finest 135 true rms clamp-on meter
Contents
1. m A CREST mode that measures half cycle peak AC amperes m A MIN MAX RECORD mode to record maximum minimum and average values of rms current softened rms frequency voltage or ohms Half cycle peak maximum may also be recorded in the CREST mode m Zero adjustment by the microprocessor when measuring DC amperes 2 Clamp on Meter Safety In this manual the word DANGER identifies a severe or immediately accessible personal hazard thatcancausedeath or injury the word WARNING identifies a personal hazard about a condition or procedure that could cause death or injury the word CAUTION identifies an equipment hazard about a condition or procedure that could cause darnage or destruction of this Meter Observe the International Electrical Symbols listed below A Warning Risk of electric shock Caution Refer to this manual before using this Meter 0O Double Insulation Protection Class Il m Never clamp around a conductor at 600V rms or greater or with a frequency of 10KHz or greater m Never use a meter whose insulating protection has been impaired E Beextremely cautious whenclampingaround uninsulated conductors or bus bars Use this Meter only as specified in this manual Otherwise the protection provided by this Meter may be impaired Observe the safety messages contained in this manual m Avoid working alone m Inspect the test leads for damaged insulation or exposed metal Check tes2. nnn st CJS LIA is When this meter has been powered up it defaults in the AC amperes mode with 250 ms measurement intervals AC dis played and autoranging mode AUTO displayed which automatically selects the proper range for both the bar scale and the digital display Press the RANGE pushbutton to select a fixed scale instead of autoranging Observe thateach press alternates between the 40A and 400A scales and AUTO is no longer displayed When the reading is beyond the limits of the digital display for example 40A on a 40A scale OFL appears on the digital display Press the RANGE pushbutton for 2 seconds and then release in order to return to autoranging mode This Meter acknow ledges wrth a beep sound and displays AUTO 5 5 Measuring DC Amperes G35 o beaeshedankoanetoetafanontaaooleroatoriihi Press the AC DC pushbutton to select the DC amperes measurement mode AC disappeard on the LCD but the meter is still in the autoranging mode AUTO displayed unless you press the RANGE pushbutton to enter into the manual ranging mode When the DC amperes measurement mode is entered the display reads a non Zero DC amperes positive or negative value due to the presence of the Earth s Magnetism This value is variable according to the location measuring DC amperes Zero Adjustment by the Microprocessor To initiate the Zero Adjustment procedure press the HOLD pushbutton for 2 second Then the meter beeps and the disp
3. TRIPLENS are particularly added together in the neutral These harmonics can form a total rms current in the transformer s neutral wire that is normally 130 of the total rms current measured in any individual phase whose theoretical maxi mum is 173 For example phase currents of 80 amperes may cause harmonic current flow in the neutral of 104 amperes The dominant current flow in the neutral is most commonly the 3rd harmonic The electrical system designer must consider the following 3 issues when he designs a power distribution system containing harmonic current flow 1 The AC neutral wires must be of suff icient gauge to allow for harmonic current flow 2 The distribution transformer must have additional cooling to continue Operation at its rated capacity if it is not harmonic rated This is because the harmonic current flow in the secondary neutral wire is circulating in the delta connected primary winding after it is reflected to the primary winding The circulating harmonic current heats up the transformer 3 Phase current harmonics are reflected to the primary winding and they continue back towards the power source This can cause distortion of the voltage wave so that any power factor correction capacitors on the line can be easily overloaded We can use this Meter to analyze components such as power distribution transformers and power factor correction capacitors 20 6 2 General Applications A im You
