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2
2
5：The probe clip and probe are connected to two of the signal lines of the
communication line,Regardless of positive or negative,If there are multiple
signal wires,You need to judge the signal li ne in advance by yourself,Or try to
choose 2 of them to test
6：Ensure that there is a communication signal on the communication line at this
time
7：Adjust the vertical sensitivity to 50mV gear
8：Time base adjusted to 20uS
9：When there is a communication signal on the communication line,The
oscilloscope will capture and display it on the screen,If you can’t capture it, you
need to try to adjust the time base and trigger voltage (yellow arrow).
Infrared remote control receiver measurement
Gear sel ection:The infrared remote control signal is generally 3~5V,The highest
test of 1X file is 40V,Therefore, 1X gear is sufficient for testing car
communication signals.(The probe and the o scilloscope are both set to 1X
gear).
1：First set the oscilloscope to Normal trigger mode,Normal trigger mode is
specially used to measure non-periodic digital signals,If you use Auto trigger
mode, you cannot catch aperiodic signals.Infrared remote control signals are
non-periodic digital coded signals
2：Set the oscilloscope to 1X gear
3：The oscilloscope is set to DC coupling mode
4：Plug in the p robe,And turn the switch on the probe handle to the 1X position
5：Connect the probe clip to the ground (negative) of the infrared receiver main
board,The probe is connected to the d ata pin of the infrared receiver
6：Adjust the vertical sensitivity to 1V gear
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