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Model 928A Operation Manual

1. 1 Press ENT and or 4 to select trigger 2 Use ENT gt and 4 or the number keys to the configure triggering conditions 3 Highlight lt Store And Exit gt and press ENT to store new values 4 Press ESC to exit the configuration screens Trigger Setup Value Definitions Trigger 8 possible profiles available Signal Allowable input signal values INACTIVE means the trigger is not armed CH A MAG CH B MAG WATTS VA VAR PF and FREQ Logic 4 conditionals x lt Limit x gt Limit x gt Limit x ref gt Limit x input signal value Limit Numerical value compared to signal floating point Ref A nominal signal value e g 60 Hz used to com pare to Limit floating point Dwell The persistence in alarm condition before trig ger becomes active in 50 millisecond increments e g 20 1 second an integer 55 A B Function Use the A B function to find the ratio of the two mea sured input signals to Channels A and B If for exam ple you wish to know the ratio of a voltage at channel A to a current a channel B pressing the A B button will display the results of dividing the voltage by the current giving resistance and phase offset of Channel B from Channel A Setup 1 Make sure that Channel A and B are set up prop erly with both channels configured for voltage and or current you must use two channels to use A B If necessary see Configuring Channels A and B on page 23 2 Press A B an
2. 5 Secondary Function Keys 2nd key 5 Navigating Menus to Configure 5 Power Supply On and Off 6 Auto Power Shutdown 6 Battery Power Only 6 AC Power Adapter 8 Bail Assembly 0 8 Measurement Terminals 10 Voltage Terminals 11 Current Terminals 12 vii Basic Functions and Keys MIN MAX Range LCD Display Control Function Keys fl f6 Splash Screen 4 Up and Down Arrows MENU Configuration and Settings Menus in Context ENT Enter or Move ESC Escape Go Back STO Store Value or Reading TIME View or Set Time DATE View or Set Date Using the Input Channels Configuring Channels A and B Using the MN352 Current Probe CT Characterization Files Operation Introduction 3 44 4 64 4 HAR le eS Making Measurements VI Voltage and Current oF Phase and Frequency PWR Active and Reactive Power PF Power Factor amp Apparent Power Wh Watt hour WAV Waveform HRM Numerical Harmonics Graphical Harmonics Flicker Information FLK Instantaneous Flicker Pst Short Term Flicker PQ Power Quality Sags and Swells T
3. 2 Press 2nd gt Pst and read the short term flicker 47 PQ Power Quality Sags and Swells Method The Model 928A measures sags swells and power in terruptions by using the PQ power quality triggering function PQ follows the CBEMA method of mea suring the signals at Channels A and B comparing them to point limits over assigned time intervals The rules used to measure the two input signals including Point Limits are called a Profile An example of the CBEMA method used in the 928A is illustrated below Figure 4 drawn in a manner after the CBEMA method models some sag swell voltage limits and time intervals set in the 928A Time intervals are normally configured as an integer multiple of a half cycle at the nominal frequency Duration in Cycles 0s 4 10 60 t t t t 500 400 Prohibited Region 300 200 100 Earliest measurable cycle Percent of Nominal Voltage rms or peak equivalent No Damage Region 0 001 0 010 0 100 1 000 Duration in Seconds at 60Hz Figure 4 Point Limit Profile 48 The 928A stores power quality PQ records of sags and swells as a list of dates times maximums and minimums while the trigger is active After the trigger becomes Inactive it will display them on the 928A Any one profile may consist of up to 10 Point Limits with each point defined over integer multiples of half cycles of the nominal frequency Configuring point limits is straig
4. To view or record signal waveforms on the 928A select one or both of the measurement channels for voltage and or current You can view up to two voltages two currents or one voltage and one current It does not matter which channel you select A or B to measure voltage or current Setup 1 Make sure that Channel A and B are set up prop erly with at least one channel configured for volt age and or current If necessary refer to Config uring Channels A and B on page 23 Press the appropriate Signal Selection key in or der to measure the signal properly for example press 2nd gt AV to select Channel A to measure voltage Connect the probe s between the 928A and the circuit under test Press WAV and read the Channel A graph on the display 120 29 V a A Channel A Press WAV again to view the channel B graph on the display Press WAV a third time for a combined view of channels A and B on the display 42 Channel B B 1 2512 A 120 75 V Combined 1 2512 A Caution For current probe use see CT Probe Use on page 4 43 HRM Numerical Harmonics To view or record harmonics on the 928A you must select one or both of the measurement channels for voltage and or current You can view up to two volt ages two currents or a voltage and current It does not matter which channel you select A or B to measure voltage or current Setup 1 Make sure to select th
5. USB drivers for Win dows XP are available at the link above Windows Vista is able to locate these drivers online when in stalling Mlink software After you have acquired the drivers you should load them on your system Install FTDI Driver on Windows XP 1 Unzip the downloaded file to a directory 2 Connect the 928A to your computer via the in cluded USB cable Make sure that the 928A is powered on 3 Windows XP should give you a Found New Hardware message small bubble message at task bar It may also open a window that indi cates that it is searching for a driver 4 At the conclusion the Windows new driver in stallation window should allow you to choose a driver Pick from specific location and point to the unzipped directory 5 Click Finish 6 A message should appear Found USB Serial Port small bubble message at task bar 66 7 From specific location point to the same direc tory as above 8 Click Finish and it should be ready to use Linux Version The Mlink Linux version is also available from Ar biter however it will only connect with the 928A if the drivers have been compiled in with the kernel Some Linux distributions may have these drivers available Drivers for Windows Vista To install drivers on a Windows Vista machine make sure that the 928A is connected to your computer via the USB cable and make sure your computer is con nected to the Internet The opera
6. same as highlighting lt STOre And Exit gt and pressing ET Voltage Current key press to view the volt age and or current signals at channels A and B Waveform key press to view the signal wave forms at channels A and B as A and B A or B wn Watt hours key press once to view the cur 94 rent energy values press again to view Q hours Backspace key press to move left in any configuration screen to erase any numerical value or to restart a process e g the Integration graph Also press to enter a negative number during configuration C Up and Down arrow keys press to browse through values in menus browse through function values e g harmonics or for choosing spe cific records held in memory Secondary Keys Channel A current selection press to select channel A for current measurement Channel A voltage selection press to select channel A for voltage measurement Axis key press to set up the axes for the Integration function Channel B A ratio key press to divide channel B by channel A Results are in Ohms Mhos or unit less depending on input choice and degrees Channel B current selection press to select channel B for current measurement Channel B voltage selection press to select channel B for voltage measurement Date key press to view or adjust the date on the Real Time Clock C 4 Multi function keys soft keys fl is a custom u
7. OFFSET 0 0 lt STOre And Exit gt 5 Press t or to select desired field and ENT to select value to change Input Ratio 6 Enter the ratio values from the numeric keypad and press ENT to move to the next field Note that all ratios are referenced to 1 For the ex ample screen above the Input Ratio is actually 1 1 Phase Offset 7 Enter the Phase Offset value from the numeric keypad and press ENT to move to the next field In this example the phase offset is 0 0 8 When finished configuring the channel highlight lt STOre And Exit gt and press ENT to install any new values and return to the Channel Con figuration menu Press ESC to leave the Channel Configuration menu and return to the measure ment mode 24 Current Ch A I Current Configuration includes five items CT Select Input Type Input Ratio Phase Offset and Low Range Mode 1 Open the Ch A CURRENT CONFIG screen Press VI gt 2nd gt MENU move the cursor to Ch A I and press ENT See also Configuring Channel A and B on Page 23 Ch A CURRENT CONFIG CT SELECT USER INPUT TYPE INPUT RATIO PHASE OFFSET 5 LOW RANGE MODE OFF lt STOre And Exit gt 2 Use t or 4 ENT and the numeric keys to enter the CT Select Input Type Input Ratio Phase Offset and Low Range Mode values as required CT Select Selects either USER or MH where o MH HHHH H selects a calibrated CT serial number e g M00001234 e
8. STO button or using one of the Auto Log features The 928A also stores Sags and Swells and standard Triggers in flash memory 400 kB of flash memory provides enough space to store thousands of records Safety and Usage Information Read the usage and safety information inside this man ual Dangerous voltages may be present at the ter minals of the equipment you are measuring so take precautions Safety symbols are used throughout this manual to signify potential hazards to the equipment or to you the user Some of these are as follows Warning identifies an action or a condition that poses a hazard to the user Caution identifies a condition or action that may cause the incorrect operation or damage to the Model 928A Caution Max CT Input Level Never apply any signal directly to the CT inputs of Channel A or B greater than 1 2 Arms or 1 2 Vrms Apply voltage and current signals to two identical channels labeled A and B Prior to measuring make 2 sure that the channels have been correctly configured for the signal type whether they are voltage or cur rent Caution Direct Current Input DO NOT connect a current signal directly to ei ther Channel A or B Always use a current output or voltage output CT when measuring current with the 928A Measuring Safety and Usage Be sure to follow all precautions and safety information provided with any other equipment you are using Display Using a 12
9. USER selects one user calibration con stant M HHE E selects a 12 point characteriza tion set for the specified clamp on CT provided by Arbiter Systems Calibration constants are obtained from Arbiter Systems and installed in the 928A using Mlink software See CT Pro files in the Mlink Software Tutorial on page 72 for information on uploading CT profiles 25 3 Input Type Input Ratio or Phase Offset for M type CT SELECT values are protected from di rect change in the 928A 4 If choosing a CT SELECT value of USER you can change any value in configuration screen 5 When finished configuring highlight lt STOre And Exit gt and press ENT to exit this menu Low Range Mode For current measurements below 10 mA rms i e into the 928A itself not the CT it may be advisable to switch the Low Range Mode ON The Low Range Mode multiplies the input signal by a factor of 20 and can improve accuracy and stability of the signal Input signals above 10 mA rms may cause clipping Voltage Ch B V Change the Channel B voltage configuration in the same manner as for Ch A V as described above Re member that these settings only apply for Channel B when selecting the voltage function Current Ch B I Change the Channel B current configuration in the same manner as for Ch A I as described above Re member that these settings only apply for Channel B when selecting the current function Current Probe Configur
