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53

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TRUERMSMEASUREMENT

The meter measures the TRUERMS value of AC voltages and currents. In physical
terms, the RMS (Root-Mean-Square) value of a waveform is the equivalent DC val-
ue that causes the same amount of heat to be dissipated in a resistor. TRUE RMS
measurement greatly simplifies the analysis of complex AC signals. Since the RMS
value is the DC equivalent of the original waveform, it provides a reliable basis for
comparing dissimilar waveforms.

By contrast, many meters use average-responding AC
converters rather than TRUE RMS converters. The scale
factor in these meters are adjusted so that they display the
RMS value for a harmonic-free sine wave. If a signal is not
sinusoidal, average-responding meters do not display
correct RMS readings.

For a free video on Amprobe's Harmonalyzer, HA-2000
harmonic/waveform analyzer, please contact Amprobe
directly.

Summary of Contents for ACDC-620T

Page 1: ...still malfunctions please call the phone number listed below Service Division AMPROBE INSTRUMENT Miami Florida 33150 Tel 800 327 5060 outside the U S A the local Amprobe representative will assist you Visit our Web site HTTP www AMPROBE COM AMPROBE DIVISION OF CORE INDUSTRIES INC Miami Florida 33150 Tel 800 327 5060 ...

Page 2: ...USER MANUAL MODEL ACDC 620T AMPROBE Miramar Florida 33025 Tel 800 327 5060 AUNIQUE AC DC TRUE RMS CLAMP ON MULTIMETER UL C LISTED Manual P N 978760 8 97 z ...

Page 3: ...ards of AMPROBE Your AMPROBE instrument has a limited warranty against defective materials and or workmanship for two years from the date of purchase provided that in the opinion of the factory the instrument has not been tampered with or taken apart Should your instrument fail due to defective materials and or workmanship during the two year period please have your dated bill of sale which must i...

Page 4: ...TH YOUR METER 12 ALIGNMENTMARKS 12 ROTARYSWITCH 13 INPUTTERMINAL 14 PUSH BOTTONS 15 PUSH BOTTONS OPERATIONS 16 POWER ON OPTIONS 18 SPECIALFUNCTIONS INSTRUCTIONS 19 Dynamic Recording 19 Data Hold 22 Zero Relative Analog Bargraph 23 Auto Power Off and Sleep Mode 24 Disable Auto Power Off 25 Demostrate Annunciator 25 Continuity Function For Ohms Measurement 26 1 ms Peak Hold 27 ...

Page 5: ...MEASUREMENT 33 RESSISTENCE CONTINUITYMEASUREMENT 35 TEMPERATURE MEASUREMENT 39 CAPACITANCE MEASUREMENT 43 ESPECIFICACIONES GENERALES 45 GENERALSPECIFICATIONS 47 ACCESSORIES AND REPLACEMENT PARTS 48 CURENT HARMONICS THEORY 51 TRUE RMS MEASUREMENT 53 WAVE FORM COMPARISON 54 REFRIGERATION 56 MAINTENANCE 61 SERVICE BATERYREPLACEMENT 61 CLEANING 64 3 ...

Page 6: ...vided by the meter may be impaired Never measure current while the test leads arer inserted into the input termi nals Do not use the metr if it looks dameged Inspect the leads for damage insulation or exposed metal Check test lead continuity Replace damaged leads Disconnect the power and discharge all high voltage capacitors before testing Use caution when working above 60V DC or 30V AC RMS Such v...

Page 7: ...tegory ll 1000V or Category lll 600V probes insrtallation category CAT ll is an environment with smaller trasient overvolt age than Installation Category lll CE requirement Under the influence of R F field according to standard the supplied test leads will pick up induced noice To have better shielding tests are required in order to conform to CE 1 IEC 801 2 ESD electro static discharge test 2 IEC...

Page 8: ...g of neutral conductors and transformers Currents containing harmonics can only be accurately measured with a true rms or clamp meter this CLAMP ON MULTI METERis shown in Figure1 This meter has many functions which are shown below TRUE RMSmeasurement for non linear and traditional loads 1ms Peak Hold feature to capture glitch or in rush current Differentiation reading for Dual temperature measurem...

Page 9: ...1ms Peak Hold for glitch capture Different Temperatures measurement Hand guard design for more safety Dynamic Recording helps to record the variation of tests And one touch DATA HOLD Rotary switch for easy operation Dual display to indicate the of and C of temperature simultaneously Relative ZERO mode for deviation measurements AUTO MANUAL SELECT ...

