PCI system description
Contents
1. A mon tena 3 Pulse generators and control units The test system described in this document comprises four pulse generators designed and built by Montena Each generator can be either directly controlled or remotely controlled via its RS232 or USB interface 3 1 Short pulse generators amp control units To fulfil the MIL STD test specifications gt 5000 A with 60 Ohm the short pulse generator has to deliver more than 300 kV Additionally to be able to test different tyoe of POE protecting devices it should be possible to perform tests at lower voltage some tens of kV lt is physically not possible to design a Marx generator for the whole required voltage range 10 kV 300 kV Two generators are proposed e EMP80K 5 500 a 80 kV direct discharge pulse generator 10 kV 80 kV e EMP300K 5 500 a 350 kV high voltage Marx generator 50 kV 350 kV 8 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com p montena 80kV Short Pulse Generator This generator is built around one single stage of high voltage capacitors directly charged from a high voltage power supply The system comprises the high voltage unit and the control unit pewon oant Figure 5 Picture of an EMP80K 5 500 with its control unit Specifications Type EMP80K 5 500 Standard MIL STD 188 125 1 and 2 short pulse Peak open ci2. Montena designs builds and markets equipment and accessories for EMC tests The range of products includes antennas TEM cells striplines field sensors all kind of pulse generators test benches etc Montena s high voltage pulse generators are mainly used for EMC tests ultra rapid imaging and pulsed light decontamination Montena also builds pulse generators according the custom specific needs Figure 2 some montena products 1 2 NEMP test installations In the past years montena has designed build and delivered many test installations for both conducted and radiated susceptibility NEMP tests The list below shows typical examples of delivered test installations NEMP test generator 320 kV 2 8 25 ns with control unit 4 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com lt montena NEMP test generator 12kV 5 200 ns NEMP test generator 75 kV 2 8 25 ns with radiation line 1 8 m high for test according to MIL 461E RS105 NEMPP test radiation line 12 m high NEMP test generator 120 kV 2 8 25 ns with radiation line 2 7 m high NEMP test generator 230 kV 2 8 25 ns with radiation line 3 6 m high 5 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com ae montena High voltage pulse generators for Pulse Current I
3. montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com ie montena 8 Control and data acquisition system 8 1 Data acquisition software Montena proposes a customized data and acquisition software to ease the test procedure and to reduce the risk of human errors This software is developed by montena with Labview specifically for this test setup CS 116 Generator Computer Injection Probe Current A 1 1 1 1 1 1 Li 100n 120m 140n 160 180n 200m 220m Time s Current A II D ti MELE 1 BE On pk Ca ka Epa CALMBATION ERPORT caj I043007 17 34 MI CURRENT LIMIT FREGRIESNCET RAP CALINRATICH RESULT SU MRIA AT Tawi freq Limit Car A Charp Yok Ye Mane Car Al 10 bitr ap ao k Bi kliz ap man L kit Lo alH Leo la ct lapo lapo lant la pp TAG 00 1H a0 Figure 12 Example of a automatically generated test report 19 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com A mon tena The proposed software is built with the existing basic blocks developed by montena to control the generators and the measurement equipments to collect measured data
4. and to process the data for display and automatic report generation The software contains calibration panels to set the correction factors of sensors and transmission links The software can be designed according to the specific customer s needs of the PCI test system operation and will be presented to the end customer for approval before its final implementation Montena delivers the software as well as the source code The end customer has then the possibility to extend modify this software according future needs Of course montena can also be mandated for these eventually future adaptations 20 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com a montena 9 Shielded container Optionally montena can propose a shielded container to be used as control room and eventually to store the test equipment when not used Montena would propose a shielded container from RUAG www ruag ch RUAG is a Swiss company active in the Aviation amp space Defense amp security and in Ammunition Since decades RUAG delivers NEMP shielded containers for civil protection and military applications The container is a standard 8 ft x 8 ft x 20ft transportable container as shown in the picture below The container has the following equipment e Walls and ceiling are made of steel e Door without window e Wooden floor with non slip and abrasion resist
5. Current rise time short circuit 20 ns Current pulse length short circuit 500 550 ns FWHM Charging time lt 1 min Insulation SF and No Output connector custom connecting bar Interface RS 232 and USB on control unit Power rating 210 250 Vac 50 60 Hz 600 VA Storage working temperature 5 50 C 10 45 C Dimensions control unit generator 45x19x 56cm 60x 42x 188 cm W x H x L Weight control unit generator montena technology sa 1728 Rossens www montena com 13 175 kg 10 24 Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 e mail products montena com A Mon tena 3 2 Intermediate pulse generator amp control unit This generator is built using a direct discharge of high voltage capacitors Figure 7 Picture of an IPP3K 4MS pulse generator Specifications Type IPP3K 4MS Standard MIL STD 188 125 1 and 2 intermediate pulse Charging voltage 3 0 kV max positive only Peak short circuit current 10 A 260 A Source impedance gt 10 Q typically 11 Q Pulse shape double exponential waveform Typical current rise time short circuit 0 6 us Typical current pulse length short circuit 3 4 ms FWHM Charging time lt 45 sec Output connectors 4 outputs safety connectors Interface RS 232 USB Power rating 200 V
6. The inductive coupler shown below can be used for the short pulse common mode coupling on any type of cable bundle It allows the injection of the pulsed current without interrupting the cable bundle to test Figure 9 Picture of the inductive coupler Specifications Type IC3B Frequency range 180 kHz 60 MHz 0 10dB Maximum peak voltage 100 kV 500 ns pulse Maximum peak current 25kA Max diameter of the tested cable 63 mm Connector rings terminals Weight 55 kg Dimensions W x H x L 21 x 25x 77 cm 14 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com A mon tena 4 2 Capacitive couplers and isolation devices The capacitive couplers shown below can be used for the wire to ground coupling of the short pulse on any type of cables They allow the injection of the pulsed current when the cables are in services The different versions are adapted to the signal or to the mains supply connexions The capacitive coupling can be combined with the isolating network DS3 or DL3 See the chapter 5 Isolating devices for more information on the isolation network Specifications Reference Figure 10 Picture of a capacitive coupler CCS3 DS3 CCL3 DL3 Type of signal signal signal mains supply mains supply Type coupler decoupling box coupler decoup
7. up to 155 MBit s For a single Ethernet 10 100 MBit s application two 2 protectors are necessary one protector for one wire pair Digital telephony line filters Two NEMP low to medium data rate protectors up to 2MBit s VHF test filters Two NEMP VHF antennas lines filter DC 1000 MHz 23 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com A mon tena 11 Services 8 Support 11 1 Manuals and documentation The provided documentation comprises e Asystem level installation and user manuals e Installation and user manuals of each delivered equipment e An installation and user manual for the data and acquisition software e Source code of the data and acquisition software 11 2 Onsite installation and training Montena provides worldwide onsite installation performed by montena s engineers with help of skilled and unskilled workmen provided by the customer A comprehensive training session is offered and will be given directly after installation This training will be provided by an engineer from montena and includes the test system installation operation and maintenance The content of the training sessions will be defined according to the end customer desires 11 3 System acceptance The test system acceptance procedure is performed with a verification of the generated test pulses and comprises e
