EN 61000-4-5 Surge on 24VAC equipment

2001-12-22 Thread Jim Ericson
I see your point, but as I understand it, only if the power pack is made available with the apparatus to the end user, i.e. a system. This is up to the manufacturer to define. 1. Many 24 VAC products are shipped with a separate 230/24VAC transformer unit that plugs into the mains. In this

Re: High Frequency Pre-amp

2001-12-22 Thread Ken Javor
I don't understand the distinction being made here. I understand that a sensitive preamplifier is more easily saturated than one with lower gain or noise figure, but I don't understand why other things equal a Mini-Circuit preamp would be more prone to saturation than a MITEQ. Please explain.

Re: noise figure

2001-12-22 Thread Ken Javor
Take the limit you are measuring to, and subtract the transducer factor and any cable losses. That yields the receiver signal in dBuV which corresponds to a spec level signal. Subtract off a factor for how much you want the receiver noise floor to be below the spec level, typically 6 dB. Call

Re: New China Compulsory Certification

2001-12-22 Thread Leslie Bai
As officially announced on December 7th, 2001, CCC mark will take effective from May 1st 2002, replacing current CCIB (Safety) mark and CCEE (Great Wall) mark. I am currently in touch with relevant Chinese authorities for details. Leslie cecil.gitt...@kodak.com wrote: From: Cecil A.

RE: High Frequency Pre-amp

2001-12-22 Thread Brent DeWitt
Robert brings up a very good point. It is the main difference between a $4 ERA monolithic amp from MiniCircuits and a packaged $1200 Miteq amp. While saying that, I think MiniCircuits is a great company with a range of products that are well characterized and worth every penny. Regards, Brent

noise figure

2001-12-22 Thread KC CHAN [PDD]
Hi all It may not be purely EMC question, actually it is RF related, but I am sure the experts here can answer my questions. We all know that we need to have a pre-amp. that is as lower noise figure as possible, but how low it is enough or how it is related to the noise floor viewed by a

Re: surges on 24VAC

2001-12-22 Thread John Woodgate
I read in !emc-pstc that John Juhasz jjuh...@fiberoptions.com wrote (in 2a1845f4cde8d511b4400090279c703b14e...@bctexc10.na.ilxi.net) about 'surges on 24VAC', on Fri, 21 Dec 2001: The functional circuit operates off of 24V AC, but the primary power is AC Mains - whether it's supplied through a