Figure 20-4. Stop and Go Recordings

TM 9-2320-211-20-3-2

(2) Stop and go field. The stop and go field (Fig. 20-4) is between the

inside time scale and the distance recording field. The stop and go stylus records

when the truck is moving or standing still. The recording mechanism is made up of

an oscillating pendulum balanced by a spring. When the truck is moving, the pendu-

lum vibrates, which makes the stop and go stylus move up and down. This up and

down movement of the stylus makes a solid looking red bar about 1/16-inch wide.

When the truck is stopped, the stylus will not move up and down, so a thin red line

will be recorded. The vibrating pendulum records all vibrations of the truck without

any connections to the drive train. This recording will work even if the drive cables

are broken or taken off the tachograph.

Figure 20-4. Stop and Go Recordings