User`s Manual - Test Equipment Depot
Contents
1. 9 2 9 Peak Measurement 10 2 10 Average Measurement mann nn nnn nnn 11 3 Other Functions 12 3 14 Sleep Function n nonane nnn nnn nnn nnn 12 3 2 Data Hold Function 12 3 3 LOHz Function 12 3 4 OUTPUT Terminal For current ranges only 13 3 5 Optional Accessories 14 4 Battery Replacement 0 15 5 Specifications 16 6 Calibration and After sales Service 20 A WARNING e Never make measurement on a circuit above 750V AC or 1000V DC e Do not use the instrument in an atmosphere where any flammable or ex plosive gas is present e Do not attempt to make measurement in the presence of flammable gas ses fumes vapor or dust Otherwise the use of the instrument may cause sparking which can lead to an explosion e Avoid using the instrument if it has been exposed to rain or moisture or if your hands are wet e Do not exceed the maximum allowable input of any mea2. 15 0 to 399 9V Shifts to Lo at 14 9V and to Hi at 400 0V Hi 150 to 750V Shifts to Mid at 149V At 770V or above OL is shown 1 5 rdg 3dgt 50 60Hz 2 0 rdg 4dgt 30 1kHz Resistance Q Measuring Range Auto ranging 0 to 399 90 ere Auto ranging Lo 0 to 399 9Q Shifts to Hi at 400 00 Hi 150 to 3999Q Shifts to Lo at 149Q At 4000Q or above OL is shown Continuity Check Q Range fixed Measuring Range Accuracy 10 to 399 90 1 5 rdg 2dgt The buzzer beeps when the resistance is 20Q or less Frequency Measuring Range Accuracy 10 to 3999Hz 1 5 rdg 5dgt OUTPUT Output impedance about 10kQ Measuring Range Output voltage mVDC Accuracy DC 0 to 399 9A 0 to 399 9mV 1 5 rdg 3mV 150 to 2000A 15 0 to 200 0mV 150 to 1700A 15 0 to 170 0mV 3 0 rdg 3mV 40 1kHz 1701 to 2000A 170 1 to 200 0mV 3 5 rdg 3mV 50 60Hz r 0 to 399 9A 0 to 399 9mV 1 5 rdg 3mV 50 60Hz AC IM CL255 17 e Response Time Approx 2 seconds e Sample Rate Approx 3 times per second e 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 20 to 60 C relative humidity up to 85 without condensation e Effect of conductor position Within 1 5 rdg 3dgt of indicated value at the center t
3. Selects measuring mode The instrument defaults to the normal mode NOR Then press this switch to cycle through measuring modes In any mode pressing this switch for more than one second returns the instrument to the normal mode IM CL255 1 13 Test Leads Model 98011 Connected to Lo and Hi terminals for voltage or resistance measurement 14 Output Plug Model 98012 Plugs into the OUTPUT terminal for con nection to a recording device See section 3 4 OUTPUT Terminal IM CL255 3 sed 7 td A V Q gt ACA ACV DCA DCV Resistance Continuity e Normal l re Normal m gt Resistance Average l l Average Peak l Peak L Continuity L Frequency check 6 Button Used for zero adjustment on DCA and resistance ranges Also used to reset the display reading in the PEAK mode On DCA range GO is shown on the display when auto zeroing is completed Auto zeroing is available on 400A range only 7 LCD Display Field effect type of liquid crystal display with maximum counts of 3999 Function symbols and decimal point are controlled by the microprocessor based on the selected function and measuring mode AC DC Average mode Data Hold Higg Negative sign Resistance Voltage Continuity Check AUTO SS PEAK LoHzj Low frequency 7 Bam input Low battery warning Peak mode DCA auto zero 8 Terminal Cover Slides over Hi and Lo Terminals to prevent access to
4. strument 3 Replace the battery observing correct polarity Use a new 6LR61 Alka line or 6F22 Manganese 9V battery 4 Re place and screw the battery compartment cover Battery compartment cover IM CL255 15 NOTE e Consult the output voltage specifications shown in chapter 5 and adjust the sensitivity of the recording device e On DC current range the button may not completely zero adjust the output voltage from the OUTPUT terminal In this case make zero ad justment on the recording device e Connecting the plug to the OUTPUT terminal disables the Sleep function The function is enabled on removing the plug from the terminal The in strument enters Sleep mode 30 minutes after the plug is removed e For long hours of use of the OUTPUT terminal use an Alkaline battery which will extend continuous recording time up to about 24 hours 3 5 Optional Accessories Clamp Adapter Model 99025 For AC current measurement only Clamp Adapter Model 99025 is designed to increase the measuring capability of a clamp meter With the use of the Clamp Adapter you can not only extend current range over 3000A but also clamp on a large bus bar or conductor 1 Set the Function Selector switch to the A position 2 As shown in the figure below clamp Model CL255 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 CL255 and multiply it by 10
