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N2780/1B Current Probes

N2780/1/2/3B User’s Guide

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Zero Adjustment Dial (ZERO ADJ)

Use the zero adjustment dial to correct for the effect of a voltage offset or

temperature drift on the device. When beginning a measurement, after

demagnetizing, always carry out a zero adjustment.

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Summary of Contents for N2780B

Page 1: ...Keysight N2780 1 2 3B Current Probes User s Guide ...

Page 2: ...stomers under its standard com mercial license which is embodied in 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 othe...

Page 3: ...turning the Probe for Service 46 The N2780B series current probes are high bandwidth active current probes featuring flat bandwidth low noise 2 5 mArms and low circuit insertion loss In conjunction with the companion N2779A power supply this probe can be used with any oscilloscope having a high impedance BNC input The N2779A 3 x 12 Vdc output lets you connect up to any three N2780 1 2 3B current p...

Page 4: ...s 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 materials for the carrier s inspection The Keysight Technologies office will arrange for repair or replacement at Keysight Technol...

Page 5: ...ng 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 of shock and therefore great care should be exercised in handling it Lock Mechanism The lever lock mechanism keeps the clamp closed Clamp Clamps around...

Page 6: ...ys carry out demagnetizing before a measurement The demagnetizing process takes about 3 seconds During demagnetizing a demagnetizing waveform is output BNC Output Connector Connect to the oscilloscope s BNC input connector Turn the collar until it clicks and check that it is locked securely NOTE The output of the current probe is terminated internally You must select the input impedance of the osc...

Page 7: ...User s Guide 7 Zero Adjustment Dial ZERO ADJ Use the zero adjustment dial to correct for the effect of a voltage offset or temperature drift on the device When beginning a measurement after demagnetizing always carry out a zero adjustment ...

Page 8: ...the range of the zero adjustment dial 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 maybe damaged if subjected to sudden changes in ambient temperature or mechanical strain or shock Care should be exercised when handing the sensor head Opening Le...

Page 9: ... BNC input connector Turn the collar until it clicks and check that it is locked securely NOTE The output of the current probe is terminated internally You must select the input impedance of the oscilloscope to be 1 MΩ to make accurate measurements If the oscilloscope you are using does not have a 1 MΩ input impedance setting you can purchase the E2697A 50Ω to 1 MΩ adapter The output resistance of...

Page 10: ...front panel power indicator lights Demagnetization and Zero Adjustment NOTE The output of the current probe is terminated internally Use a high impedance input to the measuring instrument Accurate measurements are not possible when the input impedance of the oscilloscope is set to 50Ω Be sure to set the input impedance to 1 MΩ before making measurements If the oscilloscope input impedance cannot b...

Page 11: ...t demagnetize while the conductor being measured is clamped This could damage the components of the circuit being measured Also check that the conductor being measured is not clamped when supplying power to the current probe for the same reason Demagnetized waveforms are generated when switching on the supply 7 Ensure that the probe sensor is NOT clamped around any conductors 8 Slide the probe s O...

Page 12: ...ngth Measurement WARNING Check that the system is safe and that the preparations described in Safe Probing on page 13 have been carried out 11 Press the opening lever to open the sensor head 12 Align the sensor so that the probe s current direction indication corresponds to the direction of current flow through the conductor to be measured Also align the clamp so that the conductor is in the cente...

Page 13: ...gh frequency currents or currents that contain high frequency components Eddy current loss may cause heating of the sensor head Dielectric heating may cause heating of cord insulation and other materials This device should only be connected to the secondary side of a breaker so the breaker can prevent an accident if a short circuit occurs Connections should never be made to the primary side of a b...

Page 14: ...he probe WARNING To avoid electric shock when measuring live lines wear appropriate protection gear such as insulated rubber gloves boots and a safety helmet CAUTION To avoid damage to the device protect it from vibration or shock during transport and handling and be especially careful to avoid dropping CAUTION Do not store or use the device where it could be exposed to direct sunlight high temper...