4. is applied to the bar graph To measure voltage connect this Meter in parallel with the load or circuit under test Each of the three AC DC voltage ranges presents an input impedance of approximately 10 MQ in parallel with less than 100 pF Measurement errors due to circuit loading can result when making either AC or DC voltage measurement on circuits with high source impedance In most cases the error is negligi ble 0 1 or less if the measurement circuit source im pedance is 10 Kilohms or less 5 9 Measuring Resistance auto UFL EEE S E A a S AAAAAAAAAAALLLOAAACRAAAONAOAOAOAOGRAOAANA Press the 2 pushbutton to enable the resistance measure ment mode This Meter defaults in the autoranging mode and displays KR and AUTO And also the off scale arrow of the bar graph blinks and the digital display reads OFL AUTO autoranging is applied to the bar graph This Meter measures resistance by comparing the internal reference resistance given by a resistor array with the unknown resistance to be measured Remember the re sistance displayed by this Meter is the total resistance through all possible paths between the probes This explains why in circuit measurement of resistors does not often yield the ohms value indicated by the resistor s color code CAUTION TURN OFF POWER ON THE TEST CIRCUIT AND DIS CHARGE ALL CAPACITORS BEFORE ATTEMPTING IN CIRCUIT RESISTANCE MEASUREMENTS IF AN EX TERNAL VOLTAGE IS PRESENT ACROS
5. 0Hz when a trigger threshold is not reached Press the RANGE pushbutton for 2 seconds and then release in order to return to autoranging mode This Meter acknow ledges with a beep sound and displays AUTO on the digital display Press the otherfunction A or VorQor 11 push button to exit the frequency mode 5 7 Using Data Hold 2 CoecstooceDecsstocecHevostavecdsooetesnal To freeze the digital display reading HOLD is not applied ta the bar graph press the HOLD pushbutton is displayed when HOLD is enabled 12 When HOLD is used while measuring frequency RANGE can be changed only for imposing trigger thresholds of 6A on the 40A scale and 40A on the 400A scale The frequen cy reading will be 0 0Hz when HOLD is released if the trig ger threshold is not reached When in the HOLD mode this Meter function can be changed from the held function to one of the other functions when HOLD is automatically released Press the HOLD pushbutton again is no longer displayed in order to exit HOLD Press the RANGE pushbutton for 2 seconds and then release in order to autoranging mode This Meter acknowledges with a beep sound and displays AUTO on the digital display 5 8 Measuring AC DC Voltage AUTO nnn E Ac LS LI Press the V pushbutton to enable the voltage measurement mode and then select AC or DC by toggling the AC DC push button This Meter defaults in the autoranging mode and displays V AC and AUTO AUTO autoranging
6. manual and 9V battery installed Battery Type NEDA 1604A 9V or 6LF22 9V Battery Life 80 hours typical alkaline Safety Standards UL 1244 IEC 348 1010 IEC 664 Appropriate Parts Installation Category Ill CSA C22 2 No 231 ANSI ISA S82 VDE 0411 Weight Approx 1 21 Ib 5459 Size 4 39cm H x 9 75cm W x 24 5cm L 1 73 H x 3 84 W x 9 65 L 8 2 Specifications Accuracy is given as of reading number of least significant digits at 18 C to 28 C with relative humidity up to 80 for a period of one year after calibration 28 AC Current RMS AMPERES RANGE RESOLUTION ACCURACY 2 1 8 20 dats 45Hz 65Hz 0 30 to 39 994 0 01A 4 30 dgts 30Hz 45Hz 3 40A Scale 4 30 dgts 65Hz 1KHz 8 30 dgts 20Hz 30Hz 3 2 dgts 45Hz 65Hz 0 3 to 399 94 0 1A 4 3 dgts 30Hz 45Hz 3 400A Scale 4 3 dots 85Hz 1KHz 8 3 dgts 20Hz 30Hz 4 5 45Hz 65Hz 400 to 700A 1A 7 30Hz 45Hz 3 400A Scale 7 65Hz 1KHz Not Specified 20Hz 30Hz 4 l Sine Wave measured with conductor centered at alignment marks and battery life indication greater than 40 hours on meter power up 2 RMS Min Max ADD 10 counts 3 1A and above 30Hz 45Hz 4 AVG only 2 SA and above RMS Min Max Add 2 of reading INSTANTANEOUS AMPERES CREST MODE RANGE RESOLUTION ACCURACY 3 30 dgts 45Hz 65
