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Home  »  Mark-10 in the Press

Mark-10 in the press


Quality 101: The Advanced Force Tester

Quality, February, 2022

Navigating Supply Chain Challenges with Force Testing

Quality, May, 2021

Essential Testing for Essential Industries

Quality, September, 2020

The Devil is in the Details: Choosing a Proper Grip for Tensile Testing

Quality, January, 2020

Compression Testing Basics

Quality, July, 2019

A Primer on Materials Testing

Quality, January, 2019

Nondestructive Compression Force Testing: What, Why, and How

Quality, June, 2018

5 Common Errors in Tensile Testing

Quality, November 2017

The Universality of a Universal Testing Machine

Quality, April 2017

The Importance of Grip Selection in Force Measurement

Quality, February, 2017

Compression Force Testing: Why and How

Quality, November 2016

Harnessing The Power of Digital Force Gauges

Quality, September 2014

Rethinking Force Measurement

Quality, July 2013


  •   Rethinking Force Measurement, Quality, July 2013
  •   Get Results with Force Measurement, Quality, March 2010
  •   Torque Measurement Basics, Quality, October 2009
  •   Testing Force & Torque In Packaging Pharmaceutical & Medical Packaging News, September 2008
  •   Force Gauge Basics, Quality, January 2008
  •   Is It Good?, Quality, June 2007
  •   May The Force Be With You, Quality, August 2006
  •   Ensuring Simplicity and Easy Operation, Quality, June 2005
  •   The Quest For Quality with Force Measurement, Quality, June 2003
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Accuracy

Mark-10 defines accuracy as a percentage of full scale of the instrument. To determine the measurement error as an actual load value, multiply the accuracy percentage by the instrument’s capacity.

Example 1 – M5-50 force gauge:

The accuracy is ±0.1% of full scale (FS). Multiply ±0.1% by 50 lbF, which equals ±0.05 lbF. This means that any displayed reading may be higher or lower by up to 0.05 lbF. For example, if the displayed value is 30.00 lbF, the true reading will be ≥29.95 lbF and ≤30.05 lbF.

Example 2 – Plug & Test® indicators and sensors:

The accuracies of the sensor and the indicator must be added together. Models 7i and 5i indicators have accuracy values of ±0.1% FS, while the Model 3i is rated at ±0.2% FS. Using the example of a Series R50 torque sensor with Model 3i indicator, add ±0.35% to ±0.2%, which equals ±0.55%. In a specific example for the Model MR50-12, the accuracy becomes ±0.55% x 135 Ncm = ±0.7425 Ncm.

Percentage of Reading:

Because of these fixed errors, lower measured values will be more inaccurate as a percentage of reading.

Further using the example of an M5-50 force gauge, a fixed error of ±0.05 lbF represents a higher error as a percentage of reading for a load of 1.00 lbF than 30.00 lbF.

To calculate the error as a percentage of reading, divide the fixed error by the measured value. For a 1.00 lbF load, the fixed error equals ±0.05 ÷ 1.00 lbF = ±5% of reading. For a 30.00 lbF load, the fixed error equals ±0.05 ÷ 30.00 lbF = ±0.17% of reading.

Conclusion:

Because of the relationship between load and accuracy, we recommend selecting an instrument capacity as close as possible to the maximum measured load.

Sampling Rate

Sampling rate is defined as the rate at which the instrument’s electronics communicate with its load sensor. A faster sampling rate more accurately captures the peak load which occurred during the test. This is especially apparent in applications where the load builds up and falls very quickly – such as the break testing of glass or ceramics. The graphs below illustrate the advantage of a fast sampling rate:

The graph at left shows that an instrument with slower sampling rate may not accurately detect the true peak. In the graph at right, the faster rate accurately captures the true peak.

Sampling Rate vs. Output Rate

While Mark-10 instruments internally sample at up to 14,000 Hz, a typical streaming output rate to MESURgauge software is approximately 25 - 50 Hz. If a faster data collection rate is required, our Series 7 force gauges and indicators can collect data at up to 14,000 Hz, store the data internally, and bulk-download the data to a PC when the test is complete.

Capacity x Resolution

Capacity:

This value represents the maximum measurable load. All available capacities are listed for each available unit of measurement. All instruments measure from 0 to the indicated capacity.

Resolution:

This value represents the smallest measurable increment. For Plug & Test® sensors, the resolution depends on which indicator is used. Refer to the Capacity x Resolution tables on the particular sensor’s webpage or data sheet.

Example - M5-50 Force Gauge:

Pound-force Capacity x Resolution for the M5-50 force gauge is 50 x 0.01 lbF. This means that the gauge measures from 0 to 50 lbF, with increment size of 0.01 lbF, i.e., 0, 0.01, 0.02, 0.03…50.00.

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Hard vs. Soft Joints

Rundown fixtures contain an internal spring which dampens the rate of increase in torque when a power tool is used, thereby contributing to a more accurate torque measurement. Two fixtures are offered, with different internal spring rates, to address a wide range of applications. Select the AC1066-1 to simulate a soft joint with gradual torque buildup, or AC1066-2 to simulate a hard joint with faster torque buildup. Either fixture is suitable for the full range of torque up to 100 lbFin (11.5 Nm).

Examples of hard and soft joints are provided below: