User`s Manual
Contents
1. 8 2 10 Average Measurement 9 3 Other Functions 10 3 1 Sleep Function 10 3 2 Data Hold Function 10 3 3 LoHz Function 10 3 4 Optional Accessories 10 4 Battery Replacement 12 5 Specifications 13 6 Calibration and After sales Service 17 A WARNING e Never make measurement on a circuit above 600V AC or 600V DC 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 Do not exceed the maximum allowable input of any measurement range Never open the battery compartment cover when making measurement Do not use the instrument if there is any damage t2. me Normal l re Normal r Resistance Q Average i l Average Peak l 1 Peak Continuity Frequency check 6 Button Used for zero adjustment on DCA and resistance ranges On DCA range EU is shown on the display to indicate auto zeroing is completed This switch is also used to reset the display reading in the Peak mode 7 LCD Display Field effect type of liquid crystal display with maximum counts of 3999 Function symbols and decimal point are displayed ac cording to selected function and mode AC DC Average mode Data hold Negative sign Resistance Voltage Continuity check Ampere Low frequency input SOW bakery Warming Peak mode DCA auto zero 8 Hi Terminal Accepts the red test lead for voltage or resistance measure ment 9 Lo Terminal Accepts the black test lead for voltage or resistance meas urement 10 Safety Hand Strap Prevents the instrument from slipping off the hand during use 2 IM CL235 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 33mm 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 Turing the Function Selector switch to a position other than DCA cancels the zero adjustment 2 3 AC Current Measurement A WARNING
3. 2 Plug the red test lead into the Hi terminal and the black test lead into the Lo terminal Check that OL over indication is indicated on the LCD display 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 6 IM CL235 2 9 Peak Measurement 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 In this mode J2Y4 is indicated on the display e Response time is 200ms in DC measurement and 500ms in AC meas urement A WARNING e Never use the instrument on a circuit above 600V AC DC 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 HZI should be shown on the display 3 Fol
4. 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 Z 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 strument 3 Replace the battery observing correct polarity Use a new 6F22 Alkaline or 6LR61 Manganese 9V battery 4 Re place and screw the battery compartment cover Battery compartment cover 12 IM CL235 5 Specifications B instrument Specifications e Measuring Ranges and Accuracy at 2345 C 45 to 75 relative humidity DC Current Measuring Range Auto ranging CSREES BEd 1 0 rdg 5dgt 150 to 1000A Auto ranging Lo 0 to 399 9A Shifts to Hi at 399 9A Hi 150 to 1000A Shifts to Lo at 150A At 1020A or above OL is shown AC Current A Crest factor CF 3 0 Measuring Range Auto ranging 0 to 399 9A 1 5 rdg 5dgt 50 60Hz 150 to 600A 3 5 rdg 5dgt 40 to 1kHz Conversion method AC coupled true rms respon
5. e Do not make measurement on a circuit above 600VDC This may cause shock hazard or damage to the instrument or equipment under test e Do not make measurement with the test leads plugged into the instrument 1 Set the Function Selector switch to the A 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 Oth erwise accurate measurements cannot be taken Maximum conductor size is 33mm 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 frequency of the current is low LOHz is indicated on the display 4 IM CL235 2 4 DC Voltage Measurement A WARNING Do not make measurement on a circuit above 600VDC This may cause shock hazard or damage to the instrument or equipment under test Nw 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 Plug the red test lead into the Hi terminal and the black test lead into Lo terminal 3
6. or force when using it e If 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 and mode are set to the desired position before measurement 2 2 DC Current Measurement A WARNING e Do not make measurement on a circuit above 600VDC This may cause shock hazard or damage to the instrument or equipment under test e Do not make measurement with the test leads plugged into the instrument 1 Set the Function Selector switch to the A position DC should be shown on the upper left corner of the display 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 When zero adjustment is completed appears on the dis play 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 IM CL235 3 5 Mode Selector Button Selects measuring mode Press this switch to cycle through measuring modes The instrument is in the normal NOR after it is powered up In any mode pressing this switch for more than one second returns the instrument to the NOR mode ese Ad esM A Q 2 ACA ACV DCA DCV Resistance Continuity
