FINEST 135
Contents
1. aworld leader in test amp measurement l FINEST FINE INSTRUMENTS CORPORATION 341 5 SONGNAE DONG SOSA GU BUCHON SHI KYUNGGI KOREA TEL 82 32 656 8771 4 FAX 82 32 656 5844 E mail fine finest co kr Internet www finestwon com or www finest co kr Copyright 1994 Fine Instruments Corp All right reserved Specifications subject to change without notice Litho in Korea FINEST 135 TRUE RMS CLAMP ON METER B88 b hr om AAMT ld ad a al 1994 FINE INSTRUMENTS CORPORATION All rights reserved Litho in Korea 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 to 750V Frequency 0 5 to 9999Hz Resistance 0 to 4KQ Continuity Check Beep at Approx lt 35 in the 400Q range EA WARNING READ CLAMP ON METER SAFETY BEFORE USING THIS METER 1 Introduction 2 Clamp on Meter Safety 3 Explanation of Controls and Indicators 4 Alignment Marks 5 How to Use this Meter 6 Applications of Measurement 7 Maintenance and Calibration 8 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 ll and other safety standards see Technical Data This Meter combines the speed and versatil2. Scale 4 30 dgts 30Hz 45Hz 4 30 dgts 65Hz 1KHz 8 30 dgts 20Hz 30Hz 0 3 to 399 9A 0 1A 3 2 dgts 45Hz 65Hz 400A Scale 4 3 dgts 30Hz 45Hz 4 3 dgts 65Hz 1KHz 8 3 dgts 20Hz 30Hz 400 to 700A 1A 5 45Hz 65Hz 400A Scale 7 30Hz 45Hz t7 65Hz 1KHz Not Specified 20Hz 30Hz greater than 40 hours on meter power up Poe ane RMS Min Max ADD 10 counts 1A and above 30Hz 45Hz AVG only 2 5A and above RMS Min Max Add 2 of reading INSTANTANEOUS AMPERES CREST MODE Sine Wave measured with conductor centered at alignment marks and battery life indication RANGE RESOLUTION ACCURACY 0 4 to 39 99A 0 2A 3 30 dgts 45Hz 65Hz 40A Scale 4 30 dgts 30Hz 45Hz 4 30 dgts 65Hz 1KHz 4 40 dgts 20Hz 30Hz 0 4 to 399 9A 2A t 3 3 dgts 45Hz 65Hz 400A Scale t 4 3 dgts 30Hz 45Hz 4 3 dgts 65Hz 1KHz 4 4 dgts 20Hz 30Hz 400 to 599A 4A t3 45Hz 65Hz 400A Scale t4 30Hz 45Hz t4 65Hz 1KHz t4 20Hz 30Hz 600 to 999A 4A t7 45Hz 65Hz 400A Scale t7 30Hz 45Hz 7 65Hz 1KHz t7 20Hz 30Hz 1 Same as 1 2 Same as 3 3 2 5A and above 31 FREQUENCY RANGE RESOLUTION ACCURACY 0 5 to 999 9 Hz 0 1 Hz 0 2 3 dgts 1000
3. 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 with blinking 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 available in the other V or Hz or Q 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 it left off Press and hold the MIN MAX pushbutton for 2 seconds and then release in order to exit RECORD This Meter acknowledges with a beep sound and RECORD is no longer displayed 18 5 14 Using Record REGUAD BAK HA AWG n m i Pome aig els tishar basinal malna 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 detected since RECORD started The MIN reading is the minimum value de
4. 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 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 harmonic 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 component 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 TRIPLENS are particularly added together in the neutral These harmonics can from 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 maximum 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 cur
5. Continuity Testing GFL RIENE TE PE NEPRE Press the if pushbutton to enable the continuity testing mode This Meter defaults in the 400 ohm range and then highest bar graph scale shows 400 The digital display reads OFL Continuity testing verifies that circuit connections are intact Test resistances below 35Q cause the Meter to emit a continuous tone 15 Input Range Beeper On If 400Q Approx lt 359 Table 1 Beeper Response in Continuity Test The continuity mode is extremely fast and can be used to detect either shorts or opens that last for as little as 100 milliseconds 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 value is very close to the threshold erratic beeps can also occur due to environmental electrical noise EMI DOD fimin Mamatni setausduietaimlagiel 5 11 Using Soft 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 unaffected by this SOFT function and updates 20 times each second SOFT function can be used for ampere readings or voltage readings Press the SO
6. FT CREST pushbutton twice when in the AC or DC amperes mode or once when in the voltage mode in order to exit SOFT 16 5 12 Using Crest Ana mn m me elf LIA a i eee leas sieni fvaraMesar dan alas 168 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 half cycle 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 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 pushbutton once to exit CREST Then PEAK is no longer displayed 5 13 m Record OO Pita iNiidehG eons smrauid diuuiay tala i 7 i To enable RECORD Press the MIN MAX pushbutton The blinking RECORD is displayed 17 The recording of a new maximum or minimum is 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 recorded MAX and MIN But in the frequency
7. at each 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 than release in order to return to autoranging mode This Meter acknowledges with a beep sound and displays AUTO 10 5 5 Measuring DC Amperes lt OIN OOE ATEEN EE TTT EEEE Press the AC DC pushbutton to select the DC amperes measurement mode AC disappeared 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 display 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 cur
8. d 20 Ed Displayed when 4 pushbutton has been pressed 21 SOFT Displayed when current flow readings or Hz or V readings are softened out over 3 second intervals 22 KQVHz Displayed when measuring ohms or voltage or frequency 23 PEAK Displayed when current flow readings are in halfcycle peak amperes Crest mode 24 RMS Displayed when current reading is in amperes rms 25 OFF SCALE ARROW Displayed when bar graph pointer is off scale 26 DUAL Displayed when measuring frequency in digital and amperes in bar graph simultaneously 27 A Displayed when meter is measuring amperes 28 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 29 POINTERS Displayed to indicate position on bar graph scale Positions are updated 20 times each second 30 ANALOG DISPLAY POLARITY Displays or when the pointers are displayed 31 0 to 400A or 0 to 800A Numeric reference for the bar graph 32 EM Displayed when internal battery needs replacing 33 AC Alternating Current or Voltage 34 Automatically indicate negative digital displays 35 AUTO Displayed when autoranging controls bar graph scale 0 to 40A scale or 0 to 400A scale and controls position of decimal point on digital display 36 POWER LOCK Displayed when the Auto Power off mode of the
9. egligible 0 1 or less if the measurement circuit source impedance is 10 Kilohms or less 5 9 Measuring Resistance te wip iki qbiariauie bla augu Press the Q pushbutton to enable the resistance measurement mode This Meter defaults in the autoranging mode and displays KQ 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 resistance 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 14 EA CAUTION TURN OFF POWER ON THE TEST CIRCUIT AND DISCHARGE ALL CAPACITORS BEFORE ATTEMPTING INCIRCUIT RESISTANCE MEASUREMENTS IF AN EXTERNAL VOLTAGE IS PRESENT ACROSS A COMPONENT IT WILL BE IMPOSSIBLE TO TAKE AN ACCURATE 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 between the probes and the circuit under test is good Dirt Oil Solder flux or other foreign matter seriously affect resistance 5 10
10. ent To view the maximum inrush current press the MIN MAX pushbutton once Repeat step 6 if necessary To clear RECORD press the MIN MAX pushbutton for 2 seconds 6 4 Distribution Transformers AN ol You can measure excessive current load balance between phases true rms and frequency of neutral current True rms measurement yields the effective value 1 2 Press the ON OFF pushbutton to turn on this Meter Clamp around a phase wire of the transformer Be sure the clamp jaws are securely closed of measurements will not be accurate Observe the display for true rms current flow Repeat your measurement for each phase to observe balance Unbalanced phases cause large neutral currents flow Clamp around the neutral wire Observe the display for true rms current flow Any significant flow with balanced phases indicates the presence of harmonic currents Press the Hz pushbutton to measure the frequency of neutral wire Reading indicates the frequency of the dominant current flow in case of harmonic current flow 180Hz reading in a 60Hz system To freeze the digital display press the HOLD pushbutton To measure peak amperes press the 1mS PEAK pushbutton PEAK displayed 25 10 To record readings and to view maximum minimum 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 Conirollers AN ol You can
11. he microprocessor when measuring DC amperes 2 Clamp on Meter Safety In this manual the word DANGER identifies a severe or immediately accessible personal hazard that can cause death 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 damage or destruction of this Meter Observe the International Electrical Symbols listed below AN Warning Risk of electric shock rin Caution Refer to this manual before using this Meter ol Double Insulation Protection Class Il E Never clamp around a conductor at 600V rms or greater or with a frequency of 10KHz or greater E Never use a meter whose insulating protection has been impaired mBe extremely cautious when clamping around uninsulated conductors or bus bars E Use this Meter only as specified in this manual Otherwise the protection provided by this Meter may be impaired E Observe the safety messages contained in this manual E Avoid working alone E Inspect the test leads for damaged insulation or exposed metal Check test lead continuity Damaged leads should be replaced E Disconnect the live test lead before dis connecting the common test lead E Be sure this Meter is in good operating condition During a continuity test a meter reading that goes from overflow OFL to 0 generally means th
12. is Meter is working properly MSelect the proper function and range for your measurement 3 3 Explanation of Controls and Indicators 1 16 15 14 13 12 11 10 9 1 CLAMP Opens 2 04 inches 52mm to enclose conductors 2 HOLD Freezes reading in digital display 3 DISPLAY Liquid crystal display 4 RANGE Selects 0 to 40A 0 to 400A or AUTO 5 ON OFF Selects meters power ON or power OFF 6 Selects continuity testing mode 7 Q Selects ohms measurement mode 8 VQ Volt Ohms Continuity Test Input Terminal 9 V Selects volts measurement mode 10 COM Common Terminal 11 Hz Selects frequency measurement mode 12 A Selects amperes measurement mode 13 MIN MAX Selects RECORD mode and displays recorded MAX MIN and AVG 14 SOFT CREST Selects SOFT for a running 3 second average or CREST for half cycle peak amperes 1R AONO Qalanrte AC ar NO mada oe prerese ameen fie pene ee a ae S t ALTO Oe ag A _ Mig 259 iji z ae Sale Hn ui 15 ata I Imi TEIA dit eT al a A im MCI LIF L 16 LEVER Opens and closes clamp jaws 17 RECORD Displayed blinking when MAX MIN and AVG values are being recorded Duration of RECORD is limited by battery life 18 MAX MIN AVG Displayed in RECORD mode by pressing MIN MAX pushbuttons 19 CEE Displayed when HOLD pushbutton has been presse
