Chapter 1 701930 Current Probe
Contents
1. s o o a E 001 Q 0 001 10k 100k 1M 10M Frequency Hz Figure 3 Insertion Impedance Typical Characteristics 1 10 IM 701930 01E Chapter 2 Malfunction First Investigate Corrective Action to be Taken in Case of an Abnormality If maintenance service is required or if the instrument still does not operate properly even after proper corrective action has been taken contact your nearest YOKOGAWA representatives listed on the back cover of this manual Symptom Possible Cause Corrective Action Power is not turned ON Turn ON the power Cannot make DC measurements or at low frequencies up to few hundred Hertz or the amplitude is small in the given frequency region Cannot adjust to the zero level using the zero adjustment dial The amplitude is small across all frequencies The measurement instrument Such as an oscilloscope is set to AC coupling The sensor is not locked itis not hooked securely The sensor is magnetized The input impedance of the measurement instrument Such as an oscilloscope is set to 50Q Set the instrument to DC coupling Lock the sensor Demagnetize the sensor before adjusting the zero level Set it to 1MQ IM 701930 01E ejeBnseAu 3s114 uonounjieiw Hg2. 700938 and 701934 provided that the connector and pin assignments match and that voltage and other electrical specifications are satisfied Regardless of which power supply is used for safety make sure that it has a protective earthing with double insulation construction Make sure that the waveform measuring equipment connected to this unit s output terminal BNC is equipped with a power supply having a protective earthing with double insulation construction If the waveform measuring instrument which is connected to this unit s output terminal BNC is equipped with any other input terminal take the following precautions to ensure that the other instrument does not form a bridge between the probe and any hazardous live parts 1 Isolate the terminal to which the probe is connected from other terminals on the measuring instrument using basic insulation conforming to the overvoltage category working voltage and pollution degree requirements of the circuit being tested 2 f basic insulation requirements cannot be met between the terminal to which this unit is connected and other terminals of the measuring instrument make sure that the voltage input to the measurement terminal does not exceed the safe voltage level SELV E 3 Make sure to ground the measuring instrument 4 Beware of electric shock when connecting the probe to the item being measured Do not remove the probe from the instrument while the probe is connected to the it
3. clamp lever 1 Check that the system is safe and that the preparations described in the preceding section have been carried out 2 Pull the sensor opening lever so that the sensor head opens 3 Align the sensor so that the current direction indication corresponds to the direction of current flow through the conductor to be measured and clamp so that the conductor is in the center of the sensor aperture 1 7 9qoJd JUSIIND 0 6 107 B 4 Press the clamp lever on the sensor head until the LOCK indicator appears and the UNLOCK indication disappears and check that the opening lever is firmly locked and the clamp is securely closed 5 It is now possible to monitor the current waveform The output voltage rate of the 701930 is 0 01 V A Convert the voltage sensitivity of the waveform observation instrument to current sensitivity For example if the voltage sensitivity is 10 mV DIV the current sensitivity is 1 A DIV Note The output of this unit is terminated internally Use a waveform measurement instrument with an input impedance of at least 1 MQ 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 be aware that the offset voltage drifts depending on factors such as the ambient temperature Under certain circumsta
4. section of the sensor closed except when clamping it onto the conductor to be measured The facing surface of the core section can be scratched while it is open u ay Note Accurate measurement may be impossible in locations subject to strong external magnetic fields such as near transformers and high current conductors or in locations subject to strong external electric fields such as near radio transmission equipment IM 701930 01E V IM 701930 01E Contents Foreword egsogion d o Oo ege nia IRR BE ERROR i Checking the Contents of the Package ssssssssseeeeeneneeneenneen nnne nnne ii Safety Precautions 2 apr EE a a aa MAS a A iii Chapter 1 701930 Current Probe Product Overview sasmreti e a eL irte i Pe Co E Erb eve Cc E Names of Parts noe er HEU Hi AUR Eee eren ele ie esed Uude Description of Parts oreet tret net eh ten ta eere dette reote te a retos MER MC 2 Clamp Lever 3 Clamp Lock id nee ee PE C e ee ree d ve ti P 4 Sensor Head ACIE amendatory 6 Demagnetizing Switch DEMAG seeeennem enne 1 3 7 Zero Adjustment Dial ZERO ADJ sesseeeeem een 1 3 8 Output Connector iss iiss a rare am db RE deis athe 1 3 9 oce 1 3 Measurement Procedure sessesseeseeeeennnene nennen nennen nennen nennen rennen 1 4 Notes on Use eo rag beads T ROM eee 1 4 Prepara