10. You may also connect to the Arbiter home page and choose Service Support then Downloads and finally Model 928A CT Characterization Files 2 Type in the serial number that is located on your probe The site will return a link to select for down loading Select it and download the file to your pc To Upload the CT File Go to CT Profiles on page 72 for instructions on installing and removing the CT file s on your Model 928A Mlink provides you with tools for managing all of the CT files available for your Model 928A Configure CT File in the Model 928A To choose a specific CT profile you will need to go to the Ch A B CURRENT CONFIG menu in the Model 928A See CT Select on page 25 for further details on choosing a specific CT profile 30 Operation Introduction Information in this section provides specific details on configuring and using more advanced functions of the 928A Certain fundamental procedures are covered in the previous chapter such as Configuring Channels A and B starting on page 23 If you have not previ ously reviewed them it would be good to do so at this time Some of the more advanced features covered in this section include measuring Voltage and Current Phase and Frequency Power and Power Factor Harmonics and Flicker Power Quality Triggering AutoLogging and the Log Key Recall of Data Stored in Flash Memory Trending Data Ratio Functions A B and B A Making
11. above cursor identifies 5th harmonic for channel A Pressing the arrow keys after reaching the last harmonic entry on the screen will open the next higher or lower set of harmonics 4 To read Channel B graphical harmonics press 2nd gt lw Repeatedly press 2nd gt luu to toggle between Channel A and B graphical harmonic data 45 Flicker Information In a sense flicker is defined as a fluctuation of the line voltage It is a very specific problem related to human perception and incandescent light bulbs but not a general term for voltage variations The concept behind placing limits on voltage fluc tuations is that they cause lights to flicker which can be irritating and may cause discomfort Voltage fluc tuations are caused by loads on the power distribu tion system which are located near lighting equipment within the same building or powered by the same dis tribution transformer and have changing power or current levels Based on groups of people tested for irritation from light fluctuations most tend to be irritated when the light fluctuates at around 1000 changes minute Ap parently above 1800 changes minute light flicker is no longer perceived Fluctuations in the rms voltage of only 0 25 are sufficient to cause noticeable flicker in light bulbs Some Definitions Voltage Fluctuation a series of voltage changes or a continuous variation of the rms voltage Flicker Impression of unsteadiness of visua
12. battery terminals is to rub them periodically with a cotton tipped swab moistened with denatured alcohol AC Power Adapter Included in the Model 928A Starter Kit is a power adapter Arbiter part no AP0011200 that provides power to the 928A and is suitable for continuous use The power adapter is not designed to charge batter ies located in the battery compartment For power adapter details and specifications see AC Power Adapter on page 91 Caution The AC power adapter does not charge internal batteries Batteries are disconnected when power adapter is connected to the Model 928A Operating with AC Adapter The power adapter supplies power to the 928A for nor mal operation While using the power adapter any batteries installed in the 928A are disconnected To operate the 928A with the accessory power adapter 1 Attach the power supply to a line outlet from 90 to 264 Vac and 47 to 63 Hz 2 Connect the 3 5 mm mini plug into the 928A power receptacle 3 Press ON to operate the 928A Bail Assembly The Model 928A Starter Kit comes with a bail assem bly for propping up the 928A and convenient viewing Note that the plastic inserts on the ends of bail assem bly slide into the pair of mounting holes on the top or bottom of the rear panel See Figures 2 and 3 for details Figure 2 Bail Assembly attached to lower holes Figure 3 Bail Assembly attached to upper holes Measurement Terminals The Model 928
13. connection light If red go back to Startup USB Con nection Click the Download Power Quality Records but ton If you have records to download a SaveAs win dow should appear with supplied filename Click the Save button or type in another filename and click Save A Download records window should indicate the number of records downloaded and say Down load Complete or will say Nothing to Down load if there are no records to download Click OK to finish and close the Download progress window NOTE PQ records take more time to download so do not close the progress window if you do not see 81 immediate progress Uploading New Firmware Mlink provides a convenient method for uploading new firmware to the 928A and optimizing performance When new firmware versions become available obtain them from the Arbiter web site or by contacting Ar biter Systems technical support 1 Start Mlink and select Main gt Upload Firmware The firmware file is in a zipped format and Mlink automatically unzips it 2 Select the file and click OPEN and you should see the progress as shown in Figure 14 The 928A displays FLASH PROGRAM IN PROGRESS during the installation Click OK when finished uploadi E All done a lt Wrote 321 321 Ll OK I Figure 14 Upload Firmware Window 82 Functional Description Introduction The Model 928A is a two channel AC pow
14. drawings and photos that follow Pin Designations names reflect the signal source CT Output Current ot Side CT Output Voltage referenced to Pin 4 CT Output Current No Dot CT Output Voltage Connected to cable shield on current cable Ca0027100 hune Figure 15 928A Current Connector Layout CT Cable Connector XX Figure 16 CT Cable Connector side view Figure 17 CT Connector End View 98 Phase Conventions This appendix contains supplemental material for de termining how the Model 928A responds to the vari ous settings contained in the Phase Freq Preferences menu The 928A allows you to select the reference channel lag polarity range 180 or 0 to 360 lead lag dis play ON or OFF frequency source A or B and fre quency 50 or 60 Hz The items below provide inter pretation for these settings Switching Phase Prefer ence to B effectively reverses the polarity Channel A Signal Channel B Signal gt soe Range Polarity Setting Resultant Setting Reading 180 for Chan B lagging Chan A 60 180 for Chan B lagging Chan A 60 0 360 for Chan B Lagging Chan A 300 0 360 for Chan B lagging Chan A 60 For A Lagging B 180 polarities switch For 0 360 60 and 300 100 CE Mark Certification Declaration of Conformity with European Union Directives Date of Issue
15. in puts are intended for use with external CT having a nominal output of 0 1 Arms or 0 1 Vrms For ba sic measurements voltage current frequency phase angle any combination of inputs may be used For power and energy measurements active power appar ent power reactive power and power factor select one voltage input channel and one current input channel Voltage Input Range 1 to 660 Vrms Impedance 1 2 megohm differential Current Input Range I 0 01 to 1 2 Arms underrange to lt 1 mA Input Range V 0 01 to 1 2 Vrms underrange to lt 1 mV Burden 0 01 Ohm max or 100 kilohms min For underrange turn Low Range mode ON Interface Operator Interface Display 128X64 graphic LCD Keyboard 30 key keyboard Serial USB 1 1 Memory 512 KB Flash Data User Setups Real Time Clock Approx 400 KB measurement data Power Supply Requirements Batteries Type 4 AA Cells alkaline or NiMH Operation 30 hours typical with alkaline cells 60 hours typical with NiMH 88 External Power Supply Part number AP0011200 Type 7 Vdc regulated 5 W Measurements Voltage and Current Method True rms 3 kHz Bandwidth Accuracy 0 1 of reading voltage or 5 mV whichever is greater 0 1 of reading current CT errors 1 of reading CT errors low range Phase Angle A to B Range 0 to 360 or 180 Accuracy 0 1 underrange lt 1 typical Frequency Range 50 or 60 Hz 5 H
16. lt STOre And Exit gt with the cursor and press ENT install the new setting 17 Flash Utilities Menu Use the Flash Utilities Menu to manage 928A mem ory Choose either Stop Full or Overwrite in Full Mode to control storage with full memory condition Choose Yes or No in Erase Flash to do so FLASH UTILITIES MENU Full Mode Stop Full Erase Flash No lt STOre And Exit gt Calibration Date Info If your unit has a calibration certificate highlight this selection and press ENT to view the calibration infor mation Without the certificate the menu item will not appear CALIBRATION INFO CAL Oct 18 2005 DUE Oct 18 2006 Menus in Context To access these menus you will need to be viewing the specific function and press 2nd gt MENU See specific function e g VI or PWR for complete information ENT Enter or Move Press ENT to open a menu selection move between selections within a menu and to confirm a change to a new value 18 ESC Escape Go Back Press ESC to leave a specific menu or go back in keystrokes to the previous screen For example if you are viewing the Main Menu press ESC to leave the Main Menu and view Channel Configuration STO Store Value or Reading Use STO to 1 Write to flash memory the current measured val ues at Channel A and B as shown on the display 2 Save values during configuration of functions e g a CT ratio or phase off
17. 00000 1 4 Ld Let Lal bs 02 X gt Limit Absolute 140 000000 03 X gt Limit Percent 1 100000 04 off Absolute 1 000000 La La Le La Le os off Absolute 1 000000 Cancel OK Figure 13 Power Quality Point Limits Limit sets the numerical value against which the measured signal is compared a floating point value For example absolute Limit 132 volts percent 110 of 120 volts 132 in the Point Limits screen 1 1 x 120 132 Dwell during trigger condition sets the number of input signal half cycles that must occur before recording begins an integer number Click OK to install PQ Profiles in the 928A or Cancel to quit without making any changes User Profile One selection named USER is available with one Point Limit that is only accessible from the 928A keypad See Selecting PQ Profiles on page 50 for information on setting up the USER profile 79 OFF Deactivate PQ Trigger When not recording select OFF for Channels A and B PQ Config to deactivate the PQ Event Recording Otherwise trigger records may fill up the available flash memory module See PQ Event Storage and Viewing on page 53 NOTE The PQ function triggers on the RMS val ues of voltages and currents that exceed the specified Point Limits The RMS value must exceed the Limit for the duration specified as Dwell Download Log Records The 928A is designed to transfer AutoLogg
18. 8x64 pixel display the 928A can display all text and graphics necessary for operation The LCD can be adjusted for contrast and backlighted opera tion The Instrument Case Made from strong copolymer similar to nylon the 928A case is designed to protect it from certain me chanical and electrical hazards however it is not wa terproof Water or other liquids can penetrate the case at a number of points which can permanently damage the unit Therefore use care to protect it from rain spills or condensing environments Caution Water Damage The case is not waterproof Subjecting the 928A to rain or a wet environment will most likely damage it 3 Caution CT Probe Use Please note that the jaws of the CT probe must be fully closed to operate properly Some probes have a locking device which must be fully engaged before the probe will operate correctly When clamping any CT probe around conductors always inspect the two jaws to make sure they are fully closed CT Characterization While the 928A Starter kit includes a CT probe that has been characterized for accuracy Arbiter also pro vides a service for users to have their own CT charac terized for use with the 928A Contact Arbiter Systems for more information on this service For more information on CT characterization files called Profiles see instructions under CT Char acterization Files on page 30 928A Starter Kit AP0011200 7 Vdc Power Su
