User`s Manual
Contents
1. CL120 Clamp on Tester User s Manual IM CL120 eee Contents E Precautions for Safety Use of the Instrument 1 Instrument Layout 2 Measurement 2 1 Preparation for Measurement 2 2 AC Current Measurement 3 Other Functions 3 1 Auto Power Off Function 3 2 Data Hold Function 3 3 Optional Accessories 4 Battery Replacement 5 Specifications 6 Calibration and After sales Service IM CL120 2nd Edition June 2003 MC YOKOGAWA Yokogawa M amp C Corporation E Precautions for Safe Use of the Instrument When handling the instrument ALWAYS observe all of the cautionary notes on safety given below Yokogawa M amp C Corporation is not at all liable for damage resulting from misuse of this product by the user that is contrary to these cautionary notes Various symbols are used on the instrument and in this manual to ensure the product is used safety and to protect operators and prop erty from possible hazards or damage The following safety symbols are used where appropriate Read the explanations carefully and familiarize yourself with the symbols before reading the text The instrument and this manual use the following safety symbols Danger Handle with Care A This symbol indicates that the operator must refer to an ex planation in the User s Manual in order to avoid the risk of personal injury or death and or damage to the instrument 0 Double Insulation This symbol indicates double insulation m2. For the detailed specification refer to the Clamp Adapter User s Manual 4 Battery Replacement A WARNING T To avoid electric shock hazard never try to replace batteries during measurement A CAUTION e Do not mix new and old batteries e Make sure to install battery in correct polarity as indicated in bat tery compartment If the battery voltage becomes too low for the instrument to operate normally CZJ is shown on the display Then replace the battery Note that when the battery is completely exhausted the display blanks without shown 1 Set the Range Switch to the OFF position 2 Press in the hole on the battery compartment cover with the tip of a pointed object then slide open the cover 3 Replace the battery observing correct polarity Use two new LR44 or SR44 batteries 4 Slide the battery compartment cover back in place Battery compartment cover 5 Specifications instrument Specifications e Measuring Ranges and Accuracy at 23 5 C relative humidity up to 75 AC Current Measuring 20A 0 to 19 99A 2 0 rdg 7dgt 50 to 1kHz 2 0 rdg 5dgt 50 60Hz ae Ores 3 0 rdg 10dgt 40Hz to 1kHz E General Specifications Operating System Dual integration Measurement Function AC current Display Liquid crystal display with maximum counts of 1999 Overrange Indication 1 flashes on the highest digit Response Time Approx 2 second Sample Rate Approx 2 5 time
3. AC Voltage Current This symbol indicates AC voltage or current Ground This symbol indicates ground earth A WARNING Indicates that there is a possibility of serious personal injury or loss of life if the operating procedure is not followed correctly and describes the precautions for avoiding such injury or loss of life A CAUTION Indicates that there is a possibility of serious personal injury of dam age to the instrument if the operating procedure is not followed cor rectly and describes the precautions for avoiding such injury or dam age NOTE Draws attention to information essential for understanding the opera tion and features A WARNING e Never make measurement on a circuit above 300V AC e Do not use the instrument in an atmosphere where any flammable or explosive gas is present e The transformer jaws are made of metal and their tips are not insulated Be especially careful about the hazard of possible shorting where the equipment under test has exposed metal parts e Avoid using the instrument if it has been exposed to rain or mois ture or if your hands are wet e Do not exceed the maximum allowable input of any measurement range e Never open the battery compartment cover when making meas urement e Do not use the instrument if there is any damage to the casing or when the casing is removed e Do not install substitute parts or make any modification to the in strument Return the instrument to Yokoga
4. aximum conductor size is 24mm in diameter 3 Other Functions 3 1 Auto Power Off Function This is a function to prevent the instrument from being left powered on in order to conserve battery life The instrument automatically turns off about 10 minutes after the last switch or button operation To turn to normal mode turn the Range switch to OFF then to the desired position 3 2 Data Hold Function This is a function used to freeze the measured value on the display Press the button to freeze the reading The reading will be held regardless of subsequent variation in input is shown on the upper right corner of the display while the instrument is in the Data Hold mode To exit the Data Hold mode press the button again NOTE When the Auto Power Off function works while instrument is in the data hold mode data hold is cancelled 3 3 Optional Accessories Clamp Adapter Model 99025 For AC current measurement only Clamp Adapter Model 99025 is designed MAX 100mm to increase the measuring capability of a clamp meter With the use of the Clamp Adapter you can not only extend current range over 2000A but also clamp ona large bus bar or conductor 1 Set the Range Switch to the A position 2 As shown in the figure below clamp Model CL120 onto the pickup coil of Model 99025 3 Clamp Model 99025 onto the bus bar or conductor under test 4 Take the reading on Model CL120 and multiply it by 10 NOTE
