Although a TFT-monitor has no magnetic fields like a CRT-monitor it still emits some electric fields from the screen. This is measured before the screen of a digital scope:
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spikes (rise time 100nS) from the INPUT of a battery-powered
handheld multimeter measuring at 100uV resolution on a 10Mohm sample 2mS/div |
spikes from the INPUT of a high-end voltmeter measuring
at 100nV resolution on a 10Mohm sample, 1mS/div |
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spikes at the output of a commercial analog lowpass-filter set at 1kHz
(possible origin: it has a clocked LED-display at the front)
0.5mS/div, 5mV/div
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Interference on the INPUT of a (commercial)currentmeter
measuring at pA resolution, 1Mohm sample 200uS/div 200MHz |
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(lack of)Interference on the INPUT of a QT-design currentmeter
measuring at pA resolution, 1Mohm sample 200uS/div 200MHz |
Reference trace of the used scope, now with grounded input
200uS/div 200MHz |
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Although a TFT-monitor has no magnetic fields like a CRT-monitor it still emits some electric fields from the screen. This is measured before the screen of a digital scope: |
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