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Calibration of wideband digital real-time oscilloscopes.

Humphreys, D A; Hudlicka, M*; Fatadin, I (2015) Calibration of wideband digital real-time oscilloscopes. IEEE Trans. Instrum. Meas., 64 (6). pp. 1716-1725.

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We describe a frequency selection algorithm for calibrating the impulse-response (vector frequency response) and timebase characteristics of Digital Real-Time Oscilloscopes (DRTO). The objective of the algorithm is allow the DRTO to be calibrated as closely as possible to a chosen frequency grid while optimizing oversampling, timebase fidelity and minimizing the uncertainty contribution due to instrument impairments. Measurement examples are given for cases where the measurement frequency can be selected by the user and where this frequency is predetermined. The use of Allan variance in the frequency-selection process is described and an algorithm and example for inter-channel delay measurement is presented. We also discuss the merits of representing the calibration results either as a convolutional correction or as an impulse response.

Item Type: Article
Keywords: Oscilloscope, Real-time, Sampling, Multi-sine, RF Communication
Subjects: Electromagnetics
Electromagnetics > Wireless Communications
Identification number/DOI: 10.1109/TIM.2015.2407471
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6675

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