Manual - ETS
Contents
1. 14 Model 91550 Series Current Probe eee nec 15 Model 91550 Series Physical Specifications 15 Model 91550 Series Electrical Specifications 15 Model 91550 Series Pulse Power Limits esessssuuuss 17 Model 93511 Series Current Probe eee aaa 18 Model 93511 Series Physical Specifications 18 Model 93511 Series Electrical Specifications 18 Model 93686 Series Current Probe eee eee aaa 19 Model 93686 Series Physical Specifications sssse 19 Model 93686 Series Electrical Specifications 20 Model 94106 Series Current Probe nenea 21 Model 94106 Series Physical Specifications sse 21 Model 94106 Series Electrical Specifications 21 Model 94106 Series Pulse Power Limits sssessesuuuss 22 Model 94111 Series Current Probe eee nea 23 Model 94111 Series Physical Specifications ssse 23 Model 94111 Series Electrical Specifications 23 Model 94111 Series Pulse Power Limits ssssssssuusss 24 Model 94430 Series Current Probe nene 25 Model2. 10 kHz 150 MHz E co 0M 10 kHz 200 MHz L Models 20 Hz Transfer Impedance 500 3 dB 1 0 0 2 dB 1 0 0 2 dB Nominal 1 MHz 100 MHz 1 MHz 150 MHz 1 MHz 100 MHz RF Current Range 42 amps 2 8 amps 2 3 RF Current Range 100 amps 100 amps 100 amps Maximum Power Current 350 amps 350 amps 350 amps DC 60 Hz Specifications 15 Maximum Power Current 400 Hz Maximum Power Voltage Rated Ouptut Load Impedance Sensitivity Under Rated Load 16 350 amps 50 Hz 1500 Hz 0 17 microampere with 1 microvolt sensitivity receiver and 6 ohm transfer impedance 1 0 microampere with 1 microvolt sensitivity receiver and 1 ohm transfer impedance or 10 mV across 50 ohm load for 0 01 amp signal Specifications 1 0 microampere with 1 microvolt sensitivity receiver and 1 ohm transfer impedance or 10 mV across 50 ohm load for 0 01 amp signal MoDeL 91550 SERIES PULSE POWER LIMITS RF Current Range Pulse 100 amps Pulse signals with 100 amps with peak currents to maximum pulse 100 amps can be duty cycle not to exceed 0 002 for 100 amp signal measured if the pulse duty cycle does not exceed e 10 amps Ip 0 080 Duty 30 amps Ip 0 010 Duty 50 amps Ip 0 003 Duty 100 amps Ip 0 001 Duty Maximum Power 2 MHz e 60 Hz NA Current 50 amps 650 amps L Models Only 1 MHz e 120 Hz 60 amps 650 amps 0 5 MHz e 400 Hz 85 amps 500 a
3. Equipment Setup to Measure RF Current cccccececsececeeeeeneeeeeeeaeeenees 37 For a Single Conductor rrrrnrnrnnnnnnnnnnrnrnnnernnrennnnnnnnnnnnnsrennnsnennnsnennn 37 Fora TWwo Gonducfor Cable i cra e 3 d alma d ba etes o ru e Sage deae 37 For Multi Conductor Cables eee 37 To Evaluate Shielding Effectiveness rrrrnrnnnnrrnnnnnvrnvnnnnvrnnnnrrrnnnnsnere 38 Installation ost HoTis 23 recusa duae at pia ia Ek deo ca ani ac EUR bul 38 sample Test Configlralloh sue mesa een ta eco p xD taa d 2 nobia d me made 39 6 0 Operation ii 050000 a cot da AC tic UD UTE 41 Signal Meastiremenit css saca e tion oa ea ta e n a i a tc TERES ip 42 SiO Mal La ee seaca scala doamna M Mc T LESER 45 AO Typical Data pere 47 Model 91197 Series Current Probe rrnrrarnnnnnnrrnnnnnnvnnnnnnrrnnnnnnernnnnnsrnnnnnnere 47 Model 91197 1 Transfer Impedance rrnnnnnnnnnnnnnnnvnnnnnnnnnnnnnnnnnnnnnnnnn 47 Model 91197 1L Transfer Impedance eee 47 Model 91550 Series Current Probe eee eee aaa 48 Model 91550 1 Transfer Impedance rrnnnnnnnnnnnnnnnvnnnnnnnnnnnnnnnrnnnnnnnnn 48 Model 91550 2 Transfer Impedance eee eee 48 Model 91550 5 Transfer Impedance eee eee eee eee 49 Model 93511 Series Current Probe eee eee aaa 50 Model 93511 1 Transfer Impedance c eee eee 50 Model 93511 1L Transfer Impedance rrrrnnnnnnnnnrnnnnnnnnnnnnnnnn
4. 94430 Series Physical Specifications ss 25 Model 94430 Series Electrical Specifications 25 Model 94430 Series Pulse Power Limits esessesuuuss 26 Model 94606 Series Current Probe m eee aaa 27 Model 94606 Series Physical Specifications ss 27 Model 94606 Series Electrical Specifications 27 4 0 Principles of Operation 29 LEX reis ET 29 Basic RE Trensiommen uaa iode e cuni de dos RU DE Rd 30 Ss M 31 Model 91197 Series Typical Sensitivity eee 31 Model 91550 Series Typical Sensitivity m eee 31 Model 93511 Series Typical Sensitivity m eee 32 Model 93686 Series Typical Sensitivity seeeesseeessssse 32 Model 94106 Series Typical Sensitivity eee 32 Model 94111 Series Typical Sensitivity sseesessssssssse 33 Model 94430 Series Typical Sensitivity seeessssssssssse 33 Model 94606 Series Typical Sensitivity sseeesesseessssse 33 Core Saturation and Intermodulation rarrrrvrnnrrrrrrnnerrrrrnnerrrrrnnerernnnereennnn 34 Transfer IMPSGANGCE aent 34 5 0 Assembly and Installation 37