7. I T 564 0063 ARRAT IIE 1 23 101 XIBIERSBILZRU JL 10 id 06 6368 7041 27 JY 06 6368 7045 rn ap x I 7450 0003 4 EThHARE127 2 AFERE E JL 12 f ig 052 581 7490 27 DY amp UJ 052 581 7664 BR B amp B S X MF 1730 0037 Smtp Ep 8 12 IREZU Z UE 8h ig 082 240 7676 27 2 Y3 082 541 4567 A WM t X Pr 7812 0037 ETTE 2 REAR 3 21 ABBY EORR EYA 7 i ig 092 262 5740 e Lx 092 262 5741 T 180 5679 RRA Eh PAT 2 9 32 tER 0422 52 5679 27 TY SY 0422 51 8455 KIM1JE 2003 2
8. 5 C relative humidity up to 7596 without condensation e Operating Temperature and Humidity O to 40 C relative humidity up to 90 without condensation e Storage Temperature and Humidity 10 to 50 C relative humidity up to 75 without condensation e Effect of conductor position Within 296 difference between maximum and minimum values to a 10 mm dia conductor at every part inside the jaws Power Source 6F22 or 6LR61 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 20uA 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 33mm diameter max Dimensions Approx 91 W x 208 H x 40 D mm Weight Approx 450g with battery Safety Standard IEC61010 1 1995 IEC61010 2 032 1994 AC DC 600V CAT III Pollution degree 2 indoor use e EMC Standard BS EN 55022 1995 e Radiation immunity IEC801 3 1993 e Accessories Test leads Model 98010 e 1set 6F22 or 6LR61 battery eese 1 Carrying case Model 93032 1 User s Manual CINE E 1 e Optional Accessories Clamp adapter Model 99025 16 IM CL235 6 Calibration and After sales Servic
9. 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 2 5 AC Voltage Measurements N WARNING Do not make measurement on a circuit above 600VAC This may cause shock hazard or damage to the instrument or equipment under test a Red test lead Black test lead IM CL235 5 2 7 Continuity Check 400 range fixed The continuity check mode is enabled by pressing the button on resis tance range 9 and Q is indicated on the display to show the instrument in the continuity check mode The buzzer beeps if the resistance under test is 20 or less N WARNING Never use the instrument on an energized circuit 1 Set the Function Selector switch to the 2 9 position 2 Plug the red test lead into the Hi terminal and the black test lead into the Lo terminal Check that OL over indication is indicated on the LCD display 3 With the tip of the test leads shorted together press the button to offset the resistance of the test leads 4 Press the button once to enter from the normal mode to the conti nuity 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 200 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 count
10. User s CL235 Manual Clamp on Tester 72227TA5 IM CL235 sn n PDu ulQ YO i IA Er IM CL235 YOKOGAWA 2003 04 4JRR MC Yokogawa M amp C Corporation B 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 LJ 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 DC AC Voltage Current This symbol indicates DC AC voltage or current Jp Ground This symbol indicates ground earth i N WARNING Indicates that there is a possibility of s
11. ays 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 CL235 testers under the condi tions specified in IEC801 3 1993 e f equipment generating strong electromagnetic interference is located nearly the testers may malfunction IM CL235 iii IM CL235 i 1 Instrument Layout q j amp 57 S te bs CL e DATA CLAMP ON TESTER HOLD 4 a ar e 600V CAT IT AA n OAO YOKOGAWA 4 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 It is also used to turn power on 4 Data Hold Button Freezes the display reading S is shown on the display when Data Hold is enabled IM CL235 1 2 Measurement 2 1 Preparation for Measurement N CAUTION e The jaw section is a delicate precision sensor Do not subject the jaw to unreasonably strong shock vibration
12. ding calibrated to the rms Auto ranging Lo 0 to 399 9A Shifts to Hi at 399 9A Hi 150 to 600A Shifts to Lo at 150A At 620A or above OL is shown DC Voltage m7 V Input impedance 2MQ Measuring Range Auto ranging Accuracy 0 to 39 99V 15 0 to 399 9V 1 0 rdg 5dgt Auto ranging Lo 0 to 39 99V Shifts to Mid at 39 99V Mid 15 0 to 399 9V Shifts to Lo at 15 0V and to Hi at 399 9V Hi 150 to 600V Shifts to Mid at 150V At 620V or above OL is shown AC Voltage V Input impedance 2MQ Crest factor CF 3 0 or less Measuring Range Auto ranging o sy 1 5 rdg 5dgt 50 60Hz 3 5 rdg 45dot 40 to 1kHz Conversion method AC coupled true rms responding calibrated to the rms Auto ranging Lo 0 to 39 99V Shifts to Mid at 39 99V Mid 15 0 to 399 9V Shifts to Lo at 15 0V and to Hi at 399 9V Hi 150 to 600V Shifts to Mid at 150V At 620V or above OL is shown IM CL235 13 Effective Value rms Most alternating currents and voltages are expressed in effective 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 calibrat
