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Ultrasonics Digital Cable Height Meter Suparule 600:

 

 
The Suparule Cable Height Meter is a handheld meter for measurement of cable sag, cable height distance, and overhead clearance of conductors. It is a modern alternative to telescopic measuring poles. The Suparule Cable Height Meter utilises ultrasonic signals to determine the height of overhead cables up to 23m (75feet). Used by line operators within the utilities industries, e.g., electricity and telecommunications, the CHM190 measures the height of a single wire, the CHM300 and CHM300E measure up to 3 wires, while the CHM600 and CHM600E models measure up to 6 wires.
 
How it works
 
The Cable Height Meter emits 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 instrument. The result can be displayed in either feet and inches (imperial), or meters (metric) format. To account for the fact that speed of sound varies with temperature, a temperature sensor, mounted at the front of the instruments, senses the actual air temperature, and automatically compensates.
 
Operation
 
The Cable Height Meter is capable of measuring up to six cables (provided they are within range). This is accomplished by standing directly beneath the cable and aligning longitudinally (looking down the line). Simply press the ON button to power up the instrument, and allow the temperature to stabilize. Press the MEASURE button and, if necessary, gently rock and tilt the instrument until a stable reading is obtained.
 
Applications
 
Applications include height measurement of:
 
Telephone lines
Distribution lines
Transmission lines
Cable television
Street lighting
SAG (lowest point to ground)
Clearances on construction sites
 
The unit also provides a safer way to measure cable heights on highly congested roadways. Additionally the Cable Height Meters offer an easy way to check whether the device has remained in calibration since its purchase date. Switching to CAL mode also allows the instruments to be used indoors.
 
Features and benefits
 
Quick Measurement - saves time and money
Inherently safe - No physical connection to cables or wires required to obtain measurement
Extremely Accurate - measures to accuracy of 0.5%
Easy to use with LCD Display - Simple, three-button operation ensures fast, effective measurements with a minimum of operator training, one man operation
Compact size - Its light weight and hand held portability allows easy transport and multiple measurements
Maintenance free - proven reliability in the field, no adjustments required
Warranty - 2 year
Comes with leather case
Auto power off after 3 minutes
Measures up to 23m (75ft), Long life battery capable of 50,000 measurements

Additional Features of CHM300DT and DT80:
Horizontal as well as vertical measurement, Measures horizontally to over 40m. Further facilitates sag measurement and location of mid span.  
 
 
 
 
 
link: http://www.suparule.com/products/cable-height-meter/