7. value is very close to the threshold er tatic beeps can also occur due to environmental electrical noise EMI 15 5 11 Using Soft ON OIG o 1 3 Viscctocncdeceetersctoacetisoatecsetucedl Observe that SOFT is displayed after pressing the SOFT CREST pushbutton once This SOFT mode digitally displays a running average of readings over 3 second interval to reduce the fluctuation of the readings The bar graph is un affected by this SOFT function and updates 20 times each second SOFT function can be used for ampere readings or voltage readings Press the SOFT CREST pushbutton twice when in the AC or DC amperes mode or once when in the voltage mode in order to exit SOFT 5 12 Using Crest m e Lihi LIA VeocetetuctavecticcaQvecetecsalecuctsucsl Observe that PEAK is displayed after pressing the SOFT CREST pushbutton twice PEAK is available for AC ampere readings only and can not be selected when in the other modes Both the digital display and bar graph measure the halfcycle peak AC amperes when PEAK is displayed The crest factor of a waveform is the ratio of its half cycle peak amperes to its rms amperes Half Cycle Peak Amperes RMS Amperes Crest Factor 16 The Crest Factor is a nominal 1 414 for linear current flow without current wave distortion Crest Factors other than 1 414 indicate the presence of harmonic current flow See 6 1 Non Linear Loads Press the SOFT CREST pushbutto
8. AX pushbutton to start recording while in the HOLD mode RECORD is not blinking because this Meter is not recording values And if you cycle through the MAX MIN and AVG readings this Meter displays just eee 18 Press ithe MIN MAX pushbutton for 2 seconds and then release in order to exit RECORD or HOLD and RECORD if selected This Meter acknowledges with a beep sound and RECORD is no longer displayed 6 Applications of Measurement 6 1 Non Linear Loads True RMS current flow is very impot tant because it directly relates to the amount of heat dissipated in wiring trans formers and system connections Most ammeters in the market measure average current flow not true rms current flow even if this average current flow is displayed on a scale calibrated in rms These average sensing ammeters are accurate only for a pure sign wave current All current waveforms are virtually distorted in some way The most common is harmonic distortion caused by non linear loads such as household electrical appliances personal Computers or speed controls for motor drives Harmonic distortion caused significant current flow at frequencies that are at odd multiples of the power line frequency Harmonic current flow gives a substantial impact on the neutral wires of star wye connected power distribution Systems In most countries a power distribution system uses com mercial 3 phase 50Hz 60Hz power applied to a transformer with a delta con
9. Can measure any conductor carrying AC unless this conductor is at a potential above 600V AC or at a frequency above 10KHz True rms measurement yields the effective current value 1 Press the ON OFF pushbutton to turn on this Meter 2 Clamp around the conductor to be measured Be sure the clamp jaws are securely closed or measurements will not be accurate 3 Observe the display for true rms current flow 4 Press the Hz pushbutton to measure frequency 5 Press the HOLD pushbutton to freeze the digital display if necessary 21 6 To soften readings press the SOFT CREST pushbutton once SOFT displayed or to measure half cycle peak amperes press this pushbutton twice PEAK displayed A crest factor see 5 11 Using Crest other than 1 414 is an indication of non linear current flow 7 To record readings and to view readings press the MIN MAX pushbutton 8 To clear RECORD press the MIN MAX pushbutton for 2 seconds 6 3 motors A al You can measure starting inrush current running current and current imbalance Inrush currentis typically 6 times the value of running current depending on the motor type 1 Press the ON OFF pushbutton to turn on this Meter 2 Clamp around a motor phase conductor Be sure the clamp jaws are securely closed or measurements will not be accurate 3 While watching the bar graph turn on the motor and observe the level of inrush current In this case the bar graph is better t
10. FINEST 135 TRUE RMS CLAMP ON METER USER S MANUAL FINEST 735 CLAMP METER ROWER RECORD MAX MIN AVG ew GM SOFT a W CI m FEI cone ro ge J Ct LI oie RMS foveatucceDestsdeceetereevcieedorertreced ON MAX Chest te RANGE OFF M 1994 FINE INSTRUMENTS CORPORATION All rights reserved Litho in Korea This Meter measures the true rms value of Alternating Cur rent AC over from 0 3A to 700A AC measurements are from 10Hz to 1 KHz and frequency measurements are from 0 5Hz to 10KHz Clamp meters that measure average current flow are in accurate for non linear currents and their measurementsmay have some differences from those obtained using this Meter This Meter can also measure frequency while measuring current flow simultaneously AC and DC voltages and resistances can be measured and also continuity check is possible with this Meter This Meter also provides E Auto Range or Manual Range selection HOLD function to freeze readings E 41 segment analog bar graph that displays current while simultaneously measuring frequency on the digital display m Low battery indicator and battery life indicator at power up using bar graph Automatic power off after 10 minutes of inactivity and power lock to disable the automatic power off function E When an ineffective pushbutton is pressed this Meter beeps twice continuously m A SOFT mode to display a 3 second running average
