Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566975
Y. Sutu, J. Whalen
The computer program NCAP has been used to predict demodulation RFI effects in operational amplifier (op amp) circuits excited by 50% AM-modulated RF signals over the RF frequency range 0.1 to 400 MHz. The op amp circuit investigated is a unity gain buffer amplifier with 741 bipolar or LF355 JFET—bipolar op amps. The sensitivity of the RFI demodulation predictions to variations in model parameter values has been determined.
{"title":"The Sensitivity of Demodulation RFI Predictions in Op Amp Circuits to Variations in Model Parameter Values","authors":"Y. Sutu, J. Whalen","doi":"10.1109/ISEMC.1985.7566975","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566975","url":null,"abstract":"The computer program NCAP has been used to predict demodulation RFI effects in operational amplifier (op amp) circuits excited by 50% AM-modulated RF signals over the RF frequency range 0.1 to 400 MHz. The op amp circuit investigated is a unity gain buffer amplifier with 741 bipolar or LF355 JFET—bipolar op amps. The sensitivity of the RFI demodulation predictions to variations in model parameter values has been determined.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"9 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115730019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566956
H. Rahman, J. Perini
The motivation for this work was generated during the EMP testing of a ship. In order to collect data on the p o in ts o f in te r e s t , v o lta g e and c u rre n t probes were installed in hundreds of places in the ship and the data collected was transmitted to a recording station inside a shielded room, located somewhere in the ship. In order to communicate with this recording room, port able radios, in the VHF range were used. It surprised the authors that no matter where the transmitter was located, even several decks below the recording room, communication was established with no problem.
{"title":"Coupling to Wire Bundles in Rectangular Cavity","authors":"H. Rahman, J. Perini","doi":"10.1109/ISEMC.1985.7566956","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566956","url":null,"abstract":"The motivation for this work was generated during the EMP testing of a ship. In order to collect data on the p o in ts o f in te r e s t , v o lta g e and c u rre n t probes were installed in hundreds of places in the ship and the data collected was transmitted to a recording station inside a shielded room, located somewhere in the ship. In order to communicate with this recording room, port able radios, in the VHF range were used. It surprised the authors that no matter where the transmitter was located, even several decks below the recording room, communication was established with no problem.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125098265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566974
J. L. Smith, P. P. Maia
Recent designs of H F radio transmission systems have employed high power multichannel RF power amplifiers that feed a single broadband antenna system. These amplifier/antenna combinations operate with bandwidths that encompass the entire H F band and simultaneously amplify as many as 20 to 25 independent signals of arbitrary carrier frequency. The advantages of such an H F radio system include more effective utilization of assets, frequency agility, and greater efficiency. Along with the advantages, however, comes an increase in the number of intermodulation (IM) products that are generated when the multiple signals are amplified within the high power multichannel RF amplifier. The system designer must be knowledgeable of the impact of these intermodulation products. He must be able to determine what interference will be caused (if any) and to do this, he must know both the frequency and the level of the intermodulation products. The method for calculating the frequency of intermodulation products is well known. The means for predicting the level of the intermodulation products is less familiar to the system designer, especially when multiple signals of various power levels are involved and when intermodulation products of several orders and types are of concern. This paper introduces a means of providing a cursory prediction of the level of the intermodulation products generated by a high power multi channel RF amplifier and makes an effort to contribute to more effective frequency management techniques. D ESC R IPTIO N O F TH E IM PR OD UCT The transfer characteristic of the power amplifier can be expressed in the familiar form of an exponential series: N v0 = 2 an Vj eq. (1 ) n =1 Where v0 is the amplifier output signal, vj is the input signal and an are the non-linearity coefficients. When the input signal, vj, is the sum of several sustained carrier signals, the input voltage will be of the form: J Vj = 2 Ej cos W;t eq. (2 ) i=i When vi is raised to the various exponents as indicated by eq. (1), intermodulation products (IPr) are generated and take the form: IPr A r Kr EA a E g ^ E q 7 cos 27t (oA±|3B±7 C± . . .) t eq. (3 ) where r is the order of the intermodulation product, i.e., r= a + /? + 7 + ... A r is the transfer function coefficient Ea , E b , E c , etc. are the amplitudes of signals A, B, C, etc. Kr is a trigonometric expansion coefficient determined by the type of intermodulation product, (see Table I). If Ar is known, then the level of IP r may be calculated. However, seldom is this the case, and attempts at measuring Ar have been unsuccessful in the past. TH E PR ED IC TIO N FORM U LA We wish to have a means to calculate the amplitude coefficient of IPr without a numerical value for A r. This suggests that a ratio be used. A r appears in every intermodulation product of order r regardless of type, i.e., intermodulation products of type A + B + C , 2A4-B, 3A, etc. all contain the transfer function coefficient, A 3. Therefore, i
{"title":"A Method for Predicting Intermodulation Product Levels","authors":"J. L. Smith, P. P. Maia","doi":"10.1109/ISEMC.1985.7566974","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566974","url":null,"abstract":"Recent designs of H F radio transmission systems have employed high power multichannel RF power amplifiers that feed a single broadband antenna system. These amplifier/antenna combinations operate with bandwidths that encompass the entire H F band and simultaneously amplify as many as 20 to 25 independent signals of arbitrary carrier frequency. The advantages of such an H F radio system include more effective utilization of assets, frequency agility, and greater efficiency. Along with the advantages, however, comes an increase in the number of intermodulation (IM) products that are generated when the multiple signals are amplified within the high power multichannel RF amplifier. The system designer must be knowledgeable of the impact of these intermodulation products. He must be able to determine what interference will be caused (if any) and to do this, he must know both the frequency and the level of the intermodulation products. The method for calculating the frequency of intermodulation products is well known. The means for predicting the level of the intermodulation products is less familiar to the system designer, especially when multiple signals of various power levels are involved and when intermodulation products of several orders and types are of concern. This paper introduces a means of providing a cursory prediction of the level of the intermodulation products generated by a high power multi channel RF amplifier and makes an effort to contribute to more effective frequency management techniques. D ESC R IPTIO N O F TH E IM PR OD UCT The transfer characteristic of the power amplifier can be expressed in the familiar form of an exponential series: N v0 = 2 an Vj eq. (1 ) n =1 Where v0 is the amplifier output signal, vj is the input signal and an are the non-linearity coefficients. When the input signal, vj, is the sum of several sustained carrier signals, the input voltage will be of the form: J Vj = 2 Ej cos W;t eq. (2 ) i=i When vi is raised to the various exponents as indicated by eq. (1), intermodulation products (IPr) are generated and take the form: IPr A r Kr EA a E g ^ E q 7 cos 27t (oA±|3B±7 C± . . .) t eq. (3 ) where r is the order of the intermodulation product, i.e., r= a + /? + 7 + ... A r is the transfer function coefficient Ea , E b , E c , etc. are the amplitudes of signals A, B, C, etc. Kr is a trigonometric expansion coefficient determined by the type of intermodulation product, (see Table I). If Ar is known, then the level of IP r may be calculated. However, seldom is this the case, and attempts at measuring Ar have been unsuccessful in the past. TH E PR ED IC TIO N FORM U LA We wish to have a means to calculate the amplitude coefficient of IPr without a numerical value for A r. This suggests that a ratio be used. A r appears in every intermodulation product of order r regardless of type, i.e., intermodulation products of type A + B + C , 2A4-B, 3A, etc. all contain the transfer function coefficient, A 3. Therefore, i","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121933833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566968
D. Lawry
{"title":"Electromagnetic Pulse Test Aircraft (EMPTAC) Program","authors":"D. Lawry","doi":"10.1109/ISEMC.1985.7566968","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566968","url":null,"abstract":"","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129520167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566955
J. A. Cameron
{"title":"The Effects of Induced Cable Currents on Electric and Magnetic Field Measurements","authors":"J. A. Cameron","doi":"10.1109/ISEMC.1985.7566955","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566955","url":null,"abstract":"","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129316037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566908
G. Perroton
In 1 ightning or EMP protection problems it is sometimes necessary to take into account very high level trans ients collected by the commercial power line. These high transients may occur in cases of direct lightning strikes on the line, or in cases of EMP due to low altitude burst or ground burst close to the 1 ine. In these cases the classical protection devices are not adequate because in general arresters cannot withstand energies higher than a few tens kJ. The goal of the presentation is to show the limita tions of classical protection devices and to present different solutions to solve this problem. 1. LIMITATIONS OF CLASSICAL PROTECTION DEVICES Experience has shown that an effective way to deal with abnormal lightning or EMP overvoltages on power lines is to divert them to earth by the means of surge arresters. Surge arresters are constitued of sparkgaps in series with silicon carbide blocks which form the basis of a non linear resistor so that currents due to the n o r m a l voltage could be extinguished by series gaps while the overvoltages are limited by the much larger currents they can divert to earth. While gaps are able to divert to earth large amount of charge (in terms of coulombs), surge arresters have a lower limit for charge flowing because of energy deposited in the silicon carbide block. This limit in charge flowing capability is also dependent on the number of discharges and time beetween discharges. To increase this capability is not easy because the designer must deal with many parameters such as : functionnal service voltage, time response of the arrester, maximum current discharge withstanding, maximum voltage drop in the arrester when current is f1owing, mechanical and geometrical characteristics taking into account insulation levels, characteristics of the power network (neutral earthing, etc ...). This means that the order of magnitude of charge withstanding of 240/415 V arresters is in general tens of coulombs or in terms of energy tens (up to a few hundreds) of kJ. It is also necessary to take into account that spark gaps and arresters keep some memory of the previous charges that they have had to withstand.