8. A mon tena Pulsed Current Injection Test System according to MIL STD 188 125 1 amp 2 System Description Version 4 0 montena technology sa 1 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com A mon tena Table of content ohm WN M ESE NOUKRAR OHHWW N HoH i l unl i Oo x a n n N h Q 11 4 MONTEI oo eta e a nn e a e a a n a e n jn a ek el n ase er 3 PRODUCT ranted teat il vite lit ti n vl cat kile E a l ia a ta kdk v e e tik ata e ak ka a a bk n kt ke 4 NEMP TEST INSTALLATIONS scart il isi dl w tt a kaki da a n e e a n il e a n l usando ka kk n n a kk kn kn e a n 4 OTHER MIL STD REFERENCES 2ccccececececcececececcccececaccccececacueccaucececsecessuaeaeausecscacauausesscseauausesscauacauaueesscseass 6 PGITEST System CESCIIDU OM eee ni ke at am n ek e a ank l n n ak a n e e a n a ak b 7 Pulse generators and control UNINS ese isk kika even ni a ok ao k s son ka kisa sisan ko kok ondan nnmnnn mnnn 8 SHORT PULSE GENERATORS amp CONTROL UNITS ccccccccccccccccccccccccccceacauaeceneauauaeaesuaeauacaeaeauaeaeaeaeauauauaeaeaeaeseseaeaees 8 INTERMEDIATE PULSE GENERATOR amp CONTROL UNIT cccccccccccccccccccceccccccacccceacaeacaeaeaeseseaeaeauauaeaeaeauaeeseseseaeaeass 11 CHARGE LINE PULSER soc swis dj g t vott sise ws vl dil an a e a a l n kt does rencseeesededseseuseace
9. A measurement of the generated current and voltage pulses e A measurement of residual current and voltage pulses behind the provided NEMP filters e Acomparison with the typical specifications of the filters The acceptance comprises two phases e AFAT factory acceptance test at Montena in Switzerland to demonstrate the system performance one week for 2 people from the end customer e ASAT site acceptance test performed at the end customer location after the system installation An acceptance report is delivered and signed by both the end customer and montena The warranty period starts at the signature of this acceptance document 11 4 Maintenance No periodical maintenance other than calibration of the measurement equipment is required On customer request montena can offer this calibration service with support of montena s authorized local representative 24 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com
10. Optic Generator Transmitter Filter Pulse l Generator Fiber Optic Controller Receiver Data acquisition l Oscilloscope amp Analysis P C Printer Shielded Measurement Container Figure 4 Schematic of a typical PCI test setup installation The pulse generators deliver the high energy pulses either directly or through coupling devices in the cable under test The pulse enters the facility under test through the point of entry protective devices An oscilloscope collects the measurements from the current and voltage sensors for display and eventually storage in the control PC In order to ensure correct measurement the sensors are connected using fibre optic links The measurement and control systems are installed in a shielded measurement container Pulse shapes Montena s PCI test system is able to perform pulsed current injection tests according MIL STD 188 125 1 8 2 except for the long pulse The long pulse is practically not used as it is technically almost impossible to realise and as it does only make sense for very long electrical lines which are no more used in telecommunication o ehenpuse f Intermediate pulse Charge ine pulse 7 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com
11. Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com A mon tena 4 Pulse coupling devices The pulse generator have to be somehow connected to the cable under test as shown in Figure 4 Schematic of a typical PCI test setup installation In this document we propose some solutions for a coupling on following typical types of cables connexions e shielded cables e mains AC DC supply 2 wires 50 A 230 Vac Or 60 Vac e signal data telecom cables 4 wires 1 A 60 Vac A Short pulse coupling The coupling can be direct inductive or capacitive depending from the type of cable to be tested and if the cable has to be tested when in service The output of the short pulse generators EMP300OK 5 500 and EMP80K 5 500 are acting as mechanical switches This means the output can be connected to any kind of cable even if this cable is carrying a signal or power See the different types of proposed couplers in the next paragraphs B Intermediate pulse coupling Because of the low frequency content of the intermediate pulse neither capacitive nor inductive coupling is possible Very high capacitance inductance would be required for the coupling efficiency And these very high capacitance inductance would drain high current from the device or from the source connected to the line under test The intermediate pulse generator IPP3K 4MS has 4 independent outputs which can be connec