13. ity of a high resolution analog display with the precision of a digital meter 1 This Meter measures the true rms value of Alternating Current AC over from 0 3A to 700A AC measurements are from 10Hz to 1KHz and frequency measurements are from 0 5Hz to 10KHz Clamp meters that measure average current flow are inaccurate for non linear currents and their measurements may 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 E HOLD function to freeze readings E 41 segment analog bar graph that displays current while simultaneously measuring frequency on the digital display Hi Low battery indicator and battery life indicator at powerup using bar graph E 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 HA SOFT mode to display a 3 second running average WA CREST mode that measures half cycle peak AC amperes WA 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 E Zero adjustment by t
14. measure input current output current and frequency of the adjustable speed motor controllers The output current frequency is used to calculate the rotating speed of the motor while input current frequency is used to measure the frequency of the power line The frequency of the output current is important because the voltage frequency is often meaningless for the calculations of motor controller speed 1 Press the ON OFF pushbutton to turn on this Meter 2 Clamp around an input or output phase as required and run motor at desired speed Be sure the clamp jaws are securely closed or measurements will not be accurate 3 Observe the display for true rms current flow 4 Measure an output phase of the motor controller and use Hz mode to measure frequency Nominal motor speed is calculated from RPM 120F P where F is the frequency measured and P is the number of motor poles 26 5 To record readings and to view readings press the MIN MAX pushbutton 6 To clear RECORD press the MIN MAX pushbutton for 2 seconds 7 Maintenance and Calibration 7 1 Maintenance Repairs or servicing should only be performed by qualified personnel FA 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 mis
15. meter has been disabled 37 BEEPER Beeps for pushbutton operation or current overload 38 OFL Overflow Indication 4 Alignment Marks 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 5 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 displayed 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 Place this Meter face down on a non abrasive 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 to the terminals of a new 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
16. ng 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 remaining battery life Release the ON OFF pushbutton to initialize this Meter Replace the battery before using this Meter when the battery test gives a reading of only a few hours or when the low battery indicator is displayed on the digital display If this Meter dose not turn ON the battery is missing or worn out To replace the battery see 5 1 Battery Replacement 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 ER 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 than this Meter is in manual range Press RANGE pushbutton for 2 seconds to return to Autoranging mode 5 4 Measuring AC Amperes POG 5 ens Fearn tans ale Iriri ilalah tt aE When this meter has been powered up it defaults in the AC amperes mode with 250 ms mea surement intervals AC displayed and auto ranging mode AUTO displayed which auto matically 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 th
17. og 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 to 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 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 545g 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 E for a period of one year after calibration AC Current RMS AMPERES RANGE RESOLUTION ACCURACY 0 30 to 39 99A 0 01A 3 20 dgts 45Hz 65Hz 40A
18. pated in wiring transformers 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 commercial 3 phase 50Hz 60Hz power applied to transformer with a delta connected 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 20 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 connected to which were incandescent lighting small motors and other devices that presented linear loading The result was an essentially
19. rent 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 currents flows through the conductor in the backward moving direction of a right hand threaded screw 11 5 6 Measuring Frequency 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 autoranging is applied to the bar graph which represents rms value of the current flow When in AUTO frequency measurement uses an auto trigger threshold based on one half of the peak current mea surement This provides the best sensitivity 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 are imposed for frequency readings The thresholds are 6A 40A scale or 40A 400A scale The frequency display is 0 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 acknowledges with a beep sound and displays AUTO on the digital display Press the other function A or V or Q or pushbutton to exit the frequency mode 12 5 7 Using Data Hold 0 0 Uau peanniisniain i PAAT we 5 To freeze the digital display reading HOLD is not applied to
