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N7040A/1A/2A Rogowski AC Current Probes User Guide

35

Overview

4

Frequency Content above the Probe Bandwidth

Attempting to make measures on signal sources which include higher frequency components will

result in measurement accuracy issues. To make the most accurate measurements, the signals to be

measured should not have frequency content above the probe’s bandwidth and should have rise

times greater than 20 ns.

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Summary of Contents for N7040A

Page 1: ...Keysight N7040A 1A 2A Rogowski AC Current Probes User Guide ...

Page 2: ...n its End User License Agreement EULA a copy of which can be found at http www key sight com find sweula The license set forth in the EULA represents the exclusive authority by which the U S government may use modify distribute or disclose the Soft ware The EULA and the license set forth therein does not require or permit among other things that Keysight 1 Furnish tech nical information related to...

Page 3: ... 3 Setting up and Using the Probe Step 1 Connect to a Compatible Keysight Oscilloscope 24 Compatibility with Oscilloscopes 24 Step 2 Connect to a De energized Conductor Under Test 26 Step 3 Power Up 27 Replacing Batteries 27 Step 4 Switch ON the Probe 28 Step 5 Configure the Probe Settings in the Oscilloscope Software GUI 29 On an Infiniium Oscilloscope 29 On an InfiniiVision Oscilloscope 31 4 Mak...

Page 4: ...4 N7040A 1A 2A Rogowski AC Current Probes User Guide Contents 5 Returning the Probe for Repair or Service Contacting Keysight Technologies 39 ...

Page 5: ...ge 8 Features 9 Specifications and Characteristics 11 Inspecting the Probe 14 Cleaning the Probe 15 Probe Handling Precautions 16 This chapter introduces the three models available under Keysight Rogowski AC Current probing range and lists their features usage characteristics and specifications ...

Page 6: ...e 1 N7040A 1A 2A Probe Components The figure shows the N7042A probe Rogowski Coil Free end of the Coil Ferrule Batteries Output Cable Connecting Cable BNC Output Socket External Power Adapter Socket Power Button Status Indicator LED Power Supply Adapter Component Description Rogowski Coil The sensor loop of the probe that is clipped around a conductor under test This coil is thin and delicate and ...

Page 7: ...w more Power Button The push button to switch the probe ON OFF Status Indicator LED The LED adjacent to the Power button to indicate the current status of the probe Green Indicates that the probe is switched ON Also indicates that the batteries used in the probe are charged Red Indicates that the batteries used in the probe are depleted and must be replaced Off Indicates that the probe is switched...

Page 8: ... To measure power losses in semiconductors To monitor currents in small inductors capacitors snubber circuits etc To measure small AC current on a conductor with high DC current or in the presence of a high DC magnetic field An example can be monitoring capacitor ripple To measure high frequency sinusoidal pulsed or transient currents from power frequency to rf applications To measure current in m...

Page 9: ...dB high frequency bandwidth upto 23MHz 3dB low frequency bandwidth 3Hz Peak di dt capability upto 80kA µs Wide operating temperature from 40o C to 125o C Terminated into 1MΩ scope input Positional accuracy typically 2 N7041A 4 5mm thick miniature clip around Rogowski coil with 5kV peak insulation A novel electrostatic shielded Rogowski coil providing excellent immunity to interference from fast lo...

Page 10: ... 2kV peak insulation Peak current rating upto 300A 3dB high frequency bandwidth upto 30MHz 3dB low frequency bandwidth 9 2Hz Peak di dt capabilities upto 20kA µs Wide operating temperature range 40o C to 125o C Terminated into 1MΩ scope input Positional accuracy typically 2 Non intrusive and loads the circuit under test by only a few pH ...

Page 11: ...1Mohm scope input Calibration Calibrated to 0 2 reading with conductor positioned central in the coil loop Positional Accuracy 2 variation of accuracy Refer to the topic Positioning the Rogowski Coil Accurately on page 34 to know more about how positional accuracy can help you obtain best measurements Linearity 0 05 of reading Max Noise 8 mVp p 10 mVp p 15 mVp p Coil insulation 5kV Peak 5kV Peak 1...

Page 12: ...ions Refer to Probe Dimensions on page 13 Minimum Bend Radius of the Coil 14mm 14mm 10mm Characteristic N7040A N7041A N7042A Use For indoor use only Temperature operating Coil and Cable 40 C to 125 C Integrator 0 C to 40 C Coil and Cable 40 C to 125 C Integrator 0 C to 40 C Coil and Cable 20 C to 125 C Integrator 0 C to 40 C Altitude operating 4000m Altitude non operating 15000m Maximum relative h...

