AEMC INSTRUMENTS 725
Contents
1. is K 4 Typically a K 20 is required on main frame computer loads THDF THDF or transformer Harmonic Derating Factor is accessed through the AC current range THDF is a method of calculating transformer derating estab lished by the Computer and Business Equipment Manufacturers Association CBEMA for phase to neutral loads THDF can be applied to electrical sys G AEMC INSTRUMENTS Clamp On Harmonic Meter Model 725 Description cont amp Specifications tems with high third harmonic current and high crest factor and where large por tions of the load are 10 switch mode power supplies THDF yields a value between and 1 With a TRMS phase current of 75 A and a peak current of 180 A the result would be 106 A divided by 180 or 0 58 This indicates that name plate values should be derated to 0 58 of rated KVA FREQUENCY Frequency Hz measurements can be made while measiromg current or volt age This helps detect harmonics by measuring the dominant frequency and is useful for setting frequencies in gener ators or measuring frequencies in vari SPECIFICATIONS ELECTRICAL AC CURRENT TRMS Input Range 0 3 to 1000 0 Arms 0 5 to 1500 0 A peak Basic Accuracy 0 3 to 59 99 A 2 R 20 cts 60 to 1500 A peak 2 R 2 cts Crest Factor gt 5 below 300 A Frequency Range 0 5 Hz to 5 kHz AC VOLTAGE TRMS Input Range 0 5 to 600 Vrms 0 05 to 1500 V peak Basic Accuracy 0 05 to 52. 9 99 V 1 R 10 cts 60 to 1500 V peak 1 R 2 cts Input Impedance 1 MQ Frequency Range 0 5 Hz to 5 kHz DC CURRENT Operating Range 0 10 to 1500 0 A Measurement Range 0 30 to 1500 0 A Basic Accuracy 2 R 20 cts able speed motor drives In Harmonics mode frequency measurements can be taken on individual harmonic orders PEAK SMOOTH Peak is a fast responding function which measures the instantaneous 1 ms peak values ofc the measured signal Typical applications include measure ment of starting or inrushing voltages or currents half cycle sags or surges or even high speed circuit breaker trip points MAX Peak may be recorded in the MIN MAX record mode Smooth stabilizes fluctuating digital readings In this mode the Model 725 calculates and displays a 3 second aver age reading Smooth can be used in V DC VOLTAGE Input Range 0 05 to 600 V Basic Accuracy 0 05 to 59 99 V 1 R 10 cts 60 to 1500 V peak 1 R 2 cts Input Impedance 1 MQ TOTAL HARMONIC DISTORTION THD Range 0 2 to 1000 Resolution 0 1 Basic Accuracy 5 R 2 cts Frequency Range Fundamental 40 Hz to 70 Hz Display Digital YTHD and True RMS A or V Bar graph True RMS A or V Distortion Factor DF Range 0 2 to 100 Resolution 0 1 Minimum Input 10Vor10A Basic Accuracy 5 R 2cts Frequency Range Fundamental 40 Hz to 70 Hz Display Digital DF and True RMS A or V Bar graph True RM
3. Clamp On Harmonic Meter Model 725 TRANSCAT gt wstusattansca com 35 Vantage Point Drive Rochester NY 14624 Call 1 800 800 5001 Features Designed for traditional and nonlinear loads Simple clamp on operation with power quality functions Accurate TRMS amps or volts AC or AC DC Accurate DC measurements A or V Recording mode min max avg max peak Direct reading of THD DF CF and Peak or Individual harmonic orders 1 25th A or V Smooth function for stable readings Auto or manual ranging AEMC Model 725 HARMONIC METER Peak measurements AC or DC or reer t K factor for proper transformer sizing Gave Percent ripple for DC Transformer Harmonic Derating Factor THDF Auto off feature 31 segment analog bar graph APPLICATIONS Low battery indicator True RMS and DC voltage and Identify nonlinear loads current values as Battery voltage level check Prevent overhearing in electrical Determine levels of voltage and distribution equipment false circuit breaker tripping power factor Rugged Lexan construction 99 current distortion correction capacitor failure Audible control warning indications Identify harmonic distortion patterns Derate transformers and generators Built to UL CSA and sources of voltage harmonics to prevent overheating IEC 1010 safety standards Locate sources of harmonic current Me
