Agilent N2893A 100 MHz Current Probe User's Guide
Contents
1. note the external markings on the instrument that are described under Safety Sym bols Warnings Before turning on the instru ment you must connect the protective earth terminal of the instrument to the protective conductor of the mains power cord The mains plug shall only be inserted in a socket outlet provided with a protective earth contact You must not negate the protective action by using an extension cord power cable without a protective conductor grounding Grounding one conductor of a two conductor outlet is not sufficient protection Only fuses with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuse holders To do so could cause a shock or fire hazard f you energize this instru ment by an auto transformer for voltage reduction or mains isolation the common termi nal must be connected to the earth terminal of the power source Whenever it is likely that the ground protection is impaired you must make the instrument inoperative and secure it against any unintended opera tion Service instructions are for trained service personnel To avoid dangerous electric shock do not perform any ser vice unless qualified to do so Do not attempt internal ser vice or adjustment unless another person capable of ren dering first aid and resuscita tion is present Do not instal2. 4 Set the Infiniium setups as follows Averaging 16 Time 5 ms div Vertical axis 5 A div Trigger level 0 mV Trigger slope Rise Measurement mode Vrms Voltage Measurement Area Entire Display RMS Type AC Other setups APPROPRIATE 5 Set the Generator setups to AC 10 Arms 50 Hz and sine wave 6 Generate the wave measure the current and record it 7 Remove the wire and the generator from the N2893A 20 AC current generator Infinitum or Infini1 Vision with IMQ input Current Probe 1147A Current loop wire Calibration Test Record Agilent Technologies N2893A DC to 100 MHz Current Probe Recommended Test Interval 1 year Serial No Certification Date Tested By Certification Temperature Recommended Date of Next Certification Test Limit Limit Minimum Maximum 1 AC Accuracy Arms 955 10 25 The AC Accuracy range is based on the Infiniium oscilloscope s accuracy Calculate the minimum and the maximum limits corresponding to the accuracy of your Infiniium oscilloscope 21 22 Safety Notices This apparatus has been designed and tested in accor dance with IEC Publication 1010 Safety Requirements for Measuring Apparatus and has been supplied in a safe condi tion This is a Safety Class instrument provided with ter minal for protective earthing Before applying power verify that the correct safety precau tions are taken see the follow ing warnings In addition
3. Agilent representative This unit is not constructed to be waterproof or dustproof so do not use it in a very dusty environment or in one where it will get wet The sensor head is a precision assembly including a molded component a ferrite core and a Hall effect element It may be damaged if subjected to sudden changes in ambient temperature or mechanical strain or shock and therefore great care should be exercised in handling it The matching surfaces of the sensor head are precision ground and should be treated with care If these surfaces are scratched performance may be impaired Do not bend or pull the sensor cable and power supply cable in order to avoid damaging the sensor cables Gently wipe dirt from the surface of the unit with a soft cloth moistened with a small amount of water or mild detergent Do not try to clean the unit using cleaners containing organic solvents such as benzine alcohol acetone ether ketones thinners or gasoline They may cause discoloration or damage To avoid scratching the surfaces of the Hall effect elements keep the core section of the sensor closed except when clamping it around the conductor to be measured Accurate measurement may be impossible in locations subject to strong external magnetic fields such as transformers and high current conductors or in locations subject to strong external electric fields such as radio transmission equipment Description of Parts Current di
4. Agilent N2893A 100 MHz Current Probe User s Guide Publication number N2893 97001 March 2012 For Safety information Regulatory information and publishing information see the pages at the end of this book Copyright Agilent Technologies 2011 2012 All Rights Reserved ES Agilent Technologies N2893A 100 MHz Current Probe Introduction The N2893A is a wide band DC to 100 MHz active current probe The probe features low noise and low circuit insertion loss It also features the AutoProbe interface which makes current measurements as simple as those made with active voltage probes The N2893A has two operating regions that provide a wide flat frequency response In the DC to low frequency AC region the probe operation is based on the negative feedback of the amplifier system that includes the thin film Hall element as a detector In the high frequency region the probe operates as a current transformer The N2893A is ideal for acquiring high transient time signals such as those found in Motor Controllers in Switching Power Supplies and in Current Amplifiers driving inductive loads In order to use this product effectively and to ensure a long operational life read this User s Guide carefully and retain it for future reference Features e Highly accurate current detection e Split core construction allows easy circuit connection Broadband frequency characteristics DC to 100 MHz e Connects directly to Infini