5. 2 With the transformer jaws closed and without clamping them onto the conductor press the button for about one second to zero adjust the display Zero adjust feature is for 400A range only When zero ad justment is completed appears on the display 3 Press the open close lever to open the transformer jaws and clamp them onto the conductor under test then take the reading on the display The most accurate reading will be obtained by keeping the conductor at the center of the transformer jaws 4 IM CL255 NOTE e During current measurement keep the transformer jaws fully closed Oth erwise accurate measurement cannot be made The maximum measur able conductor size is approx 55mm in diameter e When the current flows from the upside the display side to the underside of the instrument the polarity of the reading is positive and vice versa e The button may not completely zero adjust the output voltage from the OUTPUT terminal In this case make zero adjustment on the recording device e Turing the Function Selector switch to a position other than DCA cancels the zero adjustment 2 3 AC Current Measurement A WARNING e Never use the instrument on a circuit above 750VAC This may cause electrical shock hazard and damage to the instrument or the circuit under test e Do not make measurement with the battery compartment cover removed 1 Set the Function Selector switch to the A position AC should be show
6. NOTE For the detailed specification refer to the Clamp Adapter User s Manual 14 IM CL255 5 Specifications instrument Specifications e Measuring Ranges and Accuracy at 23 5 C 45 to 75 relative humidity DC Current Measuring Range Auto ranging 0 to 399 9A 1159 2dgt 150 to 2000A TANO E Auto ranging Lo 0 to 399 9A Shifts to Hi at 400 0A Hi 150 to 2000A Shifts to Lo at 149A At 2020A or above OL is shown AC Current A Crest factor CF 3 0 or less peak current 3000A or less 1 5 rdg 3dgt 50 60Hz 3 0 rdg 4dgt 30 to 1kHz 3 5 rdg 3dgt 50 60Hz Conversion method AC coupled true rms responding calibrated to the rms Auto ranging Lo 0 to 399 9A Shifts to Hi at 400 0A Hi 150 to 2000A Shifts to Lo at 149A At 2020A or above OL is shown DC Voltage mV Input impedance 1MQ Measuring Range Auto ranging 0 to 39 99V 1 0 rdg 2dgt Auto ranging Lo 0 to 39 99V Shifts to Mid at 40 00V Mid 15 0 to 399 9V Shifts to Lo at 14 9V and to Hi at 400 0V Hi 150 to 1000V Shifts to Mid at 149V At 1020V or above OL is shown 16 IM CL255 AC Voltage V Input impedance 1MQ Crest factor CF 3 0 or less peak voltage 1200V or less Measuring Range Auto ranging Accuracy 0 to 39 99V 15 0 to 399 9V 150 to 750V Conversion method AC coupled true rms responding calibrated to the rms Auto ranging Lo 0 to 39 99V Shifts to Mid at 40 00V Mid
7. given below If the tester still fails to operate correctly and needs repair con tact the vendor from whom you purchased the instrument or the nearest Yokogawa M amp C sales office e Turn off the POWER switch once then turn it back on again e Ifthe tester does not turn on replace the battery with a new one Calibration It is recommended that the instrument be calibrated once every year IM CL255
8. pressing the button on resistance range and Q is indicated on the display to show the in strument in the continuity check mode The buzzer beeps if the resistance under test is 20Q or less A WARNING Never use the instrument on an energized circuit 1 Set the Function Selector switch to the Q X position 2 Slide the terminal cover to the left to disclose the Hi and Lo terminals Plug the red test lead into the Hi terminal and the black test lead into the Lo terminal 3 With the tip of the test leads shorted together press the button to offset the resistance of the test leads 8 IM CL255 4 Press the button once to enter from the normal mode to the continuity check mode should be indicated on the display 5 Connect the tip of the test leads to the circuit under test If the resistance is 20Q or less the buzzer beeps 2 8 Frequency Measurement e On ACA or ACV range the frequency of the current or voltage under test can be counted and shown on the display e In the frequency measurement mode DA is indicated on the display e Trigger threshold is approx 10V for AC voltage and approx 10A for AC current At frequency measurement in case of low input signal it often happens that measurement cannot be made Because range is fixed at 400V for AC voltage and at 400A for AC current A WARNING e Never use the instrument on a high voltage circuit above 750VAC This may cause electrical sho
9. User s CL255 Manual Clamp on Tester QVAVITFRFA IM CL255 es Test Equipment 99 Washington Street Depot Melrose MA 02176 Fax 781 665 0780 1 800 517 8431 TestEquipmentDepot com JOKCVCAAIA 4 IM CL255 YOKOGAWA 2003 06 2 h MC 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 property from possible hazards or damage The following safety symbols are used where appropri ate 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 explanation in the User s Manual in order to avoid the risk of personal injury or death and or damage to the instrument O Double Insulation This symbol indicates double insulation AC Voltage Current This symbol indicates AC voltage or current DC Voltage Current This symbol indicates DC voltage or current AC DC Voltage Current This symbol indicates AC DC voltage or current Ground This symbol indicates
