Keysight N7040A User Manual
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Keysight N7040A User Manual

Keysight N7040A User Manual

Rogowski ac current probes
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Keysight N7040A/1A/2A
Rogowski AC Current
Probes
User Guide

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Summary of Contents for Keysight N7040A

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

  • Page 2: Safety Notices

    FAR and the DFARS and are set forth specifically in writing elsewhere in the EULA. Keysight shall be under no obliga- tion to update, revise or otherwise modify the Software. With respect to any technical data as defined by FAR 2.101, pursuant to...

  • Page 3: Table Of Contents

    Pre-Use Safety Checks and Warnings Instrument Markings 3 Setting up and Using the Probe Step 1 - Connect to a Compatible Keysight Oscilloscope Compatibility with Oscilloscopes Step 2 - Connect to a De-energized Conductor Under Test Step 3 - Power Up...
  • Page 4 Contents 5 Returning the Probe for Repair or Service Contacting Keysight Technologies N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 5: N7040A/1A/2A - Overview

    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: Introduction

    Overview Introduction The N7040A/1A/2A Rogowski AC Current probes allow you to monitor AC current flowing through a conductor. These probes provide accurate, non-contact measurement of AC currents over a broad frequency range thereby ensuring high bandwidth performance with minimal disruption to the circuit under test.
  • Page 7 The power supply adapter (part number 0950-5831) is also included with the probe to power the probe using an external DC supply. Refer to the topic “Step 3 - Power Up" on page 27 to know more. N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 8: Usage

    • In MOSFET or IGBT devices as small as TO-220 or TO-247 in case of the N7042A probe. • In MOSFET or IGBT devices as small as TO-247 or around the terminals of large power modules in case of the N7040A / N7041A probes. • In bond wires in power devices •...

  • Page 9: Features

    Overview Features Keysight provides three models (N7040A, N7041A, and N7042A) under the Rogowski AC Current probes. The following tables list the key features of each of these models. N7040A • 4.5mm thick miniature clip-around Rogowski coil with 5kV peak insulation.
  • Page 10 Wide operating temperature range -40 C to +125 Ω • Terminated into 1M scope input • Positional accuracy typically ±2% • Non-intrusive and loads the circuit under test by only a few pH N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 11: Specifications And Characteristics

    5.5mm Jack Socket – Centre Positive Tip Adapter Supply Voltage 100 – 240VAC Adapter Supply Frequency 50 - 60Hz Adapter Supply Current 450mA Max @ 100VAC Input Supply Voltage Fluctuation up to 10% N7040A/1A/2A Rogowski AC Current Probes User Guide...
  • Page 12 80% for temperatures up to 31°C decreasing linearly to 50% relative humidity at 40°C Installation Category Installation Category III, Installation Category III, Installation Category II, Pollution Degree 2. Pollution Degree 2. Pollution Degree 2. Overvoltage Transient Cat III 600V Cat III 600V Cat II 600V N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 13: Probe Dimensions

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

  • Page 14: Inspecting The Probe

    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 materials for the carrier’s inspection. The Keysight Technologies office will arrange for repair or replacement at Keysight Technologies’...

  • Page 15: Cleaning The Probe

    Do not try to clean the probe using cleaners containing organic solvents such WARNING as benzine, alcohol, acetone, ether, ketones, thinners, or gasoline. These may cause discoloration or damage. Make sure the probe is completely dry before reconnecting it for use. N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 16: Probe Handling Precautions

    Unclip the coil from its free end 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. Correct Coil Insertion...

  • Page 17: General Coil Handling Precautions

    N7040A - 14 mm N7041A - 14 mm N7042A - 10 mm It is recommended to store the coil in its protective case when not in use. NOTE N7040A/1A/2A Rogowski AC Current Probes User Guide...
  • Page 18 Overview N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 19: Safety And Regulatory Information

    N7040A/1A/2A Rogowski AC Current Probes User Guide Safety and Regulatory Infor- mation Pre-Use Safety Checks and Warnings / 20 Instrument Markings / 22 These probes have been designed and tested in accordance with accepted industry standards, and have been supplied in a safe condition. These probes conform to international standards including IEC 61010-1 and IEC 61010-2-032.