11. Hz 0 4 to 39 998 0 2A 4 30 dgt s 30Hz 45Hz 40A Scale 4 30 dgts 65Hz 1KHz 4 40 dgts 20Hz 30Hz 3 3 3 dgl s 45Hz 65Hz 0 4 to 3999A 2A 4 3 dgts 30Hz 45Hz 2 400A Scale 4 3 dats 30Hz 45KHz 4 4 dgts 20Hz 30Hz 3 45Hz 65Hz 400 to 599A 4A 4 30Hz 45Hz 400A Scale 4 65Hz 1KHz 4 20Hz 30Hz 3 1 45Hz 65Hz 600 to 999A 4A 7 30Hz 45Hz 400A Scale 7 65Hz 1KHz 7 20Hz 30Hz 7 3 ySamesas 1 2 Sames as 3 3 254 and above 29 FREQUENCY RANGE RESOLUTION 0 5 to 999 9 Hz 0 1 Hz 1000 to 9999 Hz 1 Hz 1 1 Same as 1 ACCURACY 0 2 3 dgts 0 2 3 dats With current autorange Trigger Level 5 Hz to 1500 Hz 0 7A RMS or more 1 2 peak current With manual ranging Trigger Threshold 10 Hz to 1000Hz 40A Range 6A RMS or more will trigger 400A Range 40A RMS or more will trigger DC Current RESOLUTION ACCURACY 2 30 dgts 2 10 dgts AC Voltage True RMS DC Voltage ACCURACY RANGE RESOLUTION AC VOLTAGE DC VOLTAGE 45 Hz to 65 Hz 45 Hz to 1 KHz 0 to 39 99V 1 0 3 1 0 3 0 to 399 9V 2 5 5 0 to 750V 1V 1 5 5 1 5 5 AC Voltage Common Mode Rejection Ratio gt 80dB dc to 60Hz DC Voltage Normal Mode Rejection Ratio gt 11dB at 50Hz or 60Hz Common Mode Rejection Ratio gt 84dB at dc 50Hz or 60H
12. S A COM PONENT IT WILL BE IMPOSSIBLE TO TAKE AN AC CURATE MEASUREMENT OF THE RESISTANCE OF THAT COMPONENT The resistance in the test leads can diminish accuracy on the lowest 400 ohm range The error is usually 0 1 to 0 2 ohms for a Standard pair of test leads When measuring resistance be sure that the contact be tween the probes and the circuit under testis good Dirt Oil Solder flux or other foreign matter seriouslyaffect resistance 14 5 10 Continuity Testing MEI wrk 2 3 400 srdeacubercnrarchrcest reer bepeet aang kp Iie li UOAGUAAAGLOUGHAOCGGOOULULOUGLADALEADUGO Press the j pushbutton to enable the continuity testing mode This Meter defaults in the 400 ohm range and then highest bar graph scaleshows 400 The digital display reads OFL Continuity testing verifies that circuit connections are intact Test resistances below 352 cause the Meter to emit a con tinuous tone Table 1 Beeper Response in Continuity Test Input Range Beeper On If 4002 Approx lt 35 Q The continuity mode is extremely fast and can be used to detect either shorts or opens that last for as little as 100 mil liseconds When a change is detected the beeper tone is stretched to last at least 1 4 second so you can hear it and detect both shorts and opens This can be a valuable troubleshooting aid when looking for intermittents associated with cables connections switches relays etc If the test
13. ale or 0 to 400A scale and controls position of decimal point on digital display POWER LOCK Displayed when the Auto Power off mode of the meter has been disabled BEEPER Beeps for pushbutton Operation or current overload OFL Overflow Indication 4 Alignment Marks MARK CONDUCTOR MARK MARK HAND GUARD Figure 1 Alignment Marks Position the conductor within the jaws at the intersection of the indicated marks as much as possible Figure 1 in order to meet this Meter s accuracy specifications if the conductor is positioned elsewhere within the jaws the maximum additional error resulted is 1 5 percent s How to Use this Meter 5 1 Battery Replacement This Meter is powered by a single 9V battery NEDA Type 1604A 6LF22 or 006p To guarantee the specified battery life alkaline or other long life batteries are recommended if the low battery indicator on the digital display will be dis played replace the battery by using the following procedure referring to Figure 2 1 Unclamp this Meter from any conductor and turn it off by pressing the ON OFF pushbutton 2 Piace this Meter face down on a nonabrasive surface and completely loosen the three rear panel screws with a Phillips head screwdriver 7 3 Grasp the bottom of the rear cover and lift it free of the case 4 Lift the battery from the case and carefully disconnect the battery connector leads 5 Snap the battery connector leads