Page 10: ...operated instrument for test ing and troubleshooting electrical and electronic systems If the meter is dam aged or something is missing contact the place of purchase immediately A WARNING identifies conditions and actions that pose hazard s to the user a CAUTION identifies and actions that may damage the Meter InternTIONl electri cal symbols used are explained inTable 1 Tabla 1 Símbolos Eléctricos...

Page 11: ...0 MAX Maximum reading 11 MIN Minimum reading 12 AVG Average reading 13 n Continuity function annunciator 14 T1 T2 Delta Temperature withDKTA 620 adapter 15 T1 T2 T1 or T2 temperature measurement 16 C F Unit of temperature 17 V Unit of Voltage measurement 18 A Unit of Curent measurement 19 kW Unit of Resistance ohm measurement 20 _ Zero Delta mode annunciator 21 8 8 8 8 Digital display for degree F...

Page 12: ...11 Figure 2 LCD Display ...

Page 13: ...eter accuracy spacifications when making a current meas urement the conductor must be inside the jaws and centered within the indicated marks as much as possible see Figure 3 Getting Acquainted WIth Your Meter c ALIGNMENT MARKS Conductor Mark MARK MARK ...

Page 14: ...to ON the display remains it until the push button is released 1 OFF Power off position 2 A AC or DC Current Default is AC current El valor predetermina do es corriente alterna CA 3 V AC or DC voltage Default is AC voltage 4 Temp Ω Temperature Differential Temperature Ohms and Continuity The continuity buzzer sounds when test value that is displayed is below 100 counts 5 µF Capacitance measurement...

Page 15: ...ecifications 1 Terminal común para todas las mediciones excepto la de corriente 2 Voltios Ohmios Prueba de Capacidad y mediciones de Temperatura 14 ROTATORYSWITVH FUNCTION AC 400 1000V CATII AC 400 600V CATIII DC 400 1000V CATII DC 400 600V CATIII DC 400 1000 A AC 400 1000 A OHM Ω Capacitance µF Temperature INPUTTRMINAL V Ω µF COM Clamp jaw V Ω µF COM INPUTLIMIT CATII 1000V de CA 1000V DC CATIIl 6...

Page 16: ...Continuity ON OFF for Ohm measurement Press to select T1 T2 T2 for tem perature measurement 3 Press and hold for more than 1 second to set Dynamic Recording then press to step through MAX MIN AVG and present readings 6 In manual range press to step up 1 range at a time Press and hold for 1 sec to select Auto range 4 Press to toggle the relative ZERO mode ON OFF 2 Press to toggle DH ON OFF ...

Page 17: ...sh Data Hold 0The data HOLD function allows operator to freeze the displayed digital value while the analog bargraph continues to display the present reading Press this button momentarily to toggle DH on or off The display shows DH to indicate the hold function If you select Refresh Data Hold by Power ON Options the reading is updated to the display automatically when the reading changes The beepe...

Page 18: ...in the temperature test push this button momentarily to toggle between T1 T2 temperature and T1 T2 diferential temperatures test Note T1 T2 or T1 T2 selected on the DKTA 620 acessory adapter optional 6 AUTO RANGE In auto range press this button momentarily to select manual range and turn off the AUTO annunciator In manual range press this button momentarily to step up 1 range at one time press thi...

Page 19: ...off all beeper functions T DH MAX MIN Demonstrate Annunciators To demonstrate the annunciators to demonstrate all annunciators momentarily press any button to exit the demonstration mod Disable auto power off In general the auto power off function turns the meter off if neither rotary switch nor push button is activated for 15 minutes You can dis able auto power off function by this option When au...

Page 20: ...e operating the equipment under test and can not watch the meter the average reading is useful for smoothing out unstable or changing inputs esti mating the the percent of time a circuit is operational or verifying circuit perform ance The operational procedures are described below 1 Press and hold the MAX MIN push button to toggle recording mode on or off the dynamic recording ode is indicated wh...

Page 21: ...mic recording the auto powe off feature is disabled and the OFF turns off 6 By selecting dynamic recording in the auto range the meter will record the value of MAX MIN or AVG for different ranges 7 The record speed of dynamic reording is about 100 milli seconds 0 1 second 8 The average value is the true average of all measured values taken since the recording mode was entered 20 ...

Page 22: ...Figure 7 Display of Dynamic Recording 21 1 Press for more than 1 second to enter Dynamic Recording ...