10. ck hazard and damage to the instrument or the circuit under test e Do not make current measurement with the test leads plugged into the instrument 1 Set the Function Selector switch to the A or V position 2 Press the button three times to enter from the normal mode to the frequency measurement mode RA should be indicated on the dis play 3 Follow instructions for ACA or ACV measurement and take the frequency reading NOTE When the voltage under test measures 3 of the full scale or less or the frequency of the current or voltage is 40Hz or less LOHz is indicated on the display IM CL255 9 2 10 Average Measurement This mode is available on ACV DCV ACA and DCA ranges 1 Set the Function Selector switch to the A A V or V position 2 Press the button once to enter from the normal mode to the Average mode EQ should be indicated on the display 3 Follow instructions for ACV DCV ACA or DCA measurement 4 The display shows a running average of six readings over an interval of about 2 seconds IM CL255 11 2 9 Peak Measurement e In this mode HAY is indicated on the display e In the PEAK mode the display shows current or voltage s crest in effec tive value For example when the current or voltage is sinusoidal the reading equals the crest value divided by the square root of two The dis play reading is constantly updated with a maximum crest e Respons
11. e time is 300ms in DC measurement and 10ms in AC measure ment A WARNING e Never use the instrument on a circuit above 750VAC or 1000VDC This may cause electrical shock hazard and damage to the instrument or the circuit under test e Do not make measurement with the test leads plugged into the instrument 1 The PEAK mode is available on DCA ACA DCV and DCA ranges Set the Function Selector switch to the A A V or V position Note Only on DCA range press the button for about one second to zero adjust the reading with the transformer jaws closed 2 Press the button twice to enter from the normal mode to the PEAK mode HZ should be shown on the display 3 Follow instructions for DCA ACA DCV or ACV measurement 4 For accurate reading press the button to reset the reading after clamping onto the conductor or making test lead connections to the circuit under test Then proceed to measurement INPUT Current Vp Peak Hold NOTE e In the PEAK mode the auto ranging feature is disabled and measuring ranges are fixed as follows DCA and ACA 0 to 400 0A DCA and ACV 0 to 400 0V e The Sleep function is disabled in the PEAK mode as well 10 IM CL255 3 Other Functions 3 1 Sleep Function This is a function to prevent the instrument from being left powered on in order to conserve battery life This function causes the instrument to enter the Sleep powered down mode about 30 minutes after t
12. ge category III CAT III Distribution level fixed installation with smaller transient over voltages than CAT IV A CAUTION e Always make sure to insert each plug of the test leads fully into the appro priate terminal on the instrument e Make sure to remove the test leads from the instrument before making current measurement e Be sure to set the Function Selector 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 CL255 testers under the condi tions specified in EN 61000 4 3 1997 e f equipment generating strong electromagnetic interference is located nearly the testers may malfunction IM CL255 iil 1 Instrument Layout 1 Transformer Jaws Pick up current flowing through the conductor 2 Open Close Lever Operates the transformer jaws Press to open the Transformer Jaws 3 Function Selector Switch Selects function to use Also switches off the instrument when set to OFF position 4 Data Hold Button Freezes the display reading D is shown on the display when Data Hold is enabled Note When the plug is inserted into the output terminal Data Hold Switch operates as range selection switch See section 3 4 OUTPUT Terminal 5 Mode Selector Button
13. ground earth i IF 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 precau tions for avoiding such injury or loss of life A CAUTION Indicates that there is a possibility of serious personal injury of damage to the instrument if the operating procedure is not followed correctly and describes the precautions for avoiding such injury or damage NOTE Draws attention to information essential for understanding the op eration and features IM CL255 i Contents E Precautions for Safety Use of the Instrument i 1 Instrument Layout 1 2 Measurement 4 2 1 Preparation for Measurement 4 2 2 DC Current Measurement 4 2 3 AC Current Measurement 5 2 4 DC Voltage Measurement 6 2 5 AC Voltage Measurement 7 2 6 Resistance Measurement 8 2 7 Continuity Check 400Q range fixed 8 2 8 Frequency Measurement
