"user manual"
Contents
1. oy integral time Start to integrate Integration Reset ended 5 When you need to suspend integral operation press the soft key corresponding to the Stop parameter to suspend integral operation 6 Press the soft key corresponding to the RESET parameter to reset the integral value and integral time The relationship diagram of start suspension and resetting of the integral operation status is shown below Auto Clear when ON is selected Copyright Itech Electronics Co Ltd 31 Auto stop Integral Integration Integral integration reset ended Startto integrate restart Start to s integration integrate integral value integral time CT eee ELELEE ee EE Pres Press Fress Press Press Press Press start stop start stop reset start reset key key key key key key key Auto Clear when OFF is selected Integratior Integral Auto stop Integral ended reset integratior reset gate Start to PRE integrate restart Start to integration integral integrate value integral time Press Press Press key stop start stop reset start End Copyright Itech Electronics Co Ltd 32 EGH Chapter VI Harmonic Measurement Function Chapter VI Harmonic Measurement Function This chapter describes the features and use of the harmonic measurement function of the IT9121 power meter in details 6 1 Basic Concepts With the 100kHZ bandwidth the IT2. Itech Electronics Co Ltd 5 how ECH Chapter I Introduction Status Bar icon Status description Over current protection icon this icon appears ele when over current occurs A Key Lock this icon appears when the keyboard is locked Remote Lock this icon appears in remote operation and then local keys fail This icon appears in remote network connection 1 7 Introduction of rear panels Schematic Diagram of Rear Panel of IT9121 Power Meter 100 240V A 50VA MAX 50 60H ce A 1 GPIB interface 2 Ethernet interface 3 USB Interface 4 RS232 interface 5 External synchronization signal interface 6 Power interface 7 External sensor interface 8 Voltage input terminal 9 Current input terminal Copyright Itech Electronics Co Ltd 6 A ECH Chapter II Measurement Conditions Chapter II Measurement Conditions This chapter describes details of relevant work to be finished before use of the IT9121 power meter 2 1 Setting of Measurement Range The appropriate measurement range voltage and current range must be set for accurate measurement The selected range is effective for different measurement modes such as waveform display integral measurement and harmonic measurement Operation steps 1 In the Meter interface Press the soft key corresponding to V RANGE or A RANGE and use the knob or A Y to select the voltage or current range 2 Press the Enter key to confirm th
3. This list is used for showing the voltage current active power reactive power phase and total Copyright Itech Electronics Co Ltd 34 EGH Chapter VI Harmonic Measurement Function harmonic distortion THD factor of different harmonics Harmonic lists can be displayed in the whole sequence odd sequence and even sequence Below is a whole sequence harmonic list harmonic Harmonic Vertical order parameters scroll bar V_AUTO 15 000V A_AUTO horizontal scroll bar Harmonic content this list is used for showing all harmonic contents of single order harmonics including the voltage current and power You can view other harmonic parameters by operating the Left Right key to turn pages In this case the line scroll bar and current page are shown in bright white circles Measurement parameters are described in the following table voltage and harmonic current Uk and fundamental wave U 1 I k and fundamental wavel 1 power power power Harmonic order list this LIST can show the data of one order to 50 order harmonic signals These data can be displayed in the whole sequence odd sequence and even sequence The rows which are not displayed 1 e single order harmonic data which are not displayed can be presented by operating the Up Down key In this case the row scroll bar and current page in displayed in bright blue bars Copyright Itech Electronics Co Ltd 35 EGH Chapter VI Harmonic Mea
4. of the corresponding value End 4 3 Setting of Trigger Configuration When you need to enable the trigger function you should select the trigger source trigger mode trigger slope and other trigger related configuration Detailed steps are as follows Operation steps 1 Press a to enter the waveform display interface 2 In the waveform display interface Press the soft key corresponding to the TIRG SET parameter to enter the trigger setting interface as shown below Auto u A Ext lode Slope i ti 3 Press the right soft key corresponding to the parameter to select the required trigger Upp Mod EM Norm Fi Fu t icf 5 configuration Source trigger source Copyright Itech Electronics Co Ltd 22 y EGH Chapter IV Waveform Display Function Mode trigger mode Slope trigger slope External trigger input Ext When the trigger source is set as Ext input the trigger signal into the external signal input interface Synchronous of the rear panel according to the following specifications Specification Interface type BNC interface Input level Minimum pulse width Trigger delay time Within lus 3 sampling cycles LL Nore When the voltage higher than 0 3 3V is applied on the external signal input interface Synchronous the instrument may be damaged Minimum pulse width refers to the width of the high or low trigger level at least lus Trigger delay time refers to
5. AC component End Copyright Itech Electronics Co Ltd 30 A ECH Chapter V Integral Operation Function 5 3 Integration When the integral measurement function is enabled you can keep the current integral information and carry out the following operations exit start and stop Specific steps are as follows Operation steps 1 Press Integ to enter the integral display interface 2 In the integral measurement display interface Press the soft key corresponding to the START parameter to start or recover integral operation The Start status and integral operation value are displayed in the interface 3 When you need to keep the current integral status and integral result you can press the soft key corresponding to the RUN HOLD parameter Then the current status of the integral result display and communication output will be kept no matter whether integral operation is running 4 When you need to continue to implement integral operation double press the soft key corresponding to the RUN HOLD parameter to exit the HOLD status The power meter will display the integral result after exiting the HOLD status The schematic diagram of display of the HOLD RUN integral result is shown below entry to hold entry to hold mode Escape mode Escape HOLD hold mode hold mode dotted line represents the integration result a ss i i i i l i l i i display value
6. Irms Imn Idc Irmn Iac P S and Q Ucf Icf and WPAV are calculated by operation of the averaged Urms Irms P and S Measurement function in harmonic measurement The following measurement functions are subject to direct averaging Data of the following measurement functions are obtained via operation in other modes and the obtained measurement function is affected averaging U k A k W k S k and Q k k is calculated via operation of the averaged W k and Q k U r A r W r U f A f and W f are calculated via operation of the averaged U k A k and W k k indicates the harmonic times NOTE When the averaging function is enabled the average of a number of measurements are calculated and displayed Therefore in case of drastic changes of the input signal the measured value will slowly affect these changes For both the attenuation constant of index averaging and the number of averaged values of linear averaging the larger the set value is the more stable the measured value is The following measurement functions will not be affected by averaging Conventional measurement functions Fu Fi Ipk Ipk Upk Upk Time WP WP WP q q q and Fsyn Harmonic measurement functions o k EUU K and oII K k indicates the harmonic times Copyright Itech Electronics Co Ltd 14 br ECH Chapter III Basic Measurement Functions Chapter III Basic Measurement Functions This ch
7. Routine Maintenance Introduce basic maintenance in daily use of equipment Such as cleaning self maintenance allowed to be performed by the user etc Equipment cleaning Use dry cloth or slightly wet cloth to gently wipe the equipment Do not arbitrarily wipe the inside of the instrument Cut off the power supply before cleaning Initialize When this operation is implemented the system settings are recovered to the factory default values 1 Select SYSTEM gt INITIAL in the Menu interface to enter the system initialization interface See the following figure 20 21 Please Press START to Start System Initial It lasts 2 seconds at most D 2 Select the menu items to be initialized blue symbol background via A V key Menu items with characters Y following should be initialized indicates that the items will not be initialized 3 Press the soft key corresponding to the symbol on the right of the interface to o ALL determine whether to initialize this menu item Or use the soft key Ea for initialization of all menu items or 5 no initialization for all menu items in the lower part of the interface 4 Press the START soft key to initialize system settings Press the ESC to exit End 7 4 Contact of ITECH Engineers This section describes operations to be carried out by the user in case of failure of the instrument Copyright Itech Electronics Co Ltd
