National Institute of Standards (NIS), Egypt. The system consists mainly of a fabricated thermal current converter (TCC) associated with a definite hardware and a flexible software. The new system has been harmonized to cover a wideband range from 5 mA to 20 A at frequencies from 10 Hz to 100 kHz. In addition, the system has been used in measuring specific characteristics of the TCC, such as the time response, dc reversal errors, and the transfer errors at different frequencies. The design of the fabricated TCC was re-modified then re-calibrated in PTB, Germany to promote the system reliability.
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Sources of Uncertainty in Standard Resistors
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 […]
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Calibrating Long Scale DMMs with Fluke MET/CAL and the Fluke 57xxA Through 90-day Characterization
by Michael Johnston Due to the high accuracy of the long scale (8½-digit) meters, the standards and methods required to perform a verification of the device often make automation of the process difficult. Alternatively, guardbanding […]
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The Metrology of PCB Signal Integrity
by Chris Grachanen High speed data computations and routing rely on incredibly complex circuit board designs with data transfer rates fast approaching picosecond timing precision (that is one trillionth or one millionth of one millionth […]