19. A you must select one of the measurement channels for voltage and the other for current Choose either channel for voltage or current In this example however Channel A is selected as volt age and Channel B as current Setup 1 Check to see if the internal clock is displaying the correct date and time See Time and Date on pages 20 and 21 2 Press 2nd gt AV to configure Channel A for volt age Press 2nd gt BI to configure Channel B for cur rent 3 Connect the test probes between the 928A and the circuit or meter under test 4 Press Wh to display the calculated Watt hours ENERGY VALUES Rec Del 0 000 122 313 0 000 000 000 0 000 305 821 Accum Time 0 04 51 Note Del refers to the power delivered to the load and Rec refers to the power delivered to the source 40 5 Press Wh again to access the second set of energy values Energy Values Value 000 00 000 00 000 00 325 256 Accum Time 0 09 06 Important Note Possible Data Loss You will lose energy data if the 928A shuts down while measur ing energy Since energy values require time to accu mulate consider configuring the Auto Shutdown fea ture so that the 928A does not shut down during a measurement Prior to collecting energy values set the Auto Shutdown feature to OFF and use the exter nal power supply See Auto Shutdown on page 6 Caution For current probe use see CT Probe Use on page 4 41 WAV Waveform
20. A has two identical sets of measurement terminals called Channel A and Channel B that ac cept either a voltage or a current To measure a cur rent select one of the current input connectors at the top of the instrument To measure a voltage select a set of voltage terminals found below the current input connectors CURRENT INPUTS 0 1 2 Arms 0 1 2 Vrms CTOUTPUT ONLY CHANNEL A CHANNEL B OO tO JF AP 660 Vrms 660 Vrms MAX MAX Caution Maximum Input Current Terminals 0 to 1 2 Arms or 0 to 1 2 Vrms See caution for CT probe use On page 4 Versatile Inputs For basic measurements voltage current frequency and phase angle any combination of inputs may be used For power and energy measurements active power apparent power reactive power or power fac tor use a combination of voltage and current inputs LINE LOAD 10 Voltage Terminals Two sets of voltage terminals allow you to apply volt ages up to 660 Vrms max They may also be scaled for reading the primary voltage on a PT or transformer These inputs are labeled CHANNEL A and CHAN NEL B CHANNELA CHANNEL B Or O1O LL AL 660 Vrms 660 Vrms MAX MAX Normally a direct connection e g 1 1 is the de fault selection for measuring voltages however you can configure almost any voltage ratio for PT mea surement at the secondary To configure voltage ra tios other than 1 1 see Configuring Channels A and B starting on page 23
21. AVAIL RECORDS 6592 SAVED RECORDS 0 STATUS INACTIVE In order to operate the Autolog function needs start and stop times and dates and a logging interval in seconds Set up these features while in the AUTOLOG INFO menu by pressing 2nd gt MENU Viewing Autolog Data Use Mlink software see page 80 to download Autolog records to computer and view in spreadsheet format They cannot be viewed on the 928A itself 62 Autolog Setup Always make sure to verify the time a date in the 928A before using the Autolog feature See pages 20 and 21 1 From the Autolog Info screen press 2nd gt MENU The Autolog Setup screen should ap pear AUTOLOG SETUP Start D Feb 09 2005 Start T 08 10 00 p D Feb 09 2005 16 00 00 5 sec lt STOre And Exit gt 2 Use the arrow keys to locate the field you wish to alter and press ENT to open the field value Both screens below show the start date and time Stop date and time screens are very similar Be sure to configure them both SET LOG START DATE MONTH Feb DAY 9 lt STOre And Exit gt SET LOG START TIME HOUR 8 MINUTE 10 SECOND 0 MODE 24 HR lt STOre And Exit gt 3 Adjustment procedure Use the arrow keys to lo cate the desired field value and press ENT to 63 enter the value Use the numeric keypad f or 4 to enter the desired parameters and press ENT to store 4 When you have finished adjusting any parame ters always move the curso
22. Com puter gt Manage gt Device Manager gt Ports COM amp LPT gt USB Serial Port COM X gt Right Click gt Properties gt Port Settings tab gt Advanced button gt COM Port Number gt select an available port up to 9 See Figure 7 Advanced Settings for COM PR COM Port Number COM7 v o K COMS in use A USB Transfer Sizes COME in use Cancel Select lower setin COMS Y hance problems at low baud rates Select higher settings for faster performance Defaults Receive Bytes 4096 Zi Transmit Bytes 4096 SOtC BM Options Miscellaneous Options Select lower settings to correct response problems Serial Enumerator w pam Serial Printer r Latency Timer msec 16 bd E Cancel If Power Off m Toi Event On Surprise Removal Set RTS On Close r Minimum Read Timeout msec 0 x Disable Modem Cul At Startup I Minimum Write Timeout msec 0 Figure 7 Windows XP COM Port Assignment 70 Mlink Main Window Located on the main screen are six basic function but tons as indicated in Figure 8 There are also several important functions found under one menu item called Main On the lower right of the status bar there is a connection light that strobes notifying you of the con nection status When finished close Mlink by clicking the Exit button i MLink Copyright C 2005 Arbiter Syste Load CT Configure Profiles Power Quality Configure Download User Screens
23. Directives Model Number s Manufacturer June 11 2008 89 336 EEC Electromagnetic Compatibility 73 23 EEC Low Voltage Safety 928A Power System Multimeter Arbiter Systems Inc 1324 Vendels Circle Suite 121 Paso Robles CA 93446 USA Harmonized Standard Referenced Signed Signatory EN55011 Class A Radiated and Conducted Emissions EN50082 1 Generic Immunity Part 1 Residential Commercial and Light Industrial environments EN61010 1 Safety requirements of Electrical Equipment for Measurement Control and Laboratory Use 2 Bruce H Roeder This certificate declares that the described equipment conforms to the applicable requirements of the directives on Electro magnetic Compatibility 89 339 EEC Safety 73 23 EEC and amendments by 93 68 EEC adopted by the European Union 102 Index oF 34 2nd key 5 A B key 56 active power 36 ADC 84 apparent power 38 Appendix A 93 B 97 C 99 D 101 auto shutdown 6 17 autologging download records 80 features 62 information 62 setup 63 time mode 64 AXIS key 61 B A key 57 bail assembly 8 battery replacement 7 use amp type 6 calibration info 18 CE Mark Cert 101 copyright v CT example 26 lead set 85 probe MN352 29 selection 25 current low range mode 26 date adjusting 21 viewing 21 DSP 85 ESC key 19 fl f6 keys 14 firmware version 15 flash utilities 18 Flicker defin
24. Log Records Main Download Download Trigger Records Powar Qualy Connection Light green connected red not connected Figure 8 Mlink Main Window Available Functions From the Mlink main window you have the following functions Load CT Profiles Configure User Screens Download Trigger Records Configure Power Quality Download Log Records and Download Power Quality Records Besides these you can select the Main menu to select select a port or upload new firmware 71 CT Profiles Improve the accuracy of the 928A by installing CT profile CT Characterization File for the specific CT probes you use In Mlink software this characteriza tion file is called a Profile The 928A can store up to 5 separate profiles for different probes or different characterizations for the same probe esm cr profes xl Profile 1 z eese Load Profile Figure 9 Load CT M0000040 Profiles Window Profile for Current includes Probe Title Nominal Ratio 100 000000 Nominal Ratio Point Calibration Eor Error Phase 12 Current Points dee wee ee Error Magnitudes cc TAES init ace Error Phases 05 10 013304 0 003901 0 079851 nn taaan nnmaa nnay zd cone To Install Profiles 1 Download CT profile from Arbiter website go to Service Support gt Downloads gt Model 928A CT Characterization Files On CT Character ization page type in entire CT serial number after the M 2 Power on the 928A and
25. MODEL 928A USER S MANUAL Arbiter Systems Inc Paso Robles CA 93446 U S A Notice This manual is issued for reference only at the con venience of Arbiter Systems Reasonable effort was made to verify that all contents were accurate as of the time of publication Check with Arbiter Systems at the address below for any revisions made since the original date of publication Contact Information Arbiter Systems Inc 1324 Vendels Circle Suite 121 Paso Robles CA 93446 805 237 3831 Website www arbiter com mailto techsupport arbiter com mailto sales arbiter com il LIMITED WARRANTY Arbiter Systems makes no warranty expressed or im plied on any product manufactured or sold by Ar biter Systems except for the following limited warranty against defects in materials and workmanship on prod ucts manufactured by Arbiter Systems Products manufactured by Arbiter Systems are guar anteed against defective materials and workmanship under normal use and service for one year from the date of delivery The responsibility of Arbiter Systems under this warranty is limited to repair or replacement at Arbiter Systems option of any product found to be defective Arbiter Systems shall have no liability un der this warranty unless it receives written notice of any claimed defect within the earlier of e Thirty days of discovery by Buyer or e One year from the date of delivery For warranty service or repair products m
26. Measurements VI Voltage and Current Choose either Channel A or Channel B to measure voltage and current If necessary refer to Configuring Input Channels in Getting Started For example if you wish to measure voltage using Channel A then you would press 2nd gt AV CAUTION Do Not Exceed the Maximum Ratings Voltage Inputs 660 Vrms Current Inputs 1 2 Arms or 1 2 Vrms Setup 1 Verify that Channel A and Channel B are con figured properly If necessary refer to Getting Started page 23 Configuring Channels A and B 2 Press VI and connect the probe s between the 928A and the circuit elements 3 Read values on the display 32 Display Definitions 60 000 Hz 123 45 1 2345 8 59 Display Description AV Channel A with units in volts 60 000 Hz measured line frequency 123 45 measured channel A signal in volts 1 2345 measured channel B signal in amps BI Channel B with units in amps 8 59 Phase angle of channel B signal relative in degrees to channel A Caution For current probe use see CT Probe Use on page 4 33 oF Phase and Frequency To measure phase you will need to connect two signals to the Model 928A current current voltage current or voltage voltage Frequency requires only one input Setup 1 Verify that Channel A and B are configured properly for the type of signals that you are mea suring If necessary see page 23 Configurin
27. Press 2nd gt AV to measure voltage at Channel A Press 2nd gt BV to measure voltage at Channel B Note Voltage inputs are isolated by 1 2 Megohms to each other and have a maximum input rating of 660 Vrms Caution Max Voltage Input Level Never apply any signal to Channel A or B voltage input ter minals which is greater than 660 Vrms 11 Current Terminals Two sets of current terminals allow you to measure two currents simultaneously The Current Input terminals for Channels A and B allow you to connect either a voltage output CT or current output CT to the 928A A CT configuration screen allows you to setup CT val ues for both channels ahead of time CURRENT INPUTS o 0 0 1 2 Arms 95 i 0 1 2 Vrms AX CT OUTPUT ONLY CHANNEL A CHANNEL B CT configuration includes entering the CT Output Type either voltage or current CT Ratio and Phase Offset Press 2nd gt Al to measure current at Channel A Press 2nd gt BI to measure current at Channel B Note Use care to select the correct probe type and scale factor to be able to measure accurately Also if using a characterized probe by Arbiter Systems be sure to select the correct characterization file called a Profile See CT Select under Configuring Channels A and B on page 25 Caution No Direct Current Input connect CT probe only See caution for CT probe use on page 4 12 Caution Maximum CT Input Level Never apply any signal to C
28. Profile 0 0 Mlink Installation Screen Mlink Connection Window Windows XP COM Port Assignment Mlink Main Window Load CT Profiles Configure User Screens Window Download Triggers Window Power Quality Settings Power Quality Point Limits Upload Firmware Window 928A Current Connector Layout CT Cable Connector side view CT Connector End View xiii xiv Introduction Scope Welcome to Arbiter Systems Power System Multi meter with Floating Point DSP The Model 928A Power System Multimeter is filled with great features to help you measure electrical power Whether you are a new or experienced user you should find the Model 928A easy to use and accurate Three power sources include alkaline or NiMH AA cells and a 7 Vdc wall adapter for continuous use The alkaline cells provide about 30 hours of use and the NiMH should provide about 60 hours of use Features 128X64 graphic LCD display 30 key multi function keypad Isolated USB serial interface 4 AA cells or a 7 Vdc plug in power supply Flash memory for approximately 6500 records Accurate internal real time clock Mlink application software Simple Measurement To measure simply set the inputs for voltage or cur rent connect the correct set of cables and press the desired function button Recording Data Store data by pressing the
