Examples Of Disturbed Useful Signals - LANGER EMV-Technik A100 User Manual

LANGER
DE-01728 Bannewitz
mail@langer-emv.de
EMV-Technik
www.langer-emv.com

1.6 Examples of disturbed useful signals

- Signals were measured with the AS 100 optical fibre probe
- Radiated RF emissions: 250 MHz, 80 % amplitude-modulated by 1 kHz
- DUT: operational amplifier circuit; RF coupling via an operational amplifier input; the disturbance
signal was measured on the output.
A100 / A200 / A300
Figure 1 The oscillogram shows a constant useful
signal with a demodulated 1 kHz component.
Figure 2 The demodulated 1 kHz disturbance signal,
superimposed on the useful signal, shows a large
harmonic component.
Figure 3 The demodulated 1 kHz disturbance signal
is limited by the lower rail.
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