TM 5-6675-325-14
5-3.1 Measuring Instruments.
Provide an approximate measurement of a line
or area by translating the movement of measuring instruments during tracing into
electronic pulses.
Measurement pulses (counts) are emitted as long as the measuring
instrument is moving.
The pulses (counts) are sent to the auto-scaler. There are
four measuring instruments:
planimeter, linear measuring probe, point counter pen
and drafting bridge.
Planimeter.
Used to trace the perimeter or boundary line of a plane figure.
Pulses emitted during tracing are sent to the auto-scaler and counted. The count is
then used in calculating the estimated area or volume measurement of the figure.
b. Linear measuring probe. Used to measure the length (distance) of curved or
straight lines.
The linear measuring probe emits pulses per unit of length
measured.
The pulses are sent to the auto-scaler and counted. The count is then
used in calculating the estimated length or distance of line measured.
a.
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