12. ant vinyl flooring e Under floor protection outside e Electrical installations 5 x double 230V and 5 x RJ45 for 5 working places e Air conditioning 4 5 kW e External power supply through lightning protection box and insulating transformer 230V 35A e Coaxial feed through connector e Optical fibre cable entry e Standard locking system and is delivered with following furniture e 1x19 rack 600 x 700 x 1800 mm e 1x table for 5 working places with 5 x chairs e 1 x3 drawers file cabinet 21 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com ae montena Figure 14 Proposed internal furniture lt remains always possible to define the exact internal configuration during the execution of the project 22 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com p montena 10 Electric POE protective devices A set of NEMP filters can be optionally proposed to perform FAT SAT and other types of calibration or reference tests The recommend list of filter samples comprises AC power line filters One NEMP AC power line filter for 4 lines 3L 1N 400 230V 50 60Hz for up to 40Amp DC power line filters Two NEMP DC power line filters for a DC powering up to 30V DC 10A Data line filters Two NEMP fast data protectors
13. eseseoeseseoeoeoaseseoesaoeeoooeen 24 SYETEMACL EPI ANNO TE ek ee eee eee 24 FWI AA T MANNO a ia at ie t tir a caves e at cust a a te aa a l ty fe a a a ak kk e t ak apt at e A Ne yo 24 V Marketing Prospectus SystemDescriptionDocuments System_description_PCI_Tests_V40 doc 2 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com ae montena 1 Montena Montena started in 1903 with as capacitor manufacturing company In 1978 montena emc was created to address the arising emc problems Since then montena has earned a worldwide reputation for its leading edge skills in the fields of high voltage high frequency and electromagnetic fields Montena has the number one EMC test lab in Switzerland With two large anechoic chambers an open area test site and multiple shielded rooms montena can test and validate all kinds of equipment Figure 1 Montena emc headquarters helicopter in an anechoic chamber Montena can count on highly specialized know how in the field of electromagnetic compatibility These skills are put to good use in the development and construction of various kinds of equipment especially emc test equipment and fast electrical pulse generator 3 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com ae montena 1 1 Products
14. f a box containing 4 resistors of different values The specifications are the following Power Weight e o Dimensions cm 17 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com A mon tena 7 System monitoring The recommended test monitoring comprises current and voltage sensors an oscilloscope and a PC with its software for automatic control data acquisition and automatic report generation Current sensors Required are at least two current sensors one measuring the injected current and one for the residual current Residual voltage sensor In order to have a good measurement sensitivity two residual voltage sensors are recommended one 1000x voltage probe and one 100x voltage probe Optical link transmission For reliable measurement the transmission between the sensors and the control room has to be immune to the generated field A fibre optic link is recommended for each sensor The proposed optical transmission comprises 4 links e 2 x Acquisition Module 50 Ohm for current sensors e 1x Acquisition Module 1 MOhm for voltage sensors Digital Oscilloscope We recommend a digital oscilloscope with following characteristics e 4channels digital oscilloscope e 2 GHz bandwidth e 5Gs s 10 Gs s max lt has to be noticed that the oscilloscope has to be integrated in the control and measurement software 18 24