14. are showninFigure 3 and listed in Table 2 7 3 Calibration This Meter should be calibrated annually Regarding the service calibration information on this Meter contact the nearest distributor of this Meter 26 Table 2 Replaceable Parts E PART ITEM DESCRIPTION NUMBER D Lens LCD CL2 LENS D Cover Rear CL2 CASE 3 Screw Case metric CL2 SCRW 4 Battery 9V CL1 BT09 5 User s Manual CL3 MAN O Clip on Holster C130 D Test Lead Set TL34 Figure 3 Replaceable Parts 27 8 Technical Data and Specifications 8 1 Technical Data Display Digital 4000 counts 3 digits Hz 9999 counts updates 4 times sec Analog Updates 20 times sec 41 segment bar graph Maximum Conductor Size 51mm 2 00 Maximum Jaw Opening 52mm 2 04 Max Conductor Voltage 600V rms Frequency Range Current Measurement 10Hz to 2KHz Frequency Measurement 0 5Hz to 10KHz Crest Factor Continuous Waveform 45Hz to 65Hz less than 1000A peak 1 4 to 2 0 add 20 digits to accuracy below 100A 2 0 ta 3 0 add 1 to accuracy 20 digits below 100A 3 0 to 5 0 add 2 to accuracy 20 digits below 100A Adjacent Conductor Effect 1 of current in adjacent conductor max Operating Temperature 10 C to 55 C Operating Humidity 0 to 80 40 C 70 50 C Storage Temperature 20 C to 60 C Standard Equipment Clamp on Meter Clip on Holster Test leads User s
15. han the digital display because the bar graph response is faster than the digital display 22 4 When the motor reaches the desired speed observe the running Current 5 Repeat your measurement for each motor phase Un balanced current may be caused by a voltage imbalance or a shorted motor winding 6 Repeat steps 1 thru 3 then press the MIN MAX pushbutton to enable RECORD 7 Turn on the motor When the motor gets to the desired speed note the blinking upper bar on the bar graph inrush rms current and the displayedlevel running rms current 8 Ta view the maximum inrush current press the MIN MAX pushbutton once 9 Repeat step 6 if necessary 10 To clear RECORD press the MIN MAX pushbutton for 2 seconds 6 4 Distribution Transformers A g You can measure excessive current load balance between phases true rms and frequency of neutral current True rms measurement yields the effective value 1 Press the ON OFF pushbutton to turn on this Meter 2 Clamp around a phase wire of the transformer Be sure the clamp jaws are securely closed or measurements will not be accurate 3 Observe the display for true rms current flow 4 Repeat your measurement for each phase to observe balance Unbalanced phases cause large neutral currents flow 5 Clamp around the neutral wire 23 1 Press the ON OFF pushbutton to turn on this Meter 6 Observe the display for true rms current flow Any s
16. ignificant flow with balanced phases indicates the 2 Clamp around an input or output phase as required presence of harmonic currents and run motor at desired speed Be sure the clamp jaws are securely closed or measurements will not be 7 Press the Hz pushbutton to measure the frequency of accurate neutral wire Reading indicates the frequency of the dominant current flow in case of harmonic current flow 3 Observe the display for true rms current flow 180Hz reading in a 60Hz System K x f 4 Measure an output phase of the motor controller and use 8 To freeze the digital display press the HOLD Hz mode to measure frequency Nominal motor speed pushbutton is calculated from RPM 120 F P where F is the fre quency measured and P is the number of motor poles 9 To measure half cycle peak amperes press the SOFT CREST pushbutton twice PEAK displayed A crest 5 Torecord readings and to view readings press the MIN factor other than 1 414 is an indication of harmonic MAX pushbutton current flow 6 To clear RECORD press the MIN MAX pushbutton for 10 To record readings and to view maximum minimum 2 seconds and average values press the MIN MAX pushbutton 11 To clear RECORD press the MIN MAX pushbutton for 2 seconds 6 5 Adjustable Speed Motor Controllers A ol You can measure input current output current and frequency 7 Maintenance and Calibration of the adjustable speed motor con
