Table of Contents
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Most three-point tension meters employ only linear characterization and
5.5 Non-linearity
have large errors at the midpoints (up to 15%). The CTM uses multi-point
segmenting to correct for non-linearity, reducing it to less than 0.2%.
5.6 Wire Characteristics
Creep
Variations
Strands
6.0 Troubleshooting
Problem
Powers on momen-
tarily and turns off
Does not power on
Display is
completely dark
Display drifts down-
ward once installed
Temperature not
accurate
Every material including steel exhibits creep under load. It will
neck down over time, quite quickly over the fi rst few seconds
and much slower as time progresses. A wire cable also sees
creep from the wire spacing and wind. This effect is seen as a
display that drifts lower after it has been clamped in line.
Material that varies in diameter or shape will have different
output at the same tension
The best cable assembly is one that is perfectly round, as
it will not change contact geometry with the wire twist. The
closer the wire cable cross section appears to be round, the
better the measurement performance will be.
Possible Cause
Solution
Low battery
Replace with high quality alka-
line batteries
Low battery
Replace with high quality alka-
line batteries
Batteries installed
Insure that positive terminals
backwards or no
of both batteries (nub) face in-
spring contact
ward - towards the black cap.
Check that spring is attached
to the battery cap.
Software reset
Remove battery cap & reinstall
after one minute. Attempt to
turn power on again.
Display contrast too
Hold the Right Arrow key down
light
while pressing the F2 key
several times to increase the
display contrast. If nothing oc-
curs, release both keys. Press
the power button and try again.
Display contrast too
Hold the Arrow key down while
dark
pressing the F1 key several
times to decrease the display
contrast.
Wire material is
This is normal behavior of
creeping and inter-
wire. Lower display resolution
nal friction between
to mask this effect.
wires is relieved.
Instrument changed
Allow instrument to remain in
temperature envi-
environment until temp stabi-
ronments
lizes or enter temp manually
Instrument exposed
Enter temp manually
to sun
16
Table of Contents
1.0 Introduction ......................................................................................................................... 3
1.1 Unpacking ................................................................................................................... 3
1.2 Description .................................................................................................................. 3
1.3 Important features ....................................................................................................... 4
5
2.1 Typical Operation ........................................................................................................ 5
2.2 Measurement Practices .............................................................................................. 6
2.3 Softkey Functions ....................................................................................................... 7
3.0 Confi guration Mode ............................................................................................................ 11
3.1 Accessing the Confi guration Mode ........................................................................... 11
4.0 Changing Sheaves ............................................................................................................. 14
5.0 Achieving Best Accuracy .................................................................................................... 15
5.1 Accuracy ................................................................................................................... 15
5.2 Calibration to Specifi c Wire Type ............................................................................... 15
5.3 Loading Error ............................................................................................................ 15
5.4 Non-repeatability ....................................................................................................... 15
5.5 Non-linearity .............................................................................................................. 16
5.6 Wire Characteristics .................................................................................................. 16
6.0 Troubleshooting .................................................................................................................. 16
1
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Related Manuals for Check-line CTM
Summary of Contents for Check-line CTM
-
Page 1: Table Of Contents
Most three-point tension meters employ only linear characterization and Table of Contents 5.5 Non-linearity have large errors at the midpoints (up to 15%). The CTM uses multi-point segmenting to correct for non-linearity, reducing it to less than 0.2%. 1.0 Introduction ......................... 3 1.1 Unpacking ........................ - Page 2 Fair the same being measured 8,000 lbf/ 3,500 kgf/ 35,000 N CTM instrument: Do not use the CTM to measure tension for wires if both of the following are Displayed resolution setting true: High 1. No wire calibrations are stored of the same diameter as the wire you are...
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Page 3: Introduction
4.0 Changing Sheaves 1.0 Introduction As you use the CTM on different diameter cables you must change to the Do not use the CTM with cable This manual covers the setup and operation of the CTM Clamp Line Ten- correct sheave size. To change sheaves, remove the hex head screws larger than indicated on the siometer. -
Page 4: Important Features
1.21 Front Panel and Keys The front panel of the CTM is shown in Figure 2. • Enable C - Enable or disable Centigrade temperature. • Enable F - Enable or disable Fahrenheit temperature. Press this softkey to enable or disable the auto-shutdown. If you enable this function you are prompted to set a period of time in minutes. -
Page 5: Operation
Press the WIRE key to list the Comm Communication output not supported at this time in the CTM unit of measure is lbf. Place the CTM so the two outside sheaves hang stored calibrations. on the wire. Insure that the wire rope is riding in the groove of all three Mode Press this softkey to set the display mode on power up. -
Page 6: Measurement Practices
The built-in average function is ideal for this task. 1. From normal operating mode, press the Right Arrow softkey Do not use the CTM to measure tension for wires if both of the following are true: A new softkey set, shown below, appears: 1. - Page 7 Fahrenheit or Centigrade and if the temp is one that was Entrd (entered) manually. You can enter the temperature in one of two ways; let the CTM de- termine the ambient temperature automatically or key in a tempera- ture manually.
- Page 8 Press this softkey to choose the source of the temperature reading, easy graphical view of the applied tension versus the desired ten- the CTM itself (Meter), outside input (Input) or None. If you choose Upper and lower thresholds are sion. This mode works well when you are repeatedly tensioning to Input, you are prompted to enter the temperature.
- Page 9 CHECK LINE ® • BY ELECTROMATIC CTM Tension Meter Operating Manual...
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