RTCA experts – I’m trying to figure out if I am reading Section 20 correctly with regard to modulation and test level.
Section 20.3 c) has the below, and Figure 20-5 is attached. The amplitudes associated with the categories are based on the peak of the rms envelope over the complete modulation period as shown in Figure 20-5. Amplitude measurements shall be made in a manner which clearly establishes the peak amplitude of the modulated waveform. For radiated susceptibility, the field probe is reading RMS - so you calibrate to the correct level per 20.3 and 20-5, then playback your forward power. For conducted though, your calibration is done with a receiver, spectrum analyzer, or power meter. Those can measure peak or average. If you calibrate by measuring peak on the spectrum analyzer, do you have to divide the category level by .707 to set the required value? So for example, Cat Y at 300 mA would actually need to be 424.3 mA on your spectrum analyzer(ignoring pads, etc.)? If you calibrate in peak without using the .707 factor are you under testing? Thanks,David - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
