Relay Waveform

Capture a waveform that shows both the control circuit change when it turns on the relay, and the power switching on to power something in the ABS system. (Use an oscilloscope with two channels to capture this pattern. You may have to carefully set the trigger to capture this.)

Record the waveform below with the time and volts per division, and explain what you are measuring.

In this experiment when the ABS is switched off, I measured the voltage upon system relay control circuit using oscilloscope and recorded 0.5 volts at 86 whereas 0v at 30. This wiring diagram illustrates that the 86 and 85 is the control circuit whereas 30 and 87 is the switch circuit. According to the diagram 30 is the negative terminal of the switch and 87 is the positive, therefore it is the reverse in this course. Now without the power running when I measure at 86 the switch is not activated which gives the reading of 0V at pin 30. As I turn on the power the voltage at pin number 86 reads 12v as well as pin number 30 therefore it indicates that my the switch is working.

Explain with arrows what is happening in the waveform above.

According to the experiment to switch "on" the relay the circuit must have certain amount of voltage inorder to switch "on" the relay. The switching circuit is 0V when there is no power passing through control circuit. As I switch the ABS on after 200ms, switch closes and voltage pass through circuit switch. There was also voltage drop for 10v at 50ms and then increased to 13v, this happened due to pump self test switching "on" and then "off".