Check-line CTM Operating Manual page 2

Specifi cations
2 AA, common alkaline batteries. Operational battery life over 40 hours at
Power
room temperature. Battery life is reduced at lower temperatures.
Display
Dot graphic LCD display
Operational keys Power, Wire, Escape/Clear (Esc), Next (
ing fuction and label, depending on the specifi c menu in use
Operational annunciators Unit of measure, battery level
Temperature detection Temperature accuracy approximately ±2° F (±1°C)
Display resolution
2,000 lbf/ 1,000 kgf/ 10,000 N CTM instrument:
lbf (pound-force)
kgf (kilogram-force)
N (Newton)
Custom units
8,000 lbf/ 3,500 kgf/ 35,000 N CTM instrument:
lbf (pound-force)
kgf (kilogram-force)
N (Newton)
Custom units
For ease of use, the display always counts by a multiple of 1, 2 or 5.
Varied wire sizes
Available options
Suitable for outdoor use
Operating environment
Dimensions 10˝ x 23˝ x 3˝ (25 cm x 59 cm x 8 cm) approximately
Weight
11 lb (5 kg) approximately
) and four softkeys with chang-
Displayed resolution setting
Low Med High
10 lbf 5 lbf 2 lbf
5 kgf 2 kgf 1 kgf
50 N 20 N 10 N
between 101 & between 201 & between 501 &
200 divisions 500 divisions 1000 divisions
Displayed resolution setting
Low Med High
50 lbf 20 lbf 10 lbf
20 kgf 10 kgf 5 kgf
200 N 100 N 50 N
between 101 & between 201 & between 501 &
200 divisions 500 divisions 1000 divisions
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5.0 Achieving Best Accuracy
The CTM is an instrument designed to give accuracy that typically exceeds
5.1 Accuracy
normal requirements for wire tensioning. You should have an understanding
of what factors affect tension measurement accuracy.
While it is best to have the instrument calibrated to the specifi c wire size(s)
5.2 Calibration to
and type(s) used, the CTM can often work adequately in other situations. If
Specifi c Wire Type
the best tension accuracy is required, it is recommended that a calibration
be performed for that specifi c wire size and type.
What calibration choice and sheaves should I use?
Situation
Exact wire size
and type is
Contact your distributor for any
shown in wire list
additional calibrations you may
need. Wire size is
same, but type is
not identical
Wire size is not
the same
Do not use the CTM to measure tension for wires if both of the following are
true:
1. No wire calibrations are stored of the same diameter as the wire you are
looking to measure, and
2. You do not have sheaves of the same diameter.
If both of these conditions exist, contact your distributor.
Contact your distributor to improve accuracy for a specifi c wire type by
calibrating to it.
A tensiometer works by defl ecting the cable, which makes the cable path
5.3 Loading Error
longer than when a tensiometer is not installed. When the tensiometer is
removed, the wire tension decreases as the cable length is restored. This
effect is known as loading error. The CTM design elongates the cable by a
mere 0.08 inch (2 mm), making loading errors extremely small.
The CTM's sheave with bearing design provides the best mechanical
5.4 Non-repeatability
performance. It is also superior at detecting tension that is being added or
removed.
Wire calibration Sheave
Accuracy
selection selection
Description of Sheaves noted
Best
exact match in list
Description of
Sheaves noted
same wire Good
for that wire size
diameter
Sheaves match-
Closest diameter ing the wire size Fair
being measured
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