8. Schematic Diagram of Front Panel of IT9121 Series Power Meter and Diagram of Key Functions l 2 3 4 5 6 7 8 Re 179121 DigitallPower Meter Menu i alibratio eee _y lnstructi 1 Pr 6 2 Pr Swi local mod 3 Press the perform ci 4 fi i M E N Li et j mfoperation select Cal zero to 4 13 12 11 10 9 1 USB Interface 2 Display 3 Menu key 4 Waveform Display key 5 Basic functions 6 Harmonic key 7 Integrator key 8 Setting knob 9 Arrow keys 10 Hold Esc key 11 Enter key 12 Image Save key 13 Parameter setting key 14 Menu key 15 Power switch 1 3 Introduction to keyboard The functions of keys on the front panel of the IT9121 series power meter are shown in the following table aww Waveform Display key When this key is pressed the waveform corresponding to current measurement data will be displayed Harmonic Measurement key When this key is pressed the harmonic measurement results and the menu of harmonic measurement parameter configuration will be displayed Basic Measurement key When this key is pressed the measurement data of various items will be displayed Integral Measurement key When this key is pressed the integral measurement results and the menu of integral measurement parameter configuration will be displayed Menu key used for setting relevant measurement parameters of
9. Setting of Measurement Int rval ss essssisse seeeteseenenmereeteseesesereeneteeetone 9 2 3 Seting Or Filter and Crest FaCtOr erein aE EEEE a 10 2A Setting of Averaging FUNCION serseri a a et 12 Chapter III Basic Measurement Functions sssssssecececcccssssseeecoocsssssceccccossececocosssssececeossssssssssee 15 MEE C016 a AA A N a TA ne A de 15 3 2 Setting of Measurement Function and Interface Display ccccccccceseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeees 16 Chapter IV Waveform Display Function cccccssssssssccccsssssssssssscccccccsssssssssccssssssssssssseees 19 Al BASIC C O P e EE EE E AOE 19 4 2 Adjustment of Measurement Parameters ccccccccccccccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeseeeeeseeeess 22 A gt DERDE OF Treger Oi OUT AL OM cessie a oree nE ENEE EANET iictanaueucaicaedetaductenmcasacdincauaueucetes 22 Chapter V Integral Operation Function siscesdcssvecssedscecessctercssiassecvenenssessictoscedeasescsassaceestessedessisees 24 BEE CONCOS esri aeie e EEEE RE EEE EE N ERER Eti 24 5 2 Setting of Integral Measurement Configuration 28 mo Ha E L E E A A ee ee A E A T AO E TA A A T 31 Chapter VI Harmonic Measurement Function eseeecccssssssececcccsssescecoccsssceecocosssssececeosssossssssee 33 EB CO EE ENE 33 6 2 Setting of Harmonic Measurement Configuration ire 36 Chapter VII Routine Maintenance ssssssseecccccssssssecececcossssscececoocssseceecoccs
10. approved The instrument complies with the WEEE Directive 2002 96 EC marking requirement This affix product label indicates that you must not discard the electrical electronic product in domestic household waste This symbol indicates the time period during which no hazardous or toxic substances are expected to leak or deteriorate during normal use The expected useful life of the product is 10 years The product can be used safely during the 10 year Environment Friendly Use Period EFUP Upon expiration of the EFUP the product must be immediately recycled 2002 96 EC Waste Electrical and Electronic Equipment WEEE Directive This product complies with the WEEE Directive 2002 96 EC marking requirement This affix product label indicates that you must not discard the electrical electronic product in domestic household waste Product Category With reference to the equipment classifications described in the Annex of the WEEE Directive this instrument is classified as a Monitoring and Control Instrument To return this unwanted instrument contact your nearest ITECH office Declarations of Compliance IT9120 Power Meter complies with the following EMC electromagnetic compatibility safety and environmental standards EC Declaration of Conformity EMC The instrument meets intent of EC Directive 2004 108 EC for electromagnetic compatibility EMC Compliance was demonstrated to the following specifications as
11. average active powerintegral Integral Start key In the manual start mode the integral function can be enabled by pressing the soft key corresponding to this parameter Integral Stop key In the manual stop mode the integral function can be disabled by pressing the soft key corresponding to this parameter Set relevant parameters of integral measurement Copyright Itech Electronics Co Ltd 25 Integral measurement display information In LAP e ENV VAUTO F F L F USB i 15 000V MANUAL_MANUAL 0000 00 00 A_ AUTO 1 0000A M WP RUN HOLD WP FUNC LARGE START STOP SETUP Uaa fm wP wr Description of measurement information Function description Mode Display the integral start and stop mode Start mode MANUAL and FE Stop mode MANUAL TIME and TINTerval State Display the current status of the integral function Start displayed when the integral function is working Stop displayed when the integral function is interrupted canceled or stopped Ready displayed in the ready state of the real time start mode Time Up displayed when it reaches the specified time of the integral timer Reset displayed when the integral value and integral time are reset via integral resetting Error when the power supply is recovered the integral function is stopped and the integral result before power failure is displayed This integral state is called Error state Display the set integral time Inte
12. calibrated to calibrated to the effective the effective value Q Reactive power Idc Average Average var current rectified value of voltage V S Apparent power Ipk Positive Average VA current peak voltage V value A Power factor Ipk Negative AC voltage current peak component value A p Phase difference Ipp Positive of voltage and peak to peak voltage peak current value A value V Fsyn Synchronization Current crest Negative source factor voltage peak frequency value V Irms Current effective Current Voltage value VA frequency peak to peak Hz value V a factor Irmn Voltage Average Urms rectified current effective A value VA frequency Hz 3 2 Setting of Measurement Function and Interface Display The power meter has three interface display styles for measurement of basic parameters At most five pages are displayed in each style When one or more important measurement parameter s should be highlighted the Viewl or View4 mode can be freely enabled to design the humane display style When you need to view all parameters at the same time in one interface the View12 mode can be enabled Take power measurement as an example The interface can display four parameters in the large font form effective voltage effective current active power and power factor Operating procedures are as below Operation steps 1 In the Meter interface when the soft key corresponding to VIEW
13. center vertical The trigger status is described as follows Trigger Instruction status Auto When the trigger mode is set as Auto the trigger status Auto will be displayed after triggering Auto When the trigger mode is set as Auto the trigger status will be Auto in the case of no triggering When the trigger mode is set as Normal the trigger status Trig will be displayed after triggering in the case of no triggering Stop When the Stop soft key in the waveform display interface is pressed the trigger status Stop will be displayed Copyright Itech Electronics Co Ltd 20 Vertical calibration When the crest factor CF is 3 the selected voltage range and current range will be subject to vertical calibration voltage grid current grid When CF is 6 the selected voltage range and current range will be subject to two time vertical calibration voltage grid current grid Horizontal calibration Trigger delay When the KNOB SEL soft key is pressed and T d is selected horizontal calibration scanning speed adjusted by rotating the knob In this case time grid information changes can be observed on the screen by rotating the knob and changing the horizontal time grid setting When acquisition is run the sampling rate can be changed by adjusting the horizontal calibration knob When acquisition is stopped sampling data can be amplified by adjusting the horizontal calibration knob When the KNO
14. errors may be caused 5 2 Setting of Integral Measurement Configuration You can set the start mode stop mode automatic zero setting automatic calibration watt hour integration current integration and other parameters of integral measurement Specific steps are as follows Operation steps 1 Press Integ to enter the integral measurement interface 2 Press the soft key corresponding to the SETUP parameter in the integral measurement interface to enter the integral parameter configuration interface Press the A Y key to select the required parameter as shown in the figure below LV ete 23 47 F F L F JSB MANUAL MANUAL MANUAL TIME OFF OFF Discharge AC 7 Parameter descriptions Start set in the MANUAL mode or TIME mode via the right soft key MANUAL press the START soft key in the integral measurement interface in the manual start mode to trigger the manual start of the integral function TIME the date on which the integral mode is started can be set in the real time start mode Integration will be started on the set date When the time date combination is set in the real time start mode integration will not be started before the current time and date Integration will be started when the screen is updated once at least before the start time Copyright Itech Electronics Co Ltd 28 A ECH Chapter V Integral Operation Function Stop set in the MANUAL mode TIME mode and TINTerval
15. mode via the right soft key MANUAL press the STOP soft key in theintegral measurement interface in the manual stop mode tomanually stop integration When the integration time reaches the maximum integration time 10 000 hours or the integral value reaches the maximum minimum display value integration will be stopped and the current integral time and integral value will be kept Integration ended Keep integral value Integral time 4 i 0 1 Li i a a 1 4 1 4 4 F E j1 a i 1r a i E ki i i Pd a i I fr e ae t a waimiaieimiaiadeied hs 1h FR FF Press Reset Start Reachofthe Reset Stop key max integral valueor integral time Start to integrate TIME The date for stop of the integral mode can be set in the real time stop mode Integration will be stopped on the set date When it reaches the set time or the integral value reaches the maximum minimum display integral value integration will be stopped and the current integral time and integral value will be kept Keep integral value Timer setting Keep i integral time Timer setting Start to Auto stop reset integrate TINTerval the integral measurement time can be set in the set time stop mode When it reaches the set ending date and time or the integral value reaches the Copyright Itech Electronics Co Ltd 29 A ECH Chapter V Integral Operation Function maximum minimum displa
