 - 350 volts.
The height of the induced voltage (sometimes referred to as the primary peak volts) will be determined by the following points:-
- The number of turns in the primary circuit.
- The strength of the magnetic flux, which is proportionate to the current in the primary circuit.
- The rate of collapse, which is determined by the speed of the switching of the earth path.
A lower than anticipated induced voltage will result in a low coil output. The High Tension (HT) output will be proportionate to the induced voltage.
Use the settings shown in the example waveform to pre-set the oscilloscope to measure the voltages.
汽車(chē)診斷 | 汽車(chē)診斷儀 | 汽車(chē)故障診斷儀 | 汽車(chē)測(cè)試儀 | 汽車(chē)分析儀 | 汽車(chē)診斷示波器 | 汽車(chē)電路測(cè)試儀 | 汽車(chē)電路分析儀 | 發(fā)動(dòng)機(jī)分析儀 | 發(fā)動(dòng)機(jī)綜合分析儀 | 發(fā)動(dòng)機(jī)檢測(cè)中心 | 點(diǎn)火分析儀 | 點(diǎn)火測(cè)試儀 | 汽車(chē)傳感器測(cè)試儀 | CAN總線(xiàn)示波器 | LIN總線(xiàn)示波器 | 汽車(chē)故障記錄儀 | 汽車(chē)傳感器分析儀 | 汽車(chē)檢測(cè)儀 | 噴油嘴測(cè)試儀 | 點(diǎn)火線(xiàn)圈測(cè)試儀 | 蓄電池測(cè)試儀 | 發(fā)電機(jī)測(cè)試儀 | 起動(dòng)機(jī)測(cè)試儀 | ABS傳感器測(cè)試儀 | ECU測(cè)試儀 | ECM測(cè)試儀 | 進(jìn)氣真空/壓力測(cè)試儀 | 排氣壓力測(cè)試儀 | 汽車(chē)技術(shù)培訓(xùn) | 爆震傳感器測(cè)試儀 | 缺火測(cè)試儀 | 缺缸測(cè)試儀 | 線(xiàn)路測(cè)試儀 | 引出線(xiàn) | 汽車(chē)數(shù)字示波器 | 真空傳感器 | 高壓感應(yīng)測(cè)試頭 | 無(wú)分電器點(diǎn)火測(cè)試頭 | 獨(dú)立點(diǎn)火（COP）感應(yīng)測(cè)試頭 | 漏電測(cè)試儀 | 氣缸相對(duì)壓縮測(cè)試 | 電腦測(cè)試儀 | 發(fā)動(dòng)機(jī)控制器測(cè)試儀 | 泄漏測(cè)試儀 | 熒光檢漏 | 超聲波檢漏 | 汽車(chē)數(shù)字萬(wàn)用表 | 電流鉗表 | 電流勾表 | 點(diǎn)火正時(shí)燈 |