5. Mechanical Characteristics Maximum cable diameter 5 mm 0 2 inch Sensor cable length 1 5 m 59 inches Power cable length 1 m 39 inches Dimensions Sensor 175 mm x 18 mm x 40 mm 6 89 in x 0 71 in x 1 6 in Terminator 28 mm x 81 mm x 24 mm 1 1 in x 3 2 in x 0 94 in Weight 210 g 7 4 oz Accessories supplied storage case calibration certificate Environmental Characteristics See note 3 below Operating temperature range 0 C to 40 C 32 F to 104 F Storage temperature range 10 C to 50 C 14 F to 122 F Maximum relative humidity 80 no condensation operating or storage Vibration 10 to 55 Hz 30 min axis 10 octave min Amplitude 0 3 mm 55 Hz 30 min axis Amplitude 0 3 mm Acceleration 17 91 m s Maximum Altitude 2000 m 3 This probe is intended for indoor use only 10 EE DIOE EE I nA a N EEUU A 100 10k 100M Frequency Hz Amplitude dB Frequency response of N2893A Maximum input current Arms HIM 11 1111 DT 10 100 1k 10k 100k 1M 10M 100M Frequency Hz Continuous maximum input rating of N2893A 11 108m 10m gt Tue UNE DIEM DUE IIBER Lip Teer CON CON CO CON TA in ERE CIT CT 100 1k 10k 100k 1M 10M 100M Frequency Hz Insert impedance of N2893A Input Impedance ohm NL Lull NUL NON TI NIT al LU LI s LLLI LUI 0 001 0 01 De
6. ations Measurement Characteristics See note 1 below Probe Bandwidth Accuracy Probe Only Risetime2 Maximum continuous current Maximum peak current Probe sensitivity Noise Insertion impedance Temperature coefficient Effect of external magnetic fields Maximum circuit voltage DC to 100 MHz 3 dB 1 of reading 1mV DC or 45 Hz to 66 Hz lt 3 5ns With InfiniiVision Series 15A peak DC ACpeak 15 ADC 10 Arms continuous Max peak 30A peak non continuous when two probes are used 30A peak DC ACpeak 30 ADC 24 Arms continuous Max peak 32A peak non continuous when one probe is used With Infiniium Series 15A peak DC ACpeak 15 ADC 10 Arms continuous 30A peak non continuous per each channel Refer to frequency derating curve Fig 2 50A for Pulse Widths lt 10 0 1V A 2 5mArms with 20 MHz Bandwidth limiting Refer to Fig 3 lt 2 0 C 40 C Equivalent to lt 20mA for a 400A m magnetic field DC to 60 Hz 300V Cat referto safety considerations and product compliances This is a specification and is guaranteed at 23 C 3 C 73 F 5 F 1 Requires 1MQ termination Valid for 23 C 3 C 73 F 5 F at least 30 minutes after power on 2 Rise time is calculated as Tr 0 35 Bandwidth Power Supply Characteristics DC supply voltage requirements 12Vde 1V Probe power consumption Increases with measured current 3 VA when measuring 15
7. by appli cable law Agilent dis claims all warranties either express or implied with regard to this man ual and any information contained herein includ ing but not limited to the implied warranties of merchantability and fit ness for a particular pur pose Agilent shall not be liable for errors or for inci dental or consequential damages in connection with the furnishing use or performance of this document or of any infor mation contained herein Should Agilent and the user have a separate writ ten agreement with war ranty terms covering the material in this document that conflict with these terms the warranty terms in the separate agree ment shall control Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license WARNING A WARNING notice denotes a hazard It calls attention to an operating procedure practice or the like that if not correctly performed or adhered to could result in personal injury or death Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met CAUTION A CAUTION notice denotes a hazard It calls attention to an operating procedure practice or the like that if not correctly performed or adhered to could result in damage to the product or loss of important data Do not proceed beyond a CAUTION
8. can be performed without power applied the power cord must be disconnected from the instrument To ensure safe operation and to obtain maximum performance from the unit observe the cautions listed below To avoid short circuits and accidents that could result in injury or death use the N2893A only with power lines carrying 300 V or less When conductors being measured carry in excess of the safe voltage level SELV E and not more than 300 V to prevent short circuits and electric shock while the core section is open make sure that conductors to be measured are insulated with material conforming to 1 Overvoltage Category I 2 Basic Insulation Requirements for Working Voltages of 300 V and 3 Pollution Degree 2 Never use this sensor on bare conductors the core and shield case are not insulated If a bare conductor is inevitable to be measured make sure that the power to the wire must be turned off when opening the jaws of the probe to insert or remove the bare wire so that 300V CAT I is always satisfied Avoid damaging the cable insulation surfaces while taking measurements This instrument is only made for use with the Infiniium Do not plug the probe into any interface other than the AutoProbe interface of which Infiniium has a protective earthing with double insulation construction Take the following precautions to ensure that the Infiniium does not form a bridge between the probe and any hazardous live part 1 Is
