Articles – Page 28 – Cal Lab Magazine

Metrology 101: The Effect of Cables and Shields on Traceability

May 20, 2014 Office

by Jesse Morse If a person making a dc or low frequency measurement fails to select the proper cables, or to properly connect the shields the traceability chain for that measurement can be violated. This […]

Tolerances for Non-Linear Analog Resistance Scales

February 18, 2014 Office

By Tom Morgan A method is derived for calculating the resistance tolerances for non-linear resistance scales, whose accuracy tolerances are given in degrees of arc instead of percent of reading or range. Read the Full […]

Progress in the Theory of the Laminar Tube Thermal Flow Sensor

February 18, 2014 Office

By Thomas O. Maginnis, Ph.D. Thermal mass flow sensing is well established commercially for measurement and control of low gas flows in the semiconductor industry and elsewhere. Yet the basic theory of this critical flow […]

Leveraging LEAN in the Laboratory

February 18, 2014 Office

By Dean S. Williams What do you do when faced with a doubling of demand with virtually no increase in resources? Go LEAN. That was the approach Duke Energy’s Standards Lab took when it faced […]

Performance Measurement and Design Optimization of a Cooling Fin Array

December 10, 2013 Office

By Roger Bond, Kelly Bray, Marcellino Valdez, and Matthew Rickard Abstract: As part of an undergraduate mechanical engineering course at California Baptist University, we have performed a design optimization study of a fin array for […]

Pipette Calibration: The Gravimetric Method and Balance Resolution

December 10, 2013 Office

By Ann Lenhardt & Erin Lenhardt The most common and economical method used for pipette calibration is gravimetric analysis, defined as the quantitative determination of an analyte based on the mass of a solid. Many […]

Design Considerations of a Two-Pressure Humidity Generator

December 10, 2013 Office

By Bob Hardy The two-pressure humidity generation technique is a well-known, highly documented method used for precise control of humidity values. This straight-forward method is in practice world-wide in a large number of standards and […]

METROLOGY 101 Article Correction

September 12, 2013 Office

The Metrology 101 article from the Jul-Sep 2013 issue, “Testing Linearity on the Agilent E441xA Power Sensors,” has been updated online. The upper and lower readings are incorrect in the printed version. An Excel spreadsheet […]