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The CHM Series of Cable
Height Meters utilize ultrasonic sound to determine the height of up
to six overhead cables and wires. The instruments are designed to
address specific measuring requirements on cables up to 75 feet (23
m). The CHM600 (C/N 659600) and CHM600E (C/N 659600E) are designed
primarily for power cable applications, while the CHM2000 is designed
for telecommunication applications.
The Cable Height Meters emit short bursts of sound which originate
from the cone shaped transmitter. The microprocessor in the
instruments calculates the elapsed time for the bursts of sound to be
reflected from the cable back to the instruments. The result can be
displayed in either feet and inches or meters. However, before the
final measurement can be displayed, the air temperature must be
measured because the speed of sound varies at approximately 0.2
percent per degree Celsius.
A temperature sensor, mounted at the front of the instruments, senses
the actual air temperature. This information is sent to the
microprocessor and incorporated into the algorithm. The distance is
then displayed in meters or feet and inches depending on which was
selected. |
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