在雷电或电磁脉冲保护问题中，有时需要考虑商业电力线收集的高电平瞬变。这些高瞬变可能发生在线路上受到直接雷击的情况下，或者在靠近线路的低空突发或地面突发造成电磁脉冲的情况下。在这些情况下，传统的保护装置是不够的，因为一般避雷器不能承受高于几十千焦的能量。本次演讲的目的是展示经典保护装置的局限性，并提出解决这一问题的不同解决方案。1. 传统保护装置的局限性经验表明，处理电力线上异常雷击或EMP过电压的有效方法是利用避雷器将其引至地球。浪涌避雷器是由一系列的火花隙和碳化硅块组成的，这些火花隙构成了非线性电阻的基础，因此由于n / m / l电压引起的电流可以通过串联间隙熄灭，而过电压则受到它们可以分流到地球的大得多的电流的限制。虽然间隙能够将大量电荷(以库仑计)转移到地面，但由于沉积在碳化硅块中的能量，避雷器具有电荷流动的下限。电荷流动能力的限制也取决于放电次数和放电间隔时间。要增加这种能力并不容易，因为设计者必须处理许多参数，如:功能使用电压、避雷器的时间响应、最大电流放电承受能力、电流流动时避雷器的最大压降、考虑绝缘等级的机械和几何特性、电网特性(中性点接地等)。这意味着240/415 V避雷器承受电荷的数量级通常是几十库仑或能量几十(高达几百)kJ。还必须考虑到火花隙和避雷器对以前必须承受的电荷保持一定的记忆。
{"title":"How to Protect Hardened Facilities from Very High Level Transients Induced on Power Line by Lightning or EMP","authors":"G. Perroton","doi":"10.1109/ISEMC.1985.7566908","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566908","url":null,"abstract":"In 1 ightning or EMP protection problems it is sometimes necessary to take into account very high level trans ients collected by the commercial power line. These high transients may occur in cases of direct lightning strikes on the line, or in cases of EMP due to low altitude burst or ground burst close to the 1 ine. In these cases the classical protection devices are not adequate because in general arresters cannot withstand energies higher than a few tens kJ. The goal of the presentation is to show the limita tions of classical protection devices and to present different solutions to solve this problem. 1. LIMITATIONS OF CLASSICAL PROTECTION DEVICES Experience has shown that an effective way to deal with abnormal lightning or EMP overvoltages on power lines is to divert them to earth by the means of surge arresters. Surge arresters are constitued of sparkgaps in series with silicon carbide blocks which form the basis of a non linear resistor so that currents due to the n o r m a l voltage could be extinguished by series gaps while the overvoltages are limited by the much larger currents they can divert to earth. While gaps are able to divert to earth large amount of charge (in terms of coulombs), surge arresters have a lower limit for charge flowing because of energy deposited in the silicon carbide block. This limit in charge flowing capability is also dependent on the number of discharges and time beetween discharges. To increase this capability is not easy because the designer must deal with many parameters such as : functionnal service voltage, time response of the arrester, maximum current discharge withstanding, maximum voltage drop in the arrester when current is f1owing, mechanical and geometrical characteristics taking into account insulation levels, characteristics of the power network (neutral earthing, etc ...). This means that the order of magnitude of charge withstanding of 240/415 V arresters is in general tens of coulombs or in terms of energy tens (up to a few hundreds) of kJ. It is also necessary to take into account that spark gaps and arresters keep some memory of the previous charges that they have had to withstand.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130333282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566941
M. Samarkandy
It was 14th of April 1976 when all Arab countries agreed to form the "Arab Satellite Communications Organization" stationed in its headquarter Riyadh, Saudi Arabia. The main objectives of the organization is to establish, operate and maintain a regional satellite system called "ARABSAT" that will provide telecommunication services, sound and television broadcasting for all Arab countires. This paper discusses the operation and technical characteristics of the ARABSAT System. Arab Satellite Communications Organiation (ASCO) On 14th of April 1976, members of the Arab League agreed to form an organization called ASCO (Arab Satellite Communications Organization), stationed in its headquarter Riyad, Saudi Arabia. The organization consists of 21 member countries, headed by Saudi Arabia. They are: The Kingdom of Saudi Arabia, the Libian Arab Republic, The Arab Republic of Egypt, the State of Kuwait, the United Arab Emirates, Lebanon, The State of Qatar, the State of Bahrain, the Hashemite Kingdom of Jordan, the Republic of Iraq, the