13. e Should any failure occur while you are using the tester follow the instructions 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 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 IM CL235 17 YOKOGAWA 4 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 at Al He ou X D T 180 8750 Az AE Er rh PRT 2 9 32 Bak 0422 52 5984 7 F 72 Y3 0422 55 8953 B fa x
14. e current is consumed a little in the Sleep 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 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 3 4 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 CL235 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 CL235 and multiply it by 10 10 IM CL235
15. ed and shown on the display e In the frequency measurement mode RA is indicated on the display e Trigger threshold is 1096 of full scale A WARNING e Never use the instrument on a high voltage circuit above 600VAC This may cause electrical shock 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 three times to enter from the normal mode to the fre quency measurement mode 1H should be indicated on the display 3 Follow instructions for ACA or ACV measurement and take the frequency reading IM CL235 T 1 Set the Function Selector switch to the V position AC should be shown on the upper left corner of the display 2 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 reading of input voltage is 3 of full scale or less in the circuit under test or the frequency of voltage is low symbol LoHz is indicated on the display 2 6 Resistance Measurement A WARNING Never use the instrument on an energized circuit Black test lead 1 Set the Function Selector switch to the 2 9 position The Q should be shown on the upper right corner of the display
16. erious 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 N 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 CL235 i Contents E Precautions for Safety Use of the Instrument i 1 Instrument Layout 1 2 Measurement 3 2 1 Preparation for Measurement 3 2 2 DC Current Measurement 3 2 3 AC Current Measurement 4 2 4 DC Voltage Measurement 5 2 5 AC Voltage Measurement 5 2 6 Resistance Measurement 6 2 7 Continuity Check 400 range fixed T 2 8 Frequency Measurement 7 2 9 Peak Measurement
17. ion 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 Reading errors for Waveform average sensing V rms V avg instruments CF A 0 A 0 lt T gt 1 1114D 1 oM T x 100 p iJT A A 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 IM CL235 15 Resistance Q Measuring Range Auto ranging Accuracy 0 to 399 90 1 09 150 to 39990 M aaa Auto ranging Lo 0 to 399 90 Shifts to Hi at 400 00 Hi 150 to 39990 Shifts to Lo at 1500 At 39990 or above OL is shown Continuity Check 9 Measuring Range Accuracy 0 to 399 90 31 096 rdg 5dgt The buzzer beeps when the resistance is 20 or less Frequency Measuring Range 10 to 3000Hz 1 5 rdg 5dgt 14 IM CL235 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 Response Time Approx 2 seconds Sample Rate Approx 3 times per second Temperature and Humidity for Guaranteed Accuracy 23 C
18. low 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 AC LLLL Indication this value Indication this value DC NOTE e n AC measurement reading are calibrated in RMS values e In DC measurement the Peak mode is available only for positive reading e In the Peak measurement mode measuring range is fixed at Hi 8 IM CL235 2 10 Average Measurement 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 Aver age mode MH 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 CL235 NOTE For the detailed specification refer to the Clamp Adapter User s Manual IM CL235 11 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 the last switch or button operation To exit the Sleep mode turn the Function Selector switch back to OFF then to any other operation or press any button Th
19. o 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 CL235 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 Function Maximum Allowable Input i OVERVOLTAGE CATEGORY III A A AC 600A rms DC 1000A Measuring circuit voltage AC 600V rms DC 600V i l AC 600V rms DC 600V Input terminal to ground voltage Over voltage category CAT 1 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 voltage category III CAT III Distribution level fixed installation with smaller transient over voltages than CAT IV ii IM CL235 N CAUTION e Alw
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