Page 15: ...of the sensor head can cause acoustic resonance and degrade measurement so it should be cleaned by gently wiping with a soft cloth CAUTION To avoid damaging the sensor cable and power supply cable do not bend or pull the cables CAUTION Do not apply a static electricity or other source of high voltage to the sensor Doing so may damage its internal Hall elements and circuitry CAUTION Avoid stepping ...

Page 16: ...even if the electric current is lower than the consecutive maximum current electric currents in both sides will heat up the wires and raise the temperature thereby causing damage to the sensor Figure 5 Avoid Un Clamped Conductor Near Sensor Head CAUTION The maximum continuous input range is based on heat that is internally generated during measurement Never input current in excess of this level Ex...

Page 17: ...jury electric shock due to short circuits or damage to the device that may be caused by the increased temperature CAUTION If excess current is input generated heat activates a built in safety function that blocks normal output If this happens remove the input immediately remove the sensor from the conductor being measured or reduce the input current to zero Wait until the sensor has had sufficient...

Page 18: ...robe 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 See Figure 6 Figure 6 Use the Opening Lever NOTE The output of this unit is terminated internally Use an oscilloscope with an input impedance of at least 1 MΩ or use the Keysight E2697A impedance adapter NOTE Immediately after powering on the prob...

Page 19: ...ved using the cleaning method described in this manual NOTE An increase in the volume of the resonant sound during use may indicate that the gap between the upper and lower sensors has increased in size Since the sensor characteristics may change it is recommended to calibrate the device See Returning the Probe for Service NOTE The reading may be affected by the position within the clamp aperture ...

Page 20: ...igure 7 on page 20 Although the figure shows an N2782 3B probe the same technique is used with an N2780 1B probe NOTE During demagnetization the demagnetization waveform a waveform that attenuates over time will be output from the device s output connector and displayed on the waveform measurement instrument The positive and negative components of this waveform may be asymmetrical but this does no...

Page 21: ...anner not specified by the manufacturer The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions Before Applying Power Verify that all safety precautions are taken Make all connections to the unit before applying power Note the instrument s external markings described in Table 1 on page 23 Ground the Instrument If your product is...

Page 22: ...Sales and Service Office for service and repair to ensure that safety features are maintained In Case of Damage Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel CAUTION A CAUTION notice denotes a hazard It calls attention to an operating procedure practice or the like that if n...

Page 23: ...rminal Frame or chassis ground terminal Terminal is at earth potential Equipotentiality N Neutral conductor on permanently installed equipment L Line conductor on permanently installed equipment On mains supply Off mains supply Standby mains supply The instrument is not completely disconnected from the mains supply when the power switch is in the standby position In position of a bi stable push sw...

Page 24: ...Indicates that only insulated conductors suited to the voltage of the circuit under test can be measured Application around and removal from HAZARDOUS LIVE conductors is permitted Caution hot surface Ionizing radiation Table 1 Description of Safety related symbols that may appear on a product Sheet 2 of 2 Symbol Description ...

Page 25: ...ibées Avant la mise sous tension Vérifiez que vous avez bien respecté toutes les consignes de sécurité Faites tous les branchements au niveau de l appareil avant de mettre ce dernier sous tension Tenez compte des marquages externes à l instrument décrits à la section Symboles de sécurité Mise à la terre de l instrument Si une prise de mise à la terre est fournie avec le produit le châssis et le ca...

Page 26: ...instruments endommagés ou défectueux doivent être désactivés et protégés contre toute utilisation involontaire jusqu à ce qu ils aient été réparés par une personne qualifiée ATTENTION La mention ATTENTION indique un risque Si la manoeuvre ou le procédé correspondant n est pas exécuté correctement il peut y avoir un risque de dommages à l appareil ou de perte de données importantes En présence de l...