29. RIG Working with Triggers Configuring Triggers viii A B Function 000 B A Function 000 HOLD Hold Metered Value RCL Recall Stored Values Integration Key AXIS Keys 608 eee ee Se as LOG Key so BASS ck we Autolog Setup Mlink Software Tutorial Introduction 2 020004 Download Mlink Installing USB Driver 0 Install FTDI Driver on Windows XP Linux Version Drivers for Windows Vista Drivers for Windows 7 Installing Mlink 2 2 000 000 Connecting to the 928A Startup USB Connection Mlink Main Window Available Functions CE Profiles 0 0 tek yo hg i ae To Install Profiles To Erase Profiles Configure User Screens Download Trigger Records Configure Power Quality 2 0 020 Power Quality Settings Configure Point Limits Point Limit Definitions User Profile s cie a ee eee ee OFF Deactivate PQ Trigger Download Log Records Download Power Quality Records ix Uploading New Firmware 82 Functional Description 83 Introduction sis amp 4 sce ave Gost Hew ae 83 User Interface 2 ee 83 Detailsto 02 i feck amp aa A teo ae hk dad Ae 84 Input Sections 84 M
30. TO Power Supply On and Off Press ON to power the 928A ON and OFF To con serve power the multimeter can be configured to au tomatically turn itself off after an adjustable period of inactivity For help on supplying inlet power whether con necting the power source or installing batteries see page 7ff Auto Power Shutdown The 928A auto shutdown feature allows you to select whether you want the 928A to automatically shutdown or not To automatically shut down and conserve bat teries use the the Auto Shutdown menu under the Main Menu A number of different time intervals are available in which the 928A will automatically power down See Auto Shutdown on page 17 Battery Power Only The Model 928A operates on four AA alkaline or Nickel Metal Hydride batteries In the event of a bat tery failure always carry a spare set of fully charged batteries Battery Replacement 1 Power off the 928A prior to removing the batter ies 2 Remove the battery cover retaining screw and remove the cover by pulling it upwards at the screw side See Figure 1 3 Replace the batteries Note that battery orien tation is indicated by polarity symbols 4 Replace the battery cover and retaining screw and put back into service Figure 1 Battery Compartment Caution To optimize reliability and reduce the possibility of corrosion between the contacts keep all terminals as clean as possible One method of clean ing the Model 928A
31. UX and ADC 84 DSP isiyi teh KD ad deer d n ahs 85 Power Supplies 85 Accessories 2 ee 85 Current Measurement 85 Voltage Measurement 86 Soft Carrying Case 0 86 USB Data Cable 86 Specifications 87 Input e s moa e m ee Re ee wes 87 Input Configuration 87 Voltage 2 4 3742 2 4 tik ae aha eed es 88 Current wiss 2 4 a Re eee ae ye 88 Interface dets a t Bab dA Ae es oe 88 Operator Interface 88 Power Supply Requirements 88 Batteries 0 008 88 External Power Supply 89 Measurements 0004 89 Voltage and Current 89 Phase Angle AtoB 89 Pr quen y o oe ar os a boe ae we ales 89 Harmonics 6 04 a a ee a a 89 Waveform aaoo a 90 Power and Energy Quantities 90 General 005 AA ee HL EA 2 90 Physical s iit 4 4 4 4 6 Oe ace ae ds 90 Environmental 90 AC Power Adapter MN352 Current Probe Probe Specifications Keypad Definitions Primary Keys ei onos enasi nsa wa Secondary Keys oaa CT Input Connector 928A Current Input Connector CT Cable Connector Phase Conventions CE Mark Certification xi 99 101 xii List of Figures Battery Compartment Bail Assembly attached to lower holes Bail Assembly attached to upper holes Point Limit
32. User Screens button 4 To add new fields select the desired fields in the Possible Fields box and click the right arrows Configure User Screens a xj Screen 1 Screen 2 Possible Fields Selected Fields Power Factor Cancel OK Figure 10 Configure User Screens Window NOTE Each user screen allows a maximum of seven items the maximum number of lines on the 928A display 5 To remove fields select the desired fields in the Selected Fields box and click the left arrow 6 To change the order in the Selected Fields win dow select the desired field in the Selected Fields box and click either the Up or Down arrow to change the order 7 Click OK to close the Configure window 74 Download Trigger Records The 928A allows you to quickly move event triggered records to your pc using Mlink Triggers must first be defined and activated in the 928A see TRIG Working with Triggers on page 54 Ci x Downloading 144 records WARNING l Figure 11 Download End message received Triggers Window E Power on the 928A and connect the USB cable between the 928A and the computer Start Mlink and check for a green connection light If red go back to Startup USB Con nection Click the Download Trigger Records button If the 928A has Trigger Records to download a Save Log As window should appear with supplied filename for the data Click the Save bu
33. ation Examples For secondary side measurements you will need to set up the instrument scale factors so that you can cor 26 rectly read the primary value The example below shows how to configure a specific probe EXAMPLE Current Probe Specification AC Current Probe AC Input 75 Arms maximum AC Output 10 mV A rms 660 Vrms Working volts maz This probe produces 10 mV at the output terminals to the 928A for an input current of 1 Amp MAXIMUM OUTPUT VOLTAGE AC Input x AC Output Ratio 75 A x 10mV A 750 mV or 0 75 Vrms It is safe to apply a current or voltage to either current input if it is less than or equal to the specified maximum of 1 2 Vrms or 1 2 Arms In this case it is safe to apply 0 75 Vrms being less than 1 2 Vrms If using a current output CT you would be able to apply up to 1 2 Arms to either current input Selecting a Channel Function Press 2nd gt AV to select voltage at Channel A Press 2nd gt Al to select current at Channel A Press 2nd gt BV to select voltage at Channel B Press 2nd gt BI to select current at Channel B 27 CT Probe Selection ATTENTION A CT profile or characterization file may be selected on only one channel at a time For ex ample if the current probe profile is selected on chan nel B you will need to deselect it from channel B before selecting it on channel A If not deselected on Channel B it will not be available for selection on channel A See al
34. bove the nomenclature printed on the key itself Phase Frequency key press to view the phase and frequency at channels A and B Phase re quires two signals and frequency only one signal fre quency channel is selectable Channel A B ratio key press to divide channel A by channel B Results are in Ohms Mhos or unit less depending on input choice and degrees Enter key press to open a hidden menu or install a configuration value Escape key press to return to a previous screen or to leave a specific menu FLK Instantaneous Flicker press to view the instantaneous flicker updated once per second Hold key press to hold the reading of the signals at channels A and B press again to return to the measurement mode Works with any of the specific measurement functions Numerical Harmonics key press to view the harmonics of the signals at channels A and B from the 2nd to the 50th in tabular form ON key press to switch the 928A on and off Power Factor amp Apparent Power key press to display the Power Factor and Apparent Power in Volt Amps Power Quality key press to review power quality data records sags and swells interruptions Download records using Mlink Active amp Reactive Power key press to display the power in Watts and Vars STO Store key press to 1 to write current measurements to the flash memory card or 2 to as sign values during configuration
35. cessary even though it is a USB port since the 928A uses an RS 232 to USB Bridge technology to create a virtual COM port Otherwise you should only see the Mlink main window next page with a green connection light Normally after you have first seen the connection window in Figure 6 you will not see this window again Select a serial port Port s Permissions OK Status COM3 True No PSM detected COM True k PSM 00001024 Connected lt Refresh Cancel Figure 6 Mlink Connection Window Connecting 1 To connect select the desired COM port number and click the OK button A short delay may occur for the OK button to become available 2 If the port number does not appear click the Refresh button another port should appear e g COM3 It may take a few seconds to appear Then repeat step 1 3 Under the Status column it should indicate if the 928A PSM is detected or not The unit se rial number should appear e g PSM 00001109 Connected NOTE If you do not see the correct COM port in the connection window you may need to do the following 4 Close Mlink and power cycle the 928A 69 5 Restart Mlink and check for your COM port as per steps 1 3 above 6 If the previous step does not work then you may want to check which COM port Windows is us ing Sometimes it will not work properly if it assigns a port of COM 10 or higher 7 To check this you will need to go to My
36. connect the USB cable between the 928A and the computer 3 Start Mlink and check for a green connection light If red go back to Startup USB Con nection 4 From the main screen click the Load CT Pro files button 72 5 Select the Profile number that you wish to in stall e g Profile 1 this includes any of the five filenames 6 Click the Load Profiles button to browse for the CT profile file for uploading Select the file and click OPEN Profile data should immediately ap pear in the Load CT Profiles window 7 Click OK to close the Upload CT Profile window To Erase Profiles 1 Select one profile number you wish to erase e g Profile 1 Profile 5 and click the Erase but ton The profile data will be erased and replaced with zeros 2 Click OK close the CT Profile window NOTE To apply profiles in the 928A see Current Ch AI on page 25 Configure User Screens Two user screens are available for you to customize the 928A display See page 14 Once configured you can toggle between the two screens by pressing 2nd gt f1 successively If your requirements change you can run Mlink again to change the order or type of functions listed in the 928A User Screens 1 Power on the 928A and connect the USB cable between the 928A and the computer 2 Start Mlink and check for a green connection light If red go back to Startup USB Con nection 73 3 Click the Configure
37. cords directly from flash on the 928A by press ing PQ Changing the PQ profile will not disturb records already stored in flash memory NOTE Make sure to download event records us ing Mlink software prior to deleting from flash in the 928A Selecting PQ Profiles Except for one PQ profile named USER all PQ Pro files are configured by using Mlink software Configure the profile named USER only from the 928A keyboard 50 Additionally Channels A and Channel B may be con figured independently POWER QUALITY CONFIG Ch A PQ CONFIG Ch A Ch B ale PQ PROFILE PROF Arbiter Test 1 VIEW POINTS lt STOre And Exit gt To select a PQ Profile press PQ gt 2nd gt MENU With the cursor highlight either Chan nel A or B and press ENT to open the profile selection screen seen in right screenshot There will be 7 available choices 5 PQ Profiles 1 USER Profile and OFF to disable Press ENT to highlight the profile name e g PROF 1 and f or to select the desired PQ profile name Press ENT to assign the profile name and to move to VIEW POINTS Press ENT with cursor on VIEW POINTS to open the Point Limit viewing screen or highlight lt STOre And Exit gt and press ENT Press ESC to exit USER Profile Setup Select one USER profile in the same manner as for Profile 1 5 and OFF From PQ Profile select USER and press ENT Select VIEW POINTS and press ENT You should see the screen depicted