16. the interface Menu gt SETUP gt OTHER SET ed LS ee Measurement range The crest factor can be set as 3 or 6 The crest factor can be measured under the following conditions Crest factor CF Measurement range x Set value of CF 3 or 6 Measured value effective value LL Nore The crest value of the input signal must be no more than the maximum allowable input value When the crest factor of the measured signal is larger than the crest factor in instrument specifications based on the crest value of rated input the signal with the crest factor larger than the specified value can be measured by setting a range including the value of the measured signal For example when CF is set as 3 but the measured value effective value is less than 60 of the range the signal with CF more than 5 can be measured When CF is 3 the signal with CF equal to 300 can be measured under minimum effective input 1 of the range conditions The voltage range current range effective input range and measurement accuracy depend on the set crest factor 2 4 Setting of Averaging Function The user can set the averaging function via this menu When the input signal frequency is low the value is displayed unstably and cannot be read easily In this case the averaging function can be enabled to calculate and display the average value of several measurements Operation steps 1 Select Menu gt SET UP gt AVERAG SET to enter
17. the operation system before connecting to the I O terminal e Do not use the instrument if the detachable cover is removed or loosen e Do not connect the instrument to any cable or terminal block before self testing e To prevent the possibility of accidental injuries be sure to use the power adapter supplied by the manufacturer only e Never use the instrument with a life support system or any other equipment subject to safety requirements CAUTION e Failure to use the instrument as directed by the manufacturer may render its protective features void e Always clean the casing with a dry cloth Do not clean the internals e Make sure the vent hole is always unblocked Environmental Conditions The instrument is designed for indoor use and an area with low condensation The table below shows the general environmental requirements for the instrument Environmental Conditions Requirements Operating temperature 5 C 40 C Operating humidity humidity 20 80 non condensation Storage temperature 20 C 50 C Altitude lt 2 000m Pollution degree Pollution degree 2 D ore To make accurate measurements allow the instrument to warm up for 30 min Copyright Itech Electronics Co Ltd il ES EGH IT9121 User s Manual Regulatory Markings The CE mark indicates that the product complies with all the relevant European legal directives The specific year if any affixed refers to the year when the design was
18. the value displayed after the nth index averaging D1 the value displayed after the first averaging is equal to M1 Dn 1 the value displayed after the n 1 th index averaging Mn the nth measured data K attenuation constant 1 64 Linear averaging D M ma tM M tM Computing formula m Dn the value displayed after linear averaging of m values from the n m 1 th to Copyright Itech Electronics Co Ltd 13 RIT EGH nth value Mn m 1 the n m 1 th measured data Mn 2 the n 2 th measured data Mn 1 the n 1 th measured data Chapter II Measurement Conditions Mn the nth measured data M the number of average values 1 64 When m can be divided exactly by n the calculated value is the moving average when there is no particular relationship between m and n the calculated value is the repeated average aa When index averaging is set averaging is implemented under the harmonic measurement function NOTE When linear averaging is set averaging can only be implemented in the conventional measurement function and this mode is not applicable to the harmonic measurement function Averaging function Measurement function in conventional measurement The following measurement functions are subject to direct averaging Data of the following measurement functions are obtained via operation in other modes and the obtained measurement function is affected averaging Urms Umn Udc Urmn Uac
19. to this parameter to set the current range parameter to run or stop the waveform status SINGLE Single measurement key when single measurement is performed under stop conditions the stop status will be enabled again after one measurement according to the current data updating rate When single measurement is performed under running conditions one measurement will be performed immediately by the instrument and then the stop status will be enabled SCOPE U A UA Select the waveform to be displayed on the screen voltage current voltage and current Copyright Itech Electronics Co Ltd 19 y EGH Chapter IV Waveform Display Function Parameter name Parameter descriptions KNOB SEL Knob selection the following variables can be adjusted U A TL TD Td by rotating the knob vertical voltage position vertical current position trigger level trigger delay level calibration Automatic adjustment key when the soft key corresponding to this parameter is pressed the power meter will automatically calibrate the input signal to display the best effect of the input signal TRIG SET Trigger setting MEASURE SET Measurement setting Introduction of waveform display interface Trigger V grid A grid Trigger Delay time Trigger level delay time grid state A_AUTO KNOB SEL TR MEASURE j a n T ma Ground The voltage current Trigger Measuring level difference between ground Jevyel parameters level and point of
20. warranty terms covering the materials in this document that conflict with these terms the warranty terms in the separate agreement shall prevail Technology Licenses The hardware and or software described herein are furnished under a license and may be used or copied only in accordance with the terms of such license Restricted Rights Legend U S Government Restricted Rights Software and technical data rights granted to the federal government include only those rights customarily provided to end user customers ITECH provides this customary commercial license in software and technical data pursuant to FAR 12 211 Technical Data and 12 212 Computer Software and for the Department of Defense DFARS 252 227 7015 Technical Data Commercial Items and DFARS 227 7202 3 Rights in Commercial Computer Software or Computer Software Documentation Copyright Itech Electronics Co Ltd Safety Notices CAUTION A CAUTION sign denotes a hazard It calls attention to an operating procedure or practice that if not correctly performed or adhered to could result in damage to the product or loss of important data Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met WARNING A WARNING sign denotes a hazard It calls attention to an operating procedure or practice that if not correctly performed or adhered to could result in personal injury or death Do not proceed be
21. 4 is pressed 10 measurement parameters can be displayed in total 4 of which are displayed in an amplified manner Other measurement parameters can be viewed by pressing lt gt key to turn pages as shown in the figure below Copyright Itech Electronics Co Ltd 16 Se ECH Chapter III Basic Measurement Functions tr PAA e V_AUTO F F L F USB 15 000V A AUTO RESET MAX HOLD CONFIG ON 2 When the soft key corresponding to CONFIG is pressed the measurement function can be selected and the interface display information can be set LA ete 03 17 F F LF USB j P 5 A Ipp DEFAULT INSERT DELETE PAGE PAGE 3 When the soft key corresponding to FUNC is pressed the measurement function can Q Fsyn ESC be selected For example when the FUNC key is pressed once the displayed measurement function will be switched once in the W A V sequence Different measurement parameters are displayed when different functions are selected As power measurement is taken as an example in this operation W is selected W power P Q S and Fsyn A current Irms Imn Irmn Idc Iac Ipk Ipk Ipp Icf Fi and Irush V voltage Urms Umn Urmn Udc Uac Upk Upk Upp Ucf and Fu 4 Press the V key and move the cursor to select the parameter displayed in the interface blue font background Press the right soft key corresponding to the parameter
22. 41 Preparation before contact When the instrument fails you should make the following preparations before returning the instrument to ITECH for repair or contacting engineers 1 Check all the items listed in the Self inspection of Equipment Faults and confirm whether there are still some problems 2 If there are still some problems carefully read the contents of warranty services and warranty restrictions in the preface of the manual Confirm that our instrument complies with warranty service conditions 3 If you want to send the instrument to the manufacturer for repair refer to instructions in tte ARES AVR End Self inspection of equipment faults In case of failure of the instrument self inspect the following items If the instrument failure can be eliminated via simple inspection the maintenance cost and time can be saved Please check the following items before contacting the engineer of ITECH Check whether the power meter is powered up Check whether the power meter is started normally Check whether the instrument fuse is in good conditions Check whether other connectors are in good conditions and whether cables plugs and other parts are connected properly Check whether the system configuration of the instrument is correct during use Check whether self inspection of the instrument is successful and whether the specifications and performance are within the indicator ranges Check whether the