5. the clamp is open or measurement is being performed do not apply the clamp to any bare conductors When applying the clamp or taking measurements don t touch the clamp anywhere from the edge of the barrier up to the conductor being measured Becareful not to damage the insulation surface while taking measurements This instrument is made for use with the Power Supply Model 700938 or 701934 It is possible to use a power supply other than the 700938 or 701934 provided that the connector and pin assignments match and that voltage and other electrical specifications are satisfied Regardless of which power supply is used for safety make sure that it has a protective earthing with double insulation construction Make sure that the waveform measuring equipment connected to this unit s output terminal BNC is equipped with a power supply having a protective earthing with double insulation construction fthe waveform measuring instrument connected to this unit s output terminal BNC is equipped with any other input terminal take the following precautions to ensure that the other instrument does not form a bridge between the probe and any hazardous live parts 1 Isolate the terminal to which the probe is connected from other terminals on the measuring instrument using basic insulation conforming to the overvoltage category working voltage and pollution degree requirements of the circuit being tested 2 f basic insulation requir
6. 0 Hz 400 A m magnetic field Maximum Ratings Voltage Between Ground 600 V CATII 300 V CATIII insulated conductor Diameter of Measurable Conductors p 20 mm Recommended Calibration Period 6 months Cable Lengths Sensor Cable Approx 2 m 78 7 Power Supply Cable Approx 1 m 39 4 External Dimensions Sensor Approx 176 W x 69 H x 27 D mm Approx 6 93 W x 2 72 H x 1 06 D Terminator Approx 27 W x 55 H x 18 D mm Approx 1 06 W x 2 17 H x 0 71 D Mass Approx 500 g Approx 17 6 oz Accessories Instruction manual carrying case In conjunction with a waveform measuring instrument with an input impedance of 1 MW zx 196 IM 701930 01E 1 9 Applicable Standards Safety EN61010 2 032 Type B Measurement category Il III anticipated transient overvoltage 4000 V pollution degree 2 EMC EN61326 1V Amplitude dB OdB lk 10k 100k 1M 10M 100M Frequency Hz Figure 1 Frequency Characteristics Typical Characteristics 200 Maximum input current Arms o o 10 100 1k 10k 100k 1M 10M Frequency Hz Figure 2 Derating According to Frequency 1 E lt S 8 9 01
7. User s Manual 701930 Current Probe YOKOGAWA IM 701930 01E 2nd Edition Yokogawa Electric Corporation Foreword Revisions Disk No OE12 2nd Edition November 2005 YK Thank you for purchasing the Current Probe Model 701930 This instruction manual contains useful information about the instrument s functions and operating procedures as well as precautions that should be observed during use To ensure proper use of the instrument please read this manual thoroughly before beginning operation After reading the manual keep it in a convenient location for quick reference whenever a question arises during operation 1st Edition June 2001 2nd Edition November 2005 All Rights Reserved Copyright 2001 Yokogawa Electric Corporation IM 701930 01E The following symbols are used in this manual to alert you to important information instrument and the operator must refer to the User s Manual The symbol is used in the User s Manual to indicate the reference EZ Describes precautions that should be observed to prevent serious injury or death to the user i Affixed to the instrument Indicates danger to personnel or CAUTION Describes precautions that should be observed to prevent minor or moderate injury or damage to the instrument Note Provides important information for the proper operation of the instrument Checking the Contents of the Package If the wrong instrument or accessories have been del