38. creen 2 Use f or to select the record for viewing 3 Press ENT to view the selected record data Note the word REC1 for Record 1 in the lower right of the display below Apparent Power VA 129 06 0 8765 Power Factor REC1 4 Press ESC to return to the Recall Data screen and select a new record Press ESC again to leave the Recall Stored Values list 59 Integration Key Purpose Use the Integration function to view a plot of the se lected signal over time Signals include voltage cur rent frequency phase and power factor Configure the signal sampling interval from 1 to 65535 seconds The vertical range scales according to the upper and lower limits that you configure Press 2nd gt AXIS to scale the plotted values to the desired viewing range This includes the upper and lower limits the last measured value a vertical graticule and the units of the measured signal See next page for setup details Procedure 1 Press 2nd gt to plot and view the configured signal 2 Press and hold for three seconds to restart the plot Example In the example below the plotted signal i e Source is frequency the upper and lower limits Axis Max and Axis Min are 60 020 and 59 980 Hz and the last measured value is 60 00 Hz Since the Graph Type chosen is Scroll previously plotted data moves left 60 AXIS Key Use the AXIS key to configure how the Integration function plots the signal s
39. ctory message that describes the 928A Press any of the main measurement keys e g VI to bypass the splash screen A ARBITER eae SYSTEMS 928A Power System Multimeter Up and Down Arrows Press t or to step through values in configuration menus or for choosing specific records held in memory 14 MENU Configuration and Settings Use the MENU key to set up the functions preferences and operating parameters of the 928A Access these menus through the Main Menu or in context Main Menu 1 Press 2nd gt MENU gt 2nd gt MENU to open the main menu 2 Press ESC to backup to previous menus MAIN MENU Version Information Phase Preference Frequency Preference Auto Shutdown Data Flash Utilities Calibration Date Info Firmware Version 1 Open the main menu as shown above under Main Menu 2 With the cursor highlight Version Information and press ENT and read the version information VERSION SerNum 00000140 xx Main Processor 1 00 Aug 30 2005 xkk DSP Processor 1 00 Aug 29 2005 3 Press ESC to backup to previous menus 15 Phase Preference 1 From the Main Menu highlight Phase Prefer ence with the cursor and press ENT to open the Phase Preference menu PHASE PREF SELECTION REFERENCE A POLARITY B LAGS A RANGE 180 LEAD LAG DISPLAY lt STOre And Exit gt REFERENCE Press ENT and f or to set the Reference to Channel A o
40. d connect the measurement probes to the circuit under test 3 Read the display Ch A ChB A B 10 000 Ohms Ph 9 0000 A 120 0V B 12 001 NOTES If you configure channel A as current and channel B as voltage then the units will be in Mhos and degrees If you choose two voltages or two currents then the units will be a strict ratio with no displayed units for A B and degrees 56 B A Function Use the B A function in the same manner as you would with the A B only with the reverse response as with the A B function and the same input signals Use the B A function to find the ratio of the two measured input signals to Channels A and B If for example you wish to know the ratio of a voltage at channel A to a current a channel B pressing the B A button will display the results of dividing the current by the voltage giving conductance in Mhos and phase offset of Channel A from Channel B in degrees Setup 1 Press B A and connect the measurement probes to the circuit under test 2 Read the display ChB ChA B A 0 1000 Mhos Ph 9 0000 A 120 0V B 12 001 NOTES If you configure channel A as current and channel B as voltage the units will be in ohms and degrees If you choose two voltages or two currents then the units will be a strict ratio with no displayed units for B A and degrees 57 HOLD Hold Metered Value Press HOLD to leave the measurement mode and re tain the last
41. e correct signals for Chan nels A and B for example press 2nd gt AV to measure voltage on channel A Press HRM and connect the meter probes be tween the 928A and the circuit under test Read the display this example indicates channel A voltage magnitudes fundamental through the 7th harmonic and phase angle in degrees A 1 2 3 4 5 6 T ecocoou Press f or to view the full range of tabulated harmonic values from the fundamental to the 50th harmonic Press the arrow keys to move through the individual harmonic numbers and levels in groups of seven To read Channel B numerical harmonics press HRM Repeated pressing HRM toggles between Channel A and B numerical harmonic data 44 Graphical Harmonics To view a graphical representation of harmonics on the 928A you must select one or both of the measurement channels for voltage and or current The Model 928A allows you to view both voltages and currents however it will allow you to view only one channel at a time Each channel must be viewed separately due to the allowable space on the display Setup 1 Press the appropriate Signal Selection key in or der to measure the signal properly for example press 2nd gt Al 2 Press 2nd gt lw and connect the meter probes between the 928A and the circuit under test Read the display aus 0 152A 35 2 3 Press t or 4 to move the cursor to select the desired harmonic e g in display
42. ed records using the LOG key to your pc To configure Au tologging see LOG Key on pages 62ff To transfer records from the 928A to the pc you will need to have some records already stored in the 928A flash memory module Logging is based on start and stop times and dates In order to use this feature effectively make sure to set the correct time and date See TIME and DATE on pages 20 and 21 1 Power on the 928A and connect the USB cable between the 928A and the computer 2 Start Mlink and check for a green connection light If red go back to Startup USB Con nection 3 Click the Download Log Records button 4 If you have records to download a Save Log As window should appear with supplied filename Click the Save button or type in another file name and click Save 80 5 A Download records window should indicate the number of records downloaded and say Down load Complete or will say Nothing to Down load if there are no records to download Click OK to finish and close the Download progress window Download Power Quality Records Use this feature to transfer power quality records from your 928A to your pc Downloading is very much the same as for Standard Log Records or for Trigger Records and requires that records be stored in the 928A flash memory module 1 Power on the 928A and connect the USB cable between the 928A and the computer Start Mlink and check for a green
43. er mea surement instrument providing 0 1 accuracy in a handheld package Besides voltage current and power quantities it measures power quality including har monics flicker sags surges and interruptions Also it includes a graphical display internal clock approxi mately 400 KB of flash for data storage and full time battery operation using common AA size NiMH or Al kaline cells User Interface The user interface consists of a 128 x 64 graphic LCD with backlight and 30 key silicone keypad Also in cluded is a USB serial interface for configuring and data retrieval Details Input Sections Two identical input channels A and B allow users to connect to voltage sources 0 to 660 Vrms and to current sources 0 to 1 2 Arms or 0 to 1 2 Vrms de signed to work with a CT up to approximately 1000 A To allow accurate measurements at low current lev els lt 10 A there will be a x100 booster amplifier available to extend the input current range downwards to about 10 100 mA with a 1000 1 external CT for full accuracy and lower with somewhat reduced per formance Current Inputs are connected to the upper connectors and allow for a voltage output or current output CT The current input section has a 1000 1 CT giving an output current of 0 to 1 mA which is then converted to a voltage The voltage input section uses medium power low TC resistors that accept up to 660 Vrms with a 1 Vrms signal to the ADC The c
44. g Channels A and B 2 Press F and connect the probes to the circuit elements 3 Read the values on the display Phase Deg 9 45 60 005 Frequency Phase Preferences In this example Channel B signal current is lagging Channel A voltage and is configured to report the phase as negative 9 45 If you want Channel B lag ging Channel A to be reported as positive you would need to open the Phase Preferences screen under the Main Menu and select as follows Polarity B lags A Make sure the cursor covers the sign and press one of the arrow keys to toggle it to the desired value and press ENT For complete details on Main Menu Configuration see page 16 under Phase Preference 34 Note that the 928A is very flexible and always com pares the signals at channels A and B for their phase relationship regardless of the type of signal whether voltage or current Phase Conventions The following chart illustrates the standard phase con ventions as used in the Model 928A In this example the inputs measured by the 928A may be either voltage or current signals SA SB Phase Example A SA Signal at Channel A gt 60 e SB Signal at Channel B Phase Angle Signal A to B 60 SB is delayed from SA by 60 degrees or approxi mately 2 8 milliseconds in time at 60 Hz The phase is therefore referred to as lagging and given a negative sign If you prefer to see a lagging signal gi
45. hannel A or B current input terminals which is greater than 1 2 Arms or 1 2 Vrms Basic Functions and Keys MIN MAX Range Press the MIN MAX key to cycle through various measurements including the minimum maximum av erage and normal active To reset MIN MAX values to zero press and hold the backspace key for 3 seconds while in MIN MAX function LCD Display Control LCD CONFIGURATION CONTRAST BACKLIGHT OFF 1 Press 2nd gt LCD to open the LCD configuration screen 2 Press t or to select LCD contrast or Backlight control 3 Press ENT to select contrast slider bar or back light condition 4 Press or to adjust contrast or select backlight ON or OFF and press ENT 5 Highlight lt STOre And Exit gt with the cursor and press ENT to install new values and exit 13 Function Keys f1 f6 fl Custom User Screen Press 2nd gt f1 to access either of two custom user screens These screens are in tabular format and allow up to seven functional entries Configure all user mea surement functions through Mlink software for more information see Mlink Software Tutorial starting on page 65 CUSTOM 1 CHAN A 120 0 V CHAN B 5 123 I THD A 7 125 FREQ 59 995 PHASE 19 09 VAR 201 06 PF 0 945 f2 f6 There are currently no functions assigned to the secondary keys labeled f2 through f6 Splash Screen When first powered on the 928A will display an intro du
46. htforward existing ones may be adjusted and more added at a later time Note the PQ function measures RMS values only In the diagram below notice that half cycle volt age waveform elements have been squared with each half cycle having a different maximum compared to nominal Also notice that these half cycle elements are grouped in overlapping pairs It is the rms value of two adjacent half cycle elements that are compared to the profile limits Fist Reading lt lt Second Reading j 3 a 3 Under Nominal Over Nominal Percent Square of Nominal Voltage 0 0 5 1 0 15 Cycles of Nominal Frequency Voltage Waveform 49 PQ Profiles The Model 928A can store up to 5 distinct PQ profiles that may be configured using Mlink software and up loaded into the 928A Profiles are listed in the Model 928A as OFF USER PROF 1 PROF 5 USER Profile One profile called USER is available only from the 928A keypad When you select USER you can set up one point limit directly in the 928A Records stored from USER profile are only available on the 928A itself and cannot be downloaded Profiles OFF Select OFF when not using PQ Triggering Otherwise PQ triggering could fill up the available memory See Selecting PQ Profiles on following pages Working with PQ Profiles and Records Internal flash memory will store all PQ event records until flash memory is full overwritten or erased View event re
