Brent, Lets not forget to mention that some have chosen to turn the RF on and off as well as the modulation because not all signal generators are created equal. Some signal generators create such high transients while switching that the RF must be turned off before going to the next frequency step.
____________________________________________ Kevin J. Hight -- Regulatory Compliance Engineer Exabyte Corporation 1777 Exposition Drive, Building #7 Boulder, Colorado 80301 Phone: 303-417-5534; Fax: 303-417-5710 Pager: 303-855-7029; Email: [email protected] -----Original Message----- From: Brent DeWitt [mailto:[email protected]] Sent: Tuesday, April 06, 1999 4:49 PM To: [email protected]; [email protected] Subject: RE: ? on EN 50140 - help! If I understand the question correctly, the answer is more practical than regulatory. The "calibration process" is done _without_ modulation and the forward power stored for "playback". Since the effect of the modulation is not the same on all power meters, the controlling program usually will turn the modulation off, level the power, then turn the modulation on for the specified dwell period. There is some debate as to whether the act of turning the modulation on and off actually introduces a higher frequency modulation of the carrier, since few signal generators (none that I know of) turn their modulation on and off at zero crossing of the modulating waveform. Best regards, Brent DeWitt Datex-Ohmeda Medical Louisville, CO > 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).