23. 6 6 This specification C is applied to 70 voltage drop in 25 cycles and 0 voltage interruption in 250 cycles subject to IEC 61000 4 11 Copyright Itech Electronics Co Ltd iv ES EGH IT9121 User s Manual TableofContents Quality Certification and Assurance ii iiiiiiiieseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeenes l WV AM ANY r E E E E A E E E E E cud sotensese weet l Limitation of Warranty AZ l SER DOS A E a a T EE A A A E ce ot l S ea Ano IELA I EEI E E E E E E ead Gnaeeney 2 Environmental SONS saser coarsest a DO et oO eeegeeeeeeacs 2 Boado Mark S a E E E E E eee ree ee 3 Waste Electrical and Electronic Equiment WEEE Directive 3 Declarations OL COMPDHANC see ce EEE E eee ee 3 Chiper MN L LE 010 LITE 0 1 PP PR ER Reese 1 11 Brief GO LOS C0 et eanssiceese es atewns Ghat nesncnenctaaeto E E l 1 2 Introduction of front panels 2 ES AOC TO LORS DO a asp acusaied acta toes ec sons asa esc esses 2 1 4 Introduction of Menu Function ccccccccccccceccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeees 3 1 5 Introduction of Interface Display Information 5 1 6 Introduction of Interface Symboli sicuris a e A AEE R E A 5 1 7 latroduction 0f Tear paneis osise e a D en 6 Chapter IL Measurement Conditions sis ists tsstisecansssivessaneniacisesssndixesetesisceliusussoucsiesssiecsnistisstnseeliernats 7 2 1 Setting of Measurement Range occa ace dede ane dense een D de ton te D een 7 2 2
24. 8 A ECH Chapter II Measurement Conditions D vor During measurement of the distortion waveform and other non sinusoidal wave signals the accuracy of measurement can be improved by selecting the minimum range on the premise that the measured value does not exceed the range Auto measuring span The range is switched automatically according to the input signal The range types for switching are the same as those of the fixed range Principles of automatic range level increase The range level is increased when any one of the following conditions is satisfied Urms or Irms exceeds 110 of the current range setting The crest factor is 3 The value Upk or Ipk of the input signal exceeds 330 of the current range setting The crest factor is 6 The value Upk or Ipk of the input signal exceeds 660 of the current range setting Principles of automatic range level decrease The range level is decreased when all of the following conditions are satisfied Urms or Irms is less than or equal to 30 of the current measurement range The crest factor is 3 The value Upk or Ipk of the input signal is less than 300 of the range at the following level The crest factor is 6 The value Upk or Ipk of the input signal is less than 600 of the range at the following level D vor The selected automatic range may change when the input waveform is a pulse waveform of uncertain cycle In this case the fixed range should be sele
25. 9121 power meter can realize harmonic measurement of high speed and wide dynamic range The voltage current active power reactive power and phase of harmonics and total harmonic distortion THD factor can be tested in the harmonic mode In addition the IT9121 power meter can be used for multiple harmonic measurements 50 order harmonics of the fundamental frequency at most The IT9121 power meter displays harmonic parameters in the list or bar chart form so as to provide clear analysis of test results Introduction of soft keys on the interface Select the lt MA button and the initial harmonic measurement interface below will appear r tan e V_AUTO F F L F USB 15 000V A AUTO RUN HOLD l D AL 5 5 F HH a5 5 5 ZE 25 ci 25 dk 45 Si Description of information of harmonic measurement interface name parameter to set the voltage range parameter to set the current range RUN HOLD press the soft key corresponding to this parameter to run hold the harmonic status Reset Copyright Itech Electronics Co Ltd 33 EGH Chapter VI Harmonic Measurement Function Introduction of harmonic information Description of harmonic bar chart interface When the BAR button is selected in the harmonic measurement interface the bar chart of harmonic measurement results will be displayed The bar chart is used for displaying the percentage of different harmonics Harmonics can be displaye
26. B SEL soft key is pressed and TD is selected the trigger delay can be adjusted by rotating the knob In this case when the knob is rotated the trigger point will move horizontally and the delay time will be displayed on the screen When the delay time is changed the trigger point will move horizontally and the distance between the trigger point and the horizontal center will be indicated The trigger point is displayed along the top of the display grid Trigger waveform When the specified trigger conditions are satisfied the trigger waveform will be displayed and the triggering time point is called trigger point The trigger point is generally displayed in the left of the display screen Following the trigger point the waveform is displayed on the display screen from left to right over time Before using the trigger function the user needs to configure the following parameters Trigger mode The trigger mode refers to conditions for updating the contents displayed on the screen Including the Auto model and Normal mode Auto mode the displayed waveform is updated in case of triggering in the pause time and automatically updated in case of no triggering in the pause time Normal mode the displayed content is updated in case of triggering and not updated in case of no triggering Trigger source The trigger source is used for generating triggering conditions The user can select the trigger source from the input signal
27. apter describes the features and use of the basic measurement functions of the IT9121 power meter in details 3 1 Basic Concepts The IT9121 power meter has rich basic power measurement functions and can be used for accurately measuring the voltage current power AC DC signal power factor harmonics frequency distortion factor and other parameters The reliable data can provide a scientific basis for analysis of the power quality and performance of equipment Introduction of soft keys on the interface Ss ete V AUTO 15 000V Urms A AUTO 5 0000mA M HOLD RESET MAX HOLD ey FIG OFF on Instruction Set the voltage range Set the current range Running holding immediately carry out measurement again View 1 displaying large value and 6 small values VIEW 4 View 4 displaying 4 large value and 6 small values VIEW 12 View 2 displaying 12 large values MAXHOLD Maximum value holding OFF ON the maximum value OFF ON MAX of data can be held CONFIG Measured parameters Parameters Parameter Parameters Parameter Parameters Parameter descriptions descriptions descriptions Copyright Itech Electronics Co Ltd 15 dE ECH Chapter III Basic Measurement Functions Parameters Parameter Parameters Parameter Parameters Parameter descriptions descriptions descriptions P Active power Average Average W rectified value rectified value after the after the current 1S voltage IS
28. cluding but not limited to lightning moisture fire improper use or negligence Safety Symbols AT Both direct and alternating Power on state current Protective earth ground Power off state terminal Earth ground terminal Reference terminal Caution Positive terminal Warning refer to this manual for Negative terminal specific Warning or Caution information A chassis terminal Copyright Itech Electronics Co Ltd i ES EGH IT9121 User s Manual Safety Precautions The following safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or specific warnings elsewhere in this manual will constitute a default under safety standards of design manufacture and intended use of the instrument ITECH assumes no liability for the customer s failure to comply with these precautions WARNING e Do not use the instrument if it is damaged Before operation check the casing to see whether it cracks or 1s not applied with sufficient plastics Do not operate the instrument in the presence of inflammable gasses vapors or dusts e The maximum operating voltage and current of the instrument are 600V and 20A respectively Exceeding these limits will lead to burnout of the instrument e Make sure to use the power cord supplied by ITECH e Check all marks on the instrument before connecting the instrument to power supply e Turn off the instrument and
29. cted 2 2 Setting of Measurement Interval The time for acquisition of sampling data is determined by the measurement interval during measurement The measurement interval is determined by the data updating rate and synchronization source The synchronization source provides reference signals for measurement and the data updating rate determines the updating cycle of sampling data Measurement interval The measurement interval is determined by the data updating rate and synchronization source see 2 3 Setting of Filter and Crest Factor for specific settings Synchronization IT9121 adopts the frequency measurement circuit to test the input signal cycle set in the measurement interval The measurement interval is the integer times of the test cycle The measured value of IT9121 is calculated by averaging sampling data in the measurement interval The reference input signal used for defining the input signal measurement interval is called the synchronization source Measurement interval for conventional measurement The measurement interval of the reference input signal is the time from the starting part of the rising slope or descending slope through the zero point Copyright Itech Electronics Co Ltd 9 A ECH Chapter II Measurement Conditions intermediate value of amplitude to the ending point of the rising slope or descending slope through the zero point intermediate value of amplitude However the measureme