  • Page 20: Pre-Use Safety Checks And Warnings

    In addition, make sure that the probe is never used at voltages greater than its voltage rating (safe PEAK working voltage) which is clearly labeled on the probe cable adjacent to the coil. For N7040A and N7041A, it is 5kV peak and for N7042A, it is 1.2kV peak.
  • Page 21 - N7042A coil (rated for 1.2kV peak) is flash tested for one minute at 3.0kVrms using a 50Hz sine-wave voltage. - N7040A and N7041A coils (rated for 5kV peak) are flash tested for one minute at 8kVrms using a 50Hz sine-wave voltage.

  • Page 22: Instrument Markings

    “Monitoring and Control Instrumentation” product. Do not dispose in domestic household waste. To return unwanted products, contact your local Keysight office. The product is marked with this symbol when it is necessary for the user to refer to the instructions in the documentation.

  • Page 23: Setting Up And Using The Probe

    User Guide Setting 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...

  • Page 24: Step 1 - Connect To A Compatible Keysight Oscilloscope

    Overview Step 1 - Connect to a Compatible Keysight Oscilloscope Compatibility with Oscilloscopes You can use these probes with any Keysight Infiniium or InfiniiVision oscilloscope that has the NOTE 1MΩ BNC input. Infiniium Oscilloscopes InfiniiVision Oscilloscopes S-Series 6000L Series 9000 Series...
  • Page 25 When disconnecting the BNC cable from the oscilloscope, be sure to CAUTION 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. N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 26: Step 2 - Connect To A De-Energized Conductor Under Test

    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. Re-energize the conductor under test. N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 27: Step 3 - Power Up

    Before applying power, ensure that all connections to the probe have been CAUTION made. Also, verify that all safety precautions have been taken. You can power up the N7040A/41A/42A probes by using: • External DC power supply - The DC voltage must be 12V (±10%).

  • Page 28: Step 4 - Switch On The Probe

    After you switch ON the probe, wait for upto 2 minutes before you start NOTE making any measurements. This is to allow the probe to warm up so that accurate measurements can be taken. N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 29: Step 5 - Configure The Probe Settings In The Oscilloscope Software Gui

    On an Infiniium Oscilloscope Choose Setup > Probe Configuration... to open 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. 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.
  • Page 30 • The Input Impedance of the oscilloscope channel must be set to 1 MΩ to make accurate measurements. • Set the oscilloscope’s Input Coupling to AC to remove any DC offset voltage from the waveform. These settings are highlighted in the following screen. N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 31: On An Infiniivision Oscilloscope

    On an InfiniiVision Oscilloscope The N7040A/41A/42A probe is not automatically identified by the oscilloscope and therefore you need to manually set the attenuation factor and units for the probe. Press the channel key to which the current probe is attached to display the Channel <N> menu.
  • Page 32 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 attenuation has not been set accurately. N7040A/1A/2A Rogowski AC Current Probes User Guide...

  • Page 33: Making Measurements

    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: Positioning The Rogowski Coil Accurately

    • The N7040A/41A/42A probes have been calibrated with the conductor near the center (indicated by position A in the picture below). •...

  • Page 35: Frequency Content Above The Probe Bandwidth

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

  • Page 36: Handling Probe's Sensitivity To External Currents And Voltages

    Handling Probe’s Sensitivity to External Currents and Voltages The sensitivity of the N7040A/41A/42A probes to currents that are outside the closed loop of the Rogowski coil is very small, provided that the external currents are less than the current rating of the probe or that such currents are relatively distant from the coil.

  • Page 37: Choosing An Appropriate Output Cable

    Overview Choosing an Appropriate Output Cable The N7040A/41A/42A probes are shipped with a 0.5m 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.

  • Page 38: Measurements Supported

    Infiniium / InfiniiVision GUI. Peak Peak-Peak Contrast Rise Time Frequency For measurements such as RMS, there are two types available - AC and DC. NOTE Ensure that you select the type as AC for such measurements. N7040A/1A/2A Rogowski AC Current Probes User Guide...
  • Page 39 Returning the Probe for Repair or Service If the probe is found to be defective, it is recommended to send it to a Keysight authorized service center for all repair and service needs. If the probe is under warranty, normal warranty services apply. If the probe is not under warranty, repair costs will be applied.
  • Page 40 Returning the N7004A for Repair or Service N7040A/1A/2A Rogowski AC Current Probes User Guide...
  • Page 41 N7040A/1A/2A Rogowski AC Current Probes User Guide...
  • Page 42 This information is subject to change without notice. © Keysight Technologies 2017 Edition 1, October 2017 N7040-97000 www.keysight.com...

This manual is also suitable for:

N7041aN7042a

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