5. Series 5 0 inches gt For greatest accuracy the conductor under measurement should be centered in the window of the current probe Place the probe around the conductor s to be measured and then carefully lock the probe jaws Otherwise inadequate shielding or incorrect air gap will result and the measurement will not be accurate The connecting cable used between the current probe and the EMI test equipment must have 50 ohm characteristic impedance and matching cable connectors The current probe is calibrated for use only with a 50 ohm load Therefore the EMI test equipment must have a 50 ohm input impedance Observe precautions regarding minimum bending radius when installing and using the cable For long cables and at high frequencies cable loss may also be a factor Use low loss cables and perform cable loss corrections if necessary 38 Assembly and Installation The probe rejection of any external pickup from conductors not passing through the window is better than 60 dB The presence of very strong magnetic fields will likely have an effect on probe sensitivity Do not place the unit close to permanent magnets or the magnetic field structures of motors or generators Sample Test Configuration LISN EUT MEASUREMENT RECEIVER DATA RECORDER Assembly and Installation 39 This page intentionally left blank 40 Assembly and Installation 6 0 Operation CAUTION Before connecting any components follow th
6. The load resistor must also be protected from excessive line currents The influence of intermodulation on the current probe output as measured with the EMI test equipment is negligible for primary conductor power frequency currents under 300 amperes For primary power currents above 300 amperes measurements taken by the EMI test equipment generally will not be affected by intermodulation due to the averaging characteristics for the quasi peak and peak functions the readings will increase with current Transfer Impedance The RF current Ip in microamps in the conductor under test is determined from the reading of the current probe output in microvolts Es divided by the current probe transfer impedance Z1 Ip ES di Or in dB Ip dBuA Es dBuV Zr dB 34 Principles of Operation The typical transfer impedance of the current probe throughout the frequency range is shown in Typical Data on page 47 It is determined by passing a known RF current Ip through the primary test conductor and noting the voltage Es developed across a 50 ohm load y Principles of Operation 35 This page intentionally left blank 36 Principles of Operation 5 0 Assembly and Installation CAUTION Before connecting any components follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment Equipment Setup to Measure RF Current gt Standing waves can exist on the test conductor
7. conducted CW signal in terms of microamperes in the test sample lead Example Frequency is 3 0 kHz step 1 measurement is 150 microvolts For example suppose the transfer impedance of the current probe was 0 34 ohms Then as outlined in step 2 150 0 34 441 1 microamperes in the test sample lead IN TERMS OF MICROAMPERE PER MEGAHERTZ IN TEST SAMPLE LEAD BROADBAND INTERFERENCE MEASUREMENT 1 Adjust the EMI test equipment for standard gain and make a measurement of the broadband interference voltage output from current probe in terms of microvolts per megahertz at meter input Use procedures outlined in the EMI test equipment instruction manual 2 Divide the microvolt per megahertz measurement of the previous step by the transfer impedance in ohms at the test frequency The result is the value of conducted broadband interference in terms of microamps per megahertz in the test sample lead Example Frequency is 10 0 kHz step 1 measurement is 8000 microvolts per megahertz For example suppose the transfer impedance of the current probe was 0 39 ohms Then as outlined in step 2 8000 0 39 20513 microamps per megahertz in test sample lead 44 Operation Signal Injection gt Applies to Model 94111 Series only Current probes may be used to inject RF currents into test conductors when performing susceptibility tests Injection is best accomplished with current probes that do not have internal loading Internal loadin