30. d in the whole sequence odd sequence and even sequence The following is the whole sequence harmonic bar chart Y axis percentage Parameters of of harmonic THD value each harmonic x axis harmonic numbers Bar graph Description of interface information Total harmonic parameter including the total harmonic distortion THD factor and total harmonic content When different measurement functions are selected different harmonic parameters will be displayed When the soft key corresponding to the FUNC parameter is pressed different measurement functions can be selected W A U can be selected as the measurement function in sequence when this key is pressed once Parameter meanings of different functions are as follows Power W total harmonic distortion rate of power and total harmonic power Current A total harmonic distortion rate of current and total harmonic current Voltage U total harmonic distortion rate of voltage and total harmonic voltage Single order harmonic parameters displaying the frequency harmonic content harmonic distortion factor and phase of single order harmonics The user can rotate the knob to select the single order harmonics to be displayed The selected harmonics are displayed in red in the bar chart form Description of harmonic list interface When the LIST button is selected in the harmonic measurement interface the list of harmonic measurement results will be displayed
31. e setting The instrument will automatically confirm and exit the setting in case of no operation on the interface for more than 5s When the crest factor is 6 Figure Voltage Range nr PAA es PT V AUTO F F L F USB Aulo 7 500V A_AUTO MAX HOLD CONFIG ON Figure Current Range F F LF USB A_AUTO 2 5000mA M MAX HOLD CONFIG Wid on Copyright Itech Electronics Co Ltd 7 A ECH Chapter II Measurement Conditions When the crest factor is 3 Figure Voltage Range ar A lee V_AUTO F F Le USB 15 000V A AUTO MAX HOLD CONFIG ON Figure Current Range nr LAR ee V_ AUTO F F L F USB l 15 000V A AUTO MAX HOLD CONFIG ON D vor When EX1 or EX2 is installed the power meter has more current range options See details in IT9121 Installation Instructions Voltage and current range Set the measurement range according to the level of the effective value When the voltage or current signal is input into the input unit there are two types of range fixed and automatic Fixed range Select the required range from a number of options After selection the range will not change with the input signal For the voltage range when the crest factor is 3 the maximum option is 600V and the minimum option is 15V When the crest factor is 6 the maximum option is 300V and the minimum option is 7 5V Copyright Itech Electronics Co Ltd
32. en this key is pressed the capture interval of the voltage current power and other data 1 e data updating rate can be set When the data updating rate is increased rapid load changes of the power system can be obtained When the data updating rate is decreased relative low frequency signals can be measured Options of the data updating rate 0 1s 0 25s 0 5s 1s 2s 5s 3 Press the Enter key to save the settings Frequency filter it 1s inserted in the frequency measurement circuit and may affect frequency measurement It can be used for filtering high frequency components of interference to make the measured frequency parameter more accurate When the frequency filter is switched on the voltage or current of no more than 200Hz can be measured The cutoff frequency is 500HZ Line filter it is inserted in the voltage and current measurement circuit and has direct influence on measurement of the voltage current and power When the line filter is switched on noise and high frequency components from the inverter or distortion waveform can be filtered The cutoff frequency is S0O0HZ Copyright Itech Electronics Co Ltd 11 hae ECH Chapter II Measurement Conditions Crest factor The crest factor is the ratio of the waveform peak to the effective value The crest factor of IT9121 is specified as the times of the crest value which can be input under the rated input conditions The crest factor CF3 or CF6 can be selected in
33. ency of PLL Window width pper Rae analysis orders 10Hz 75Hz f 1024 75 Hz 150 Hz f 512 150 Hz 300 Hz 256 300 Hz 600 Hz 128 ES 600 Hz 1200 Hz The upper limit of analysis orders can be reduced LCI NOTE If the analysis window determined by the fundamental wave frequency of the PLL source is longer than the data updating cycle no harmonic data will be detected In this case the data updating cycle should be reduced For example when the fundamental wave frequency of the PLL source is 10Hz cycle 100ms the analysis window is one wave long and the data measurement interval is 100ms In this case the harmonic measurement time is approximately more than or equal to 150ms data measurement interval and data processing time Therefore please select the data updating rate of 250ms or more for measurement and display of harmonic data End Copyright Itech Electronics Co Ltd 38 A ECH Chapter VII Routine Maintenance Chapter VII Routine Maintenance This chapter describes general maintenance items and maintenance methods of the IT9121 power meter 7 1 Self inspection The IT9121 power meter has a self inspection function See Power on Self Test of Chapter 3 Inspecting the Instrument of IT9121 Installation Instructions for detailed steps of self inspection 7 2 Error Information References The IT9121 power meter has a detailed error and prompt information function so as to help the u
34. gral operation Active power integral In watt hour displayed as WP watt hours the sum of positive and negative watt hours WP the consumption of positive watt hours and WP the negative watt hours of feedback power Current integral In q displayed as q ampere hours the sum of positive and negative ampere hours q the consumption of positive ampere hours and q the negative ampere hours of feedback power Average active power integral Copyright Itech Electronics Co Ltd 26 A ECH Chapter V Integral Operation Function In watt displayed as WPAV average active power integral Integration time Displayed as Time in the format of hhhh mm ss Specification Save in case of power failure The integral result can be kept in the memory even in case of power failure during operation of the integral function When the power supply is recovered and the integral function is disabled the integral result before power failure is displayed When the power supply is recovered and the integral is rest the integral function is enabled again Display resolution The maximum display resolution of the integral value is 99999 When the integral value reaches 100000 the decimal point will move automatically For example when 0 01mwh is added to 999 99mwh 1 0000wh will be displayed Display in case of overflow When the integral value meets the following overflow conditions the integral function wi
35. heel T ECH Power meter IT9121 Series User Guide Model IT9121 kel EGH Notices ItechElectronics Co Ltd 2014 No part of this manual may be reproduced in any form or by any means including electronic storage and retrieval or translation into a foreign language without prior permission and written consent from Itech Electronics Co Ltd as governed by international copyright laws Manual Part Number IT9121 402145 Revision 1 Edition November 12 2014 Itech Electronics Co Ltd Trademarks Pentium is U S registered trademarks of Intel Corporation Microsoft Visual Studio Windows and MS Windows are registered trademarks of Microsoft Corporation in the United States and or other countries and regions Warranty The materials contained in this document are provided as is and is subject to change without prior notice in future editions Further to the maximum extent permitted by applicable laws ITECH disclaims all warrants either express or implied with regard to this manual and any information contained herein including but not limited to the implied warranties of merchantability and fitness for a particular purpose ITECH shall not be held liable for errors or for incidental or indirect damages in connection with the furnishing use or application of this document or of any information contained herein Should ITECh and the user enter into a separate written agreement with
36. ic measurement is determined automatically by the signal cycle set as the PLL source in the instrument The sampling data or measurement interval for calculation may be different from the sampling data or measurement interval of the measurement function in conventional measurement 2 3 Setting of Filter and Crest Factor Operation steps 1 Select Menu gt SET UP gt OTHER SET and enter the OTHER configuration page 2 Press A Y to select the parameter to be configured blue font background and then Copyright Itech Electronics Co Ltd 10 keel TECH press the soft key corresponding to the parameter on the right to set the required value as Filter Chapter II Measurement Conditions shown in the following diagram Ie AA lt F F L F USB AVERAG EXT SEN OTHER INRUSH SET SET o set SET Freq Filter Crest Factor Update Rate Function description Select the synchronization source U I OFF The overall interval of the signal voltage current or data updating cycle can be selected as the synchronization source for measurement Set the status of the frequency filter When ON is selected the frequency filter is turned on When OFF is selected the frequency filter is turned off Set the status of theline filter When ON is selected the line filter is turned on When OFF is selected the line filter is turned off Set the crest factor CF3 CF6 Data Updating Rate Setting key wh