14. he last switch or button operation To exit the Sleep mode turn the Function Selector switch back to OFF then to any other position or press any button The current is consumed a little in the Sleep mode NOTE e Connecting the plug to the OUTPUT terminal disables the Sleep function The function is enabled on removing the plug from the terminal e The Sleep function is disabled in the PEAK measurement mode 3 2 Data Hold Function This is a function used to freeze the measured value on the display Press the Data Hold button to freeze the reading The reading will be held regardless of subsequent variation in input D 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 Data Hold button again NOTE If the instrument in the Data Hold mode goes into sleep it will return to the normal mode 3 3 LOHz Function In ACV or ACA range if frequency of the voltage or current under test is 40Hz or lower the display indicates LoHz and sample rate is automatically switched from the normal 3 times sec to 2 times sec to reduce fluctuation of the reading LoHz is also indicated where input is 3 of full scale or less 12 IM CL255 3 4 OUTPUT Terminal For current ranges only A WARNING e Never use the instrument on a circuit above 750VAC or 1000VDC This may cause electrical shock hazard and damage to the instrument or the circuit under tes
15. n 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 IM CL255 5 2 5 AC Voltage Measurements A WARNING Never use the instrument on a circuit above 750VAC This may cause elec trical shock hazard and damage to the instrument or the circuit under test Red test lead Black test lead 1 Set the Function Selector switch to the V position AC should be shown on the upper left corner of the display 2 Slide the terminal cover to the left to disclose the Hi and Lo terminals Plug the red test lead into Hi terminal and the black test lead into the Lo terminal 3 Connect the tip of the red and black test leads to the circuit under test and take the reading on the display NOTE When the voltage under test measures 3 of the full scale or less or the frequency of the voltage is low LOHz is indicated on the display IM CL255 T NOTE e During current measurement keep the transformer jaws fully closed Oth erwise accurate measurements cannot be taken Maximum conductor size is 55mm in diameter e Zero adjustment is not necessary in AC current measurement There is no polarity in the reading either e When the current under test measures 3 of the full scale or less or the frequenc
16. o a 10 mm dia conductor carrying 100A at every part inside the jaws e Effect of external magnetic field 4A or less in AC or DC magnetic field of 400 A m Power Source 6LR61 or 6F22 9V battery Battery Life Approx 15 hours continuity Current Consumption Approx 15mA max Sleep function Automatically powered down in Approx 30 minutes after the last switch operation power consumption Approx 200A e Withstanding Voltage 5500V AC 50 60Hz for 1 minute between electrical circuit and housing case or metal part of the jaws e Insulation Resistance 10MQ or greater at 1000V between electrical circuit and housing case or metal part of the jaws Conductor Size Approx 55mm diameter max Dimensions Approx 105 W x 250 H x 49 D mm Weight Approx 540g with battery Safety Standard EN 61010 1 EN 61010 2 031 EN 61010 2 032 AC DC 600V CAT III AC DC 1000V CAT II Pollution degree 2 indoor use e EMC Standard EN 61326 EN 55022 e Accessories Test leads Model 9801177 1set 6F22 battery ce 4 Carrying case Model 93034 1 Output Plug Model 98012 1 User s Manual DOPTE DESETE DEEE EEND oe 1 e Optional Accessories Clamp adapter Model 99025 Output cable for terminal screw Model 91019 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX LO OO 0B TestEquipmentDepot com IM CL255 Effective Value rms Most alternating currents and voltages are expressed in effec
17. surement range e Never open the battery compartment cover when making measurement e Do not use the instrument if there is any damage to the casing or when the casing is removed e Do not turn the Function Selector switch with plugged in test leads con nected to the circuit under test e Do not install substitute parts or make any modification to the instrument Return the instrument to Yokogawa M amp C or your distributor for repair or re calibration e Always switch off the instrument before opening the battery compartment 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 CL255 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 CATEGORY Il CATEGORY III A ZEA AC 2000A rms AC 2000A rms Measuring circuit voltage Measuring circuit voltage AC 750V rms AC 600V rms DC 1000V DC 600V AC 750V rms DC 1000V alsia AC 600V rms DC 600V ii IM CL255 Over voltage category CAT I Signal level special equipment or parts of equipment telecommunication electronic etc with smaller transient over voltages than CAT II Over voltage category II CAT II Local level appliance portable equipment etc with smaller transient over voltages than CAT III Over volta