47. itions 46 instantaneous 47 Plt 47 Pst 46 103 FLK key 47 frequency preference 17 FTDI driver 66 function keys primary 5 secondary 5 functional description 83 CT lead set 85 DSP 85 input sections 84 MUX amp ADC 84 power supplies 85 soft carrying case 86 standard CT 86 USB cable 86 user interface 83 voltage meas 86 harmonics graphical 45 HOLD key 58 HRM key 44 input channels configuring 23 measure current 25 measure voltage 23 phase offset 24 set voltage ratio 24 using 22 input sections 84 integration key 60 issuance ii key definitions oF 93 A B 93 Al 95 AV 95 AXIS 95 B A 95 backspace 95 BI 95 BV 95 DATE 95 ENT 93 ESC 94 fl ldots f6 95 FLK 94 graphical harmonics 96 HOLD 94 HRM 94 integration 96 LCD 96 LOG 96 MENU 96 MIN MAX 96 numeric 93 PF 94 PQ 94 Pst 96 PWR 94 RCL 96 STO 94 TIME 96 up arrow 95 VI 94 WAV 94 Wh 95 Linux version 67 104 LOG key 62 low range mode 26 88 max input rating 32 MENU key 15 MIN MAX key 13 Mlink config fl key 73 configure PQ 76 connecting 68 download Log records 80 Mlink 66 PQ records 81 trigger records 75 erasing profiles 73 install USB driver 66 installing 68 main window 71 upload CT profiles 72 new firmware 82 with Vista 67 MUX 84 ON key 6 ON OFF 6 PF key 38 phase conventions 35 lead lag displa
48. l sensa tion induced by a light stimulus whose luminance or spectral distribution fluctuates with time Short Term Flicker Indicator Pst The flicker severity evaluated over a short period 10 minutes Pst 1 0 is the conventional threshold of irritability A reasonable goal might be to limit Pst values to less than 1 0 for 95 of the time 46 Long Term Flicker Indicator Plt The flicker severity evaluated over a long period over 2 hours using successive Pst values The Plt threshold is 0 8 Plt is not measured by the 928A FLK Instantaneous Flicker FLK flicker is defined as the instantaneous flicker that is updated each second By simply pressing FLK the 928A will display instantaneous flicker based on the signals applied to channel A and or B To view flicker on the 928A you must select voltage for measurement channels A and or B 1 Press 2nd gt AV and or 2nd gt BV 2 Press FLK and read the instantaneous flicker FLK flicker values are measured at approximately 100 millisecond intervals and updated on the 928A dis play each second Pst Short Term Flicker Pst flicker is defined as Short Term Flicker and aver ages the flicker values over a ten minute time period counting down in seconds The display shows a count down value as Pst is being processed At the end of the countdown period Pst is displayed based on the signals applied to channels A and or B 1 Press 2nd gt AV and or 2nd gt BV
49. lace them in any order This makes setting them up very flexible In the example below Figure 13 there are three separate point limits defined All of the limit func tions are X gt Limit two limit formats are absolute and one is percent The limits are defined in decreasing voltages as 150 140 and 120 with the first two fixed limits and one as a sliding reference Each point is assigned a different dwell time 1 4 and 12 half cycles respectively Use a sliding reference for example to provide a gradually changing limit to account for a line voltage that changes slowly throughout the day The slid ing reference uses the method described in IEC 61000 4 30 paragraph 5 4 4 and should eliminate needless triggers during normal operation Hard limits could be used for extreme voltage swings Point Limit Definitions Point denotes the number of the Point Limit 1 10 You can define up to 10 different points to measure the selected value e g voltage or current Limit Function set to OFF X lt Limit X gt Limit Limit Format set to Absolute or Percent Absolute refers to the the actual measured value e g X voltage gt 130 Vrms Percent refers to a percent of the measured value e g 105 percent of the measured value entered as 1 05 78 Configure Power Quality Profile 1 Settings Point Limits Point Limit Function Limit Format Limit Dwell half cycles 4 OL X gt Limit Absolute l4 150 0
50. ll through the listed events by pressing f or shows MIN MAX values when PQ Trigger is Inactive right screen no MIN MAX values when Active left screen 3 Press any other function key to leave the PQ Event List 4 Use Mlink software to download PQ records in CSV format to view in spreadsheet form PQ TRIGGER ACTIVE PQ TRIGGER INACTIVE CH A PROF 1 PHT 1 CH A PROF 1 PHT DATE Sep 20 2005 DATE Sep 20 2005 TIME 10 00 12 893066 TIME 10 00 17 084277 2 MIN e MAX eeee REC 1 oF 4 REC 2 of 4 AVAIL RECS 24526 AVAIL RECS 24526 NOTE PQ profiles PROF 1 PROF 5 must be configured through Mlink software then uploaded to the Model 928A PQ Records When the signals measured at either Channel A or B exceed any Point Limit the Model 928A will record the following values e Start amp Stop Times e MAX amp MIN values within Start and Stop Times Press PQ to view recorded events by time and date To view PQ data from Excel or other spreadsheet use Mlink software to download records from 928A 53 TRIG Working with Triggers Use TRIG to test various input signal conditions such as voltage interruptions or frequency changes When these conditions match the defined triggering limits the 928A will record the start and stop times and the maximum or minimum signal value during the event i e the date and time in which the trigger is active TRIG is very similar to PQ triggering as desc
51. mber AP0012300 voltage output For up to 120 Arms use the MN352 100 1 socket output cur rent probe with the Model 928A Power System Mul timeter Using the latest transformer technology the MN352 can measure currents from 0 1 to 120 Arms over a frequency range of 40 to 10 kHz Probe Specifications Electrical Nominal Range 0 1 to 150 Arms Measurement Range 0 1 to 120 Arms Output Sensitivity 10 mV A Accuracy 2 uncompensated Phase Shift 1 20 Arms 3 0 Frequency Range 40 to 10kHz Limiting Oper Cond 200A perm to 1 kHz Crest Factor 3 150 A peak Working Voltage 600 Vrms General Maximum Conductor Size 20mm Output Connection 4mm safety sockets Operating Temp Range 10 to 55 C Storage Temp Range 40 to 70 C Operating Humidity 85 10 35 C Weight 180g 6 5 oz 1 2 Vrms is the input limit on the 928A current in put BEFORE USING PROBE Please read section entitled Caution CT Probe Use on page 4 92 Keypad Definitions This appendix lists all of the keys on the Model 928A keypad for both the primary and secondary purposes For Primary keys press only the key itself For sec ondary keys press and then the key with blue label above the key button of choice Primary Keys Numeric keys including decimal y 8 point press to enter any necessary value during con figuration menus Secondary key press to access any of the blue secondary keys located a
52. measured value on the display Press HOLD again to return to the measurement mode The Hold function operates only with measurement functions and not with setup screens or with Date and Time To view and or change the Date and Time see DATE or TIME on pages 20 and 21 When in the hold mode you will see the word HOLD in the lower secondary line of the display as illustrated below When not in the measurement mode the word HOLD will disappear AV 60 000 Hz 123 45 Secondary Lines 1 z 2 3 4 5 B I HOLD 38 59 Procedure 1 Set up the 928A to measure the values you wish to observe If necessary see Configuring Chan nels A and B on page 23 2 Connect the measurement probes between the 928A and the circuit under test Press HOLD This puts the display in the hold mode 3 Read the values 4 Press HOLD again to return to the measurement mode 58 RCL Recall Stored Values Press 2nd gt RCL to open the list of records stored from pressing STO Records are replaced when storing a new record over the old record location The Model 928A can store up to eight records using STO and numbered from 1 to 8 Records are stored according to number type date and time as shown in the example below Viewing Procedure Selected gt 0 0 0 0 0 0 0 0 WWWWNHNRE A a a a a OOD ONKFPNE Onhe BANU amp NWUOrRCOF Oxnor our OH 1 Press 2nd gt RCL to view the Recall Stored Data s
53. oltage Caution For current probe use see CT Probe Use on page 4 37 PF Power Factor amp Apparent Power To use the Power Factor and Apparent Power func tion on the 928A you will need to select one of the measurement channels for voltage and the other for current In this example Channel A is selected as voltage and Channel B as current Setup 1 Press 2nd gt AV to configure Channel A for volt age and press 2nd gt BI to configure Channel B for current LINE LOAD Note in this figure voltage probes are con nected to Channel A and CT connected to Chan nel B 2 Press PF and connect the probes between the 928A and the circuit elements 3 Read the display 38 Display Definitions Apparent Power VA 129 06 0 8765 Power Factor The power factor displayed is determined from the reactive component of power Lead Lag Display If you wish to know if the power factor is leading or lagging configure this through the main menu under Phase Preference See page 16 under Phase Prefer ence The screen below shows a lagging power factor with the Lead Lag indication turned ON Apparent Power VA 129 06 0 876 Power Factor LAG Caution For current probe use see CT Probe Use on page 4 39 Wh Watt hour Use this mode to view the energy received and deliv ered To view or record any of the 10 energy values mea sured in the Model 928
54. on the right be low 51 Ch A PQ CONFIG PQ USER PROFILE CH A Signal v PQ PROFILE USER Logic X gt LIMIT Arbiter Test 1 Limit 120 00 HYS 2 00 VIEW POINTS Dwell 100 lt STOre And Exit gt lt STOre And Exit gt USER Profile Definitions Signal Select either V for voltage or I for current Logic Compares Signal X to Limit select either X gt LIMIT or X lt LIMIT Limit Logically compares the signal to this value select any floating point number up to 1 000 000 HYS Hysteresis adds to the Limit value to reduce unnecessary events select any floating point number up to 1 000 000 Dwell Number of half cycles while while Logic is true before trigger becomes Active select any integer number up to 65535 Tips on PQ Triggering Here are some situations where you might not see any recorded events even though the measured parameter meets the required Limit conditions 1 The parameter already meets the limiting con dition when setting the trigger it needs a tran sition from LO to HI or HI to LO before trigger becomes Active 2 The parameter did not meet the dwell condition 3 The parameter met the original limit conditions however fell outside the sliding reference time constant see IEC61000 4 30 par 5 4 4 52 Accessing PQ Events 1 Press PQ to view power quality event records Power Quality events are listed according to Record Number RECS Date and Time 2 Scro
55. ource There are five cate gories to set up in this menu INTEGRATION GRAPH SOURCE Freq INTERVAL 1 sec GRAPH TYPE Scroll AXIS MAX 60 020 AXIS MIN 59 980 lt STOre And Exit gt Graph Definitions Source Interval Graph Type Axis Max Axis Min Procedure Chan A Chan B freq phase PF Actpwr From 1 to 65535 in seconds Scroll or Fixed Maximum plotted value on display Minimum plotted value on display 1 Press 2nd gt AXIS to open the Integration Key configuration screen 2 Press t or to locate the desired field and ENT to enter the variable field 3 Press t or number keypad to change the re quired values s and press ENT to store value 4 Finally highlight lt STOre And Exit gt with the cursor and press ENT to save any changes and exit this menu 5 Press ESC at any time to quit the menu function 61 LOG Key Purpose Use the LOG key to automatically record basic electri cal data to the 928A flash memory over a specified time interval This function also called AUTOLOG makes it convenient to record measured electrical quantities while the equipment is unattended Logging Features e Basic Data only see list at end of section e Logging interval in seconds e Stores up to 6592 records maximum Viewing Autolog Information To view Autolog information press 2nd gt LOG and the screen will display some basic information about the data logging features AUTOLOG INFO
