Hello everybody in this new year. The most difficilt part for me to this situation is to remind me I have to type 1997 and not 1996 (no, not all is automated)!
Let me open a new subject item concentrating on the CHEAP equipment question for ROUGH pre-compliance limit testing before approved lab tests. If you agree, I like to concentrate the whole subject on the ECONOMICAL aspect. I'll quit on the Cenelec/BITP constrains in this NEW subject, I think my opignion and bad experiances where clear enough. I'll still "work" on it, you bet, and will comme back on it when new items appear under the old subject name. SUBJECT: Just to state a few of the general LOW COST items: - can anybody sugest cheap data, test and calibration equipment (other than the standard ones used in general complying with the more strict EMC regulations like for instance the CISP 16) - has anybody have experience with that "other than the standard" test equipment - what are the recomendations when using this type of equipment - what has to be modified (eventually) to make it a reasonable equipment - what has to be added to the equipment to ensure personel and equipment protection (I'm thiking of a LISN for instance) - how can I build equipment like antenna's - how can I calibrate (?) rougly all those devices? - How mutch due to the deviations from standard and special purpose equipment do I have to take in account (approx.) - ...... OPEN ...... Let me start the subject: 1. I use a NEAR field probe during the design phase of the project sold by Credence Technologies, Inc Santa Cruz, CA (free advertising!), Greenwood Electronic (UK) and somebody in the Netherlands (but more expensive at the first glance). I have very good experiance with this probe, efficient pinpointing the problem areas. It allows at least to: - detect the radiation area's on the Circuit board and other parts - gives valuable indications of improvements to the design - cost +/- $US 200 if I recall correctly - higly recommended (remark: I have NO financial or other interests). 2. I heard somebody using an electrostatic gas lichter to simulate "some" static discharges. Its modified with a ground wire and front protection cap removed. I'll find it a geneous idee ( a few $$). Who has experiance with it? 3. A scanner as a test receiver. The subject is open. I have a AOR AR 8000 scanner ranging for 100kHz to 1950 MHz, can be fully controlled by a external PC: scan freq., mode, bandwith, attenuator and a lot more. Maintenance manual with drawing can be obtained. Initil modifications required: - remove internal antenna used for braodcast (remove diode) - plastic outside box has to be shielded with conducting paint or by putting the whole in a metalic enclosure. Is currently under test. Anybody some more inputs on this subject? 4. It seems there is'nt a problem to construct Log-periodic antenna's. Construction data is available. Do not require special items as ballun's, etc. It seems more difficult to have data and to build Bi-conical or simular antenna's. Anybody can help? How good can avail calibrations data be used when the antenna is copied? Who can provide this data and info? Best regards -- Paul Rampelbergh Wezembeek-Oppem (Belgium) -------------------------