Page 13: ...AC Current Probes User Guide 13 Overview 1 Probe Dimensions The N7040A N7041A N7042A probe dimensions shown below are in millimeters Refer to Table on page 13 to get information on mechanical characteristics of these probes ...

Page 14: ...aged notify your Keysight Technologies Sales Office Inspect the probe If there is mechanical damage or defect or if the probe does not operate properly or pass calibration tests notify your Keysight Technologies Sales Office If the shipping container is damaged or the cushioning materials show signs of stress notify the carrier as well as your Keysight Technologies Sales Office Keep the shipping m...

Page 15: ... any circuit under test 2 Turn the probe OFF 3 Gently clean the cable and coil with a soft cloth dampened with a mild soap and water solution 4 Wipe with clean water to remove the detergent and then dry thoroughly with a clean cloth WARNING Do not try to clean the probe using cleaners containing organic solvents such as benzine alcohol acetone ether ketones thinners or gasoline These may cause dis...

Page 16: ...d as shown in the picture below For the N7040A N7041A probes ensure that the coil is correctly and fully inserted inside the probe s ferrule as illustrated in the figure below For the N7042A probe the coil has a friction fit It is considered fully inserted into the ferrule when you can no further ease the coil s free end into the ferrule Incorrect Coil Insertion Marker line on the coil is visible ...

Page 17: ...mage the coil insulation Take care not to put any force onto the cable attached to the coil This may damage the coil CAUTION While bending the coil around a conductor keep the minimum bend radius of the coil into consideration to avoid damage to the coil N7040A 14 mm N7041A 14 mm N7042A 10 mm NOTE It is recommended to store the coil in its protective case when not in use ...

Page 18: ...1 Overview 18 N7040A 1A 2A Rogowski AC Current Probes User Guide ...

Page 19: ...e been supplied in a safe condition These probes conform to international standards including IEC 61010 1 and IEC 61010 2 032 Throughout this manual and specifically in this chapter there are information and warnings that must be followed by the user to ensure safe operation and to maintain the product in a safe condition If the probe is used in a manner not specified by the manufacturer the prote...

Page 20: ...grity of the insulation around the Rogowski coil must be VISUALLY INSPECTED before and after each use and the probe must NOT BE USED if there are signs of coil damage WARNING Be extremely careful when using the coil of the probe on uninsulated conductors The power of the uninsulated conductor must be turned off when applying or removing the probe s coil from this conductor In addition make sure th...

Page 21: ...handling huge current overloads without damaging or saturating the probes it is crucial that the absolute maximum rated di dt for the probe is not exceeded Refer to the Table on page 13 to know these ratings WARNING These probes and the oscilloscope must be properly grounded when used Making the connection between the oscilloscope and probe using the BNC cable grounds the BNC input for the probe P...

Page 22: ...es for the China RoHS requirements A registered trademark of the Spectrum Management Agency of Australia This signifies compliance with the Australia EMC Framework regulations under the terms of the Radio Communication Act of 1992 Notice for the European Community This product complies with the WEEE Directive 2002 96 EC marking requirements The affixed label indicates that you must not discard thi...

Page 23: ...ng up and Using the Probe Step 1 Connect to a Compatible Keysight Oscilloscope 24 Step 2 Connect to a De energized Conductor Under Test 26 Step 3 Power Up 27 Step 4 Switch ON the Probe 28 Step 5 Configure the Probe Settings in the Oscilloscope Software GUI 29 ...

Page 24: ...es InfiniiVision Oscilloscopes S Series 6000L Series 9000 Series 6000 X Series 9000 H Series 4000 X Series 3000 X Series 3000T X Series 2000 X Series 1000 X Series 1000 Series Infiniium Software Version InfiniiVision Software Version Compatible with all Infiniium software versions Recommended version 6 10 or higher Compatible with all InfiniiVision software versions WARNING Grounding is critical t...

Page 25: ...e 25 Overview 3 CAUTION When disconnecting the BNC cable from the oscilloscope be sure to release the lock then pull the connector Forcibly pulling the connector without releasing the lock or pulling on the cable will result in damage to the connector ...

Page 26: ...ning the Rogowski Coil Accurately on page 34 to know more 3 Insert the free end of the coil fully inside the probe s ferrule as described in the Probe Handling Precautions on page 16 Ensure that the loop is closed properly 4 Re energize the conductor under test WARNING Visually inspect the Rogowski coil to check for the integrity of the insulation around the coil The probe must NOT BE USED if ther...