56. pply AP0009700 Single Phase Voltage Lead Set AP0012300 100 1 Clamp On CT 150 A 10 mV A BT0000201 1 5 Volt AA Alkaline Battery 4 CA0026106 928A USB Cable A B 6 ft CA0027200 928A CT Cable Voltage Output PD0030900 Operation Manual HD0069800 928A Soft Carrying Case CTCALO1 CT Calibration 100 mA 100 A AS0082900 928A Bail Assembly Getting Started Keyboard Operation Most of the keys on your 928A perform one primary and one secondary function The primary function of any key is indicated by the characters on the face of the key for example ON The secondary functions are indicated above the key for example RCL above the HOLD key See page 93 for key definitions Primary Function Keys Primary keys need only to be pressed to function For example press to set the multimeter mode to read voltage and or current for Channel A and B Secondary Function Keys 2nd key First press followed by any key with symbol marked in blue above it Navigating Menus to Configure 1 To select a configure mode press any function key then 2nd gt MENU For example PQ gt 2nd gt MENU or 2nd gt LOG gt 2nd gt MENU 2 Scroll through fields using the t or key and press ENT to move the cursor to the value field 3 Press t or number keys to change these values press ENT to install and move to another value 4 To save changes and exit highlight lt STOre And Exit gt and press ENT Alternatively press S
57. r B Press ENT to set it POLARITY Press ENT and f or to set POLARITY as positive or negative and ENT to set it Note Notation changes from B LAGS A to A LAGS B when switching REFERENCE from A to B RANGE Press ENT and or to select the range value to either 180 or 0 360 and ENT to set it LEAD LAG Display Press ENT and or to switch the Lead Lag display ON or OFF When selecting ON the words LEAD or LAG will be displayed in the PF Apparent Power Power Factor function Highlight lt STOre And Exit gt and press ENT to install values 16 Frequency Preference 1 From the Main Menu highlight Frequency Preference and press ENT to open FREQ PREF SELECTION REFERENCE A SETTING 60Hz lt STOre And Exit gt 2 REFERENCE Press ENT and or to access and change Reference value to A or B and ENT 3 SETTING Press ENT and f or to access and change Frequency SETTING to either 50 Hz or 60 Hz and ENT to set it 4 Highlight lt STOre And Exit gt with the cursor and press ENT to install the new value s Auto Shutdown 1 From the Main Menu highlight Auto Shut down and press ENT to open AUTO SHUTDOWN Time Interval 5min lt STOre And Exit gt 2 Press ENT and or to adjust the Auto Shut down feature OFF or to one of the time intervals OFF 5min 16hr and ENT to set it 3 Highlight
58. r to lt STOre And Exit gt and press ENT 5 When finished adjusting the 928A clock features or to quit for any reason press ESC to leave the Autolog setup Autolog Time Mode The Autolog Time Mode is set when you set up the Time features See Time Adjustment Note check the 928A Time and Date for accuracy prior to starting the Autologging To adjust time and date see pages 20 and 21 Basic Data List Channel A magnitude Channel B magnitude Power Factor Q VA VAR Watt Relative Phase B to A Frequency Frequency Deviation Frequency Rate Channel A Flicker Channel B Flicker 64 Mlink Software Tutorial Introduction This tutorial was written to assist you in using Mlink application software written specifically for the Model 928A Mlink application software provides you with the following functions e Uploading CT Profiles e Configuring Power Quality Triggers e Downloading Data Records e Configuring Custom User Screens e Uploading New 928A Firmware CT Profiles are current probe characterization files stored in the Model 928A that improve their ac curacy Download Mlink Download the latest version of Mlink at the following link or if necessary contact Arbiter Systems at the information listed on page ii http arbiter com support downloads software updates php and select Mlink 928 Installing USB Driver Before using Mlink you will need to load USB Virtual COM Port drivers on your pc
59. ribed in the previous section However TRIG is more gen eral and flexible than PQ and does not conform to IEC 61000 4 30 paragraph 5 4 4 Viewing Triggers Press 2nd gt TRIG to view the Trigger Events screen Press f or to move through the record list ACTIVE TRIGH 1 INACTIVE May 19 2005 DATE May 19 2005 16 57 29 400 TIME 16 57 31 750 CH A MAG TYPE CH A MAG it X lt LIMIT Limit X lt LIMIT kkkkkkk MAX 109 689 1 of 8 REC 2 of 8 AVAIL RECS 29646 AVAIL RECS 29646 In the screen shots above REC 1 of 8 indicates the date and time that TRIG 1 first became active i e triggered note that no input signal levels are recorded REC 2 of 8 shows the date and time TRIG 1 returned to normal limits and became inactive i e non triggered Notice that REC 2 of 8 also indi cates a MAX or MIN value of the input signal during the time while the trigger was previously active In this example the Limit was set to 110 00 and the lowest value recorded during this event was 109 689 volts at the date and time indicated 54 Configuring Triggers Note that you can only configure TRIG from the 928A itself not in Mlink To configure TRIG press 2nd gt TRIG gt 2nd gt MENU Once in this menu step through each condi tion and view or edit any value There are 8 individual triggers available TRIGGER SETUP Trigger Signal INACTIVE Logic X lt LIMIT Limit 110 00 Ref Dwell lt STOre And Exit gt
60. ser screen f2 to f6 are currently unused 95 LCD Display adjust key press to access the display configuration menu Allows control of both contrast and backlighting LOG Log key press gt to display auto log data based on start and stop time and date Use Download Log Records in Mlink to retrieve records to computer menu Menu key press gt EN to access the various 928A systems configuration screens Gi MIN MAX key press gt GD to cycle through the four different measurement modes min imum maximum average and normal measurement mode Short term flicker press to display Pst flicker for a 10 minute average Recall Data key press to list data saved in flash memory when using the key Time key press to view or adjust the time on the Real Time Clock Integration key press to view a progressive plot of the signal SOURCE defined by pressing 2nd gt AXIS and changing the input signal defined under SOURCE Scaled by sample time upper and lower limits tim Graphical Harmonics press to display har monics in graphical form Press C or to peruse the list of graphical harmonics 96 CT Input Connector 928A Current Input Connector The 928A Channel A and B Current Inputs allow two types of output signals from the CT voltage or cur rent These CT output signals are limited to 1 2 Vrms and 1 2 Arms Pin locations and their descriptions for these two connectors are given in the
61. set and moving to the next item Use STO in lieu of highlighting lt STOre And Exit gt and pressing ENT When Recording Data The Model 928A stores records according to the date and time running in the internal clock Before mea suring check the clock for the correct time in the case that it has drifted or was inadvertently changed See TIME and DATE on pages 20 and 21 for more infor mation on setting the time and date When Configuring Functions To configure settings in the 928A generally you will press 2nd gt MENU while in some measurement mode e g VI After changing any settings press STO to install the new value s in memory and leave that menu Also highlight lt STOre And Exit gt then ENT to perform the same function as STO 19 TIME View or Set Time Viewing the Time Press 2nd gt TIME to view the time 23 59 59 Adjusting the Time 1 While viewing the time press 2nd gt MENU to access the time adjust screen SET TIME lt STOre And Exit gt 2 Press t or to move between fields and ENT to enter the Time value field you want to change 3 Using the f or or number keys adjust the de sired time value and press ENT to store Make any additional changes 4 When finished highlight lt STOre And Exit gt and press ENT to install new values and return to viewing the time 5 Press ESC to exit the time screen 20 DATE View or Set Date Viewing the Date Press 2nd g
62. so caution for CT probe use on page 4 No Direct Connection to Current Terminals WARNING CONNECT ONLY CT PROBE OUT PUT TO CURRENT TERMINALS ON 928A Dam age to the Model 928A current input may result if a current or voltage is connected directly to the 928A current terminals Maximum input to channel A or B current terminals is 1 2 Arms or 1 2 Vrms depending on the type of current probe connected 28 Using the MN352 Current Probe Connect the CA0027200 accessory voltage output CT cable between Channel A or B current input connector on the Model 928A and the safety sockets on MN352 Observe the polarity markings for correct reading WARNING Always remove the clamp from the cir cuit under test before connecting disconnecting the accessory cable at either end Safety Socket Output Polarity V red left V black right End View Line Load Input Polarity Marking Top View Side View 29 CT Characterization Files With each CT probe Arbiter Systems provides a char acterization file or Profile that improves the ac curacy for current measurements Before using the probe the profile must be uploaded to the Model 928A using Mlink software and configured in the Model 928A The Model 928A stores up to five CT profiles To Obtain the CT File 1 Connect to the Arbiter Systems website at the fol lowing link http arbiter com support downloads ct characterization files php
63. t DATE to view the date Oct 06 2010 Adjusting the Date 1 While viewing the date press 2nd gt MENU to access the date adjust screen SET DATE MONTH DAY YEAR 010 FORMAT MMM DD YYYY lt STOre And Exit gt 2 Press t or to move between fields and highlight the value you want to change Press ENT to enter date value 3 Press t 4 or number keys to adjust the desired date value and ENT to store 4 When finished configuring the date highlight lt STOre And Exit gt and press ENT to install new values and return to viewing the date 5 Press ESC to exit the date screen 21 Using the Input Channels This page describes four steps in setting up and using channels A and B for voltage and or current 1 Configure the Channels see next page In this step you will set up how the channels mea sure Configure Channels A and B scaling for reading any voltage or current signal Once these are set up you should be able to select the chan nel and begin measuring Normally you would not keep changing these values However if you change to a different CT then you would need to configure this step again 2 Select the Channel In this step you deter mine what each channel is measuring Lets say you want to measure voltage on Channel A and current on Channel B To set this up press 2nd gt AV to set Channel A for voltage and press 2nd gt BI to set Channel B for current If you want to set up bo
64. t the USB cable between the 928A and the computer 2 Start Mlink and check for a green connection light If red go back to Startup USB Con nection 3 Click the Configure Power Quality button and check to see if the Settings tab is on top Settings Definitions Profile Select the Profile number 1 5 in the drop down window at the top and type in a profile name for Description Declared Input This is the same as the nominal value being measured For example 120 i e Vrms It is also used as the initial condition for a sliding reference Hysteresis Select a value for Units Voltage or Current that represents the allowable Hysteresis e g 5 000000 in Figure 12 Reference Format Select either Absolute or Sliding Choose Absolute if you want the Limit to be fixed for Limit Format as either absolute or percent Choose Sliding as the Reference Format if choosing any the Limit Format as Percent and want the Limit to change gradually Sliding Reference is defined with a 1 minute time constant Hysteresis Format Select Absolute or Percent Units Select the appropriate input signal either Voltage or Current 77 Configure Point Limits Mlink allows you to set up ten point limits for each of the five profiles Point Limits allow you to setup dif ferent stages of triggering tailored to monitor voltage or current sags and swells Set up each point limit in the same manner and p
65. th channels to measure current then press 2nd gt Al to set Channel A for current press 2nd gt BI to set Channel B for current Note You must press the appropriate channel selection keys to correctly measure the desired function 3 Choose the Measurement Mode For exam ple press to display voltage and or current values 4 Connect the Equipment To measure con nect the leads between the 928A and the circuit under test 22 Configuring Channels A and B Configure Channels A and B for both current and voltage through this menu Four possibilities exist Ch A V Channel A measuring a voltage Ch A Channel A measuring a current Ch B V Channel B measuring a voltage Ch B Channel B measuring a current You can completely configure all these possibilities at one time from the Channel Configuration menu Voltage Ch A V 1 Press VI to open the measurement mode 60 000 Hz 123 45 1 2345 8 59 2 Press 2nd gt MENU to open the configuration screen for Channels A and B CHANNEL CONFIGURATION Ch A V Ch A I Ch B V Ch B I 3 Press f or to highlight the channel and ENT to open the specific Channel configuration screen In this example Ch A V sets the voltage mea surement parameters for Channel A 23 4 The display should change to the Ch A VOLT AGE CONFIG screen The configured items for voltage are Input Ratio and Phase Offset Ch A VOLTAGE CONFIG INPUT RATIO 1 00 PHASE