Page 27: ...e ou au châssis Borne au potentiel de la terre Equipotentialité N Conducteur neutre sur un équipement installé à demeure L Conducteur de phase sur un équipement installé à demeure Alimentation en marche Alimentation à l arrêt Alimentation en mode veille Lorsque l interrupteur est en mode veille l unité n est pas complètement déconnectée de l alimentation secteur Position Marche d un interrupteur p...

Page 28: ...cution Ne pas appliquer ou enlever sur des conducteurs SOUS TENSION DANGEREUSE Application ou retrait autorisés sur les conducteurs SOUS TENSION DANGEREUSE Attention surface chaude Rayonnement ionisant Table 2 Description des Symboles de Sécurité qui pourraient apparaître sur le produit Sheet 2 of 2 Symboles Description ...

Page 29: ...ristic shown in Figure 13 DC to 50 MHz 3 dB Typical characteristic shown in Figure 18 DC to 100 MHz 3 dB Typical characteristic shown in Figure 23 Rise Time 175 ns or less 35 ns or less 7 ns or less 3 5 ns or less Maximum Current continuous rms 500 Arms Derating according to frequency shown in Figure 9 150 Arms Derating according to frequency shown in Figure 14 30 Arms Derating according to freque...

Page 30: ...ximum of 150 mA Equivalent to a maximum of 20 mA Equivalent to a maximum of 5 mA Maximum rated power with rated current 7 2 VA 5 5 VA 5 6 VA 5 3 VA Lowest Measurable Current a at 3 accuracy of DC current with the oscilloscope set to 1 mV div and high resolution mode on 20 mA 5 mA Rated Supply Voltage DC 12V 0 5V DC 12V 1 V DC 12V 0 5 V DC 12V 0 5V a Oscilloscope set to 1 mV div and 20 MHz or 25 MH...

Page 31: ...t Depth 27 mm 1 06 55 mm 2 17 18 mm 0 71 Weight Approximate 520 g 18 3 oz 500 g 17 6 oz 230 g 8 1 oz 240 g 8 5 oz Table 6 Environmental Specifications Sheet 1 of 2 Item Specification Operating temperature and humidity range 0 o C to 40 o C 32 o F to 104 o F 80 rh or less no condensation Storage temperature and humidity range 10 o C to 50 o C 14 o F to 122 o F 80 rh or less no condensation Bearable...

Page 32: ...cs N2780B Plots Figure 8 Frequency Response Characteristic N2780B Pollution degree Pollution degree 2 For indoor use only Measurable conductors Insulated conductor Table 6 Environmental Specifications Sheet 2 of 2 Item Specification Frequency Hz Amplitude 0dB 1V ...

Page 33: ...acteristics N2780 1 2 3B User s Guide 33 Figure 9 Derating According to Frequency N2780B Continuous Maximum Input Figure 10 Insertion Impedance N2780B Frequency Hz Maximum input current Arms Frequency Hz Insertion impedance Ω ...

Page 34: ... DC Accuracy Characteristic N2780B Figure 12 AC Amplitude Accuracy Characteristic N2780B 5 4 3 2 1 0 1 2 3 4 5 0 1 1 10 100 1000 DC Current A Deviation upper limit lower limit N2780A 5 4 3 2 1 0 1 2 3 4 5 0 1 1 10 100 1000 AC Current Deviation upper limit lower limit N2780A ...

Page 35: ...N2780 1 2 3B User s Guide 35 N2781B Plots Figure 13 Frequency Response Characteristic N2781B Figure 14 Derating According to Frequency N2781B Continuous Maximum Input Frequency Hz Amplitude 0dB 1V Frequency Hz Maximum input current Arms ...

Page 36: ...fications and Characteristics Figure 15 Insertion Impedance N2781B Figure 16 DC Accuracy Characteristic N2781B Frequency Hz Insertion impedance Ω 5 0 5 10 15 20 25 0 1 1 10 100 1000 DC Current A Deviation upper limit lower limit N2781A ...