8. ctor see figure below 600 Fo AC E S0Hz 500 DC 400 300 200 Current Consumption mA 0 50 100 150 Current to be measured A Current consumption vs current to be measured typical The sum total of a positive and negative current consumption 1 Have the Power Supply Model 700938 or 701934 and oscilloscope or recorder for waveform measurement ready 2 Turn the power switch OFF and connect the power cord 3 Connect the power plug of the 701930 to the power receptacle of the 700938 or 701934 4 Turn the 700938 or 701934 power switch ON and check that the front panel power indicator lights Note n The output of this unit is terminated internally Use a high impedance input to the measuring instrument With an input impedance of 50 Q accurate measurement is not possible When power is supplied to the 701930 a demagnetizing waveform might be generated IM 701930 01E 1 5 9qo4d JUSIIND 06107 B AN Demagnetizing and Zero Adjustment CAUTION When disconnecting the output connector be sure to release the lock before pulling the connector Forcibly pulling the connector without releasing the lock or pulling on the cable will result in damage to the terminator If using BNC banana plug or similar adapters to connect to input terminals other than BNC connectors make sure the polarity is correct Do not demagnetize when the clamp is connecte
9. d to a conductor Doing so might damage the components of the circuit being measured Do not begin supplying power to the 701930 after the clamp has been connected to a conductor Doing so might damage the components of the circuit being measured With the waveform measurement instrument input at ground adjust the trace to the zero position Set the input coupling of the waveform measurement instrument to DC Connect the output connector of the 701930 to the input connector of the waveform measurement instrument Turn the clamp lever until it clicks and check that it is locked securely Without clamping the conductor to be measured press the clamp lever until the LOCK indication appears and the UNLOCK indication disappears and then check that the clamp is properly closed Press the demagnetizing switch DEMAG on the terminator Turn the zero adjustment dial on the terminator to adjust the trace to the zero position Note The output of this unit is terminated internally Use a high impedance input to the measuring instrument With an input impedance of 50 Q accurate measurement is not possible IM 701930 01E AN Measurement Procedure CAUTION The maximum continuous input range is based on heat that is internally generated during measurement Never input current in excess of this level Doing so may result in damage to the probe The maximum continuous input range varies according to the fre
10. em 5 Before connecting the probe check that the measuring instrument and power supply are properly grounded and that the output connector and power plug are connected to the BNC connector and power receptacle respectively 6 Read and observe all warnings and precautions relating to electrical safety for the measuring instrument being connected to the probe Refer to the following standards regarding the meanings of underlined terms IEC61010 1 IEC61010 2 031 IEC61010 2 032 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 exceed the following levels 30 Vrms 42 4 Vpeak and 60 VDC IM 701930 01E Preparations for Measurement N CAUTION Before turning ON the power make sure that the voltage of the power supply being used matches the supply voltage indicated on the rear panel of the 700938 or 701934 When using the Current Probe Model 701930 you can only connect as many active probes simultaneously to the Power Supply Model 700938 or 701934 or the DL Series rear panel probe power supply connector as allowed depending on the current value of the conductor The current consumption of the Current Probe Model 701930 is dependent upon the measured current value Do not let each active probe s total current consumption exceed the current regulated by the Power Supply Model 700938 or the DL Series rear panel probe power supply conne
11. ements cannot be met between the terminal to which this unit is connected and other terminals of the measuring instrument make sure that the voltage input to the measurement terminal does not exceed the safe voltage level SELV E 3 Make sure to ground the measuring instrument 4 Beware of electric shock when connecting the probe to the item being measured Do not remove the probe from the instrument while the probe is connected to the item 5 Before connecting the probe check that the measuring instrument and power supply are properly grounded and that the output connector and power plug are connected to the BNC connector and power receptacle respectively 6 Read and observe all warnings and precautions relating to electrical safety for the measuring instrument being connected to the probe Refer to the following standards regarding the meanings of underlined terms IEC61010 1 IEC61010 2 031 IEC61010 2 032 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 exceed the following levels 30 Vrms 42 4 Vpeak and 60 VDC IM 701930 01E CAUTION Do not subject the unit to vibrations or shocks during transport or handling Be especially careful to avoid dropping the unit Do not store or operate the unit where it will be exposed to direct sunlight high temperature high humidity or condensation If exposed to such conditions the