9. ee ment and written consent from Agilent Technologies Inc as governed by United States and international copyright laws Manual Part Number N2893 97001 March 2012 Print History N2893 97001 March 2012 N2893 97000 January 2011 Agilent Technologies Inc 1900 Garden of the Gods Rd Colorado Springs CO 80907 USA Restricted Rights Legend If software is for use in the per formance of a U S Govern ment prime contract or subcontract Software is deliv ered and licensed as Commer cial computer software as defined in DFAR 252 227 7014 June 1995 or as a commer cial item as defined in FAR 2 101 a or as Restricted com puter software as defined in FAR 52 227 19 June 1987 or any equivalent agency regula tion or contract clause Use duplication or disclosure of Software is subject to Agilent Technologies standard com mercial license terms and non DOD Departments and Agen cies of the U S Government will receive no greater than Restricted Rights as defined in FAR 52 227 19 c 1 2 June 1987 U S Government users will receive no greater than Limited Rights as defined in FAR 52 227 14 June 1987 or DFAR 252 227 7015 b 2 November 1995 as applica ble in any technical data Document Warranty The material contained in this document is provided as is and is subject to being changed without notice in future editions Further to the maximum extent permitted
10. eing measured See figure 2 in Characteristics and Specifications If excess current is input generated heat activates a built in safety function that blocks normal output If this happens remove the input immediately unclamp the sensor from the conductor being measured or reduce the input current to zero Wait until the sensor has had sufficient time to cool before resuming operation Even if the input current does not exceed the rated continuous maximum continuous input for an extended period of time may result in activation of the safety circuit to prevent damage resulting from heating of the sensor At high ambient temperatures the built in safety circuit may activate at current input levels below the rated continuous maximum Continuous input of current exceeding the rated maximum or repeated activation of the safety function may result in damage to the unit When opening the sensor head of the probe be sure to operate with the opening lever If an upper core is forced to open when the sensor head is locked the open close mechanism can be damaged Upper core Lock state Do not Press Do NOT measure current such that the total probe current consumption exceeds the allowable AutoProbe interface current consumption The excess current consumption causes a temporary shutdown of the Infiniium power supply for safety Quit the measurement and cycle the power of the Infiniium if the shutdown occurs The typical probe current co
11. ement may be impossible in locations subject to strong external magnetic fields such as transformers and high current conductors or in locations subject to strong external electric fields such as radio transmission equipment At high frequencies common mode noise may affect measurements taken on the high voltage side of circuits If this occurs reduce the frequency range of the waveform measuring instrument or clamp onto the low voltage side of the circuit as shown in figure 5 as appropriate Power Source ho Low Figure 5 Low voltage side of the 17 Service Strategy For calibration testing return the N2893A probe to an Agilent Service Center If the probe is under warranty normal warranty services apply If the probe is not under warranty replacement costs will be applied To return the Probe to Agilent Technologies for Service Call 877 447 7278 for further details and the location of your nearest Agilent Technologies Service Office or go to www agilent com for contact information Write the following information on a tag and attach it to the probe e Name and address of the owner Probe model number Description of service required or failure indications Retain all accessories Return the probe in its case or pack the probe in foam or other shock absorbing material and place it in a strong shipping container You can use the original shipping materials or order materials from an Agilent Technologi
12. es Sales Office If neither are available place 9 to 4 inches of shock absorbing material around the instrument and place it in a box that does not allow movement during shipping Seal the shipping container securely Mark the shipping container as FRAGILE In all correspondence refer to the instrument by model number and full serial number 18 Calibration Testing Procedures These procedures are used to test the warranted specifications for the N2893A Differential Probe The recommended calibration test interval for the N2893A is once a year or as required Use the equipment listed in the Test Equipment Required section to complete the Calibration Testing Procedure Test Equipment Required Description Minimum Requirements Recommende Used at d test equipment Infiniium Bandwidth gt 250 MHz Any 1 2 3 4 Amplitude accuracy lt 0 4 0Scilloscope with 1MQ input Current loop wire 16 AWG Convenient length AC current C 10 Arms 50 Hz sine wave Wavetek 9100 1 generator Amplitude accuracy lt 0 3 50Q current loop N2774 23801 4 Preliminary procedure 1 Turn on the oscilloscope and then connect the N2893A probe to the it Turn on the other equipment 2 Wait 30 minutes to warm up the equipment 19 1 AC Accuracy 1 Press the DEMAG button on the Terminator 2 Connect the wire to the current terminals of the AC current generator 3 Clamp the wire with the N2893A and lock the sensor head