8. conductor or cable in which current is to be measured the conductor forms the primary winding The clamp on feature of this probe enables easy placement around any conductor or cable Circuit The circuit is that of a radio frequency transformer as illustrated on page 30 Because the current probe is intended for clamp on operation the primary shown on page 30 is the electrical conductor in which interference currents are to be measured This primary is considered as one turn since it is assumed that the noise currents flow through the conductor and return to the source by way of a ground conductor such as a frame common ground plane or earth On some current probe models the secondary output terminals are resistively loaded internally to provide substantially constant transfer impedance over a wide frequency range Principles of Operation 29 Basic RF TRANSFORMER 13Uu81Jn 5 asion Qu Bulpul M l1epuo238 eouepedu suuo OG sjgeg erxe09 or 1ndijn o a d ri ag m Fi pea ydwesssp Ae ull g B eased plays 21 5 01 2 81 3 Principles of Operation 30 Sensitivity Probe sensitivity in microamperes depends on the sensitivity in microvolts of the receiving equipment with which it is used The following tables show the relationship of receiving sensitivity in microvolts to the overall sensitivity of the probe and receiver in microamperes This data is based on the transfer impedance of ea
9. 1550 2 TRANSFER IMPEDANCE dB Ohm 40 01 1 1 0 10 100 200 Frequency MHz 48 Typical Data MODEL 91550 5 TRANSFER IMPEDANCE 20 dB Ohm 20 30 01 E 1 Frequency MHz Typical Data 100 200 49 Model 93511 Series Current Probe MoDeL 93511 1 TRANSFER IMPEDANCE dB Ohm 20 20 30 40 50 1 0 100 Frequency MHz MonEL 93511 1L TRANSFER IMPEDANCE dB Ohm 50 20 30 40 50 100 500 1k 2k 10k 20k 50k 100k Frequency MHz 50 200 Typical Data Model 93686 Series Current Probe MODEL 93686 1 TRANSFER IMPEDANCE 30 01 1 1 0 10 100 Frequency MHz MODEL 93686 8 TRANSFER IMPEDANCE dB Ohm 30 01 1 1 0 10 100 500 Frequency MHz Typical Data 51 Model 94106 Series Current Probe MonEL 94106 1 TRANSFER IMPEDANCE 40 dB Ohm J 1 10 100 1000 Frequency MHz 52 Typical Data Model 94111 Series Current Probe MonEL 94111 1 TRANSFER IMPEDANCE dB Ohm 40 35 30 25 20 15 10 1 10 100 1000 Frequency MHz MoDEL 94111 2 TRANSFER IMPEDANCE dB Ohm 40 1 10 100 1000 Frequency MHz Typical Data 53 Model 94430 Series Current Probe MoDEL 94430 1 TRANSFER IMPEDANCE 30 01 A 1 0 10 100 500 Frequency MHz 54 Typical Data Model 94606 Series Current Probe MoDeL 94606 1 TRANSFER IMPEDANCE Response dB 1x10 10 40 Frequency MHz Typical Data 10 55 This page inten
10. Current Probes User Manual SWETS LINDGREN An ESCO Technologies Company ETS Lindgren L P reserves the right to make changes to any product described herein in order to improve function design or for any other reason Nothing contained herein shall constitute ETS Lindgren L P assuming any liability whatsoever arising out of the application or use of any product or circuit described herein ETS Lindgren L P does not convey any license under its patent rights or the rights of others O Copyright 2008 by ETS Lindgren L P All Rights Reserved No part of this document may be copied by any means without written permission from ETS Lindgren L P Trademarks used in this document The ETS Lindgren logo is a trademark of ETS Lindgren L P Revision Record MANUAL DESCRIPTION Part 4399297 Rev A Revsion Dep owe Initial Release December 2008 Table of Contents Notes Cautions and Warnings vii TO a pi goe bec i Le p meos LR 9 ETS Lindgren Product Information Bulletin rrnrrrnrnnrrrrrrnnrrrrnrnnrrrrnnnnnnre 10 2 0 Maintenance 11 Annual GalibretiOb svarer 11 Service PrOGedULeS scana aria sad iale atei aaa sa da a iat ae o FR ida i pda ati desta Kei Son ue pEES 11 3 0 SpecnNcanonsavvavv4vv varde 13 Model 91197 Series Current Probe eee eee 13 Model 91197 Series Physical Specifications eee 13 Model 91197 Series Electrical Specifications