37. instrument displays error information Use other instruments instead of this instrument for confirmation Collect the SN number ITECH will constantly improve the product performance availability and reliability The service personnel of ITECH will record changes of each instrument All relevant information are marked uniquely according to the serial number of each instrument The equipment returned for repair must adopt the SN number as the tracking ID When you contact the engineer the effective SN number of the instrument will be the effective guarantee for effective service and complete information You can obtain the SN number of the instrument by the following ways 1 Press the Menu key to enter the system setting page of the power meter 2 Press the SYSTEM to enter SYSTEM INFO interface to view the product model product SN software version number and other information Copyright Itech Electronics Co Ltd 42
38. ion of the distortion factor r using all harmonic measurement data from the minimum harmonic order 0 to the maximum harmonic order within the upper limit of analysis orders as the denominator Copyright Itech Electronics Co Ltd 36 EGH Chapter VI Harmonic Measurement Function f using the data of fundamental wave 1 order components as the denominator The distortion factor calculation formulas and methods of different measurement functions are as follows Calculation formula and method a a Harmonic distortion U k U k factor of voltage U Total u i Harmonic distortion I k k factor of current I Total 1 Harmonic distortion factor of active power Total harmonic distortion max rate of voltage 2y k k 2 U Total Total harmonic distortion max rate of current D I k k 2 I Total Total harmonic distortion rate of active power P Total LO vorr Total harmonics are calculated as follows U Total gt U k y I Total gt I k y k 0 k 0 P Total D P k k indicates the harmonic order and max indicates the upper limit of analysis k 0 orders max is determined by the frequency of PLL source automatically 50 orders at most PLL source In the harmonic mode IT9121 adopts PLL to multiply the frequency of the input signal The frequency multiplication output signal is used as the A D sampling clock in the instrument so as to achieve the purpose of synchronous
39. listed in the Official Journal of the European Communities EN 61326 1 2006 Electrical equipment for measurement control and laboratory use EMC requirements e CISPR 11 2003 Radiated and conducted emissions Group 1 Class A e JEC 61000 4 2 2001 Electrostatic discharge immunity e IEC 61000 4 3 2002 Radiofrequency electromagnetic field immunity Copyright Itech Electronics Co Ltd iii ES EGH IT9121 User s Manual e IEC 61000 4 4 2004 Electrical fast transient burst immunity e JEC 61000 4 5 2001 Power line surge immunity e JEC 61000 4 6 2003 Immunity to conducted disturbances induced by radiofrequency e IEC 61000 4 11 2004 voltage dips short interruptions and voltage variations immunity EN 61000 3 2 2006 Harmonic emission on AC power line EN 61000 3 3 1995 Voltage change fluctuation and flicker 1 The product is intended for use in non residential non domestic environments Use of the product in residential domestic environments may cause electromagnetic interference 2 Connection of the instrument to a test object may produce radiations beyond the specified limit 3 Use high performance shielded interface cable to ensure conformity with the EMC standards listed above 4 Trace bloom not exceeding 4 divisions pk to pk may be induced under the test conditions specified in IEC 61000 4 3 5 Trace bloom not exceeding 1 division pk to pk may be induced under the test conditions specified in IEC 61000 4
40. ll be disabled and the integral time and integral value at this point will be kept The integral time reaches the maximum value 10000 hours The integral values of WP q and WPAV reach the maximum minimum display integral values Maximum minimum display integral value Active power integral WP 99999 Mwh Current integral q 99999 MAh Average power integral WPAV 99999 Mw Restricted implementation Settings of the following functions cannot be changed during integral operation Integration status status interruption Functions related to settings of measurement parameters Wiring Unenforceable Measurement range Unenforceable Filter Unenforceable Averaging function Unenforceable Synchronization Unenforceable Data updating rate Unenforceable Integral function parameter setting Integral mode Unenforceable Integral timer Unenforceable Integral operation Integral start Executable Integral stop Unenforceable Integral resetting Executable Other operations Executable Executable Copyright Itech Electronics Co Ltd 27 A ECH Chapter V Integral Operation Function Integration status Function Integral resetting Current integral Integral status interruption Single measurement Executable Executable Executable operation LL Nore In addition to the above items other settings such as self testing and date time setting or operations with influence on the integral cannot be executed otherwise
41. nge switching can be eliminated and the power consumption of household appliances can be measured more accurately See the schematic diagram below variable input signal l Ordinary i L range switch ower meter l p Swtich the ended l range gradually l l IT9121 power rangeswitch ended meter Switch to the next selected range Introduction of soft keys on the interface When the Integ button is pressed the initial integral measurement interface below will appear Copyright Itech Electronics Co Ltd 24 A ECH Chapter V Integral Operation Function nr Ale F F L F USB MANUAL MANUAL 0000 00 00 WP LARGE START STOP SETUP MEA WP We Description of information of integral measurement interface Parameter descriptions this parameter to set the voltage range aan this parameter to set the current range to run or hold the integral function Reset Selection of the integral function active power integral W current integral q and average active power integral AV LARGE WP WP WP Selection of the item to be displayed in a amplified manner q qt q WPAV WP watt hour the sum of positive and minus watt hours WP the consumption of positive watt hours WP the negative watt hours of feedback power q ampere hour the sum of positive and negative ampere hours q the consumption of positive ampere hours q the negative ampere hours of feedback power and WPAV
42. nt interval which determines the maximum voltage or current is Within the overall data updating cycle Therefore the measurement of Ipk Ipk Upk Upk Ucf and Icf calculated based on the maximum voltage and current also adopts the data updating cycle as the measurement interval The rising or descending edge is selected automatically to prolong the measurement interval Ifthere is only one or no rising slope or descending slope within the data updating cycle the data updating cycle is taken as the measurement interval The input signal to be used as the synchronization source can be set in each unit for synchronization with the zero point of that input signal The overall interval of the signal voltage current or data updating cycle can be selected as the synchronization source for measurement Data Updating Cycle Measurement Interval Sync source y Data Updating Cycle Measurement Interval D vor The data updating cycle refers to the cycle used for calculating sampling data of the measurement function It is identical to the set value of the data updating rate The slope refers to signal changes from low level to high level rising edge or from high level to low level descending edge Measurement interval for harmonic measurement At the sampling frequency of harmonic measurement the measurement interval refers to the first point 1024 from the data updating cycle The sampling frequency of harmon
43. nt system information COMM CONFIG Communication cowmconnG USB TypeB Connect B Connect Type B Connect Select the USB communication interface IP address setting LAN SYSTEM CONFIG System configuration Date YY MM DD System date Year Month Day Copyright Itech Electronics Co Ltd 3 ECH Chapter I Introduction Time hh mm ss System time Hour Minute Second Set the screen brightness Set the keyboard sound Self test Brightness Beep SELF TEST SYSTEM SELF TEST INITIAL SYSTEM INITIAL Self test Initialize System initialization Configuration SETUP INFO information Average Averag Sync Source Synchronization Line Filter Line filter Update Rate Data updating rate Freq Filter Frequency filter Crest Factor Crest factor External current sensor 1 range CF 3 2 5V 5V 10V CF 6 1 25V 2 5V 5V External current sensor 2 range CF 3 50mV 100mV 200mV 500mV 1V 2V ExSensorl ExSensor2 CE 6 25 mV 50mV 100m V 250mV 0 5V 1V Rate V A Conversion ratio of external current sensor Rate mV A Conversion ratio of external current sensor V Range Voltage range NO lt Un ne lt SNe A Range Current range SETUP Average function AVERAG SET setting State Mode Type Count EXT SEN SET Status Mode Loading Type Counting cycle External current sensor setting Set the external current sensor 1 ON OFF Set the conversion ratio of
44. of the input unit and the external clock signal Trigger slope The slope refers to signal changes from low level to high level rising edge or from high level to low level descending edge When used as a triggering condition the slope is called trigger slope Trigger level Level of trigger slope triggering occurs when the level of the signal of the trigger source reaches the set trigger level under the specified trigger slope conditions When the KNOB SEL soft key is pressed and TL is selected the trigger level Copyright Itech Electronics Co Ltd 21 y EGH Chapter IV Waveform Display Function can be adjusted by rotating the knob In this case the trigger level can be changed by rotating the knob and changes in the trigger level can be observed on the screen 4 2 Adjustment of Measurement Parameters You can rotate the knob to adjust the vertical calibration horizontal calibration trigger delay and trigger level of the waveform display interface Detailed steps are as follows Operation steps 1 Press a ie to enter the waveform display interface 2 In the waveform display interface Press the soft key corresponding to the KNOB SEL parameter and select the parameter to be adjusted When KNOB SEL is pressed once the parameter to be adjusted via the knob will be switched in sequence among U A TL TD Td 3 When the parameter is adjusted by rotating the knob the interface will display changes