18. t e Never apply voltage to the OUTPUT terminal When the plug is inserted into the output terminal auto range function is cleared Set the range depending on the state of Data Hold Switch Data Hold Switch OFF 400A range Data Hold Switch ON 2000A range Note After measurement be sure to return Data Hold switch to OFF posi tion 1 Attach the output plug to a connection lead so that the output voltage can be connected to a recording device such as a chart recorder 2 Slide the terminal cover to the right to disclose the OUTPUT terminal and insert the output plug into the terminal Make connection to the recording device 3 Set the Function Selector switch to the desired position ACA or DCA and follow appropriate measurement instructions IM CL255 13 4 Battery Replacement A WARNING To avoid electric shock hazard make sure to set the Function Selector switch to OFF and remove the test leads from the instrument before trying to re place battery A CAUTIOIN Make sure to install battery in correct polarity as indicated in battery com partment If the battery voltage becomes too low for the instrument to operate normally EJA is shown on the display Then replace the battery Note that when the battery is completely exhausted the display blanks without i shown 1 Set the Function Selector switch to the OFF position 2 Unscrew and remove the battery compartment on the bottom of the in
19. them when OUTPUT terminal is in use 9 OUTPUT Terminal For AC or DC current range only Provides DC volt age output in proportion to the AC or DC current reading The output is connected to a recording device such as a chart recorder for long hour monitoring No output is available on voltage and resistance ranges 10 Lo Terminal Accepts the black test lead for voltage or resistance meas urement 11 Hi Terminal Accepts the red test lead for voltage or resistance meas urement 12 Safety Hand Strap Prevents the instrument from slipping off the hand during use 2 IM CL255 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 Function Selector switch is set to the desired posi tion before measurement 2 2 DC Current Measurement A WARNING e Do not make measurement on a circuit above 1000VDC This may cause shock hazard or damage to the instrument or equipment under test e Do not make current measurement with the test leads connected to the Hi and Lo terminals Correct 1 Set the Function Selector switch to the A position DC should be shown on the upper left corner of the display
20. tive values which are also referred to as RMS Root Mean Square values The effective value is the square root of the average of square of alternating current or voltage values Many clamp meters using a conventional rectifying circuit have RMS scales for AC measurement The scales are however actually calibrated in terms of the effective value of a sine wave though the clamp meter is responding to the average value The calibration is done with a conversion factor of 1 111 for sine wave which is found by dividing the effective value by the average value These instruments are therefore in error if the input voltage or current has some other shape than sine wave Effective Average Conversion Reading errors for ee value value factor average sensing est ee aveform ee V avg V rms V avg instruments T a 2 An 0 242 0 1 11VD 1 x 100 CF Crest Factor is found by dividing the peak value by the effective value Examples DC CF 1 Sine wave CF 1 414 Square wave with a 1 10 duty ratio CF 3 E General Specifications e Operating System Dual integration e Measurement Function AC current DC current AC voltage DC voltage resistance continuity check frequency Display Liquid crystal display with maximum counts of 3999 Overrange Indication OL is shown on the display 18 IM CL255 6 Calibration and After sales Service Should any failure occur while you are using the tester follow the instructions
21. y of the current is low LOHz is indicated on the display 2 4 DC Voltage Measurement A WARNING Never use the instrument on a circuit above 1000VDC This may cause elec trical shock hazard and damage to the instrument or the circuit under test Red test lead Black test lead 1 Set the Function Selector switch to the V position DC should be shown on the upper left corner of the display 2 Slide the terminal cover to the left to disclose the Hi and Lo terminals Plug the red test lead into the Hi terminal and the black test lead into Lo terminal 3 Connect the tip of the red and black test leads to the positive and negative sides of the circuit under test respectively Take the reading on the display 6 IM CL255 2 6 Resistance Measurement A WARNING Never use the instrument on an energized circuit 1 Set the Function Selector switch to the Q position The Q should be shown on the upper right corner of the display 2 Slide the terminal cover to the left to disclose the Hi and Lo terminals Plug the red test lead into the Hi terminal and the black test lead into the Lo terminal 3 With the tip of the test leads shorted together press the button to offset the resistance of the test leads 4 Connect the tip of the test leads to the circuit under test and take the reading on the display 2 7 Continuity Check 400Q range fixed The continuity check mode is enabled by
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