11. DEL 94106 SERIES PULSE POWER LIMITS 94106 1 94106 1L RF Current Range Pulse Maximum Power DC to 60 Hz 300 amps Current L Models Only DC to 120 Hz 300 amps DC to 400 Hz 300 amps DC to 1500 Hz 300 amps When both signal and power currents are high their sum should not exceed the given limits 22 Specifications Model 94111 Series Current Probe MODEL 94111 SERIES PHYSICAL SPECIFICATIONS Window Diameter 3 18 cm 1 25 in Outside Diameter 8 89 cm 3 5 in 3 56 cm 1 4 in Output Connector Type N 0 42 kg 15 oz MODEL 94111 SERIES ELECTRICAL SPECIFICATIONS 94111 1 94111 1L 94111 2 F requency Range 14 H2 1000 MHz 1 MHz 1000 MHz L Models 20 HZ Transfer e 0 90 1dB Q 3dB Impedance 91 MHz Nominal 2 50 8dB Q 3dB 910 MHz 10 0dB Q 3dB 5Q 14dB Q 3dB 01 MHz 100 MHz 0100 MHz 5 60 15dB 0 3dB 9500 MHz RF Current Range RF CW RF Current Range 200 amps Pulse i Specifications 23 Maximum Power Current 200 amps 200 amps DC 400 Hz Maximum Power No limitation subject to adequate Voltage conductor insulation Sensitivity Under 0 2 microampere with 1 microampere with Rated Load 1 microvolt sensitivity 1 microvolt sensitivity receiver and 5 ohms receiver and 1 ohm transfer impedance transfer impedance MoDeL 94111 SERIES PULSE POWER LIMITS RF Current Range Pulse signals with peak Pulse currents to 200 amps can be measured if
12. be MODEL 91197 SERIES PHYSICAL SPECIFICATIONS Window Diameter Outside Diameter Output Connector Type N Weight 0 6 kg 11b 5 oz Impedance Specifications 13 MODEL 91197 SERIES ELECTRICAL SPECIFICATIONS 91197 1 Frequency Range L Models 20 Hz 10 kHz 8 MHz 0 32 Q 2 dB 10 kHz 1 MHz Transfer Impedance Nominal RF Current Range RF CW 100 amps RF Current Range Pulse 100 amps 200 amps with reduced duty cycle Maximum Power Current DC 400 Hz 350 amps Maximum Power 91197 1L 20 kHz 8 MHz 0 320 2 dB 1 kHz 1 MHz 220 kHz 150 amps max 10 kHz 166 amps max 4 kHz 200 amps max 2 kHz 250 amps max 1 kHz 400 amps max 400 Hz 1000 amps ma Below 400 Hz the probe is limited by core saturation effects at an Ip of 1000 amps 100 amps 200 amps with reduced duty cycle 1000 amps No limitation subject to adequate conductor insulation Voltage Sensitivity Under 30 microamperes with Rated Load 1 microvolt sensitivity receiver and 0 33 ohm transfer impedance 14 Specifications 30 microamperes with 1 microvolt sensitivity receiver and 0 33 ohm transfer impedance Model 91550 Series Current Probe MODEL 91550 SERIES PHYSICAL SPECIFICATIONS Window Diameter 3 18 cm 1 25 in Outside Diameter 8 89 cm 3 5 in 7 29 cm 2 87 in Output Connector Type N 0 6 kg 1 31 Ib MODEL 91550 SERIES ELECTRICAL SPECIFICATIONS
13. ce 2 0 Q 2 dB 8 00 3 dB Nominal 100 kHz 10 MHz 10 MHz 200 MHz RF Current Range RF CW 0 amps 200 amps 0 amps 62 amps RF Current Range 200 amps 62 amps Pulse p j Maximum Power Current 350 amps 300 amps DC 60 Hz Maximum Power Current 350 amps 300 amps 400 Hz Maximum Power No limitation subject to adequate conductor insulation Voltage Sensitivity Under 0 5 microampere with 0 125 microampere with Rated Load 1 microvolt sensitivity 1 microvolt sensitivity receiver and 2 ohm receiver and 8 ohm transfer impedance transfer impedance 20 Specifications Model 94106 Series Current Probe MoDEL 94106 SERIES PHYSICAL SPECIFICATIONS Window Diameter 3 18 cm 1 25 in Outside Diameter 8 26 cm 3 25 in 3 56 cm 1 4 in Output Connector Type N 0 43 kg 15 oz MoDEL 94106 SERIES ELECTRICAL SPECIFICATIONS 94106 1 Frequency Range 100 kHz 450 MHz Transfer Impedance 2 Q 6 db 3 dB 1 MHz Nominal e 6Q 15 5 db 3 dB 100 MHz 450 MHz RF Current Range g 20 amps RF CW RF Current Range g 50 amps Pulse Maximum Power Current 200 amps DC 60 Hz Specifications 21 94106 1 Maximum Power Current 200 amps 400 Hz Maximum Power No limitation subject to adequate conductor insulation Voltage Rated Output Load Impedance Sensitivity Under 0 1 microampere with 1 microvolt sensitivity receiver Rated Load and 10 ohm transfer impedance MO