Page 23: ...plays the result 1 Press the ZERO button momentarily to set the relative mode This sets the dis play to zero and stores the present reading as a reference value The annunciator will also be displayed Press this button again to exit the relative mode 2 The ZERO relative mode can be set in both the autorange or manual range mode The relative mode can t be set when an overload has occurred 3 When the...

Page 24: ...c ANALOGBATRGRAPH The analog bargraph display provides a 12 segment analog reading representa tion The unit of the bargraph is 100 counts bar Figure 9 relative Zero Operation 23 ...

Page 25: ...recording mode 1 4 The unit has been set to I ms PEAK hold mode 1 5 The auto power off has been disabled with powerup option 2 In the sleep mode the LCD will display a blinking OFF annunciator 2 1 To wake up sleep mode press any push button for 0 5 sec or rotate rotary switch 2 2 Without wake up after 15 minutes the meter will automatically shut off com pletely 3 You must turn the rotary switch to...

Page 26: ...ction press and hold the HOLD MAX MIN button and turn the rotary switch from the OFF position to the desired function When all annunciators are displayed press any button momentarily to exit demonstrate mode and the OFF annunciator will be off c DEMONSTRATE ANNUNCIATOR To demonstrate the annunciators press HOLD MAX MIN button and turn on the meter simultaneously All annunciators will be displayed ...

Page 27: ...e CONTINUITYfunction ON OFF The continuity range is 0 400 0 Ω and the beeper will sound if the resistance is less than 10 0 Ω If another range is selected the unit will beep if the value displayed is less than 100 counts Momentarily pushing this button again will toggle the beeper and annunciator on or off Figure 12 Demostrate Annunciator 26 ...

Page 28: ...t by using the I ms peak hold feature This allows the determination of the crest factor Crest factor Peak value True rms value 1 Press PEAK button for more than 1 second to toggle 1 ms peak hold mode ON OFF 2 Press PEAK button momentarily to select PEAK measurement after entering the peak mode The display shows DH MAX to indicate the PEAK See Figure 16 27 Figure 14 Continuity Operation IIIIIIIIIl ...

Page 29: ... restart the PEAK measurement after setting the peak mode 4 Press button to re set the I ms peak hold again after setting peak mode Note Acrest factor of 1 4 indicates a sinusoidal waveform Figure 16 1ms Peak Hold Display Press and Hold 1 second Press Peak and 1 second Hold V V V DH MAX IIIIlI 28 ...

Page 30: ...CTED FROM THE METER TERMINALS 1 Set the rotary switch to A 2 Open the meter jaws and clamp around a single conductor The most accurate reading will be obtained by keeping the conductor aligned with the centering marks on the jaws Make sure that the jaws are fully closed 3 Read the display 29 ...

Page 31: ...Figure 17 Measuring AC Current CORRECT INCORRECT 30 ...

Page 32: ...ading If the phases are balance any significant current flow on the neutral may indicate the presence of harmonic cur rents 6 Press the HOLD MAX MINbutton to freeze the digital display 7 Press and hold the SHIFTbutton I sec to enter the PEAK mode DH MAX dis played Measure the half cycle PEAK current Divide first reading into the sec ond reading to determine crest factor Acrest factor other than 1 ...

Page 33: ...Figure 18 Measuring AC Curreft 32 ...

Page 34: ... 3 Clamp around a motor phase conductor Be Sure the clamp jaws are com pletely closed or measurement will nor be accurate 4 press ZERO to set the display to zero 5 Turn the mmotor on When the motor gets to the desired speed obbserve the display for inrush current reading 6 If the reading is OL you can push the RANGE button momentarily to change measuring range Turn off the motor 7 repeat your meas...

Page 35: ...Figure 19 Measuring AC Motor Curent 34 ...

Page 36: ... VOLTAGE MEASUREMENT 1 Set the rotary switch to V 2 Insert the black test lead to COM terminal and red test lead to V Ω µF terminal 3 touch the probes to the test points and read the displayed AC Voltage 35 ...

Page 37: ...Figure 20 Measuring Voltage 36 ...

Page 38: ...easurement 4 Touch the test leads to the circuit Fuse Cartridge or other and read resistance value in the display 5 Press button momentarily to enter continuity function if desired 6 Repeat steps 3 and 4 The beeper sounds if continuity reading is less than 10 0 Ω 7 OL overload is displayed if the resistance across the input terminals is greater than the full scale rating on the range setting of th...

Page 39: ...Figura 21 Measuring Resistance and Continuity FUSE CARTRIDGE 38 ...

