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106
3.3.11 Variable speed cooling fan
At present, most cars' fans are variable-speed, and the speed of the fan can be adjusted according to different
working conditions and temperatures.
Use a BNC to banana cable, connect one end to channel 1 of the oscilloscope, ground the other end of the black
plug, and use a needle to pierce the red connector into the signal wire of the fan terminal; use a current clamp,
connect one end to channel 2 of the oscilloscope, and clamp the other end to it Pay attention to the direction of the
current on the fan's power cord. (If you need to test the current, connect a current clamp).
Use ATO oscilloscope to test the cooling fan, the specific operation is shown in Figure 3-37:
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