45. on and can measure 50 order harmonic components at most With the interface for USB peripherals the user can store the interface in the external storage medium With many powerful integral functions the bought sold electricity can be calculated Frequency measurement function Built in USB GPIB RS232 and LAN communication interfaces Application advantages Analysis of UPS power quality As an important backup power supply in the communication industry the steady state characteristics dynamic characteristics power quality and other parameters of UPS should be analyzed With internal nonlinear elements the UPS power supply will generate a large number of harmonic components during operation which may affect operation of the communication system The IT9121 power meter can measure such parameters as the AC DC signal power factor harmonics frequency and distortion factor and systematically and comprehensively analyze the performance of the UPS power supply Test of performance of household appliances With promotion of the concept of using energy in a rational and environmentally friendly manner more and more household appliances adopt the variable frequency control technology to reduce the power consumption The IT9121 power meter can measure the inrush current active power crest factor etc Copyright Itech Electronics Co Ltd 1 keel TECH 1 2 Introduction of front panels Chapter I Introduction
46. sampling Therefore the frequency of the signal of the PLL source can determine the A D sampling clock in the instrument However the quality of the signal of the PLL source may affect the stability and accuracy of sampling data PLL source selection The voltage or current of the input unit can be selected as the PLL source Used for determining the fundamental wave cycle as the reference for analysis of harmonic orders The fundamental wave frequency of the PLL source is 10Hz to 1 2kHz Considerations for selection of PLL source Please select the signal with the same cycle as that of the harmonic measurement object signal In order to stably measure harmonics select the input signal with little distortion as the PLL source If the fundamental wave frequency of the PLL source changes or the fundamental wave frequency cannot be measured as a result of Copyright Itech Electronics Co Ltd 37 EGH Chapter VI Harmonic Measurement Function waveform distortion accurate measurement results may not be obtained When the test object is a switch type power supply and the voltage signal is subject to less distortion than the current signal it is recommended to use the voltage as the PLL source Signal level of PLL source If the amplitude level of the signal input into the unit as the PLL source is small relative to the range synchronization with PLL will fail If the crest factor is set as 3 the amplitude level of the PLL so
47. ser to easily carry out positioning and measurement during measurement and use This section describes all error information of the IT9121 power meter as well as error causes and disposals All prompt information is listed Prompt Message List Prompt information Explanation of prompt information Cal Zero is working The instrument is calibrating the zero point Cal Zero is completed The instrument has completed zero point calibration Not used in current state Scope Initialization Initialization of the oscilloscope function Harmonic Initialization Initialization of the harmonic function Inrush Initialization Initialization of the inrush function Copyright Itech Electronics Co Ltd 39 A ECH Chapter VII Routine Maintenance Error information list Error information Error information explanation usb is not detected Error description No USB peripheral is found Possible cause No USB peripheral is inserted Disposal Insert the U disc type USB peripheral and then copy the screen Save screen fail Error description The screen is not saved successfully Possible cause USB is disconnected Disposal Reinsert the USB peripheral Start time is less than current Error description The start time is less than the current time Possible cause The integral setting is incorrect Disposal Reset the integral start time End time is less than current Error description The ending time is less than the current time Pos
48. sible cause The integral setting is incorrect Disposal Reset the integral ending time Timer must be larger than zero Error description The set time must be larger than zero Possible cause The set integral time is not correct Disposal Reset the set integral time Harmonic open fail Error description The harmonic function cannot be enabled Possible cause Communication abnormality Disposal Check the communication cable Integ open fail Error description The integral function cannot be enabled Possible cause Communication abnormality Disposal Check the communication cable Integ start fail Error description The integral function cannot be started Possible cause Communication abnormality Disposal Check the communication cable Integ stop fail Error description The integral function cannot be stopped Possible cause Communication abnormality Disposal Check the communication cable Scope openfail Error description The oscilloscope function cannot be enabled Possible cause Communication abnormality Disposal Check the communication cable Time set fail Error description Time setting fails Possible cause Time setting 1s illegal Disposal Reset the system time Cal zero fail Error description Zero calibration fails Possible cause Communication abnormality Disposal Check the communication cable Copyright Itech Electronics Co Ltd 40 kel TECH 7 3 Daily maintenance Chapter VII
49. sseececcossssssceeeossssssssssee 39 TA o I D COR EE E E E E EE 39 7 2 Error Information References ccccccccccceceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeees 39 Fo A LUE NA E r E e a E A E E E 41 TA Gro nice wey ao L GER ERE ERE EERE eet ee eee ee 4 Copyright Itech Electronics Co Ltd Vv Chapter I Introduction 1 1 Brief Introduction Features The IT9121 power meter can provide the maximum input of 600 Vrms and 20Arms and the measurement bandwidth of 100KHZ and thus can be easily used for measuring the parametersincluding voltage current power frequency and harmonics Standard configuration includes USB GPIB RS232 and LAN communication interfaces and also the interface for USB peripherals The user can store the measured parameters in the external storage medium The voltage and current precision is 0 1 The instrument also has many integral functions such as the active power The product can be widely applied in motors household appliances UPS and other test fields 4 3 inch color liquid crystal display TFT The number of matrix columns to be displayed on the screen and the commonly used measurement parameters can be set freely Input range 600Vrms 20Arms The voltage current power harmonics and other parameters can be measured at the same time The precision of voltage and current measurement is up to 0 1 It has the harmonic measuring functi
50. surement Function 6 2 Setting of Harmonic Measurement Configuration You can set the distortion factor calculation formula PLL source harmonic sequence and harmonic analysis times of harmonic measurement Specific steps are as follows Operation steps 1 Press Hii to enter the harmonic measurement interface 2 Press the soft key corresponding to the SETUP parameter in the harmonic measurement display interface to enter the harmonic parameter configuration interface Press the A Y key to select the required parameter as shown in the figure below tr AN ie FF LF USB Parameter descriptions Parameters Instruction THD Formal Distortion factor calculation formula r displaying harmonics in the form of percentage to the overall current voltage power amplitude of all harmonics f displaying harmonics in the form of percentage to the fundamental wave current voltage power PLL Source Select the PLL Phase Locked Loop source U I OFF Used for determining the fundamental wave cycle as the reference for analysis of harmonic orders Serial Harmonic sequence whole sequence odd sequence even sequences Order Max Set the harmonic analysis orders 1 50 You can specify the harmonic measurement range These specified analysis orders are used for calculating the value of the distortion factor Distortion factor calculation formula The following two formulas can be selected for calculat
51. the power meter Enter key used for saving the settings Image Save key Cancel ESC key The front panel keyboard can be locked unlocked when the ESC key is constantly pressed for 5s The remote control mode of the power meter can be switched to the panel operation mode when the ESC key is constantly pressed for 5s Copyright Itech Electronics Co Ltd 2 Ne ECH Chapter I Introduction Key tag Name and function Up Down key and Left Right key List Edit those lines which are not displayed can be displayed by operating the Left Right key Those rows which are not displayed can be displayed by operating the Up Down key Menu Edit the programming items can be rolled by operating the Up Down key Prompts of corresponding options are displayed on the right and options can be selected via the soft key Digit Edit the programming items can be rolled by operating the Up Down key The digit to be edited is selected by operating the Left Right key or via the knob Carrying can be completed automatically Soft key The contents on the left of the key and the menu function displayed above the key on the display screen may be subject to changes Knob key used for setting the value indicated by the cursor selecting the voltage and current range adjusting the waveform etc 1 4 Introduction of Menu Function Press this key to enter the system menu function Menu 1s described as follows Menu setting SYSTEM INFO Instrume