14. ch model MODEL 91197 SERIES TYPICAL SENSITIVITY Test Equipment Sensitivity 91197 1 in Microvolts MODEL 91550 SERIES TYPICAL SENSITIVITY Test Equipment 91550 1 91550 2 91550 5 Sensitivity in Microvolts Principles of Operation 31 MODEL 93511 SERIES TYPICAL SENSITIVITY Test Equipment Sensitivity 93511 1 in Microvolts MoDeL 93686 SERIES TYPICAL SENSITIVITY Test Equipment Sensitivity in Microvolts 93686 1 93686 8 MODEL 94106 SERIES TYPICAL SENSITIVITY Test Equipment Sensitivity 94106 1 in Microvolts 32 Principles of Operation MODEL 94111 SERIES TYPICAL SENSITIVITY Test Equipment Sensitivity in Microvolts 94111 1 94111 2 MODEL 94430 SERIES TYPICAL SENSITIVITY Test Equipment Sensitivity 94430 1 in Microvolts MODEL 94606 SERIES TYPICAL SENSITIVITY Test Equipment Sensitivity in Microvolts 94606 1 94606 6 Principles of Operation 33 Core Saturation and Intermodulation The magnetizing effects of a primary conductor carrying large currents at power line frequencies can saturate the current probe core material Core saturation produces non linear transforming action and can result in e A decrease in the current probe RF output for a given RF current input Modulation of the RF output by the power line frequency CAUTION The specified pulse duty cycle should not be exceeded or the current probe internal load resistor if applicable may be subject to damage
15. e safety information in the ETS Lindgren Product Information Bulletin included with your shipment If measuring uninsulated conductors Use extreme care when installing the current probe and taking measurements If possible de energize the test sample during assembly and disassembly of the setup Also arrange to center the test conductor in the current probe window for additional voltage breakdown protection Do not permit the uninsulated current probe connector and cable connectors to come in contact with the ground plane or other nearby conductors This will prevent possible measurement error due to ground loops and will avoid danger from high voltages Ensure that the 50 ohm load is capable of safely dissipating the incurred power Should the load become disconnected the developed voltage will be come much greater and may be very dangerous The RF current probe is a broadband RF transformer for use with EMI test equipment Radio frequency currents can be measured in cables without physically disturbing the circuit Operation 41 Signal Measurement OSCILLOSCOPE USE IN TERMS OF RF AMPERES 1 Standardize the gain of the oscilloscope to correctly read the voltage Es applied to the input terminals 2 Divide Es in volts by the average current probe transfer impedance ZT in ohms The result is the value of the RF signal in terms of amperes in the test conductor Example Assume an oscilloscope peak voltage measure
16. g will absorb part or most of the driving power and can seriously limit the maximum levels of voltage and current that the current probe can handle as an injection device The current probe does not have an internal load and therefore is suited for signal injection However it will be limited by connector voltage rating 500 V and by the thermal limit of the coil windings A maximum continuous injection current into the current probe coils of 4 2 amps may be used two or three times this level may be used for short periods of time When injecting pulse signals the average current should be held within the above limits and the peak voltage held below 500 V Because of variable circuit impedances there is no easy way to compute the RF current that may be injected into the test conductor The practical way to determine the injected current is to measure it with a second current probe on the test conductor The second current probe can be any model that covers the frequency range of interest Operation 45 This page intentionally left blank 46 Operation 7 0 Typical Data Model 91197 Series Current Probe MODEL 91197 1 TRANSFER IMPEDANCE 20 dB Ohm 14 Frequency MHz MonEL 91197 1L TRANSFER IMPEDANCE 0 dB Ohm 01 4 1 0 10 100 1000 Frequency kHz Typical Data Model 91550 Series Current Probe MonEL 91550 1 TRANSFER IMPEDANCE 30 20 dB Ohm 20 01 1 1 0 10 0 100 Frequency MHz MODEL 9
