Articles – Page 15 – Cal Lab Magazine

Source Based Discrepancies in UV Meter Calibrations

October 27, 2020 Office

by David Mendoza Volume 16:4, Oct-Dec 2009 The errors associated with the calibration of broad band UV meters based on the light source used during calibration are well documented but appear to not be very […]

Assessment of Compliance with Specifications

October 27, 2020 Office

by John Hurll Volume 16:4, Oct-Dec 2009 It is often the case that it will be necessary to provide information in calibration reports about whether or not the stated results for general purpose test and […]

A Day at the BIPM

October 27, 2020 Office

by Richard Fertell Volume 16:3, Jul-Sep 2009 The Meter Convention (Convention du Mètre) is a treaty signed in 1875 that created the International Bureau of Weights and Measures (BIPM), an international organization under the authority […]

The Acropolis Width and Ancient Geodesy

October 27, 2020 Office

by Nicholas Kollerstrom Volume 12:4, Oct-Dec 2005 “Was the Earth measured in remote antiquity?” This was the stirring question with which Berriman opened his book, Ancient Metrology. [1] To be sure, the question had earlier […]

Single Instrument Calibration of Signal Generators to 50 GHz

October 27, 2020 Office

by Rich Pieciak and Kay-Uwe Sander Volume 12:3, Jul-Sep 2005 As a fundamental tool of virtually every microwave and many digital design engineers, the accuracy of a signal generator is critical, whether in the laboratory, […]

Measuring Receiver Creates Benchmark for RF Power and Modulation Measurements

October 27, 2020 Office

by William M. Kilpatrick Volume 11:3, Jul-Sep 2004 When Hewlett-Packard introduced the HP 8902A measuring receiver in 1981, IBM had just announced the personal computer, the World Wide Web was just a glimmer in the […]

Meeting ISO 17025 for Complex Electronic Equipment

October 27, 2020 Office

by Dave Abell and Jon Moens Volume 9:4, Oct-Dec 2002 Calculating measurement uncertainties for a single parameter such as DC voltage is relatively straightforward, but to do so for a complex microwave spectrum analyzer that […]

Sources of Uncertainty in Standard Resistors

October 27, 2020 Office

by Jeff Gust Volume 7:5, Sep-Oct 2000 As metrologists are acutely aware, when one transfers a measured value such as resistance, they also transfer a measurement uncertainty that is associated with the calibration of the […]