17. ill turn on some segments have nothing to do with this Meter as part of a self test routine Observe a bar graph pointer blinks to indicate the battety condition while still pressing the ON OFF pushbutton The Off Scale arrow blinks for a battery life in excess of 40 hours and a corresponding bar graph pointer blinks for a battery life of less than 40 hours Read the scale as 0 to 40 hours for this battery test A pointer under the 3 6 is not displayed on the scale for example represents approximately 30 hours of rematning battery life Release the ON OFF pushbutton to initialize this Meter Replace the battery before using this Meter when the bat tery test gives a reading of only a few hours or when the low battery indicator is displayed on the digital display If the Meter does notturn ON the battery is missing or worn out To replace the battery see 5 1 Battery Replacement 9 This Meter shuts OFF after 10 minutes if no pushbutton is pressed even if it is making a measurement To disable the auto power off press the ON OFF pushbutton FOER is displayed when if you press the ON OFF pushbutton again the Meter turns OFF When you want to use this Meter in manual range press the RANGE pushbutton then this Meter is in manual range Press RANGE pushbutton for 2 seconds to return to Au toranging mode This Meter s auto power off feature is disabled when you are using the RECORD mode 5 4 Measuring AC Amperes
18. lay reads Zero just after the microprocessor memorized the right preceding display value that is used for calculating the exact DC amperes measurement value when measuring the DC amperes of a current carrying conductor When measuring the DC amperes of a current carrying conductor the DC amperes value has a positive or negative polarity according to the direction of current carrying This value is positive when the current flows through the conductor in the forward moving direction of a right hand threaded screw And it is negative when the current flows through the conductor in the backward moving direction of a right hand threaded screw 5 6 Measuring Frequency AUTO n m Hz T kd hal 2 a 40 A Feanelpacolecnutucss svecdeusebsavetoaur DUAL To enable the frequency measurement mode press the Hz pushbutton This Meter displays Hz DUAL and AUTO The frequency of the current flow is displayed AUTO auto ranging is applied to the bar graph which represents rms value of the current flow When in AUTO frequency mea surement uses an auto trigger threshold based on one half of the peak current measurement This provides the bestsen sitivity and noise immunity To select a fixed 40A or 400A bar graph display AUTO is no longer displayed press the RANGE pushbutton With a fixed 40A or 400A scale fixed trigger thresholds areimposed for frequency readings The thresholds are 6A 40A scale or 40A 400A scale The frequency display is 0
19. n once to exit CREST Then PEAK is no longer displayed 5 13 Enabling Record RECORD nnn oa G L LIA we Ccscrbeveoleecotacnedecvatescolsctetercl To enable RECORD press the MIN MAX pushbutton The blinking RECORD is displayed The recording of a new max imum or minimumis indicated by beep sounds We can use RECORD in all modes of this Meter but we can not change Meter modes while in RECORD for example from voltage to amperes In the AC amperes mode the bar graph displays the rms value of current flow and also blinking pointers at the record ed MAX and MIN But in the frequency mode the bar graph displays the rms value of current flow only No blinking Pointers In SOFT the softened values of rms current flow frequency or voltage is recorded for MAX MIN and AVG The bar graph displays instantaneous values of rms current withblink ing pointers for MAX and MIN In CREST that is PEAK mode the half cycle peak amperes are recorded for MAX In CREST mode MIN and AVG are not available The bar graph displays a single blinking pointer for MAX The CREST that is PEAK function is not availa ble in the other V or Hz or 2 modes To stop recording use the HOLD pushbutton Then RECORD no longer blinks and the values of MAX MIN and AVG are frozen Press the HOLD pushbutton again to restart recording when the values of MAX MIN and AVG are not reset The recording simply starts again from where itieft off Pres