5. cur while you are using the tester follow the instructions given below If the tester still fails to operate correctly and needs repair contact the vendor from whom you purchased the in strument or the nearest Yokogawa M amp C sales office e Turn off the POWER switch once then turn it back on again e If the tester does not turn on replace the battery with a new one Calibration It is recommended that the instrument be calibrated once every year YOKOGAWA Yokogawa M amp C Corporation YOKOGAWA M amp C CORPORATION International Sales Dept 2 9 32 Nakacho Musashino shi Tokyo 180 8750 Japan Phone 81 422 52 5716 Facsimile 81 422 55 8654 YOKOGAWA CORPORATION OF AMERICA U S A Phone 1 770 253 7000 Facsimile 1 770 251 2088 YOKOGAWA EUROPE B V THE NETHERLANDS Phone 31 334 64 1611 Facsimile 31 334 64 1610 YOKOGAWA AMERICA DO SUL S A BRAZIL Phone 55 11 5681 2400 Facsimile 55 11 5681 1274 YOKOGAWA ENGINEERING INSTRUMENTS KOREA CORPORATION KOREA Phone 82 2 551 0660 to 0664 Facsimile 82 2 551 0665 YOKOGAWA AUSTRALIA PTY LTD AUSTRALIA Phone 61 2 9805 0699 Facsimile 61 2 9888 1844 YOKOGAWA BLUE STAR LTD INDIA Phone 91 80 227 1513 Facsimile 91 80 227 4270 LTD YOKOGAWA ELECTRIC RUSSIAN FEDERATION Phone 7 095 737 7868 Facsimile 7 095 737 7869 KIM3E 2003 2
6. itions specified in EN 61000 4 3 1997 e f equipment generating strong electromagnetic interference is located nearly the testers may malfunction 1 Instrument Layout Open Close Lever Transformer Jaws Range Switch Safety Hand Strap LCD Display Data Hold Mode AC Current Current Low Battery Warning 2 Measurement 2 1 Preparation for Measurement A CAUTION e The jaw section is a delicate precision sensor Do not subject the jaw to unreasonably strong shock vibration or force when using it e f dust gets into the tops of the jaws remove it immediately Do not close the jaws when dust is trapped in its joints as the sensor may break e Please check that the Range switch is set to the desired position before measurement 2 2 AC Current Measurement A WARNING Never use the instrument on a circuit above 300V AC This may cause electrical shock hazard and damage to the instrument or the circuit under test 1 Set the Range Switch to the 20A or 200A position AC should be shown on the upper left corner of the display 2 Press the open close lever to open the transformer jaws and clamp them onto a single conductor and take the reading on the display The most accurate reading will be obtained by keeping the conductor at the center of the transformer jaws NOTE e During current measurement keep the transformer jaws fully closed Otherwise accurate measurements cannot be taken M
7. s per second Temperature and Humidity for Guaranteed Accuracy 23 C 5 C relative humidity up to 75 without condensation e Operating Temperature and Humidity 0 to 40 C relative humidity up to 85 without condensation e Storage Temperature and Humidity 10 to 50 C relative humidity up to 75 without condensation e Effect of conductor position Within 2 difference between maxi mum and minimum values to a 10 mm dia conductor e Effect of external magnetic field 0 8 A or less in AC magnetic field of 400 A m Power Source Tow LR44 or SR44 3V DC batteries Battery Life Approx 100 hours continuous Current Consumption Approx 1mA Auto power off function Turns power off approx 10 minutes after the last switch operation e Withstanding Voltage 3700V AC for 1 minute between housing case and metal part of jaws e Insulation Resistance 10MQ or greater at 1000V between hous ing case and metal part of jaws Conductor Size Approx 24mm diameter max Dimensions Approx 59 W x 147 H x 26 D mm Weight Approx 100g batteries included Safety Standard EN 61010 1 EN 61010 2 032 300V AC CAT Ill Pollution degree2 indoor use e EMC Standard EN 55022 e Radiation immunity EN 61000 4 3 e Accessories LR44 battery A WW ENE TT 2 Carrying case Model 93033 1 User s Manual ee ee 1 Optional Accessories Clamp adapter Model 99025 6 Calibration and After sales Service Should any failure oc
8. wa M amp C or your dis tributor for repair or re calibration e Always switch off the instrument before opening the battery com partment cover for battery replacement A WARNING To avoid damage to the instrument or electric shock The restrictions on the maximum voltage level for which the CL120 testers can be used depend on the over voltage categories specified by the safety standards These category specifications are formulated to protect operators against transient impulse voltage in power lines Maximum Allowable Input Function OVERVOLTAGE CATEGORY III 200Arms AC A PEER Measuring circuit voltage 300Vrms AC Over voltage category CAT I Signal level special equipment or parts of equipment telecommu nication electronic etc with smaller transient over voltages than CAT II Over voltage category II CAT II Local level appliance portable equipment etc with smaller tran sient over voltages than CAT III Over voltage category III CAT III Distribution level fixed installation with smaller transient over voltages than CAT IV A CAUTION e Be sure to set the Range Switch to the OFF position after use When the instrument will not be in use for a long period of time Place it in storage after removing the battery e Use a damp cloth and detergent for cleaning the instrument Do not use abrasives or solvents NOTE e Radiation immunity affects the accuracy of CL120 testers under the cond
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