15. ling box Nominal voltage DC 400 Hz 230 V 230 V 230 V 230 V Nominal current DC 400 Hz 60 A 10 A 60 A 60 A Number of lines 4 4 2 2 Max pulse voltage 500 ns gt 80 kV gt 80 kV gt 80 kV gt 80 kV Max DC voltage gt 35 kVac gt 35 kVac Maximum peak current gt 5 kA gt 5 kA gt 5 kA gt 5 kA Signal cut off frequency 3 kHz 3 dB 3 kHz 3 dB Connector connecting bars connecting bars connecting bars connecting bars Weight 14 kg 17 kg 8 6 kg 14 5 kg Dimensions L x H x W 70 x 24 5 x 42 cm 56 x 24 5 x 50 cm 60 x 24 5 x 42 cm 56 x 24 5 x 50 cm 15 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com A mon tena 5 Isolating devices The purpose of these decoupling devices is to isolate the external load the mains the auxiliary equipment etc from the pulses injected by the generators Unfortunately using isolating devices is not always possible due to the fact that these devices can also block the signal if their frequency is in the same range than the pulse So we generally recommend to inject the pulses only on lines and connections which are not connected to active auxiliary equipment A Short pulse decoupling Due to the high voltage of the short p
16. njection test setup 1 3 Other MIL STD references Montena has developed and sold turnkey test setups for other MIL STD 461 test systems as RS 101 CS 101 CS 114 CS 115 and CS 116 n Figure 3 Combined fully automated CS114 CS115 CS116 test setup 6 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com A mon tena 2 PCI test system description Montena s EMP PCI test system is designed to perform Pulsed Current Injection PCI tests according MIL STD 188 125 1 8 2 PCI acceptance testing is used to demonstrate that electrical POE Point Of Entry protective devices as installed perform in accordance with the transient suppression attenuation requirements of this standard PCI verification testing confirms the transient suppression attenuation performance in operational circuit configurations and demonstrates that mission critical systems MCS are not damaged or upset by residual internal transient stresses The test setup comprises following elements Facility or System Under Test Cable Under Test POE Protective Device Residual Residual Isolation Coupling m Current U Voltage Devi A Devi Current YA evice evice Sansor Sensor Sensor Internal tae Fiber Optic Dummy Load y Transmitter Or Equipment Or Equipment Pulse Fiber
17. rcuit voltage lt 5 kV to 80 kV positive only Source impedance 2 60 ohm Peak short circuit current 80 A to gt 1 KA Current pulse rise time short circuit lt 20 ns Current pulse length short circuit 500 550 ns FWHM Charging time lt 1 min Output connectors connecting bar with different drilling diameters Insulation oll Interface RS 232 USB on the control unit Power rating 85 264 Vac 50 60 Hz 150 VA Storage working temperature 5 50 C 15 45 C Dimensions control unit generator 56 x 19 x 45 cm 92 x38x55 cm LxH xW Weight control unit generator 11 kg 80 kg with oil 9 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com ae montena 350 kV Short Pulse Generator This generator is built around a Marx generator delivering up to 350 kV in open circuit and more than 5 KA in short circuit It comprises the high voltage Marx unit and the control unit Specifications Type a E a Figure 6 Picture of an EMP300K 5 500 with its control unit EMP300K 5 500 Standard MIL STD 188 125 1 and 2 short pulse Type Marx peaking Peak erected voltage 100 to 350 kV positive only Peak short circuit current 1 kA to 5 kA Source impedance 2 60 ohm
18. seseeaseaecnseente 12 Pulse COUPIING SV CCS eksitan ik a a n l A n aj l e e ni a A po n 13 NB LUC TIME CE WEL rarer fiti fa oil eki dat ta ie jn an lk a e e a ka l n a a en e ek e e a e eee a 14 CAPACITIVE COUPLERS AND ISOLATION DEVICES ccccccccccccccccccccccccccacacacacacaeaeaeaeceaeauacaeaeaeaeaeauauauuseaeauseatsnenas 15 ISO IAUIING COV ICC S ssc ate kaa l diy ka ik e pk e n k n e lt n a e kt e ki a li 16 Termination TO B Si wiii tak na e a ak e n e n a e e e a e e kk a a a a e a a a n e A DR RE SO ik SR 17 SYSTEM MONINTO NNA t ii ay wy l pa ty et jal kn aj kk e a ra a n a a po a ll a pf ba e e tn 18 Control and data acquisition system ccceeeeeeeeeseeeeeeeenseeeeeeeesseeseoenseeeseeoenseeeseeoenseeeseooenes 19 DATA ACQUISITION SOF TWA PY tib t ki le a e at tn a aj asa at kane a a a a a ka a e n A a e nne 19 Shielded container 2 0c0ccccecececcecececcccscccececncnscsccencncnsesenencnscscsenencnscsenencnscsesenenensesesenensnsesenenensnss 21 El ctric POE protecliive Ce VIC CS srci pab kn kl ka il kaa n a n ka e a n a aaa kk kn a a a 23 MENVICES SU PP ONA ki ko ki ai kk kai aka ki a ak a l kk an kr a w ki kk a l n e l kk e e ai ais 24 MANUALS AND DOCUMENTATION kk kt kk tk kt ke kk ke ee ke a kaka ae eee eee aaa aaa eee aeeeeeeeaeeaeeeeeeeaseoeoeoeeoeoeoeoeoeaoeoaooaeaaaooaoaoannnn 24 ONSITE INSTALLATION AND TRAINING eke tt tett kt ke ke kaka ke ke ae ae ae ae ae ae ae aa aaa aaa ae ae ae eeaeeeeeeeeeoeoeoeeeo
