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Block Diagram of Measurement System.

Block Diagram of Measurement System.

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Figure 1. Block Diagram of Measurement System.
Figure 4. Histograms of Distributions for Frequency Reference Error.
Figure 5. Histograms of Distributions for Time Reference Error.
Measurement accurasy dimensions.
REFERENCE'S ACCURACY IN VIRTUAL FREQUENCY-TO-CODE CONVERTERS
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The methodology and experimental results of the researches for thermal instability of reference clock generator in microcontroller based frequency-to-code converters with virtual channel are described in the Paper. The temperature uncertainty of the frequency and time references, distribution laws and correlation factor of their errors were determi...
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... The distribution of measured data is shown as histogram on Fig. 4. Bottom of the histogram are placed indicators for arithmetic mean value of frequency, its standard deviation and relative error. The last one is calculated using equation [14]: ...
Design, Development and Calibration of Virtual System for Relative Humidity Measurement
Article
Full-text available
  • Jun 2008
Abstract: In the present paper a frequency mode data acquisition technique, which converts directly relative humidity into a frequency signal, is considered. The system is realized using low cost oscillator, multifunction data acquisition board and capability of virtual instrumentation. In order to automate calibration procedures appropriate software (so called virtual instrument) is developed and described in brief. Using possibility of virtual instrumentation or to be more precise the build in LabVIEW probability, statistics and interpolation functions a method to increase calibration accuracy is suggested and put into practice. Following this approach the polynomial calibration equation for capacitive sensor is extracted and saved in transducer electronic data sheets file. As example of proposed approach a virtual system based on relative humidity capacitive sensor is realized. The main objective of this paper is to demonstrate how with virtual instrumentation can be solved some difficult engineering problems such as relative humidity calibration and measurement. Copyright © 2008 IFSA. Keywords: Capacitive sensors, Frequency measurement, Graphical programming, RH calibration, Virtual instrumentation
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Front Matter and Index
Chapter
  • Apr 2002
Half-title pageTitle pageCopyright pageTable of contentsPrefaceList of abbreviations and symbolsIntroductionSubject index
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