13. iVision and Infiniium scope with 1 MQ AutoProbe interface e Auto degauss and offset elimination e Easy protect function at excessive input Scope Compatibility e 3000 X Series oscilloscopes e 5000 6000 except 100 MHz models and 7000 Series oscilloscopes with software version 6 10 or higher e 9000A Series with software version 3 0 or higher e 90000 X Series with the N5449A adapter Inspection When the unit is delivered check and make sure that it has not been damaged in transit If the unit is damaged or fails to operate according to the specifications contact your dealer or Agilent representative Contents Note on Safety 4 Safety Symbols Safety Considerations 4 5 T Characteristics and Specifications Description of Parts Measurement Characteristics Power Supply Characteristics Mechanical Characteristics Environmental Characteristics 11 Preparations for Measurement Demagnetization Procedure Measurement Procedure 14 Service Strategy 18 To return the Probe to Agilent Calibration Testing Procedures Test Equipment Required 19 Preliminary procedure 19 1 AC Accuracy 20 Calibration Test Record 21 9 9 10 10 10 13 14 Technologies for Service 18 19 Note on Safety This equipment is designed according to IEC 61010 1 Safety Standards aware and has been tested for safety prior to shipment Incorrect measurement procedures could result in injury or death as well as damage to the equipmen
14. l substitute parts or perform any unauthorized modification to the instrument Capacitors inside the instru ment may retain a charge even if the instrument is discon nected from its source of sup ply Do not operate the instru ment in the presence of flam mable gasses or fumes Operation of any electrical instrument in such an environ ment constitutes a definite safety hazard Do not use the instrument in a manner not specified by the manufacturer To clean the instrument If the instrument requires cleaning 1 Remove power from the instrument 2 Clean the external surfaces of the instrument with a soft cloth dampened with a mixture of mild detergent and water 3 Make sure that the instrument is completely dry before recon necting it to a power source Safety Symbols A Instruction manual symbol the product is marked with this symbol when it is necessary for you to refer to the instruc tion manual in order to protect against damage to the prod uct Hazardous voltage symbol Earth terminal symbol Used to indicate a circuit common con nected to grounded chassis Agilent Technologies P O Box 2197 1900 Garden of the Gods Road Colorado Springs CO 80901 Notices Agilent Technologies Inc 2011 2012 No part of this manual may be reproduced in any form or by any means including elec tronic storage and retrieval or translation into a foreign lan guage without prior agr
15. nnected Wait until this waveform is no longer displayed Demagnetization and Zero Offset Procedure For InfiniiVision Oscilloscopes Press the input channel button 1 2 3 or 4 on the front panel of the oscilloscope for the channel you are using and then press the Probe softkey under the display You will then see a softkey for automatically setting the demagnetization and offset Press this key The oscilloscope will then guide you through the process For Infiniium Oscilloscopes In the Infiniium application go to Setup gt Probes and click the button in the GUI to automatically start the demagnetization and zero offset process The GUI will then guide you through the procedure Measurement Procedure Ensure all safety warnings and precautions are followed Perform the Demagnetization and Zero Adjustment procedure above Clamp the sensor head around the conductor to be measured To obtain the best accuracy ensure that a The current direction indicator on the sensor aligns with actual current direction in the conductor b The sensor opening lever is in the Locked position c The cable is centered in the sensor head 14 AAWARNING The maximum continuous input range is based on heat that is internally generated during measurement Never input current in excess of this level Exceeding the rated level may result in damage to the probe The maximum continuous input range varies according to the frequency of the current b
16. notice until the indicated conditions are fully understood and met www agilent com Agilent Technologies Inc 2011 2012 Second edition March 2012 N2893 97001 ES Agilent Technologies
17. nsumption from the AutoProbe interface is shown in figure 4 15 16 400 E AC f 50Hz 300 DC 2 200 e oO 100 5 0 0 5 10 15 Current to be measured A Figure 4 Typical probe consumption Immediately after powering on this unit may be subject to an appreciable offset drift due to the effect of self heating To counteract this allow the unit to warm up for about 30 minutes before carrying out measurement When performing continuous measurements it is necessary to be aware that the zero offset voltage will drift if the ambient temperature changes Under certain circumstances oscillation may occur if the probe is connected to the AutoProbe interface while the Infiniium is on This does not indicate a malfunction Oscillation can be stopped and operation restored to normal by opening and closing the sensor head At some frequencies some sound may be produced by resonance this has no effect on measurements Measurement accuracy is affected by the position of the conductor being measured within the clamp aperture The conductor should be in the center of the clamp aperture Before making a measurement press the opening lever until the UNLOCK indication disappears and check that the sensor head is properly closed If the sensor head is not properly closed accurate measurement will not be possible Accurate measur
