 |
This is a good waveform |
 View larger image
 Download this waveform file for use with PicoScope
Alternator Voltage and Current (AC Coupled) Waveform Notes
The example waveform illustrates the rectified output from the alternator.
The contents of this waveform shows:-
- The output is correct and that there is no fault within the phase windings or the diodes (rectifier pack).
- The three phases from the alternator have been rectified to Direct Current (DC) from its original Alternating Current (AC) and that the three phases that contribute towards the alternators output are all functioning.
If the alternator was suffering from a diode fault, long downward ‘tails’ will appear from the trace at regular intervals and 33% of the total current output will be lost. A fault within one of the three phases will show a similar picture to the one illustrated but is three or four times the height, with the base to peak voltage in excess of 1 volt.
The voltage scale at the side of the oscilloscope is not representative of the charging voltage, but is representative of the upper and lower limits of the DC ripple. The ‘amplitude’ of the waveform will vary under different conditions with a full charged battery showing a ‘flatter’ picture, while a discharged battery will show an exaggerated amplitude until the battery is charged.
汽车诊断 | 汽车诊断仪 | 汽车故障诊断仪 | 汽车测试仪 | 汽车分析仪 | 汽车诊断示波器 | 汽车电路测试仪 | 汽车电路分析仪 | 发动机分析仪 | 发动机综合分析仪 | 发动机检测中心 | 点火分析仪 | 点火测试仪 | 汽车传感器测试仪 | CAN总线示波器 | LIN总线示波器 | 汽车故障记录仪 | 汽车传感器分析仪 | 汽车检测仪 | 喷油嘴测试仪 | 点火线圈测试仪 | 蓄电池测试仪 | 发电机测试仪 | 起动机测试仪 | ABS传感器测试仪 | ECU测试仪 | ECM测试仪 | 进气真空/压力测试仪 | 排气压力测试仪 | 汽车技术培训 | 爆震传感器测试仪 | 缺火测试仪 | 缺缸测试仪 | 线路测试仪 | 引出线 | 汽车数字示波器 | 真空传感器 | 高压感应测试头 | 无分电器点火测试头 | 独立点火（COP）感应测试头 | 漏电测试仪 | 气缸相对压缩测试 | 电脑测试仪 | 发动机控制器测试仪 | 泄漏测试仪 | 荧光检漏 | 超声波检漏 | 汽车数字万用表 | 电流钳表 | 电流勾表 | 点火正时灯 |
