Calibrated Size Estimation Chart (Transparency)
Developed from and based on the TAPPI Dirt Estimation Chart, this custom transparency is used to measure the size of spots, defects, or inclusions over the range of 0.02 to 5.00 square millimeters in paper and other industrial materials such as textiles or plastics. Instructions for use of this transparency are outlined in TAPPI Test Method T 564. The chart can be used in a large number of applications where there is a need to estimate a size (area) by way of a direct comparison to a known area disk or rectangle. Applications may include, but are not limited to, the measurement of visible ink spatter on printed surfaces, the estimation of the growth rate of bio-colonies, air inclusions in transparent plastic castings and films, etc.
The charts are manufactured from an original negative produced on photographic contact film. The film positive is produced in a NuArc Imaging System contacting frame with a NuArc light source. The NuArc Imaging System has a built-in integrator which precisely controls the exposure. A hologram with a unique serial number is applied to each chart and a data sheet unique to the serial number with the actual dot measurement sizes is supplied with the chart.
What makes a Calibrated Size Estimation Chart so special?
•These charts are ideal for quality assurance processes that require more exact measurement.
•Each chart has 23 dots that are measured and documented within the specified tolerances.
•The actual measurements for each dot in square millimeters are exported to a Data Sheet with a unique serial number corresponding to the chart.
•The Data Sheet included with the chart provides the maximum and minimum tolerances for each measurement.
•Each Calibrated SEC is individually prepared and bears a tamper evident security hologram with its own serial number to assure authenticity to users.
What it can mean for you:
•You no longer have to calibrate your own charts. You can save time and effort!
•You can feel confident knowing that the each Calibrated Size Estimation Chart is within tolerance; prepared with care and precision to allow you to better serve your customers.
The quality assurance process is outlined below:
All 23 dots (.02, .03, .04, .05, .06, .07, .08, .09, .10, .15, .20, .25, .30, .40, .60, .80, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0.) are measured with a MicroVu Vertex measurement system.
Calibration of the MicroVu Vertex is performed in accordance with the procedures set forth in MicoVu’s Calibration Guide for Measuring Machines (1997) and complies with relevant requirements of ANSI/NSCL Z540-1 and ISO/IEC 17025-standard calibration date-8/20/2018.
Measurement of Dots
•The dots on the chart are correct within an average 10% or 0.005 square millimeters, whichever is the larger.
•The tolerances of plus or minus .005 square millimeters is applied to the 02, .03, .04, .05 dots.
•The tolerance of plus or minus 10% is applied to the .06, .07, .08, .09, .10, .15, .20, .25, .30, .40, .60, .80, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0. dots.
The dots on the chart are correct within an average 10% or 0.005 square millimeters, whichever is the larger. A data sheet that includes the measurements of each dot will be provided to the customer along with the chart. This chart should be used in conjunction with TAPPI T564, NOT T213 or T437.
You may also be interested in TAPPI Size Estimation Charts and Dirt Estimation Charts.
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