12. impedance of 1 MQ Connect to the BNC input connector of the waveform measuring instrument Note The output of this unit is terminated internally Use a high impedance input to the measuring instrument With an input impedance of 50 Q accurate measurement is not possible f using BNC banana plug or similar adapters to connect to input terminals other than BNC connectors make sure the polarity is correct Turn the clamp lever until it clicks and check that it is locked securely 9 Power Plug Connect the power plug to the receptacle on the Power Supply Model 70938 or 701934 to supply power to the sensor and terminator IM 701930 01E 1 3 9qoJd JUSIIND 0 6 107 B Measurement Procedure A Notes on Use To avoid short circuits and accidents that could result in injury or death use this current probe only with power lines carrying 600 V or less CATII or 300 V or less CATIII Also to avoid short circuits and personal injury when the clamp is open or measurement is being performed do not apply the clamp to any bare conductors When applying the clamping or taking measurements don t touch the clamp anywhere from the edge of the barrier up to the conductor being measured Be careful not to damage the insulation surface of the conductor being measured while taking measurements This instrument is made for use with the Power Supply Model 700938 or 701934 It is possible to use a power supply other than the
13. ing and closing the clamp Make sure to open or close the clamp only by using the clamp lever 3 Clamp Lock Locks the clamp in place when it is closed 4 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 and therefore great care should be exercised in handling it 5 Barrier A piece which indicates the limit up to which the user may safely touch the clamp and reduces the danger of touching the conductor during testing Do not touch any part of the clamp beyond the barrier during measurement 6 Demagnetizing Switch DEMAG If the core has been magnetized by switching the power ON and OFF or by an excessive input this switch demagnetizes it Always carry out demagnetizing before measurement The demagnetizing process takes about three seconds During demagnetizing a demagnetizing waveform is output 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 unit When performing measurements always carry out a zero adjustment after demagnetizing 8 Output Connector The current waveform of the measured conductor is output at a constant rate 0 01 VA in conjunction with the waveform measuring instrument with an input
14. ivered or if some accessories are missing or defective contact the dealer from which you purchased them Current Probe Model 701930 Main Body Accessories One user s manual this document Carrying case IM 701930 01E Safety Precautions This probe meets the Measurement Category II and III and Pollution Degree 2 requirements as given in the IEC 61010 1 standards The following general safety precautions must be observed during all phases of operation service and repair of this instrument If this instrument is used in a manner not specified in this manual the protection provided by this instrument may be impaired Also Yokogawa Electric Corporation assumes no liability for the customer s failure to comply with these requirements The following symbols are used on this instrument AN To avoid injury death of personnel or damage to the instrument the operator must refer to an explanation in the User s Manual or Service Manual Both direct and alternating current Do not apply around or remove from HAZARDOUS LIVE conductors 2 IM 701930 01E Precautions In order 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 this current probe only with power lines carrying 600 V or less CATII or 300 V or less CATIII Also to avoid short circuits and personal injury when
15. nces oscillation may occur if the probe is connected to the Power Supply Model 700938 or 701934 while the power supply is ON In such cases oscillation can be stopped and operation restored to normal by opening and closing the clamp with the clamp lever Depending on the measured current value or its frequency resonant sounds may be generated from the clamp Unless there is dirt or foreign matter on the matching surfaces of the sensor head this will have no effect on measurement The reading may be affected by the position within the clamp aperture of the conductor being measured The conductor should be in the center of the clamp aperture When carrying out measurement press the clamp lever until the LOCK indication appears and the UNLOCK indication disappears and check that the clamp is properly closed If the clamp is not properly closed accurate measurement will not be possible 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 appropriate H Power source Load Directly after powering ON the demagnetizing waveform appears in the output this is not a malfunction 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 ex
