ACM Series Instrument www.tensitron.com pg. 10
Maintaining Your Meter
Return your meter to Tensitron for service when:
Pointer does not reset at 0 with memory lock "off."
Instrument has been dropped or otherwise damaged.
When using on aircraft, the instrument should be calibrated at intervals
not to exceed 12 months.
6. ADVANCED OPERATION
Checking Accuracy
1. To verify the accuracy of your instrument, hang a 5’ length of your cable
vertically. Suspend a known weight from the end. (Make sure the weight does
not exceed the maximum tension range of your instrument.) Engage the
instrument on the cable. See if the tension value matches the suspended
weight. (See Figure 8)
2. NOTE: Tension on a cable can be defined as the exact value of a suspended
weight from the cable. For example, a 100 lb. weight hanging freely from a
cable will tension the cable to exactly 100 lbs.
3. When performing this test, use a micrometer to measure your cable diameter
and ensure it is dimensionally within tolerance, +/- .003” of size, and not out of
round.
4. Only use free-hanging weights which are traceable to National Standards on
correctly-sized cables.
5. Never use any tensioning device that attempts to convert rotational torque
values into tension loads, as these types of systems are highly inaccurate.
Also, any load cell system must be routinely checked for accuracy using
traceable weights as these types of systems are also highly inaccurate and
generally do not meet the minimum repeatable accuracy standards required
by ISO-17025.
6. NEVER SIMULATE TENSION LOADS ON THESE INSTRUMENTS BY
USING A CALIBRATION BAR!
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