3.2.6 How to use the TTL logic probe
3.2.6.1 Connect input “IN” to the examined point
3.2.6.2 If the green light at “LO” turn-on, the examined
point will be logic level “0”
3.2.6.3 If the red light at “HI” turn-on, the logic level
equal”1"
3.2.6.4 If the yellow light at “PULSE” blink, in the same
time light at LO and HI blink together. It shows the changing
of unstable logic level or it occurs pulse at this point.