16. quency of the current being measured See page1 9 Product Specifications f 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 time to cool before resuming operation f you continuously input a current even if it is below the maximum current value established by the maximum continuous input range the self heating of the sensor may cause the safety function of the instrument to activate in order to prevent damage to the instrument Athigh 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 The probe is rated for maximum input under two conditions in addition to the input maximums shown in the Product Specifications These are 1 300 Apeak for non continuous input and 2 500 Apeak at Pulse Width lt 30 us 1 indicates an upper waveform response limit of 300 Apeak Use the sensor at RMS current input levels that are within the rated continuous maximums 2 indicates the upper response limit for a single input pulse Use the sensor at levels not exceeding this value Open the clamp only by using
17. ternal electric fields such as radio transmission equipment IM 701930 01E Specifications Product Specifications Accuracy is guaranteed at 23 3 C 73 F 5 F after the power has been on for 30 minutes Band width DC to 10 MHz 3 dB Typical characteristics shown in Page1 10 Fig 1 Rise Time 35 ns or less Maximum Continuous Input Range 150 A Derating according to frequency shown in Page1 10 Fig 2 9qoJd JUSIIND 0 6 107 B Maximum Peak Current Value Non Continuous 300 Apeak or 500 Apeak at Pulse Width lt 30 us Output Voltage Rate 0 01 V A Amplitude Accuracy To 150 A 1 rdg 1 mV 150 A to 300 Apeak 2 rdg DC and 45 to 66 Hz Noise Equivalent to 25 mArms or less for 20 MHz band measuring instrument Insertion Impedance Typical characteristics shown in Page 1 10 Fig 3 Temperature Coefficient for Sensitivity 2 or less within a range of 0 to 40 C or 32 to 104 F when inputting 55 Hz 150 A Maximum Rated Power 5 5 VAmax at the maximum continuous input range Rated Supply Voltage x12V 41V Operating Temperature and Humidity Range 0 to 40 C 32 to 104 F 80 RH or less no condensation Storage Temperature and Humidity Range 10 to 50 C 14 to 122 F 80 RH or less no condensation Location for Use Indoor altitude up to 2000 m 6562 feet Effect of External Magnetic Fields Equivalent to a maximum of 150 mA in a DC or 6
18. tions for Measurement ssssseee emen 1 5 Demagnetizing and Zero Adjustment esse 1 6 Measurement Procedure eseesseesseeeeenee eene enne nnne nnns 1 7 SpeGifications 52a ge cete e ete att Re ie c rb lu ec etis 1 9 Product Specifications m one ee i Eee e ea 1 9 Applicable Standards sssssssseseseeeenenen nennen enne 1 10 Chapter 2 Malfunction First Investigate Corrective Action to be Taken in Case of an Abnormality eeeeee 2 1 IM 701930 01E vii Chapter 1 701930 Current Probe Product Overview Features This unit can be directly connected to a BNC input connector of a waveform measuring instrument such as a digital oscilloscope or a DL Series instrument and by clamping it to a conductor to be measured allows the current waveform to be easily captured Highly accurate current detection Easy current measurement Wideband frequency characteristics DC to 10 MHz Wide clamp permits measurement of high current levels Easy protect function during excessive input IM 701930 01E 9qoJd JUSIIND 0 6 107 B Names of Parts Terminator Current Direction Indication oroc Co qup Bus 1 Power Supply Cable TI 7 Sensor Cable IM 701930 01E Description of Parts 1 Clamp The part which clamps to the conductor to be measured 2 Clamp Lever The lever for open
19. unit may become 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 it was not damaged due to poor storage or transport conditions If damage is found contact your dealer or YOKOGAWA representative This instrument is not waterproof or dustproof Do not use the unit in a wet or dusty environment 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 If there is any type of dust or dirt on the matching surfaces of the sensor head measurements may be affected Wipe it away gently with a soft cloth In order to avoid damaging the sensor cables do not bend or pull the sensor cable or power supply cable 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 benzene alcohol acetone ether ketones thinners or gasoline They may cause discoloration or damage When the power is ON keep the core
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