5
Hints & Guidelines
Position the unit on the ground, directly underneath the cable to
be measured. Align the unit in the direction of the cable, with the
cone pointing towards the cable, as shown.
When taking cable measurements, ensure that there are no
walls or buildings within a distance of 7 feet (2m) on either side
of the meter, as reflections from these will distort the readings.
Also ensure there are no trees or other overhanging objects in
the vicinity.
When measuring more than one cable, ensure that none of the
cables are outside the sonic beam, as shown in the Performance
section of this manual. If the cables are not vertically above one
another, this could be the case. In this instance, it will be necessary
to take a number of separate readings
from different positions.
Water and moisture can cause the
Cable Distance Meter to malfunction.
Therefore, the meter should not be
used in rain or snow. If water does
get into the cone, leave it upside
down in a dry, warm area.
If the display shows – – – . – – – , this
indicates a “poor target” and normally
happens when the cables are moving
due to wind, etc. Wait until the wind
dies down to get an accurate reading.
CALIBRATE MODE
The Calibrate mode switch allows the user to periodically check the unit to ensure that
it is still operating within specification. For cable distance measurement, this switch
should be in the CABLE position. When the switch is put to the WALL position, horizontal
measurements to large objects, e.g. walls, can be taken.
When the unit is first used, a horizontal reading to an object, e.g. wall, from a fixed position
should be taken. The reading should be entered, together with the date, into the table below.
Whenever the unit is to be checked for accuracy, a reading should be taken from the same
point, noting the result and date in the table. If the reading is outside of specification, the unit
should be returned to HD Electric for calibration.
Date
Reading
Front
View
Side View
Содержание CDM-50
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