STX-1 Series Instrument www.tensitron.com pg. 13
7. ADVANCED OPERATION
• General Calibration Precautions
1. To verify the accuracy of your instrument, check the tension on a sample
length of strap by suspending known weights from the opposite end.
2. When performing this test, use a micrometer to measure your strap
thickness and ensure it is dimensionally within tolerance.
3. Only use free-hanging weights which are traceable to National Standards
on correctly-sized straps. (See Figure 7.)
4. 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.
• Check Accuracy
1. Confirm that the size strap you’re working with is the same size selected
in your STX’s display.
2. Before engaging the STX instrument onto the strap, zero the instrument
by holding it in the same attitude you’ll be taking the readings and press
the “Enter” or “Zero” button. This will eliminate any small tare effects.
3. Take readings along the strap. FOR BEST RESULTS ALWAYS TAKE
SEVERAL READINGS OF THE STRAP TENSION BY DISENGAGING
AND THEN RE-ENGAGING THE INSTRUMENT FROM THE STRAP
ITSELF.
4. Verify the tension value. For example, if your suspended weight is 40.0 lb.
your instrument should also indicate 40.0 lb. +/- the full-scale accuracy
percentage of the specific instrument model listed in Section 4, once
properly engaged to the strap. This procedure confirms the instrument’s
accuracy and it is now ready for use.
Note: Accuracy Specification: NOTE, ACCURACY IS MODEL
DEPENDENT. For an instrument with a full-scale range of 250 lb., this
translates into +/- 2.5 lbs, and for an instrument with a full-scale range of
500 lb., accuracy is +/- 5.0 Lbs.(With a 1% Accuracy Specification)
If you have additional questions, please contact Tensitron for help.
• Calibrate Instrument
*IMPORTANT: THIS FEATURE SHOULD ONLY BE USED BY A CALIBRATION FACILITY USING CERTIFIED AND
TRACEABLE DEAD WEIGHTS. DO NOT USE THIS FEATURE FOR A SIMPLE ACCURACY CHECK.
If you want to verify or check the accuracy of a Strap go to: “Check
Accuracy” in Section 7: Advanced Operation.
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