751552 CLAMP-ON PROBE User`s Manual - Electro
Contents
1. 032 Instrument with double insulation or reinforced insulation between primary secondary and outer case parts Operating voltage 600 V Measurement category Ill Pollution degree 2t Operating voltage 300 V Measurement category IV Pollution degree 2t Electromagnetic compatibility Complying standard EN61326 Emissions Class B Immunity Annex A industrial locations Current Range AC 0 001 to 1200 Arms However for 1000 to 1200 Arms refer to the Maximum Current Current Transformation Ratio 1000 1 Output Signal AC 1 mA A or 1 A 1000 A Accuracy and Phase shift at Reference Conditions Primary Current I 1 lt 1 lt 100mA 01sI1 lt 1A 1s1 lt 10A 10s51 lt 100A 100 lt 1 lt 1200A accuracy of output signal s3 o0frdg 5yA lt 2 ofrdg 3ypA s1 ofrdg lt 0 5 o0frdg lt 0 3 of rdg rdg reading of output signal Phase shift Not specified Not specified s 2 deg s1 deg s 0 7 deg External Dimensions Units mm Bandwidth Crest Factor Maximum Current 30 Hz to 5 kHz error in frequency influence is added to Accuracy at Reference Conditions 6 or less for a 2000 A peak 333 Arms current or less For a continuous frequency f of 1 kHz or less lt 1000 A For frequencies exceeding 1 kHz the current that can be allowed to flow continuously Ipermanent is calculated as follows 1000A f kHz For an input signal of 1000 A lt I lt 1200 A at 1 kHz the probe can be used continuously for a maximum of 40 minutes Do n2. information for the proper operation of the instrument Y Clamp lever Do not exceed the maximum current Doing so can result in erroneous measurement or damage to the instrument e Beware of electric shock Do not exceed 600 V and do not use with a non isolated conductor with a surge exceeding measurement category Ill Be sure to check the electric potential and voltage surge before measurement Do not perform measurement if the instrument is damaged Always use the instrument indoors Do not use the instrument in a rainy or humid environment or if water droplets form on its surface Also do not operate with wet hands Condensation may appear if sudden changes in temperature occur If this happens let the device acclimatize to the new temperatures for at least one hour then refrain from using the device until confirming that there is no condensation Always operate the instrument in the environmental conditions described in this manual Always keep the clamp lever clean e Do not disassemble the device The device should be disassembled by qualified personnel only Names of Parts Opens and closes Direction of current Jaws flowing through conductor Correct Use of Clamp Direction of current flow Feed through hole for conductor Incorrect Use of Clamp Using an Earth Shielded Conductor Name plate Using Two Parallel Conductors The direction of current flow from the output terminal
3. 8921 sold separately Length 0 75 m Rated Current 32 A External magnetic field lt 40 A m Load impedance lt 1 Q s 1 VA 111 0 Fork 758921 1 2 pes per unit Terminal For measuring leads model Adapter 758917 sold separately Set Rated Current 25 A 758921 Maintenance Note the following when cleaning the probe Do not clean the probe while clamped to a conductor Likewise do not clean while connected to a measuring instrument Do not allow water to contact the jaws When opening the jaws keep the exposed metal areas clean If dust accumulates wipe with a clean dry cloth To prevent rust wipe metal surfaces with oil from time to time Avoid getting oil on non metallic surfaces Use only high quality low viscosity machine oil such as sewing machine oil This product undergoes a 100 inspection at the time of shipment If any layers of the core come apart slightly during shipment this will not affect the functioning of the product Four metal surfaces are exposed with the clamp is opened Metal surfaces 6 Servicing If you encounter any problems during use or if the device does not appear to be operating n ormally contact your dealer or nearest YOKOGAWA representative IM 751552 01E 3rd Edition
4. Output terminals 4 mm socket 3 Performing Measurement CAUTION Ensure that the current flowing through the conductor being measured is within the current range If the current range is exceeded the device may overheat and become damaged es Operating Procedure 1 2 Enter the appropriate settings on the measuring instrument being used to accommodate the output from the probe Connect measuring leads 758917 sold separately to the probe s output terminals and the measuring instrument The connection method differs depending on the measuring instrument being used See your instrument s user s manual for the procedure If the connector on the measuring leads cannot be connected to the input terminals on the measuring instrument use a fork terminal 758921 sold separately or other adapter Example Fora digital power meter connect a lead from the red output terminal to the current input terminal and from the black output terminal to the current terminal For a digital multimeter connect a lead from the red output terminal to the A terminal and from the black output terminal to the Lo terminal Squeeze the jaws to open the clamps then position the conductor inside the feed through hole Hold the probe so that the conductor is as closely in the center of the feed through hole as possible Release the clamp lever to close the clamps Steps 3 and 4 is called clamping Read the measured values on the meas
