---------- From: Edward O'Toole ITS/QS-Box To: [email protected] Subject: RE: ? on EN 50140 - help! List-Post: [email protected] Date: Tuesday, April 06, 1999 6:39PM
Testing to EN 50140, now EN61000-4-3:1996 is a much harsher test than the old IEC801-3:1984 Radiated Immunity Test. Many test facilities had to calibrate their Semi-anechoic chambers, to provide a uniform field. The forward power is measured and recorded when the field strength obtained is 3V/M or 10V/M (Unmodulated) 12 out of the 16 points on the specified grid have to lie within +/-3dB When the calibration is complete. The recorded values are then entered (usually into a software package). The E.U.T. is then moved into the room. Todays signal generators have an internal oscillator, so that you can just punch in the 80% modulation (Marconi) Beware, when you calibrate the room at 10v/m and now modulate the signal, expect to see a value of 18v/m. The old bicons stopped at various frequencies. Today there are Bilog antennas that can sweep from 80- 1000Mhz. Hope this helps! ---------- From: [email protected] To: [email protected] Subject: ? on EN 50140 - help! List-Post: [email protected] Date: Tuesday, April 06, 1999 1:58PM Could someone please clarify the following : the test procedure for EN 50140 states "the frequency range is swept from 80 MHz to 1000MHz, using the power levels established during the calibration process, and with the signal 80% amplitude modulated with a 1 kHz sinewave pausing to adjust the RF signal level or to switch oscillators and antennas as necessary" Does this mean that the modulation is to be turned on and off during the stepping or sweeping of frequency? I have never heard of doing this but I have been asked to respond to the question. Can anyone shed some light as to why someone would interpret it that way?? thank you!!! Lisa --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