17. ment of 5 volts and the average Zr to be 1 06 ohms Then 5 1 06 4 71 amperes in the test conductor The example is valid providing that the oscilloscope rise time T 0 3 BW is shorter than RF signal pulse duration This also applies to the current probe which has a rise time of about 3 nanoseconds based on a 100 megahertz bandwidth IN TERMS OF dB ABOVE ONE MICROAMPERE AT METER INPUT CW CONDUCTED MEASUREMENTS 1 Adjust the EMI test equipment for standard gain and make a measurement of the CW signal voltage output from the current probe in terms of dB above one microvolt Use procedures outlined in the EMI test equipment instruction manual 2 Subtract the transfer impedance of the current probe in dB at the test frequency from the dB measurement of the previous step The result is the value of the conducted CW signal in terms of dB above one microamp at meter input gt At meter input as used in the MIL I 26600 and MIL 1 6181D specifications refers to the current in the test sample lead 42 Operation Example Frequency is 10 0 kHz step 1 measurement is 52 dB above one microvolt For example suppose the transfer impedance of the current probe used in the example was 8 0 dB below one ohm at 10 0 kHz Then as outlined in step 2 52 dB 8 0 dB 60 dB above one microampere at meter input IN TERMS OF dB ABOVE ONE MICROAMPERE PER MEGAHERTZ AT METER INPUT BROADBAND INTERFERENCE MEASUREMENT 1 Adjust the EMI test eq
18. mps 0 2 MHz e 1500 Hz 175 amps 140 amps 0 1 MHz 340 amps 0 05 MHz 650 amps Specifications 17 Model 93511 Series Current Probe MODEL 93511 SERIES PHYSICAL SPECIFICATIONS Window Diameter 3 18 cm 1 25 in Outside Diameter 8 26 cm 3 25 in 3 56 cm 1 4 in Output Connector Type N 0 6 kg 11b 5 oz MODEL 93511 SERIES ELECTRICAL SPECIFICATIONS 93511 1L Frequency Range 10 kHz 30 MHz 20 kHz 30 MHz L Models 20 Hz Transfer Impedance 1 0 db 2 dB 1 Q 0 db 2 dB Nominal 100 kHz 10 MHz 100 kHz 10 MHz RF Current Range g 100 amps 100 amps RF CW RF Current Range i g 200 amps 200 amps Pulse Maximum Power Current 350 amps 800 amps DC 60 Hz 18 Specifications Maximum Power Current 350 amps 800 amps 400 Hz Maximum Power No limitation subject to adequate conductor insulation Voltage Sensitivity Under 1 0 microampere with 1 0 microampere with Rated Load 1 microvolt sensitivity 1 microvolt sensitivity receiver and 1 ohm receiver and 1 ohm transfer impedance transfer impedance Model 93686 Series Current Probe MODEL 93686 SERIES PHYSICAL SPECIFICATIONS Window Diameter 6 65 cm 2 62 in Outside Diameter 13 97 cm 5 5 in Output Connector Type N 2 27 kg 5 Ib Specifications 19 MoDEL 93686 SERIES ELECTRICAL SPECIFICATIONS 93686 1 93686 8 F R requeney sang 10 kHz 30 MHz 10 kHz 200 MHz L Models 20 Hz Transfer Impedan
19. n Current Probe is a clamp on RF current transformer that determines the intensity of RF current present in an electrical conductor or group of conductors The current probe is designed for use with electromagnetic interference EMI test receivers or spectrum analyzers or with any similar instrument having a 50 ohm input impedance 3 18 cm 8 26 cm Model 93511 Series Current Probe A current probe provides a way to accurately measure net common mode radio frequency current flowing on a wire or bundle of wires without requiring a direct connection to the conductor s of interest The probe clamps around the test conductor which becomes a one turn primary winding the probe forms the core and secondary winding of an RF transformer Measurements can be made on single conductor and multi conductor cables grounding and bonding straps outer conductors of shielding conduits and coaxial cables and so on Introduction 9 This manual includes these ETS Lindgren current probes Model 91197 Series e 91197 1 e 91197 1L Model 93686 Series e 93686 1 e 93686 8 e 93686 8L Model 94430 Series e 94430 1 e 94430 1L Model 91550 Series e 91550 1 e 91550 1L e 91550 2 e 91550 2L e 91550 5 Model 94106 Series e 94106 1 e 94106 1L Model 94606 Series e 94606 1 e 94606 1L e 94606 6 Model 93511 Series e 93511 1 e 93511 1L Model 94111 Series e 94111 1 e 94111 1L e 94111 2 ETS Lindgren Pr