5. User s Manual 751552 CLAMP ON PROBE Thank you for purchasing the CLAMP ON PROBE Model 751552 In order to take advantage of all the functions of the probe and to ensure proper use please read this user s manual thoroughly before beginning operation Please familiarize yourself with the functions and characteristics of the probe prior to operation 3rd Edition June 2004 YK All Rights Reserved Copyright 2002 Yokogawa Electric Corporation YOKOGAWA IM 751552 01E 3rd Edition 1 Safety Precautions The following safety markings are used in this manual A This instrument is protected by double layer insulation or reinforced insulation that has the same level of protection as double layer insulation It is not necessary to connect the instrument to protective ground for safe use Improper handling or use can lead to injury to the user or damage to the instrument This symbol appears on the instrument to indicate that the user must refer to the user s manual for special instructions The same symbol appears in the corresponding place in the user s manual to identify those instructions In the manual the symbol is used in conjunction with the word WARNING or CAUTION Describes precautions that should be observed to prevent serious injury or death to the user CAUTION Describes precautions that should be observed to prevent minor or moderate injury or damage to the instrument Note Provides important
6. W Approx 111 W x 216 H x 45 D mm Influence of Crest Factor Influence of Humidity Operating Altitude Max Jaws Opening External Dimensions Weight Approx 620g Output Safety jacks 4 mm Measurement category describes a number which defines a transient overvoltage condition It implies the regulation for impulse withstand voltage Measurement category III applies to measurement of the distribution level that is building wiring fixed installations Measurement category IV applies to measurement of the primary supply level that is overhead lines cable systems and so on Pollution degree describes the degree to which a solid liquid or gas which deteriorates dielectric strength or surface resistivity is adhering Pollution Degree 2 applies to the normal indoor atmosphere Normally only non conductive pollution occures Occasionally however temporary conductivity caused by condensation must be expected Reference Conditions Temperature 23 C 3 C Humidity 20 to 75 RH No AC magnetic field Conductor centered in jaws No influence of current flowing in adjacent conductors When the primary current is sinusoidal the sinusoidal conditions are frequency 48 to 65 Hz distortion factor lt 1 no DC component There is no frequency influence in the range 48 Hz lt f lt 65 Hz Accessories Sold Separately Name Model Lot Qty Notes Measuring 758917 1 2 pes per unit Lead Used in conjunction with the adapter model 75
7. ot perform measurements 20 minutes thereafter 1 Qorless Ipermanent Load Impedance Max Output Voltage 30 V peak or less restricted by the output protection circuit Working Voltage Max 600 Vrms Influence of Adjacent Conductor When the frequency of the current in an adjacent conductor is 50 Hz the influence on the primary current is 0 5 mA A or less Influence of Conductor Position inthe Jaws 0 1 or less in the output signal for a frequency of 400 Hz or less Influence of Load Impedance r When 1 Q lt r lt 5 Q under 0 1 of output signal and phase shift under 0 2 degrees Influence of Frequency fS 30 Hz lt f lt 48 Hz under 0 5 of output signal 65 Hz lt f lt 1 kHz under 1 of output signal 1 kHz lt f lt 5 kHz under 2 of output signal Under 1 of output signal given a crest factor of 6 or less for a 2000 A peak 333 Arms current or less Influence of DC Current Superimposed on Nominal Current Under 1 of the output signal assuming a current of DC 15 A or less Operating Temperature 10 C to 50 C Storage Temperature 40 C to 70 C Temperature Influence 0 02 C or less of the output signal Operating Humidity 0 to 90 RH no condensation However if 35 C is exceeded humidity will impair the primary functionality by a factor of 0 5 RH C Under 0 1 of the output signal given 10 RH lt Humidity lt 20 RH or 75 RH lt Humidity lt 90 RH 2000 m or less above sea level 53 mm open jaws height 139 mm
8. uring instrument Calculate the current flowing through the conductor using an input output ratio of 1000 1 Example Given that 150 0 mA is flowing from the probe s output terminal current 150 0 mA x 1000 150 0 A Note Close the clamp completely before taking measurements Errors can occur If any foreign objects or particles become trapped between the jaws Only perform measurements on conductors in which the current is flowing in only one direction The device cannot correctly measure earth shielded conductors or parallel conductors with current flowing in both directions To reduce errors use a measuring instrument with an internal impedance less than or equal to 12 If DC current is superimposed on an AC current being measured the output signal from the clamp will become distorted and measurements will be inaccurate When measuring phase difference in voltage and current using an instrument such as a digital power meter make sure that the current flows in the same direction as the arrows on the probe The phase difference can be correctly measured by positioning the clamp so that current flows from the front side name plate to the reverse side in the direction shown by the arrows on the jaws Avoid locations with extremely strong external magnetic fields other than the conductor under test as they may cause measurement errors 4 Specifications Safety Standards Complying starndard EN61010 1 amp EN61010 2
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