Page 37: ...ser s Guide 37 Figure 17 AC Amplitude Accuracy Characteristic N2781B N2782B Plots Figure 18 Frequency Response Characteristic N2782B 5 0 5 10 15 20 25 0 1 1 10 100 1000 AC Current Deviation upper limit lower limit N2781A Frequency Hz Amplitude 0dB 1V ...

Page 38: ...uide Specifications and Characteristics Figure 19 Derating According to Frequency N2782B Continuous Maximum Input Figure 20 Insertion Impedance N2782B Frequency Hz Maximum input current Arms Frequency Hz Insertion impedance Ω ...

Page 39: ...C Accuracy Characteristic N2782B Figure 22 AC Amplitude Accuracy Characteristic N2782B 5 0 5 10 15 20 25 0 001 0 01 0 1 1 10 100 DC Current A Deviation upper limit lower limit N2782A 5 0 5 10 15 20 25 0 001 0 01 0 1 1 10 100 AC Current Deviation upper limit lower limit N2782A ...

Page 40: ...ications and Characteristics N2783B Plots Figure 23 Frequency Response Characteristic N2783B Figure 24 Derating According to Frequency N2783B Continuous Maximum Input Frequency Hz Amplitude 0dB 1V Frequency Hz Maximum input current Arms ...

Page 41: ... 1 2 3B User s Guide 41 Figure 25 Insertion Impedance N2783B Figure 26 DC Accuracy Characteristic N2783B Frequency Hz Insertion impedance Ω 20 15 10 5 0 5 10 15 20 0 001 0 01 0 1 1 10 100 DC Current A Deviation upper limit lower limit N2783A ...

Page 42: ...N2780 1 2 3B User s Guide Specifications and Characteristics Figure 27 AC Amplitude Accuracy Characteristic N2783B 6 3 0 3 6 9 12 0 001 0 01 0 1 1 10 100 AC Current Deviation upper limit lower limit N2783A ...

Page 43: ... Equipment Description Critical Specifications Recommended Probe Power Supply No substitute Keysight N2779A Digital Multimeter DMM AC DC voltage and current measurement accuracy better than 0 1 of reading at 10 mA Input resistance in AC DC voltage mode 1 MΩ Keysight 34401A Signal Generator DC to 66 Hz sine waves able to generate more than 10A in the test coil e g an inductive load Keysight 6813B A...

Page 44: ...as shown in Figure 28 Warm up all instruments for 30 minutes before starting the test procedure While the test system is warming up clean the magnetic contacts on the probe jaw Figure 28 Test Setup Shown with N2782B 2 Press the DEMAG button on the probe terminator 3 Configure the DMM to measure AC Volts ...

Page 45: ...the DMM measure the voltage output of the probe and record this value as the DMM Voltage Table 8 7 Calculate the current by multiplying the DMM Voltage by the value in the Multiplier column Record the result in the Calculated Amperes column 8 Compare the Calculated Amperes to the Passing Range values to determine if the probe passes the test Table 8 Test Results Model Number DMM Voltage Multiplier...

Page 46: ...le MYXXXXXXXX Description of failure or service required NOTE Include probing and browsing heads if you feel the probe is not meeting performance specifications or a yearly calibration is requested 3 Protect the probe by wrapping in plastic or heavy paper 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 contai...

Page 47: ... M maximum current 29 measurements 11 N N2779A power supply 3 11 and oscillation 19 N2780 1B probes 5 N2780B plots 32 N2781B plots 35 N2782B plots 37 N2783B plots 40 O opening lever 18 N2780 1B 6 N2782 3B 9 oscilloscope connection 12 P performance verification 43 power supply cable 6 9 probe inspecting 4 service 46 probing safety 14 R returning for service 46 rise time 29 S safe probing 14 safety ...

Page 48: ...Printed in Malaysia Part Number N2780 97008 N2780 97008 ...

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