Democratic Republic of Sudan, the Syrian Arab Republic, the Sultanate of Oman, the Algerian Democratic and Popular Republic, the Arab Republic of Yemen, Tunisia, the Kingdom of Morocco, the Somali Democratic Republic, the Islamic Republic of Mauritania, Palestine and the People's Democratic Republic of Yemen. The objective is to create a regional satellite system for the Arab countries to serve general telecommunication services. The shares of the member states in the organizations is shown in Table I. The organization has a General Assembly, a Board of Directors and an Executive Organ. The General Assembly is the highest authority in the organization and is formed from the Ministers of Communications in charge of telecommunications in the member Arab States or whom they authorize. Table I. SHARES OF THE ARAB STATE COUNTRIES IN "ASCO" Arab State Countries Amount of shares {%) Saudi Arabia 26.2 Libya 18.5 Egypt : 10.4 Kuwait 8.3 Egypt 10.4 Lebanon 6.3 Qatar 5.0 Bahrain 4.0 Jordan 3.3 Qatar 5.0 Sudan 2.1 Syri a 1.7 Oman 1.0 Algeria 0.9 Sudan 2.1 Tunisia 0.6 Morocco 0.5 Somalia 0.3 Mauritania 0.2 Sudan 2.1 Yemen (P.D.R.) 0.1 100.0 ARABSAT Satellite System The main objectives of the ASCO organization is to establish, operate and maintain a regional satellite system for the Arab countries called "ARABSAT", to serve general telecommunication services such as telephone data transmission, telex and telegraphy, radio and television broadcasting. Societe nationale Industrielle Aerospatiale (SNIAS)-, France in cooperation with its partner Ford Aerospace and Communication Corporation (FACC)-, U.S.A. have submitted a proposal (1) to ASCO for the production and delivery of three communications satellites and the provision of related services.
{"title":"Communication Satellite System for the Arab State Countries - Arabsat","authors":"M. Samarkandy","doi":"10.1109/ISEMC.1985.7566941","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566941","url":null,"abstract":"It was 14th of April 1976 when all Arab countries agreed to form the \"Arab Satellite Communications Organization\" stationed in its headquarter Riyadh, Saudi Arabia. The main objectives of the organization is to establish, operate and maintain a regional satellite system called \"ARABSAT\" that will provide telecommunication services, sound and television broadcasting for all Arab countires. This paper discusses the operation and technical characteristics of the ARABSAT System. Arab Satellite Communications Organiation (ASCO) On 14th of April 1976, members of the Arab League agreed to form an organization called ASCO (Arab Satellite Communications Organization), stationed in its headquarter Riyad, Saudi Arabia. The organization consists of 21 member countries, headed by Saudi Arabia. They are: The Kingdom of Saudi Arabia, the Libian Arab Republic, The Arab Republic of Egypt, the State of Kuwait, the United Arab Emirates, Lebanon, The State of Qatar, the State of Bahrain, the Hashemite Kingdom of Jordan, the Republic of Iraq, the Democratic Republic of Sudan, the Syrian Arab Republic, the Sultanate of Oman, the Algerian Democratic and Popular Republic, the Arab Republic of Yemen, Tunisia, the Kingdom of Morocco, the Somali Democratic Republic, the Islamic Republic of Mauritania, Palestine and the People's Democratic Republic of Yemen. The objective is to create a regional satellite system for the Arab countries to serve general telecommunication services. The shares of the member states in the organizations is shown in Table I. The organization has a General Assembly, a Board of Directors and an Executive Organ. The General Assembly is the highest authority in the organization and is formed from the Ministers of Communications in charge of telecommunications in the member Arab States or whom they authorize. Table I. SHARES OF THE ARAB STATE COUNTRIES IN \"ASCO\" Arab State Countries Amount of shares {%) Saudi Arabia 26.2 Libya 18.5 Egypt : 10.4 Kuwait 8.3 Egypt 10.4 Lebanon 6.3 Qatar 5.0 Bahrain 4.0 Jordan 3.3 Qatar 5.0 Sudan 2.1 Syri a 1.7 Oman 1.0 Algeria 0.9 Sudan 2.1 Tunisia 0.6 Morocco 0.5 Somalia 0.3 Mauritania 0.2 Sudan 2.1 Yemen (P.D.R.) 0.1 100.0 ARABSAT Satellite System The main objectives of the ASCO organization is to establish, operate and maintain a regional satellite system for the Arab countries called \"ARABSAT\", to serve general telecommunication services such as telephone data transmission, telex and telegraphy, radio and television broadcasting. Societe nationale Industrielle Aerospatiale (SNIAS)-, France in cooperation with its partner Ford Aerospace and Communication Corporation (FACC)-, U.S.A. have submitted a proposal (1) to ASCO for the production and delivery of three communications satellites and the provision of related services.