The radiated immunity test of an astable multivibrator at over-normative field strengths - Open Research Data - MOST Wiedzy


The radiated immunity test of an astable multivibrator at over-normative field strengths


The dataset presents a result of measurements that are a part of electromagnetic field immunity tests. The radiated, radio frequency, immunity tests were carried out for a typical astable electronic multivibrator. Tests of immunity of electronic systems to radiated radio frequency (RF) disturbances in the frequency range from 80 MHz to 1 GHz were performed with measurement set up under the requirements specified in the electromagnetic compatibility (EMC) standards. The measurements were executed at over-normative field strengths of 15 V/m, 25 V/m, 35 V/m, 40 V/m, 45 V/m, and 50 V/m, respectively.

In laboratory conditions, the electromagnetic fields were simulated in the GTEM (Gigahertz Transverse Electromagnetic) cell (Fig. 1). An integrated signal generator, equipped with a built-in 45 W class A power amplifier module, was used in the measurement setup. The tested multivibrator was supplied from a battery of 9 V. The signal cable connected to the input of an oscilloscope was led out of the tested PCB. The measurement process was controlled by the WIN 6000 software installed on a personal computer connected to the signal generator via the IEEE488 interface.

A typical astable multivibrator was subjected to the immunity test. The proper operation of the device is indicated by flashing LEDs with variable frequency. The system sensitivity to the radiated field in the GTEM cell was assessed based on the observation of the differences in the shape between the signal waveform controlling diode switching and the reference waveform recorded with the signal generator turned off.  

The normative test procedure was carried out in the frequency range starting at 80 MHz and incrementing in 1% steps up to at least 1 GHz. The RF signal was modulated with a sinusoidal signal with a frequency of 1 kHz and a modulation depth of 80%. The position of the equipment under test (EUT) in the uniform area of the GTEM cell was changed for three orthogonal orientations x, y, z. Based on the results of measurements presented in [Ławniczak, P., & Pałczyńska, B. (2021). The standard radiated immunity test of an astable multivibrator at normative field strengths [Data set]. Gdańsk University of Technology.], it was found that the position y (vertical) of the EUT in the GTEM cell is the most susceptible to disturbances. Therefore, immunity tests at higher than standard levels of electric field strength were carried out only in the vertical position of the EUT for the previously selected RF signals.

The attached files contain oscillograms showing the voltage waveforms recorded from the PCB for the electromagnetic field strength equal to 15 V/m, 25 V/m, 35 V/m, 40 V/m, 45 V/m, and 50 V/m, respectively. For each case, information about the RF frequency of the signal generator is included in the file description.

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Figure 1. Configuration of the measuring system for testing the immunity of electronic systems
in the GTEM cell

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  • Automatyka, elektronika i elektrotechnika (Dziedzina nauk inżynieryjno-technicznych)
Identyfikator DOI 10.34808/8bj5-e318 otwiera się w nowej karcie
Politechnika Gdańska

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