Salvatore Nuccio, Ciro Spataro, Giovanni Tinè
In this paper we examine the behaviour of a portable PC-based measurement instrument, in the presence of electromagnetic disturbances, investigating how its characteristics change with respect to the ones measured in absence of electromagnetic phenomena. The analysis is carried out by means of experimental tests, subjecting the equipment under test to the threats considered by the IEC-61326 standard. The results show that the electromagnetic influence can lead to a worsening of the tested instrument features.
E. Nunzi, P. Carbone, D. Petri
The conformance test to which electronic devices are subjected after the manufacturing process, indicates if the device complies with an a priori given requirement set. On the basis of the test result, the component is considered to be working or not–working. However, because of the measurement uncertainty introduced by the testing bench assessment and by the chosen estimation algorithm, the manufacturer could include in the production process a component which does not respect the given requirements or could reject a working device, thus affecting both testing and productivity costs. In this...
D. Macii, S. S. Demirsoy, P. Carbone, I. Kale
This paper presents a general-purpose strategy to test and to compare the performances of PC-based, mixed-signal development systems for DSP applications, thus helping designers and project managers to select the best tool in terms of cost-to-performance ratio. The proposed approach, based on a simple data acquisition and signal generation design, has been implemented and validated experimentally.
Bruno Andò, Salvatore Baglio, Vito Caruso, Nicola Pitrone
The characterization of the micro-controllers involves the characterization of its peripheral devices, mainly the ADCs, the PWMs, the timer signals, sometimes the DACs. A testing platform has been realized, with reference to the ST430 micro-controller. It consists of a board and some programmable instruments connected to a PC, on which the implemented software can run. The user can make the choice of the test to be performed, can carry out the chosen test and can analyze and store the results. The static ADC characterization has been taken into account in this work and some results obtained...
Roland Holcer, Linus Michaeli, Ján Šaliga
Testing of ADC’s differential nonlinearity (DNL) by the histogram method requires signal generator with extremely low distortion and high stability. Author developed new histogram-based testing method with exponential stimulus signal. In this paper, the modification of this method is presented. The single exponential test signal is replaced by periodical exponential signal. The histogram from the recorded samples and that for the best fitted shape allows determining the differential nonlinearity of ADC. This modification gives some advantages presented and discussed in the paper. The...
M. Catelani, E. Campani, M. Del Pistoia, R. Singuaroli, M. Mugnaini, A. Fort
This paper describes a general purpose high reliable DAQ for widely used sensor families. The development of a system which allows performing fast multi-channel data acquisition and ACD testing by means of single and two tone tests grants high reliability.
Anna Domańska
The present paper examines a deterministic approach to quantization in a-d conversion processes. Temporal and spectral representations of the quantization error are discussed, referring to conditions where the characteristics of the quantizer are ideal and a sinusoidal signal is converted. A formula is provided for estimating the bandwidth occupied by the quantization error. The spectrum model of the quantization error is discussed as a tool of the description and testing of A/D converters.
Sachiko Goto, Yoshiharu Azuma, Tetsuhiro Sumimoto, Yoshihiro Takeda, Shigeru Eiho
Our aim was to improve the accuracy of classifying x-ray mammographic breast densities. The histogram approach using the neural network was used for the purpose of constructing a flexible system. In this study the phantom of the synthetic breast-equivalent resin material for the process of the A/D conversion of mammograms was employed. The digital values can offset the difference in characteristics between the mammography system, the unit, etc. Furthermore the features of our system use the neural network, and then tune the neural network by the histogram of the digital values and by the...
Ivo Viščor, Josef Halámek
In the paper, the importance of the purity of ADC clock is discussed. The clock signal may be contaminated with the spur sidebands or the phase noise. These imperfections are transferred to the acquired data.
Michal Široký, Jan Čermák, Jaroslav Roztočil
In this paper we will discuss methods that can be readily used for frequency (phase) stability measurements of testing signals. To illustrate the case we will describe the measurements on two function generators for ADC testing, a HP33120A and Agilent 33250A, carried out at the Standard Time and Frequency Laboratory of the Institute of Radio Engineering and Electronics (IREE), Prague.