52. the configuration page of the averaging function 2 Press A Y to select the parameter to be configured blue font background and then press the soft key corresponding to the parameter on the right to set the required value as shown in the following diagram Copyright Itech Electronics Co Ltd 12 A ECH Chapter II Measurement Conditions r RAA ee F F L F USB EXP MOVING 01 AVERAG EXT SEN OTHER INRUSH SET SET SET SET Parameter descriptions Character Function description Set the status of the averaging function When ON is selected the averaging function is enabled When OFF is selected the averaging function is disabled Set the mode of the averaging function EXP index averaging often used for analysis of the non stationary process LINE linear averaging often used for measurement and analysis of the stationary random process The deviation relative to the standard can be reduced by increasing the averaging times Set the linear averaging type MOVING moving averaging REAPEAT repeated averaging Set the times of the averaging function If the mode of the averaging function is set as EXP index averaging the attenuation constant can be set If the mode of the averaging function is set as LINE linear averaging the averaging times can be set 3 Press the Enter key to confirm the setting Averaging mode Index averaging Computing formula k Dn
53. the delay between the appearance of the trigger level and the response of CPU within lus 3 sampling cycles End Copyright Itech Electronics Co Ltd 23 A ECH Chapter V Integral Operation Function Chapter V Integral Operation Function This chapter describes the features and use of the integral function of the IT9121 power meter in details 5 1 Basic Concepts The IT9121 power meter can be used for integral operation of the current and power of the input unit Technical indicators can be calculated In addition the range can be switched automatically in the Buy and Sell modes according to the input level so as to accurately complete integrate measurement During operation of the air conditioner refrigerator induction cook and other household appliances the working status will change frequently resulting in changes of the working current in a large scale The current may decrease of dozens of amperes to a few milliamperes Ordinary power measuring instruments can only be used for integral measurement within one range If the measured value exceeds the current maximum range the measurement result is inaccurate You need to manually switch the range before integral measurement Integral measurement of equipment subject to large current changes cannot be performed continuously The IT9120 series power meter can automatically switch the range in the integral mode Therefore errors of integral measurement caused by manual ra
54. the external current sensor 1 Set the external current sensor 2 ON OFF Set the conversion ratio of the external current sensor 2 EXSENSOR 1 Ratio V A EXSENSOR 2 Ratio mV A OTHER SET Sync Source Other settings Select the synchronization source U I OFF Set the frequency filter ON OFF Set theline filter ON OFF Set the crest factor CF3 CF6 Set the data updating rate Freq Filter Line Filter Crest Factor Update Rate Copyright Itech Electronics Co Ltd 4 hae ECH Chapter I Introduction 0 1s 0 25s 0 5s 1s 2s 5s Measure time s Measuring time 1 5 Introduction of Interface Display Information The IT9121 power meter has four measurement modes Below 1s the introduction of basic interface information with the basic measurement interface as an example Basic measurement interface Select the Meter button and the initial interface of basic measurement as shown below will appear Display area Software status bar of Measuring Pape p keys scrolling time Li datas 1 6 Introduction of Interface Symbols The interface of the IT9121 power meter will display the following symbols Status Bar icon Status description This icon appears when the line filter 1s switched LF on nr This icon appears when the frequency filter 1s F F switched on o gt This icon appears when USB 1s inserted Over voltage protection icon this icon appears when over voltage occurs Copyright
55. to adjust the parameter displayed at present P Q S and Aare set in sequence NOTE When the soft key corresponding to the parameter is pressed once the parameter will be selected in sequence Copyright Itech Electronics Co Ltd 17 br ECH Chapter III Basic Measurement Functions 5 You can also press the INSERT PAGE to add a display page At most five pages are allowable Press the DELETE PAGE to delete the display page At least one page should be left End Copyright Itech Electronics Co Ltd 18 y EGH Chapter IV Waveform Display Function Chapter IV Waveform Display Function This chapter describes the features and use of the waveform display function of the IT9121 power meter in details 4 1 Basic Concepts The IT9121 power meter has a waveform display function based on sampling data The voltage and current waveform of the input unit can be displayed or hidden Only the necessary waveform is displayed to facilitate observation The waveform display interface includes the vertical axis and the horizontal axis Introduction of soft keys on the interface When the ai button is pressed the initial waveform display interface below appears nn LE Upp A AUTO RUN Fu STOP Fi SINGLE KNOB SEL AUTO TIRG MEASURE UATLID UE SET SET Description of information of waveform display interface ipp Parameter name Parameter Ses PURE to this parameter to set the voltage range
56. urce should exceed 50 of the range at least during setting of the range If the crest factor is set as 6 the amplitude level of the PLL source should exceed 100 of the range at least during setting of the range NOTE When the fundamental wave frequency is no more than 200Hz the frequency filter must be turned on When the fundamental wave frequency is lower than 440Hz and contains high frequency components it is recommended to turn on the frequency filter This filter only applies to the frequency measurement circuit If the frequency of the PLL source changes the correct measured value will be displayed after data are updated several times The frequency of the PLL source needs to be tested again via the PLL circuit in the instrument in case of changes of the PLL source or its frequency the correct measured value cannot be obtained at once Harmonic analysis order The harmonic analysis order k is an integer number ranging from 0 to the upper limit of analysis orders Zero indicates the DC component The upper limit of analysis orders is automatically determined by the frequency of the PLL source The upper limit of harmonic analysis orders can be determined automatically or set manually Take the smaller value 50 orders at most The relationship between the upper limit of harmonic analysis orders and the fundamental wave frequency of the PLL source is shown in the table below Fundamental wave Sampling rate Upper limit of frequ
57. y integral value integration will be stopped and the current integral time and integral value will be kept Keep integral value i Keep integral time 7 Start to 4 eos reset integrate ate stoptime Auto Clear used for enabling ON or disabling OFF the function of automatic zero clearing of the integral On integration is restarted when the START key is pressed to start integration OFF integration is restarted based on the integral value at the end of previous integration when the START key is pressed to start integration Auto Cal used for enabling ON or disabling OFF the function of automatic integral calibration When automatic integral calibration is enabled zero setting is implemented In this case the power and current measured just now are subject to integration WP type used for selecting the integral mode for positive and negative watt hours There are four integral modes Charge Discharge used for measuring the DC positive and negative watt hours integration of sampling data Sold Bought used for measuring the AC positive and negative watt hours value integration in each data updating cycle q type used for selecting the current integration mode Options of the current integration mode are as follows rms Effective value mn Calibration to the average rectified value of the effective value dc Simple averaging rmn Average rectified value ac
58. yond a WARNING sign until the indicated conditions are fully understood and met NOTE A NOTE sign denotes important hint It calls attention to tips or supplementary information that 1s essential for users to refer to ii ES ECH IT9121 User s Manual Quality Certification and Assurance We certify that T9121 power meter meets all the published specifications Warranty ITECH warrants that the product will be free from defects in material and workmanship under normal use for a period of one 1 year from the date of delivery except those described in the Limitation of Warranty below For warranty service or repair the product must be returned to a service center designated by ITECH The product returned to ITECH for warranty service must be shipped PREPAID And ITECH will pay for return of the product to customer If the product is returned to ITECH for warranty service from overseas all the freights duties and other taxes shall be on the account of customer Limitation of Warranty This Warranty will be rendered invalid if the product is Damaged resulting from customer wired circuits or customer supplied parts or accessories Modified or repaired by customer without authorization Damaged resulting from customer wired circuits or use in an environment not designated by us The product model or serial number is altered deleted removed or made illegible by customer Damaged as a result of accidents in
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