20. nnnnnnnnnn 50 Model 93686 Series Current Probe near 51 Model 93686 1 Transfer Impedance eee 51 Model 93686 8 Transfer Impedance eee 51 Model 94106 Series Current Probe eee 52 Model 94106 1 Transfer Impedance rrnnnrnnnnnnnnnnnvnnnnnnnnnnnnnnnnnnnnnnnnn 52 Model 94111 Series Current Probe eee aaa 53 Model 94111 1 Transfer Impedance eee 53 Model 94111 2 Transfer Impedance eee 53 Model 94430 Series Current Probe nare 54 Model 94430 1 Transfer Impedance eee eee 54 Model 94606 Series Current Probe nene 55 Model 94606 1 Transfer Impedance eee 55 Appendbc A Warranty scoateti soe bate ia nue bla dac mo alin media dete 57 This page intentionally left blank vi Notes Cautions and Warnings Note Denotes helpful information intended to provide tips for better use of the product Caution Denotes a hazard Failure to follow CAUTION Me M instructions could result in minor personal injury and or property damage Included text gives proper procedures Warning Denotes a hazard Failure to follow instructions could result in SEVERE personal injury and or property damage Included text gives proper procedures See the ETS Lindgren Product Information Bulletin for safety regulatory and other product marking information vii This page intentionally left blank viii 1 0 Introduction The ETS Lindgre
21. oduct Information Bulletin See the ETS Lindgren Product Information Bulletin included with your shipment for the following Warranty information e Safety regulatory and other product marking information Steps to receive your shipment e Steps to return a component for service ETS Lindgren calibration service ETS Lindgren contact information 10 Introduction 2 0 Maintenance CAUTION Before performing any maintenance follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment Maintenance is limited to external components such as cables or connectors WARRANTY If you have any questions concerning maintenance contact ETS Lindgren Customer Service Annual Calibration See the Product Information Bulletin included with your shipment for information on ETS Lindgren calibration services Service Procedures For the steps to return a system or system component to ETS Lindgren for service see the Product Information Bulletin included with your shipment Maintenance 11 This page intentionally left blank 12 Maintenance 3 0 Specifications gt At the lower frequencies the signal current Ip level can be as great as allowed for maximum power current When both signal and power currents are high their sum should not exceed the given limits gt L model current probes are calibrated down to 20 Hz Model 91197 Series Current Pro
22. p 0 39 Duty 50 amps Ip 0 3125 Duty 70 amps Ip 0 227 Duty Maximum Power Current DC to 1500 Hz 400 amps L Models Only 26 Specifications Model 94606 Series Current Probe MODEL 94606 SERIES PHYSICAL SPECIFICATIONS Window Diameter 12 7 cm 5 0 in Outside Diameter 19 81 cm 7 8 in 5 38 cm 2 12 in Output Connector Type N 3 18 kg 7 0 Ib MODEL 94606 SERIES ELECTRICAL SPECIFICATIONS 94606 1 94606 6 Frequency Range 10 kHz 100 MHz 1 kHz 5 MHz Transfer 5 Q 4dB 1 Q 2dB Impedance 1 MHz 100 MHz 910 kHz 5 MHz Nominal RF Current Range RF CW 3e 0 amps 100 amps 0 amps 300 amps RF Current Range 0 amps 100 amps 0 amps 400 amps Pulse Maximum Power pen 350 amps 350 amps DC 60 Hz 400 Hz Specifications 27 Maximum Power Voltage Rated Output Load Impedance Sensitivity Under Rated Load 28 94606 1 No limitation subject to adequate conductor insulation 0 2 microampere with 1 microampere with 1 microvolt sensitivity 1 microvolt sensitivity receiver and 5 ohms receiver and 1 ohm transfer impedance transfer impedance Specifications 4 0 Principles of Operation CAUTION PENE connecting any components or operating the probe follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment The current probe is an inserted primary type of radio frequency current transformer When the probe is clamped over the