20. rent flow 21 1 The AC neutral wires must be of sufficient 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 6 2 General Applications AN o You 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 22 To soften readings press
21. sing 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 27 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 AN ol WHEN SERVICING THIS METER USE ONLY THE REPLACEMENT PARTS SPECIFIED Replaceable parts are shown in Figure 3 and listed in Table 2 28 7 3 Calibration This Meter should be calibrated annually Regarding the service calibration information on this Meter contact the nearest distributor of this Meter Table 2 Replaceable Parts ITEM DESCRIPTION PART NUMBER Q TY 1 Lens LCD CL2 LENS 1 2 Cover Rear CL2 CASE 1 3 Screw Case metric CL2 SCRW 2 4 Battery 9V CL1 BT09 1 5 User s Manual CL3 MAN 1 6 Clip on Holster C130 1 7 Test Lead Set TL34 1 Figure 3 Replaceable Parts 29 8 Technical Data and Specifications 8 1 Technical Data Display Digital 4000 counts 3 digits Hz 9999 counts updates 4 times sec Anal
22. tected since RECORD started The AVG reading is 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 CENIE blinks In this mode readings may be taken without disturbing the values held in memory To restart recording press the HOLD pushbutton Then RECORD blinks 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 EHE is blinking the digital display is showing a real measurement when mae is not blinking the digital display 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 MAX 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 19 Press the MIN MAX pushbutton for 2 seconds and then release in order to exit RECORD or HOLD and RECORD it 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 important because it directly relates to the amount of heat dissi
23. 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 To record readings and to view readings press the MIN MAX pushbutton To clear RECORD press the MIN MAX pushbutton for 2 seconds 23 6 3 Motors AN ol You can measure starting inrush current running current and current imbalance Inrush current is typically 6 times the value of running current depending on the motor type 1 2 Press the ON OFF pushbutton to turn on this Meter Clamp around a motor phase conductor Be sure the clamp jaws are securely closed or measurements will not be accurate While watching the bar graph turn on the motor and observe the level of inrush current In this case the bar graph is better than the digital display because the bar graph response is faster than the digital display 4 24 When the motor reaches the desired speed observe the running current Repeat your measurement for each motor phases Unbalanced current may be caused by a voltage imbalance or a shorted motor winding Repeat steps 1 thru 3 then press the MIN MAX pushbutton to enable RECORD 9 10 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 displayed level running rms curr
24. the bar graph press the HOLD pushbutton GEHE is displayed when HOLD is enabled 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 frequency reading will be 0 0Hz when HOLD is released if the trigger 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 RAME 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 Gad rtseteietoernrnaet shele obetilates Press the V pushbutton to enable the voltage measurement mode and then select AC or DC by toggling the AC DC pushbutton 13 This Meter defaults in the autoranging mode and displays V AC and AUTO AUTO autoranging 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 100pF 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 n
25. the rear cover ensuring it slips beneath the holddown 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 A 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 FA WARNING MOST OF THE TYPICAL APPLICATIONS ARE EXPOSED TO LETHAL VOLTAGES BE CAUTIOUS WHEN TAKING MEASUREMENTS BEFORE THE METER IS CONNECTED TO ANY CIRCUIT REVIEW THE SAFETY INFORMA TION ALWAYS KEEP YOUR HANDS BEHIND THE METER S HAND GUARD 5 3 Power Up Self Test m oe fiii ji aini sepi Latag pilige sp ti ebidaa i bbbiidd kbbkidd ibbbiiddit Press and hold the ON OFF pushbutton in order to power up and initiate self test This meter beeps and all LCD segments will 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 battery condition while still pressing the ON OFF pushbutton The Off Scale arrow blinks for a battery life in excess of 40 hours and a correspondi
26. to 9999 Hz 1 Hz 0 2 3 dgts 1 Same as 1 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 RANGE RESOLUTION ACCURACY 0 30 to 39 99A 0 01A 2 30 dgts 0 3 to 399 9A 0 1A 2 10 dats 400 to 700A 1A AC Voltage True RMS DC Voltage ACCURACY AC VOLTAGE RANGE RESOLUTION 45Hz to 65Hz 45Hz to 1KHz DC VOLTAGE 0 to 39 99V 0 01V 1 0 3 1 0 3 0 to 399 9V 0 1V 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 60Hz 32 Resistance RANGE RESOLUTION ACCURACY 0 to 399 90 0 10 1 0 10 0 to 3 999KQ 19 1 0 3 Continuity Check RANGE CONTINUITY BEEPER 4002 Approx lt 359 33
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