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115879077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7567001
J. M. Clemmensen, R. Ferraro, John D. Meloy
Power-line conditioners, power-line isolators, and other harmonicand noise-reduction devices are often used where sensitive loads must be protected from sources of excessive harmonics and noise. Several features of these devices are discussed including frequency-dependent attenuation of harmonics and noise, the degree of isolation of load noise from the power line, voltage resonant effects with loading, and unloaded power consumption.
{"title":"Power-Line Harmonic and Noise Reduction Devices: Some Measured Features","authors":"J. M. Clemmensen, R. Ferraro, John D. Meloy","doi":"10.1109/ISEMC.1985.7567001","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7567001","url":null,"abstract":"Power-line conditioners, power-line isolators, and other harmonicand noise-reduction devices are often used where sensitive loads must be protected from sources of excessive harmonics and noise. Several features of these devices are discussed including frequency-dependent attenuation of harmonics and noise, the degree of isolation of load noise from the power line, voltage resonant effects with loading, and unloaded power consumption.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130190670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566918
Glen Dash
T h e e f f e c t o f v a r y i n g t h e p l a c e m e n t o f I / O c a b l e s w h i l e p e r f o r m i n g r a d i a t e d e m i s s i o n m e a s u r e m e n t s t e s t s o n c o m p u t i n g e q u i p m e n t h a s b e c o m e a k i n d o f a p a r a d o x i n t h e EMC c ommu n i t y . F o r a n y o n e w h o h a s o b s e r v e d t h e f a c e o f a s p e c t r u m a n a I y z e r wh i I e mo v i n g I / O c a b l e s , e s p e c i a l l y t h o s e a t t a c h e d t o d e s k t o p c o m p u t i n g e q u i p m e n t , t h e p r o b l e m i s c l e a r . Ra d i a t e d e m i s s i o n s v a r y d r ama t i c a I I y , b y 2 0 dB o r m o r e , w h e n I / O c a b l e s a r e m o v e d f r o m o n e p o s i t i o n t o a n o t h e r . r e l a t i v e l y s m a l l m o v e m e n t s c a n d r a m a t i c c h a n g e s i n e m i s s i o n s , t i m e w h e n s t a n d a r d s c o mm i t t e e s f e v e r i s h l y a b o u t 2 dB e r r o r s i n t h i n g s a s e q u i pme n t c a l i b r a t i o n a t t e n u a t i o n , t h e r o l e t h e s e c o m m i t t e e s h a v e p l a y e d i n Even c a u s e A t i wo r r y such and site s t a n d a r d s d e f i n i n g j u s t h o w I / O c a b l e s s h o u l d b e p o s i t i o n e d w h e n t e s t i n g c o m p u t i n g e q u i p m e n t h a s b e e n p a r a d o x i c a l l y s i l e n t . J u s t h o w c a b l e s s h o u l d b e p o s i t i o n e d i n o r d e r t o a c h i e v e r e p e a t a b l e r e s u l t s w h i c h r e p r e s e n t t h e t r u e i n t e r f e r e n c e c a p a c i t y o f t h e e q u i p m e n t u n d e r t e s t i s , i n t h e a u t h o r ' s o p i n i o n , b y f a r t h e s i n g l e m o s t p r e v a l e n t f a c t o r i n t h e f a i l u r e o f v a r i o u s s i t e s t o r e p r o d u c e eac ' h o t h e r ' s d a t a . Y e t no s t a n d a r d h a s erne r g e d w h i c h f u l l y a n d c l e a r l y d i s c u s s e s t h e p r o c e d u r e s t o b e u s e d , n o r i s t h e r e a n y t h i n g c l o s e t o an a g r e e m e n t o n w h a t f o r m t h o s e p r o c e d u r e s s h o u l d take.