Page 40: ... V RMS or 60 V DC such voltages pose a shock hazard To perform single input temperature measurement 1 Set the rotary switch to TEMP Ω 2 Insert the model TAC DMM banana to K type thermocouple adapter into the meter The end of adapter must be inserted into V Ω µF terminal 3 Insert the model TPK 56 Type K thermocouple into the TAC DMM 4 Secure the beaded end of the K thermocouple to the surface you w...

Page 41: ...Figure 22 Surface Temperature Measurement 40 Press Shift ...

Page 42: ...de The T1 T2 annunciator will be displayed 6 Since the displayed temperature will be based on the position of the selector switch located on the DKTA 620 adapter select either T1 or T2 for the desired measurement 7 Read the display To measure differential temperature Note T1 temperature must be greater than T2 for differential measurement to be correct 1 Set the DKTA 620 selector switch to the T1 ...

Page 43: ...Figure 23 Measuring Temperature on Refrigeration System Contact where you want to measuring PRESS T 42 ...

Page 44: ...Insert the black test lead to COM terminal and red test lead to V Ω µF terminal 3 Remove at least one leg of the capacitor from circuit board or device 4 Touch the test leads across the capacitor and read the display Note If you are measuring a polarity sensitive electrolytic capacitor touch the red test lead to the positive end of the capacitor and the black test lead to the negative end of the c...

Page 45: ...Figure 24 CAPACITANCEMEASUREMENTS 44 Negro Rojo ...

Page 46: ... A Ohm and Temperature tests 0 5 7 6 seconds per time for Capacitance test Low battery indicator The q appears when the battery voltage drops below 7V approx Operating temperature 0 C to 50 C 32 F to 122 F 0 80 R H Storage temperature 20 C to 60 C 4 F to 140 F 0 80 R H with BATTERYREMOVED Temperature coefficient 0 12 C fr0m O C to 18 C or 28 C to 50 C 0 067 F from 32 F to 64 4 F or 82 4 F to 122 F...

Page 47: ...se Optional Accessories K type bead probe and Dual input adopter Safety Designed and manufactured to conform to UL3111 1 C22 2 NO 1010 1 92 and EN61 010 IEC1 010 1 IEC1010 2 031 fEC 1010 2 032 Installation Category Overvoltage Category 111 OOOV or Installation Category III 60OV Pollution Degree 2 environment Note Meter has been submitted for approval to above standard at the time of print ing of t...

Page 48: ...Carryimg Case included Instruction Manual included 9 Volt Alkaline Battery included Dual input thermocouple adapter opcional Single input thermocouple opcional Type K bead probe opcional DTL 3000 CC ACDC 978760 MN 1604 DKTA 620 TAC DMM TPK 56 Amprobe P N Description ...

Page 49: ...ge Resolution Accuracy Overload 45Hz 400 Hz Protection 400V 0 1V 1000v 1V 1 5 rdg 3 rdg 1000V AC RMS c DC VOLTAJE c AC Voltage TRUERMS Froml 10 al 100 of range Input Impedance 10MΩ less than 100pF crest Factor 3 1 Input Impedance 10MΩ Range Resolution Accuracy Overload Protection 400V 0 1V 1000v 1V 1 rdg 3 rdg 1000 Voltios CA Eficaces RMS c VOLTAGE 1ms PEAKHOLD SPECIFIED ACCURACY 40 Digits for Cha...

Page 50: ...From 10 al 100 of range Crest Factor 3 1 Range Resolution Accuracy 400A 0 1A 1000A 1A 2 rdg 43dgt 2 rdg 43dgt c CORRIENTE RETENCIÓN DE PICO DE 1ms Precisión especificada 40 dígitos para cambios con duración mayor de 1ms Range Resolution Accuracy Maximum Overload Tets Voltage Protection 400Ω 0 1Ω 1000Ω 1Ω 1 rdg 3dgt 3 3V 1 25V 600V RMS c VOLTAJE de CC In contituity mode built in buzzer sounds when ...

Page 51: ...2 input for T1 T2 measuring the accuracy does not include the tolerance of thermocouple probe MODELTPK 56 BEADTYPE K THERMOCOUPLE optional Temperature Rating wire continuous 204 C 260 C intermittent Temperature measuring Range bead 50o C to 800 C MAX Accuracy 2 2 C or 0 75 of reading from 0 C to 800 C whichever is greater 2 2 C or 2 of reading from 0 C to 50o C whichever is greater Caution The bea...

