TM 5-3610-253-14
(3) Pulse former for measurement system (TAM). This circuit receives forward
and backward pulses from the scanning device on the linear scale. These pulses are
applied to a six-stage up-down counter (of which only five are used by this machine)
counting up for backward movement, and down for forward movement. A reference
signal from linear scale is sent to the TAM circuit whenever the scanning device
passes over a preset reference point on the linear scale. This is used to ensure
that the adjustment dials information has been inserted into the counter and an
accurate measurement of the distance is displayed. Five miniature rotary type
switches are located on the front of the board. These are used for adjusting the
display. The switches have ten positions, 0 - 9. Three LED lights are also located
on the board. These indicate the following:
Lit during each backgage movement
V1
V2
Lit only during forward movement
Lit only during the passing of the reference point.
V3
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