I / O c a b l e s w h i l e p e r f o r m i n g v a r y i n g t h e p l a c e m e n t o f I / O c a b l e s w h i l e p e r f o r m i n g在 EMC c ommu n i t y 中 ， I / O c a b l e 的 p l c e m e n t w h i l e p e r f o r m i n g a s u r e m e n t s t a n d q u i p m e n t h a c o m e a k i n d o f a p a r a d o x i n t h e EMC c ommu n i t y 。对 于 任 何 一 个 人 来 说 ， 如 果 他 们 认 识 到 了 一 个 可 行 的 方 法 ， 那 么 他 们 就 可 以 通 过 I / O c a b l e s 、e s p e c i a l y t h o s e a t a c h e d o d e s k t o p c o m p u t i n g , t h e p r o b l e m s c l e a r .Ra d i a t e d e m i s s i o n s v a r y d r ama t i c a I I y , b y 2 0 dB o r m o r e , w h e n I / O c a b l e s a r m o v e d f r o m o n e p o s s i b l e .在这种情况下，I / O c a b l e 会从 o n e p o s s i o n s 、2 dB e r r o r s i n t c a l l i l i b o u t 2 dB e r r o r s i n t c a l l i b r a t i o n 、甚至认为 A t i wo r r y such a n d s e t t a n d a r d s d e f i n i n g j u s t h o w I/ O c a b l e s s h o u l d b e o p o s i t i o n e d w h e n t e s t i n g c o m p u t i n g a n d q u i p m e n t h a e n p a r a d o x i c a l l y s i l e n t .J u s t h o w c a b l e s s h o u l l d b e p o s i t i o n e d to c l e a t e p e a t a b l e r e s u l t s w h i c h r e s e s u l t在这种情况下，就会产生一种"'..、在儿童的生活环境中，通过对儿童的生活环境的干预，可以提高儿童的生活质量。我们的目标是，在全球范围内，通过对人类活动的研究和分析，为人类的生存和发展做出贡 献、在这种情况下，我们应该采取什么样的行动？
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Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566986
E. Bronaugh
The forthcoming SAE J1507 information report on f a c i l i t i e s and procedures fo r tes ting the suscept i b i l i t y (immunity) o f large complex systems to radiated electromagnetic energy is reviewed with the objectives o f h igh lighting potential te s t problems and describing a p rac tica l re a l iz a t io n o f an auto mated instrumentation system to perform the tes t in g . SAE J1507 s p e c i f ic a l ly addresses the tes t in g o f oper ating motor vehicles including passenger cars, buses, large trucks, e t c . , over the range o f frequen cies from 20 MHz to 18 GHz, but the f a c i l i t i e s , tech niques and procedures are equally applicable to other large , complex e lec tro n ic and electromechanical systems.
即将到来的SAE J1507信息报告f c我l t e s和程序fo r te ting感病体-我b l t y(免疫力)o f大型复杂系统综述了辐射电磁能量与目标o f本照明潜在te s t问题和描述一个p rac行业l是l工业区t io n o f汽车-交配执行tes t在g的仪器系统。SAE J1507标准主要针对机动车辆(包括乘用车、公共汽车、大型卡车等)的运行安全问题。在20兆赫至18千兆赫的频率范围内，我们的技术和程序同样适用于其他大型、复杂的电子和机电系统。
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