Page 52: ...l load on the neutral wires of wye connected power distribution systems In most countries 50Hz or 60Hz power distribution systems include 3 phase delta primary wye secondary transformers The secondary generally pro vides 120V AC from phase to neutral and 208V AC from phase to phase Historically balancing the loads on each phase was a big headache for the electrical system designer Typically the ve...

Page 53: ...ng a power distribution system that will con tain harmonic current 1 The AC neutral wires must be of sufficient gauge to allow for harmonic current 2 The distribution transformer must have additional cooling to continue opera tion at its rated capacity This is because the harmonic current in the sec ondary neutral wire is circulating in the deltaconnected primary winding This circulating harmonic ...

Page 54: ...the RMS value is the DC equivalent of the original waveform it provides a reliable basis for comparing dissimilar waveforms By contrast many meters use average responding AC converters rather than TRUE RMS converters The scale factor in these meters are adjusted so that they display the RMS value for a harmonic free sine wave If a signal is not sinusoidal average responding meters do not display c...

Page 55: ...RMS calibrated average responding meters display the correct RMS reading of100 0V the DC component equals 0 However consider the 200V peak to peak square wave both types of meter correctly measure the DC component oV The clamp meter correctly measures the AC component 100 0V The average responding meter measures 111 1V which amounts to an 11 error The conversion factors in Table 3 show the differe...

Page 56: ...Table 3 WAVEFORMCOMPARISONCHART 55 RMS CALIS THE DISPLAYED VALUEFOR AVERAGE RESPONDING METERS THATARE CALIBRATED RMS FOR SINE WAVES ...

Page 57: ... resulting gas is at the same temperature but it contains more heat energy than the liquid did At atmospheric pressure common refrigerant gasses such as Freon and Ammonia boil far below water freezing point and absorb heat from their surroundings in the process Likewise as gasses condense they release heat back into their environ ment We can control the boiling point by raising or lowering the pre...

Page 58: ...ure of an evaporator Here the liquefied gas evaporates boils The expansion valve controls how much refrigerant boils and thus how much heat ft absorbs The refrigerant now in gas form circulates through the cool ing coils carrying the heat away with FigurE 25 Refrigeration System EVAPORATOR CONDENSER COMPRESSORS THERMOSTATICEXPANSION VALVE ...

Page 59: ...mpera tures are discussed below c Important Temperature Measurements Evaporator Temperature The entire mid section of the evaporator is at the refrigerant s boiling temperature which is related directly to the evaporator pressure The evaporator temperature should be lower than the desired cooling temperature Evaporator Superheat By the time the refrigerant reaches the last few turns of the evapora...

Page 60: ...and condensing temperature is a critical factor The greater the temperature difference between hot refrigerant and air the faster the heat will dissipate If TD is too low the refrigerant will not completely condense Condenser Superheat The temperature of the hot gas discharged from the compressor is higher than the condensing temperature In the evaporator the difference between the gas temper atur...

Page 61: ... 35 C 90 F 32 C 95 F 35 C 102 F 39 C 105 F 41 C 7 F 4 C 170 F 77 C 190 F 88 88 F 31 C 115 F 46 C 10 F 12 C 2 F 17 C 10 F 12 C 5 F 15 C 10 F 12 C 100 F 38 C 95 F 35 C 15 F 9 C 75 F 24 C 95 F 35 C 120 F 49 C 45 F 7 C 145 F 63 C 10 F 6 C 120 F 49 C 60 F 34 C 225 F 107 C 35 F 19 C 225 F 107 C 150 F 66 C 130 F 54 C Inefficient Compressor Overloaded Condenser Non Condensable Gas This is an example of te...

Page 62: ...ove the test leads and any input signals before opening the case 0 BATTERYREPLACEMENT The meter is powered by a single 9V battery with NEDA1604 S006P IEC6F22 carbon zinc alkaline or similar battery Replace battery if the low battery sign is displayed and flashing Use the following procedure to replace the baftery 1 Remove the meter from the circuit and turn the rotary switch to the OFF position 2 ...

Page 63: ...62 Figure 26 step 1 of Battery replacement Pull up slightly ...

Page 64: ...63 Figure 27 Step 2 of Battery Replacement Pull and move to right ...

Page 65: ... cloth dampened in a solution of mild detergent and water Do not spery cleaner directly onto the instrument since it may leak intothe cabinet and cause damage Do not use chemicals containing benzine benzene touene xylene acetone or sim ilar solvents ...

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