23. the pulse duty cycle does not exceed e 10 amps Ip 0 06 Duty 50 amps for duty cycle less than 0 4 e 50 amps Ip 0 0024 Duty e 100 amps Ip 0 0006 Duty e 200 amps Ip 0 00015 Duty Maximum Power DC to 1500 Hz 300 amps Current When both signal and L Models Only power currents are high NA their sum should not exceed the given limits 24 Specifications Model 94430 Series Current Probe MoDEL 94430 SERIES PHYSICAL SPECIFICATIONS Window Diameter 1 91 cm 0 75 in Outside Diameter 5 72 cm 2 25 in 2 54 cm 1 0 in Output Connector Type BNC 0 18 kg 6 5 oz MODEL 94430 SERIES ELECTRICAL SPECIFICATIONS 94430 1 94430 1L F B OO 10 KHz 250 MHz L Models 20 Hz Transfer Impedance 60 2 dB 9 10 MHz 250 MHz Nominal 30 2d BQ 1 MHz 0 6 O 3 dB Q 100 kHz 0 10 3 dB 10 kHz RF Current Range 16 amps RF CW RF Current Range 70 amps Pulse Maximum Power Current 200 amps DC 400 Hz Specifications 25 94430 1 94430 1L Maximum Power Voltage No limitation subject to adequate conductor insulation Sensitivity Under 0 125 microampere with 1 microvolt sensitivity receiver Rated Load and 8 ohm transfer impedance MoDeL 94430 SERIES PULSE POWER LIMITS 94430 1 94430 1L RF Current Range Pulse signals with peak currents to 70 amps can be Pulse measured if the pulse duty cycle does not exceed 16 amps Ip 1 0 Duty 25 amps Ip 0 625 Duty 40 amps I
24. tionally left blank 56 Typical Data Appendix A Warranty See the Product Information Bulletin included with your shipment for the complete ETS Lindgren warranty DURATION OF WARRANTIES All product warranties except the warranty of title and all remedies for warranty failures are limited to two years Model 91197 Series Current Probe Model 91550 Series Current Probe Model 93511 Series Current Probe Model 93686 Series Current Probe Model 94106 Series Current Probe 2 Years Model 94430 Series Current Probe Model 94606 Series Current Probe Warranty 57
25. uipment for standard gain and make a peak measurement of the broadband interference voltage output from the current probe in terms of dB above one microvolt per megahertz Use procedures outlined in the EMI test equipment instruction manual 2 Subtract the transfer impedance of the current probe in dB at the test frequency from the dB measurement of the previous step The result is the value of the broadband interference in terms of dB above one microamp per megahertz at meter input gt At meter input as used in the MIL I 26600 and MIL 1 6181D specifications refers to the current in the test sample lead Example Frequency is 100 kHz step 1 measurement is 41 dB above one microvolt per megahertz For example suppose the transfer impedance of the current probe was 8 0 dB below one ohm at 100 kHz Then as outlined in step 2 41 dB 8 0 dB 49 dB above one microamp per megahertz at meter input This result is beyond the limit of 46 2 dB above one microamp per megahertz Operation 43 IN TERMS OF MICROAMPERE IN TEST SAMPLE LEAD CW CONDUCTED MEASUREMENTS 1 Adjust the EMI test equipment for standard gain and make a measurement of the CW signal voltage output from current probe in terms of microvolts at meter input Use procedures outlined in the EMI test equipment instruction manual 2 Divide the microvolt measurement of the previous step by the transfer impedance in ohms at the test frequency The result is the value of
26. under test at or near the resonant frequency Under these conditions several measurements taken along the line will provide a complete picture of the RF current distribution and amplitude FOR A SINGLE CONDUCTOR 1 Place the probe jaws around the conductor so that the conductor passes through the center opening 2 Lock the jaws together FOR A TWO CONDUCTOR CABLE e To evaluate the common mode component of the noise current the net effect of the currents leaving and returning Place the probe over both conductors at the same time e To measure the interference current in either conductor separately Place the probe over each wire individually FOR MULTI CONDUCTOR CABLES The probe will measure the net external effects of all the currents in the conductors that pass through the center of the probe Assembly and Installation 37 To EVALUATE SHIELDING EFFECTIVENESS When placed over shielding conduit coaxial cable or ignition shielding the probe measures the current flowing on the external surface of the shield Installation Instructions gt The window aperture of the probe will accommodate cables up to the following maximum outside diameters Current Probe Maximum Outside Diameter Model 91197 Series 1 25 inches Model 91550 Series 1 25 inches Model 93511 Series 1 25 inches Model 94106 Series 1 25 inches Model 94111 Series 1 25 inches Model 94430 Series 0 75 inches Model 93686 Series 2 62 inches Model 94606
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