19. ted to 4 independent wires even if those are carrying power or signals Following methods are then recommended e On shielded cables direct connection to the generator e On mains AC DC supply connections direct coupling to the pulse generator The mains source or the auxiliary test equipment must be powered through an isolating transformer in order to force the current of the pulse to flow in the protective device In this way the external load is isolated The intermediate pulse generator is equipped with 4 independent outputs which will allow the coupling on 4 lines The pulse will be injected on 1 wire to ground or 2 3 or 4 lines common mode e On signal data telecom cables 1 A 4 wires 60 Vac 1 A a direct coupling is carried out through the 4 outputs of the generator A transformer could also be used to isolate the connected equipment from the external world Summary we recommend to use direct coupling No specific coupling device is proposed Eventually a A 60 A 230 Va isolating transformer could be proposed as an option C Charge line pulser coupling The coupling of the charged line pulse is carried out by direct connection of the coaxial cable connection to test to the pulse generator No coupling device is proposed 13 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com p montena 4 1 Inductive coupler
20. to 264 V 50 60 Hz 1 6 kVA peak Storage working temperature 5 50 C 10 45 C Dimensions L x H x W 55 x 40 x 51 cm Weight 42 kg 11 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com lt montena 3 3 Charge line pulser This generator is based on a variable charge line In order to adjust the length of the charge line to the quarter wavelength of the applicable frequency special coaxial cables must be connected to the pulse generator A set of 9 cables are supplied with the generator to cover the frequency range of 30 to 300 MHz Specifications Type CLP40K Standard MIL STD 188 125 2 charge line Charging voltage 0 2 25 KV positive only Peak short circuit current 40 A to 400 A Provided lines electrical lengths 6 15 18 23 31 50 67 100 125 167 cm Source impedance 50 ohm Rise time of the current on 50 ohm lt 5ns Charging time lt 30 sec Charge line and output connectors HVM50K S montena proprietary Interface RS 232 USB Power rating 85 264 Vac 50 60 Hz 150 VA Storage working temperature 5 50 C 10 45 C Dimensions control unit HV unit 56x19x45cm 30 x 12 x20 cm LxHx W Weight control unit HV unit 15 3 2 kg 12 24 montena technology sa 1728 Rossens
21. ulse generator the decoupling requires capacitors and inductances of large dimensions In addition the rather high value of the decoupling components will exhibit a low pass filter behaviour not compatible with most of the ordinary data signals Other coupling isolating methods must be used in these cases We propose some isolating devices included in the capacitive coupling cabinet DS3 or DL3 See specifications in chapter 4 2 Capacitive couplers and isolation devices B Intermediate pulse decoupling Because the frequency content of the pulse is the range of some Hz to some kHz it is not possible to use isolating devices The signals and even the mains 50 60 Hz will be blocked by the decoupling devices Finally the size weight and price of these devices will be prohibitive C Charge line pulser decoupling Because the pulse is injected directly on the coaxial connection isolating devices are neither possible nor needed 16 24 montena technology sa 1728 Rossens Switzerland phone 41 26 411 84 84 fax 41 26 411 17 79 www montena com e mail products montena com A mon tena 6 Termination loads A set of 0 2 0 5 2 50 ohm termination loads are usually proposed as option These loads can be connected to the end of the tested lines inside or and outside the protected area to terminate the line and absorb the injected current pulse They are not applicable to the AC DC supply The termination loads consist o
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