4. Level Double insulation IEC 1010 1 600 V Category Ill Pollution degree 2 Working Voltage 600 Vrms Dielectric Test 5 5 kV 50 60 Hz 1 minute Overload Protection Voltage 1 5 kV Peak permanent Current 1000 A AC 50 60 Hz permanent Agency Approvals UL CSA GS VDE CE pending ELECTROMAGNETIC COMPATI BILITY Electrostatic Discharge IEC 801 2 No influence 4 kV class 2 Non destructive 15 kV class 4 RF IEC 801 3 No influence 3 V m class 2 Minor influence 10 V m class 3 Transients IEC 801 4 No influence 2 kV class 4 Electric Shocks IEC 801 5 No influence 6 kV class 3 TRANSAT __ gt visiusattianscatcom 35 Vantage Point Drive Rochester NY 14624 Call 1 800 800 5001 ORDERING INFORMATION Clamp On Harmonic Meter Model 725 CATALOG NO it pias RST E E Gat eawes aiaa EDE we E Cat 2111 39 Includesclamp on meter batteries two 5 ft 1 5 m leads two test probes two grip probes user manual and hard carrying case
5. S A or V A and Hz and in all power quality func tions THD DF CF It may also be used during recording mode The bar graph display will not be affected and will continue to display Arms or Vrms MIN MAX RECORDING MIN MAX Recording simultaneously logs the MIN MAX and the true running AVG average of the displayed digital value A V THD DF CF Hz while mea suring The relative time function indi cates elapsed time of the Record mode as well as relative times of capture of MIN and MAX values Each time a new MIN or MAX value is recorded an audible sig nal is emitted so the user can be informed of changes without constantly monitoring the display INDIVIDUAL HARMONICS Range 0 2 to 300 THD or DF Rank Hdc DC component H01 to H25 Resolution 0 1 Accuracy Distortion gt 10 and rank lt H13 5 R 2 cts Distortion gt 10 and rank gt H13 10 R 2cts Distortion lt 10 and rank gt H13 15 R 2cts Distortion lt 10 and rank gt H13 15 R 2cts Frequency Range Fundamental 40 Hz to 70 Hz 25th order Display Digital YTHD and Individual Harmonic value A or V Bar graph True RMS A or V TRANSFORMER HARMONIC DERATING FACTOR CBEMA THDF Range 0 10 to 1 00 Resolution 0 01 Basic Accuracy 2 R 2 cts Display Digital THDF Bar graph Arms Clamp On Harmonic Meter Model 725 Specifications cont TRANSFORMER K FACTOR RATING Range 1 to 30 Resolutio
6. asure crest factor to evaluate harmonic content and determine Triple display Measure individual harmonics CBEMA derating factor Clamp On Harmonic Meter Model 725 Description DESCRIPTION The Clamp On Harmonic Meter Model 725 is a portable battery operated power quality instrument The Model 725 com bines the simplicity and familiarity of digi tal clamp ons with today s critical infor mation on power quality and harmonics Operation is simple and direct Select Amps Volts AC or DC on the rotary dial connect ad measure The push of a but ton gives additional or more specific infor mation You can trouble shoot and mea sure power power quality and harmonics with the ease of using a digital clamp on simply safely and economically The Model 725 performs current and volt age measurements in True RMS as well as current and voltage in DC and pro vides immediate readings of Total Harmonic Distortion THD Individual Harmonic order Hdc and 1st through the 25th Distortion Factor DF Crest Factor CF and Peak of distorted cur rents and complex voltages It also gives the Min Max and Average measurement values so you can record for over 24 hours with an internal clock logging record time Frequency Hz can be mea sured through either the current or the voltage at any time for the fundamental as well as the individual harmonic orders The Model 725 incorporates True RMS electronics and Hall effect te
7. chnology to ensure accurate readings on distorted waveforms The Model 725 uses two bal anced Hall sensors to measure current The voltage and current inputs are fil tered amplified and sampled by a 12 bit analog to digital converter A 16 bit microprocessor assures all calculations including an FFT and recordings An 8 bit microprocessor assures the manage ment of the measurement functions the LCD and the EEPROM memory configu ration The user may select Auto Ranging or Manual Ranging AC or DC AC mea surements and even odd or odd only individual harmonics The Model 725 also provides percent Ripple for DC measure ments Crest Factor for half cycle peaks Transformer Harmonic Derating Factor THDF and K Factor The Smooth func tion provides a 3 second measurement average for stable readings and Hold locks a reading on the display The combination digital analog display gives measurements on a large 4 digit 10 000 display with a 31 segment bar graph to indicate trends and surges During harmonics measurements the primary secondary display format allows dual monitoring of measured values Other features include Auto Off to con serve battery power low battery indica tor battery voltage test for current battery status and a beeper for verification of control and MIN MAX capture Beyond the absolute product rugged ness and overall design qualities the Model 725 is built with GE Lexan and meets specific p