20. nected primary and a star wye connected secondary The secondary generally provides 120V AC from phase to neutral and 208V AC from phase to phase To balance the loads for each phase was a big headache for the electrical system designer historically The vector addition of the currents in the transformer s neutral wire was zero or quite low because perfect balance was rarely achieved in a well balanced system devices con nected to which were incandescent lighting small motors and other devices that presented linear loading The result was an essentially sine wave current flow in each phase and a low neutral Current flow at a frequency of 50Hz 60Hz But devices such as TV sets fluorescent lighting video machines and microwave ovens are commonly drawing 19 power line current for only a fraction of each cycle so that they cause non linear loading and subsequent non linear current flow This generates odd harmonics of the 50Hz 60Hz line frequency Therefore the current in the transformer of today contains not only a 50Hz or 60Hz component but a 150Hz or 180Hz component a 250Hz or 300Hz com ponent and the other significant harmonic components up to a 750Hz or 900Hz component and beyond The vector addition in a properly balanced power distribution system feeding non linear loads may still be quite low But the addition does not cancel all the harmonic currents The odd multiples of the 3rd harmonic called the
21. s and hold the MIN MAX pushbutton for 2 seconds and then release in order to exit RECORD This Meter ac knowledges with a beep sound and RECORD is no longer displayed 5 14 Using Record RECORD MAX MIN AVG I bhAn After enabling RECORD press the MIN MAX pushbutton to cycle through the MAX MIN and AVG readings held in memory If this Meter is in CREST that is PEAK function only MAX is held in memory Battery life limits the duration of RECORD The MAX reading is the maximum value de tected since RECORD started The MIN reading is the mini mum value detected since RECORD started The AVG readings calculated continuously from the start of RECORD To stop recording and to freeze the values of MAX MIN and AVG in memory press the HOLD pushbutton Press the MIN MAX pushbutton to cycle through the readings including a position where the blinks In this mode readings may be taken without disturbing the values held in memory To restart recording press the HOLD pushbutton Then RECORD birnks When using HOLD and RECORD note that when RECORD is blinking this Meter is recording values when RECORD is not blinking this Meter is not recording values When is blinking the digital display is showing a real measurement when is not blinking the digital dis play is showing a recorded measurement HOLD and RECORD apply to the digital display only The bar graph shows a real measurement only at all times if you press the MIN M
22. t lead continuity Damaged leads should be replaced Disconnect the live test lead before disconnecting the common test lead Be sure this Meter is in good operating condition During a continuity test a meter reading that goes from overflow OFL ta 0 generally means this Meter is working properly 3 E Select the proper function and range for your measure 4 RANGE Selects 0 to 40A 0 to 400A or AUTO ment ON OFF Selects meters power ON or power OFF 3 Selects continuity testing mode 7 N Selects ohms measurement mode VQ Volt Ohms Continuity Test Input Terminal 3 Explanation of Controls and indicators CLAMP Opens 2 04inches 52mm to enclose con V Selects volts measurement mode ucla aA COM Common Terminal HOLD Freezes reading in digital display a Hz Selects frequency measurement mode Sy DISPLAY Liquid crystal display A Selects amperes measurement mode 3 MIN MAX Selects RECORD mode and displays recorded MAX MIN and AVG POWER RE See E 6p LOR ee 70 a cate nom PEAK 9 6 ap ot A i oe 03 6 ea DUAL 6 so ey r UI L G SOFT CREST Select SOFT for a running 3 second average or CREST for half cycle peak amperes 1 AC DC Selects AC or DC mode ees ee G LEVER Opens and closes clamp jaws 4 RECORD Displayed blinking when MAX MIN and 10 Ap ul AVG values are being recorded Duration of RECORD is limited by bat
23. tery life Ole MAX MIN AVG Displayed in RECORD mode by pressing MIN MAX pushbuttons Displyed when HOLD pushbutton has been pressed a a amp y 28 23 amp 4 x OO Oe oy Displayed when ej pushbutton has been pressed SOFT Displayed when current flow readings or Hz or V readings are softened out over 3 second intervals K OVHz Displayed when measuring ohms or voltage or frequency PEAK Displayed when current flow readings are in half cycle peak amperes Crest mode RMS Displayed when current reading is in amperes rms OFF SCALE ARROW Displayed when bar graph pointer is off scale DUAL Displayed when measuring frequency in digital and amperes in bar graph simultaneously A Displayed when meter is measuring amperes DIGITAL DISPLAY Displays 3999 counts with two decimal points relative to the two ranges But displays 9999 counts in frequency mode Display is updated 4 times each second POINTERS Displayed to indicate position on bar graph scale Positions are updated 20 times each second ANALOG DISPLAY POLARITY Displays or when the pointers are displayed 0 to 400A or 0 to 800A Numeric reference for the bar graph Displayed when internal battety needs replacing AC Alternating Current or Voltage aa Automatically indicate negative digital displays AUTO Displayed when autoranging controls bar graph scale 0 ta 40A sc
