R. Kochan

Development of the integrating analog-to-digital converter for distributive data acquisition systems with improved noise immunity

Requirements for the noise immunity of the universal ADC for sensor signal conversion are formulated. The structure of the antijamming dual slope ADC for use in distributive adaptive and intelligent measurement and control systems is described. The normal mode rejection calculated by simulation of ADC operating modes and by experimental research is compared. It has been shown that the sets of operating modes of the developed ADC compared with adaptive properties provide high flexibility of this ADC for determining metrology characteristics of the developed ADC setting.

Temperature Measurement System Based on Thermocouple with Controlled Temperature Field

There is presented error evaluation of temperature measurement system by thermocouple with controlled temperature field. This temperature measurement system provides precision correction of systematic error of temperature measurement in the condition of using thermocouples with significant heterogeneity of electrodes acquired during their exploitation in variable temperature field.

Error compensation in an intelligent sensing instrumentation system

Methods of improving the measurement accuracy by estimation and correction of the maximum error components, are analyzed. The functional structure of the measurement channel in an intelligent sensing instrumentation system is described along with the procedures of component error correction. An experimental setup, implementing such methods in a multi-processing neural network configuration, is presented.

Development of a dynamically reprogrammable NCAP [network capable application processor]

A dynamically reprogrammable network capable application processor (NCAP) that is based on the IEEE 1451 standard is proposed in this paper. The dynamic reprogramming capability of the NCAP allows an on-line changing of its working program via a local area network and supports a set of widely used communication interfaces. The characteristics and requirements of the NCAP and the structure of a simple version of the NCAP, based on an MCS51 microcontroller, are proposed in this paper. The evaluation of the computing power of the proposed NCAP by simulation is described.

Approaches of voltage divider development for metrology verification of ADC

It is presented the method of testing signal generation for ADCs integral nonlinearity identification in testing point using measurement converter based on multi-resistors voltage divider with averaging voltages of all resistors. It is proved that such converter is insensitive to resistances and systematic errors of own resistors. There is evaluated error of ADCs nonlinearity identification, which is caused by changing the curvature of ADCs conversion function in the neighborhood of testing point. Also it is proposed method of number of testing point incrementing - “basic” method, and it is proposed the methodology of development such methods of testing points generation, which provides more evenly distribution of testing points via the range in comparison with “basic” method.

Development of a minimal IEEE 1451.1 model for microcontroller implementation

The IEEE 1451.1 standard was studied and analyzed for resources needed for a minimal implementation of the standard. As a result, a Minimal IEEE 1451.1 Model optimized for the 8051 series of microcontrollers is proposed. In addition, a Minimal IEEE 1451.1 Model implementation in a distributed intelligent sensor network built with remotely reprogrammable Network Capable Application Processors (NCAPs) is presented.

Software-hardware method of serial interface controller implementation

A software-hardware method of serial interface controller implementation is proposed which includes separate processing of data link and physical layer functions The data link layer functions are implemented in software using a microcontroller (MC), and physical level functions -in hardware using programmable logical device (PLD). The proposed method provides optimal ratio of hardware and software costs for interface controller (IC) implementation, and effective utilization of MC computing power. Based on this method a structure of the universal serial interface controller is proposed.

Precision Data Acquisition (DAQ) Module with Remote Reprogramming

In this paper the data acquisition module based on sigma-delta analog to digital converter (ADC) and MCS-51 compatible microcontroller with dynamic remote reprogramming is presented. The main feature of presented module is in integral nonlinearity of ADC correction. The error of proposed correction is considered in this paper.

Approach to improving network capable application processor based on IEEE 1451 standard

The IEEE 1451 standard supports the structure of distributed data acquisition systems and networks. The key components for such a distributed network are the Network Capable Application Processor (NCAP), Smart Transducer Interface Module (STIM), and the communication interface between them. This paper proposes an approach to improve the NCAP by introducing the functions of on-line dynamic reprogramming of the NCAP and software-programmable interface to support the most widely used communication interfaces between the NCAP and STIM via the network. Experimental research results of the proposed approach applying software-programmable interfaces, application examples of the proposed NCAP, and benefits of the applications are presented in the paper.

The control system of the profile of temperature field

There is proposed method of control which could be implemented for heaters situated across electrodes of the main thermocouple and provides stabilization profile of temperature field. The proposed method has small requirements to memory space and computing power so it could be implemented using 8-bit microcontrollers.