8. eferenced to the fundamental and DF total harmonics referenced to total RMS These parameters permit identification of harmonic sources and their magnitude The Model 725 may be set up to display both odd and even harmonics which nor mally cause the greatest concern in elec trical distribution systems The bar graph simultaneously displays the True RMS signal value in real time to indicate sud den variations During harmonics mea surements the dual screen mode simul taneously indicates harmonics informa tion and rotary switch selection on sepa rate screens TRANSFORMER EVALUATION Crest Factor Crest factor measure ments which can be performed on amps or volts AC may be sed to evaluate har monic content Measure the output volt age waveform of you UPS to verify that no flat topping of the waveform is occurring CF lt 1 414 K Factor K Factor information may be accessed in the harmonic mode while measuring AC current The K factor is essentialy an index of a transformer s ability to handle nonlinear load current without overheating Applying a K factor rated transformer helps ensure that dan gerous heating or transformer failure will not result due load currents rich in har monic content The K Factor may also be used to verify that a currently installed K Factor rated transformer is correctly loaded with nonlinear devices A typical rating for a transformer supplying power with a variable speed drive
9. hysical standards The Model 725 also meets or exceeds UL 1244 safety standards as well as IEC 1010 1 Category III for 600 V ratings The Model 725 is comfortable to hold compact and easy to maneuver in a crowded breaker panel or transformer Yet the hooked jaw design facilitates clamping and accommodates two 500 MCM conductors The high sensitivity Model 725 features another uncommon advantage by mea suring low input levels 300 mA and 50 mV permitting power quality measure ments on low power or idling equipment OPERATIONS amp FUNCTIONS CURRENT amp VOLTAGE The Model 725 performs current and voltage measurements in True RMS as well as current and voltage in DC Voltage and current measurements may be displayed as AC only or as AC DC indicating that the measurement includes the DC component Significant amounts of DC current in any distribution system can shorten the lives of transformers motors and switch mode power supplies DC is also useful for UPS battery mea surements and DC motor drive currents During DC measurements the Model 725 can be used to display the percent age of AC ripple in a DC signal HARMONIC DISTORTION Pressing the HARM push button in AC volts or AC amps accesses a range of harmonics information The 725 will dis play the amplitude or frequency of indi vidual harmonics the percentage of each referenced to the fundamental or to the total RMS as well as THD total har monics r
10. n 0 1 Basic Accuracy 1 to 10 5 R 2 cts gt 10 10 R 2 cts Display Digital Ripple Bar graph DC A or V Ripple Range 1 to 999 9 Resolution 0 1 Basic Accuracy 2 to 99 9 5 R 10 cts 100 to 999 9 5 R 2 cts Display Digital Ripple Bar graph DC A or V CREST FACTOR CF Range 1 00 to 10 00 Resolution 0 01 Minimum Input gt 5 V or gt 5A Accuracy 40 to 70 Hz 1 00 to 3 50 2 2 cts 3 51 to 5 99 5 2 cts 6 0 to 10 0 10 2 ctx Display Digital CF Bar graph TRMS A or V FREQUENCY HZ Range 0 5 Hz to 20 000 Hz Minimum Input 2 A or 2 V Accuracy 0 5 Hz to 999 9 Hz 0 1 R 2 cts 1000 Hz to 9999 Hz 0 2 R 2 cts 10 kHz to 20 kHz 0 5 2 cts Display Digital Hz Bar graph DC A or V TRMS A or V GENERAL SPECIFICATIONS Battery 4 x 1 5 V AA alkaline NEDA 15A IEC LR6 Life approx 40 hrs continuous use Dimensions 10 8 x 4 x 2 275 x 103 x 52 mm Weight 1 5 lbs 670 g Display Quadriplexed LCD dual digital display 10 mm 5 mm 4 digits 10 000 counts 31 segment bar graph Temperature Operating 0 to 90 RH to 40 C 75 RH 55 C Storage 0 to 95 RH Material Case Gray Lexan 920A UL 94 V2 Jaws Red Lexan 500R 10 fiberglass UL 94 VO LCD lens Crystal Lexan 920A UL 94 V1 Mechanical Envelope Protection IEC 529 IP 40 Drop Test IEC 1010 1m Vibration IEC 68 2 6 Shocks IEC 817 SAFETY Protection
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