24. tothe terminals of anew battery and insert the battery into Position Dress the battery leads so that they will not be pinched between the case bottom and the case top 6 Replace the rear cover ensuring it slips beneath the hold down lip next to the jaws and fits securely into Position 7 Reinstall the three securing screws If this Meter is not be used for periods of longer than 60 days remove the battery and store it separately Figure 2 Battery Replacement 5 2 Notes For taking full advantage of this Meter s capabilities read completely in sequence each of the following pages It is not necessary to make a measurement to learn how to use this meter Take the time to read this section completely before attempting any meter applications because this meter has many features and operating sequences that are not readily apparent WARNING MOST OF THE TYPICAL APPLICATIONS ARE EXPOSED TO LETHAL VOLTAGES BE CAUTIOUS WHEN TAKING MEASUREMENTS BEFORE THE METER IS CONNECT ED TO ANY CIRCUIT REVIEW THE SAFETY INFORMA TION ALWAYS KEEP YOUR HANDS BEHIND THE METER S HAND GUARD 5 3 Power Up Self Test POWER RECORD MAX MIN AVG GINO GED SOFT LOCK AUTO KQVH2 _ PEAK AC n s s RMS m a 24 a6 a4o0A Gesectccusteccrtinrodosastecnelrogubenns z AAAAAAAAAAALAOAAGAAAAARIACODAAAAAAAAAAAAA OVAL Press and hold the ON OFF pushbutton in order to power up and initiate self test This meter beeps and all LCD seg ments w
25. trollers The output current 7 1 Maintenance frequency is usedto calculate the rotatingspeedof the motor while input current frequency is used to measure the Repairs or servicing should only be performed by qualified frequency of the power line The frequency of the output personnel current is important because the voltage frequency is often meaningless for the calculations of motor controller speed 25 24 WARNING TO AVOID ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING PROCEDURE UNLESS YOU ARE QUALIFIED TO DO SO READ CLAMP ON METER SAFETY AT THE BEGINNING OF THIS MANUAL BEFORE PROCEEDING To assure continued safety of this Meter inspect this Meter before use for cracks or missing portions of the insulating cover or for loose or weakened components Pay particular attention to the insulation surrounding the clamp jaws and clamp lever Any Meter that fails this inspection should be made inoperative by taping the clamp shut Periodically wipe the case with a damp cloth and detergent do not use abrasives or solvents Open the clamp jaws and wipe the magnetic pole pieces with a lightly oiled cloth Do not allow rust or corrosion to form on the pole pieces The serial number is stamped on the back of the unit The serial number should be used when ordering parts or requesting service calibration information 7 2 Replaceable Parts WHEN SERVICING THIS METER USE ONLY THE RE PLACEMENT PARTS SPECIFIED Replaceable parts
26. z 30 Resistance RANGE RESOLUTION ACCURACY 0 to 399 99 0 19 1 0 10 0 to 3 9992 2 1 0 3 Continuity Check RANGE CONTINUITY BEEPER rox lt 350 4000 App 31 Measurement Limits AC Amperes True rms 0 3 to 700A DC Amperes 0 3 to 700A AC Voltage True rms 0 to 750V DC Voltage 0 ta 750v Frequency 0 5 to 9999Hz Resistance 0 to 4KQ Continuity Check Beep at Approx lt 359 in the 4000 range WARNING READ CLAMP ON METER SAFETY BEFORE USING THIS METER Contents Introduction Clamp on Meter Safety Explanation of Controls and Indicators Alignment Marks How to Use this Meter Applications of Measurement Maintenance and Calibration on Oa fk WO PD Technical Data and Specifications 1 Introduction This Meter is a handheld and battery operated True RMS Clamp on Meter that is designed and tested according to IEC Publication 348 Safety Requirements for Electronic Measuring Apparatus Protection Class l1 and other safety Standards see Technical Data This Meter combines the speed and versatility of a high resolution analog display with the precision of a digital meter
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