18. olate the AutoProbe interface to which the probe is connected from other AutoProbe interfaces using basic insulation conforming to the overvoltage category working voltage and pollution degree requirements of the circuit being tested 2 If basic insulation requirements cannot be met between the AutoProbe interface to which this unit is connected and other AutoProbe interfaces of the measuring instrument make sure that the voltage input to the AutoProbe interfaces does not exceed the safe voltage level SELV E 3 Read and observe all warnings and precautions relating to electrical safety for the Infiniium Refer to the following standards regarding the meanings of underlined terms IEC61010 1 IEC61010 2 031 IEC61010 2 032 A WARNING A CAUTION ji To prevent electric shock do not allow the unit to become wet and do not use the unit when your hands are wet Do not subject the unit to vibrations or shocks during transport or handling Be especially careful to avoid dropping the unit Do not store the unit where it will be exposed to direct sunlight high temperature high humidity or condensation If exposed to such conditions the unit may be damaged the insulation may deteriorate and the unit may no longer satisfy its specifications Before using the unit inspect it and check the operation to make sure that the unit was not damaged due to poor storage or transport conditions If damage is found contact your dealer or
19. rection indication Sensor Terminator Opening lever Operating lever for opening the sensor head Always use this lever to open the sensor head Sensor head This clamps the conductor being measured and carries out the actual current measurement It is a precision assembly including a molded component a ferrite core and a Hall effect element It may be damaged if subjected to sudden changes in ambient temperature or mechanical strain or shock Care should be exercised when handing the sensor head Demagnetizing switch DEMAG This demagnetizes the core if it has been magnetized by switching the power on and off or by an excessive input Always carry out demagnetizing before measurement The demagnetizing process takes about one second During demagnetizing a demagnetizing waveform is output Coarse adjustment trimmer This adjustment should only be carried out if the probe offset is outside the range of the zero adjustment The output of this unit is terminated internally The high impedance such as 1 MQ input impedance will be automatically selected on the Infiniium as the Terminator is plugged into the AutoProbe interface With an input impedance of 50 Q accurate measurement is not possible The probe output sensitivity 0 1 V A will be automatically selected as the Terminator is plugged into the AutoProbe interface With an different output sensitivity accurate measurement is not possible Characteristics and Specific
20. t Please read this manual carefully and be sure that you understand its contents before using the equipment The manufacturer disclaims all responsibility for any accident or injury except that resulting due to defect in its product Safety Symbols This User s Guide provides information and warnings essential for operating this equipment in a safe manner and for maintaining it in safe operating condition Before using this equipment be sure to carefully read the following safety notes AY peni refer to accompanying documents ndicates DC Direct Current or AC Alternating Current The following symbols are used in this User s Guide to indicate the relative importance of cautions and warnings Indicates that incorrect operation presents extreme ADANGER danger of accident resulting in death or serious injury to the user Indicates that incorrect operation presents significant awanane danger of accident resulting in death or serious injury to the user ete that incorrect operation presents possibility of injury to the user or damage to the equipment a or ir items of advice related to performance of the NOTE equipment or to its correct operation A WARNING ANDANGER B D Safety Considerations Only trained service personnel who are aware of the hazard involveds for example fire and electric shock should perform maintenance on the instrument When maintenance
21. viation 90 ILL LL lu M 0 1 Input Current A AC 50Hz DC Amplitude accuracy characteristic of N2893A 12 Measurement Procedure Preparations for Measurement Power on the oscilloscope Connect the probe terminator to one of the scope channels When the probe is connected to a scope channel the AutoProbe interface will recognize the probe as an N2893A and will automatically make several settings on the channel to which the probe is connected e This probe is NOT compatible with 50Q only Infiniium oscilloscopes for example the 90000A series oscilloscopes Use the N5449A high impedance probe adapter for use with Infiniium 90000X Series oscilloscope The input coupling is automatically selected to DC as the terminator is plugged into the AutoProbe interface 13 A CAUTION 1 2 Demagnetization Procedure Refer to the Description of Parts section of this manual when performing this procedure Allow both the Infiniium oscilloscope and the probe to warm up for at least 30 minutes before making these adjustments Ensure that the channel offset is set to 0 V on the oscilloscope channel to which the probe is connected Ensure that the probe sensor is NOT clamped around any conductors Slide the probe sensor Opening Lever into the Locked position Press the DEMAG button on the terminator A demagnetization waveform will be displayed for a short time on the channel to which the probe is co
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