The positive and negative coordinates only indicate the direction.

The size of the coordinate is the distance from the origin

Remember to add units to the coordinates

Points in x-t image

line in x-t image

Multi-object x-t image

Electromagnetic dotting timer

Electric spark dotting timer

50Hz Þ Make a point every 0.02s

Install the dotting timer, paper tape, and power supply

The car approaches the dot timer

Turn on the power first, then pull the trolley to print out the paper tape

Select clear dots and mark letters

Design data record table

Calculate time, measure displacement with scale

Unable to print dots: When installing the paper tape, put the paper tape on top of the copy paper. The paper tape is installed under the carbon paper

The vibrating needle does not move: it is connected to the DC power supply by mistake. Dot timer connected to AC power

Before release, the car approaches the dot timer

Turn on the power first, then pull the paper tape

Don't waste paper tape

After finishing dotting, turn off the power immediately