Page 27: ...glows Red indicating low battery To replace the battery switch off the probe remove the battery cover and replace with standard AA alkaline batteries CAUTION Before applying power ensure that all connections to the probe have been made Also verify that all safety precautions have been taken CAUTION The external power supply adapter Keysight part number 0950 5831 provided with the probe must be use...

Page 28: ...essing and releasing this button The Status LED adjacent to the Power button turns Green indicating that the probe is switched ON 2 To switch OFF the probe depress the Power button fully NOTE After you switch ON the probe wait for upto 2 minutes before you start making any measurements This is to allow the probe to warm up so that accurate measurements can be taken ...

Page 29: ...the Probe Configuration dialog box The N7040A 41A 42A probe is not automatically identified by the oscilloscope and therefore not displayed as connected to the scope s channel 2 To manually identify the type of probe and configure its settings click Options displayed in the Probe System section of the scope channel to which the current probe is connected In the above screen the settings for the N7...

Page 30: ...do so access the Channel dialog box by clicking Setup Channel N option from the menu on the top 6 In the Channel dialog box confirm that the following settings are configured correctly for the channel The Vertical scale unit of the oscilloscope should be set to Amps In the Scale field select the desired Amps per division scale for a waveform The Input Impedance of the oscilloscope channel must be ...

Page 31: ...pe and therefore you need to manually set the attenuation factor and units for the probe 1 Press the channel key to which the current probe is attached to display the Channel N menu 2 Press the Coupling softkey to set the oscilloscope s Input Coupling to AC to remove any DC offset voltage from the waveform 3 Press the Impedance softkey to set the input impedance of the oscilloscope channel to 1 MΩ...

Page 32: ... attenuation factor for your current probe The attenuation factor must match the Output Input ratio in V A printed on the label on the front side of the probe N7040A 0 002 V A 500 1 N7041A 0 01 V A 100 1 N7042A 0 02 V A 50 1 8 Measure the current and observe the waveform on the oscilloscope Remember that the actual current will be greater or less than the oscilloscope waveform if the probe attenua...

Page 33: ...ensitivity to External Currents and Voltages 36 Choosing an Appropriate Output Cable 37 Measurements Supported 38 This chapter provides guidelines that you would find useful in obtaining the best measurements accuracy using the N7040A 41A 42A probes It also provides an overview of some relevant measurements that you can make using these probes on a compatible Keysight oscilloscope ...

Page 34: ...cent to the ferrule or the probe cable attachment as illustrated by the shaded area in the picture below The N7040A 41A 42A probes have been calibrated with the conductor near the center indicated by position A in the picture below The picture also shows the direction a positive current should pass through the coil loop to obtain a positive output voltage For the best high frequency performance th...

Page 35: ...th Attempting to make measures on signal sources which include higher frequency components will result in measurement accuracy issues To make the most accurate measurements the signals to be measured should not have frequency content above the probe s bandwidth and should have rise times greater than 20 ns ...

Page 36: ...voltages In the vicinity of a multi turn conductor the effects are far stronger than from a single conductor carrying the same current and such positions should be avoided If there is a surface with a high voltage very close to the coil and the voltage is subject to high rates of change for example 1kV ìs or high frequency oscillations in the MHz range then measurement errors can arise due to capa...

Page 37: ...5m BNC to BNC 50 Ω cable to establish connectivity between the probe and oscilloscope If needed you may use a longer cable that meets the requirement of a 50 Ω single screened coaxial cable type Also though the use of extension cables may not be problematic from the noise viewpoint but consideration should be given to the routing of very long cables ...

Page 38: ... current measurement using these probes Some of these measurements are listed below You can find a detailed description of each of the supported measurement in the online help for the Infiniium InfiniiVision GUI Peak Peak Peak Contrast RMS Rise Time Frequency NOTE For measurements such as RMS there are two types available AC and DC Ensure that you select the type as AC for such measurements ...

Page 39: ...ample MYXXXXXXXX Description of failure or service required 3 Protect the probe by wrapping in plastic or heavy paper Use original packaging or comparable 4 Pack the probe in the original carrying case or if not available use bubble wrap or packing peanuts 5 Place securely in sealed shipping container and mark container as FRAGILE If any correspondence is required refer to the product by serial nu...

Page 40: ...5 Returning the N7004A for Repair or Service 40 N7040A 1A 2A Rogowski AC Current Probes User Guide ...

Page 41: ...N7040A 1A 2A Rogowski AC Current Probes User Guide 41 ...

Page 42: ...This information is subject to change without notice Keysight Technologies 2017 Edition 1 October 2017 N7040 97000 www keysight com ...

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