66. ting system should go looking for the drivers and load them This may take some time so be patient Check the Arbiter web site link below for additional information Drivers for Windows 7 Mlink has been tested successfully using Windows 7 Pro in 64 bit mode Check the Arbiter website link below for additional information Software Link http www arbiter com 67 Installing Mlink Load the Mlink installation file on your computer and either double click on the file or select Start gt Run and browse to locate the Mlink self installation file Select the Mlink self installing program and begin the installation See Figure 5 A ARBITER EEA install Power Sentinel Mlink SYSTEMS Choose the folern nich to instal Poner Sentinel irk Setup will install Power Sentinel Mlink in the following folder To install in a different folder click Browse and select another folder Click Next to continue Destination Folder C Program Files Power Sentinel Mlink Browse Space required 11 5MB Space available 4 3GB er gt Cancel Figure 5 Mlink Installation Screen Connecting to the 928A Prior to starting Mlink make sure that 1 The 928A is powered ON 2 The USB cable is connected between the pc and the 928A Startup USB Connection When starting Mlink for the first time you may be greeted with the connection window shown in Figure 6 and an opportunity to select a COM port This selec 68 tion is ne
67. tton or type in another filename and click Save A Download records window should display the progress or will say Nothing to Download Wait for the download to finish and click OK to close the Download Triggers window 75 Configure Power Quality Use this section to assist you in configuring the 928A to detect sags and swells by using Point Limits similar to a CBEMA method Make sure to review the section entitled Power Quality Sags and Swells on page 48 Figure 4 illustrates how progressive limits over speci fied time intervals can be applied to detecting sags and swells There are two separate setup screens in Mlink for configuring Power Quality triggering in the 928A the first screen is tabbed Settings and the second is tabbed Point Limits These are depicted in Fig ures 12 and 13 The Settings screen sets up some basic things about the measured signal and how the point limits are com pared to it Check through the values listed in the screen shot illustrated in Figure 12 and compare them with the definitions on the following pages Configure Power Quality Profile 1 iad Settings Point Limits Description one Declared Input 120 000000 Hysteresis 0 010000 Reference Format Sliding Hysteresis Format Percent Units voltage Cancel OK Figure 12 Power Quality Settings 76 Power Quality Settings 1 Press ON to start the 928A and connec
68. ty silicone insulated fine stranded wire for durability and safety Voltage Output CT Lead Set CA0027200 voltage output This accessory current lead set connects directly between a Model AP0012300 CT or similar voltage output CT and the Model 928A 85 using safety banana connectors It is constructed of high quality silicone insulated fine stranded wire for durability and safety Standard CT AP0012300 100 1 clamp on CT 150 A 10 mV A standard banana connectors Optional CT AP0001300 clamp on CT AEMC SR601 1000 1 1000 Arms 660 Vrms 1 mA A shrouded banana connec tors Requires CT cable assembly CA0027100 Voltage Measurement For voltage measurement use the AP0009700 voltage lead set This lead set includes Arbiters professional lead set material and voltage probe kit accessories for connecting to a variety of circuit connections Soft Carrying Case For carrying the Model 928A and some accessories choose the HD0065200 Made from rugged polyester it provides two compartments for clamp on CT lead sets and manual USB Data Cable Use CA0026106 USB cable when connecting the Model 928A to a computer For configuring the Model 928A or downloading data from the flash memory module use Mlink software 86 Specifications Input Input Configuration The Model 928A has two identical measurement chan nels Channel A and Channel B Each input channel has a voltage input and a current input Current
69. uding loss of profits whether based on contract tort or other legal theory FOR THE FASTEST POSSIBLE SERVICE PLEASE PROCEED AS FOLLOWS 1 Notify Arbiter Systems Inc specifying the in strument model number and serial number and giving full details of the difficulty Service data or instrument return authorization will be pro vided upon receipt of this information If instrument return is authorized forward pre paid to the manufacturer If it is determined that the instrument is not covered by this war ranty an estimate will be made before the repair work begins if requested See Contact Information on page ii iv Arbiter Systems Inc Model 928A Power System Multimeter User s Manual Warranty Table of Contents Introduction Getting Started Operation Mlink Software Tutorial Functional Description Specifications Appendixes Index Copyright Arbiter Systems Incorporated November 2013 All rights reserved International copyright se cured PD0030900K vi Contents Introduction 1 SCOPE ee ee to A Ge ee poe An 1 Features stri hak teal Mee hoe oe da ah 1 Simple Measurement 2 Recording Data 0 2 Safety and Usage Information 2 Caution Max CT Input Level 2 Caution Direct Current Input 3 Measuring Safety and Usage 3 928A Starter Kit 4 Getting Started 5 Keyboard Operation 5 Primary Function Keys
70. urrent input sections are able to accept either 1 2 Arms or 1 2 Vrms max input This will accommo date either current or voltage output probes MUX and ADC The ADC is a 24 bit Texas Instruments ADS1251 sigma delta converter running at 10240 samples per second There are two multiplexers being used a 74HC4053 and a 74HC4052 The 4053 is being used to switch between the voltage and current channel in puts and the 4052 switches the source for current channels either a current CT maximum input 1 2 Arms voltage CT maximum input of 1 2 Vrms or gain of 20 84 DSP The DSP is a Texas Instruments TMS320VC33 120 and runs from 1 8 to 3 3 V power supplies The TMS320 will perform all of the DSP and control pro cessing reducing the parts count and power require ment Power Supplies The 928A will operate from four AA cells which can be either NiMH or Alkaline Rechargeable batteries may be recharged from a third party NiMH recharger available at many consumer outlets Also available is accessory Kit power adapter AP0011200 Accessories Arbiter Systems recommends the use of the following accessories for use with the Model 928A Current Measurement Current Output CT Lead Set CA0027100 current output This accessory current lead set connects directly between a Model AP0009800 CT or similar current output CT and the Model 928A current terminals using safety banana connectors It is constructed of high quali
71. ust be re turned to a service facility designated by Arbiter Sys tems Buyer shall prepay all shipping charges to Ar biter Systems and Arbiter Systems shall pay shipping charges incurred in returning the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to Buyer in a country other than the United States of America THE WARRANTY SET FORTH HEREIN CONSTITUTES THE ONLY WARRANTY OBLIGATIONS OF ARBITER SYSTEMS EXPRESSED OR IMPLIED STATUTORY BY OPERATION OF LAW OR OTHERWISE ARBITER SYSTEMS DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE AND BUYER EXPRESSLY WAIVES ALL OTHER WARRANTIES iii This limited warranty does not extend to any product which has been subject to I II Il IV Improper use or application abuse or operation beyond its rated capacity or contrary to the in structions in the operation and maintenance man uals if any Accident Repair or maintenance performed by Buyer ex cept in accordance with the operation and main tenance manuals if any and any special instruc tions of Arbiter Systems Modification without the prior written authoriza tion of Arbiter Systems whether by the substitu tion of non approved parts or otherwise The remedies provided herein are Buyer s sole and ex clusive remedies In no event shall Arbiter Systems be liable for direct indirect incidental or consequential damages incl
72. ven a positive sign then you should configure this in Phase Prefer ences in the Main Menu See page 16 under Phase Preferences Example from the figure above Suppose you are monitoring two signals with a voltage connected at Channel A voltage terminals and a current at Channel B current input terminal Then the current would be lagging the voltage by 60 degrees For additional details on phase conventions please see page 99 Appendix C Phase Conventions 35 PWR Active and Reactive Power To use the power measurement function on the 928A you must select one measurement channel for voltage and the other for current In this example Channel A is configured as voltage and Channel B as current Setup 1 Press 2nd gt AV to set Channel A to voltage and 2nd gt BI to set Channel B to current LINE 88988 B8868 LOAD Note in this figure voltage probes are con nected to Channel A and CT connected to Chan nel B 2 Press PWR and connect the probes to the circuit elements 3 Read the display 36 Display Definitions Active Power Watt 129 06 224835 React Power Var The display should indicate Active and Reactive power showing the effective power to a load and wasted power returned to the line The displayed units are Watts on the top and Vars on the bottom Determining Active Power Active power is calculated from the real components of the current and the v
73. y 39 preferences 34 phase preference 16 power ac adapter 8 battery 6 power factor 38 power ON OFF 6 power quality configure 76 configure point lim its 78 deactivate trigger 80 download records 81 point limit defn 78 settings 77 user profile 79 power supplies 85 power active determining 37 PQ events accessing 53 PQ key 48 PQ profiles 50 selecting 50 turning off 50 Pst key 47 PWR key 36 RCL key 59 reactive power 36 recall stored values 59 soft carrying case 86 specifications 87 ac power adapter 91 batteries 88 current 88 external power sup ply 89 general 90 105 environmental 90 MN352 CT probe 92 physical 90 input section 87 measurements 89 frequency 89 harmonics 89 phase angle 89 power amp energy 90 voltage amp current 89 waveform 90 operator interface 88 power req 88 voltage 88 standard CT 86 STO key 19 when configuring 19 when recording data 19 support request iv terminals current 12 measurement 10 voltage 11 time adjusting clock 20 title page v TRIG 54 triggers configuring 55 definitions 55 viewing 54 UP DOWN keys 14 upload CT profiles 72 new firmware 82 USB cable 86 startup 68 user interface 83 version manual v voltage measurement 86 warranty iil watt hour 40 WAV key 42 Wh key 40 106
74. z Accuracy 0 005 of reading Harmonics Input Channel A and B simultaneous Range 2nd to 50th 50 or 60 Hz fund Accuracy 0 1 THD 5 reading 89 Harmonics continued Display THD K factor Amplitude bar graph and individual harmonic magnitude and phase simultaneous Waveform Display Channel A and or Channel B Power and Energy Quantities Range 0 to 99999 MVA or MVAh 99999 MVAR or MVARh 99999 MW or MWh 1 0000 PF lead or lag Accuracy 0 1 of VA for VA VAR and W 0 001 PF General Physical Size 200 0 x 104 2 x 37 4 mm 7 9 x 4 1 x 1 5 in Weight 18 oz 928A only with batteries Environmental Temperature Operating 10 to 50 C Nonoperating 40 to 75 C Humidity Noncondensing 90 AC Power Adapter Part number AP0011200 For benchtop or continuous use with available line power use the AP0011200 AC Power Adapter It provides a regulated 7 Vdc at up to 800 mA to the 928A Input Connector Input Voltage Input Current Input Frequency Output Voltage EMI MTBF Operating Temp Storage Temp Humidity Weight 5 5 x 2 0 mm center pos 90 Vac to 264 Vac lt 0 5 Arms at 90 Vac Input 47 to 63 Hz 7 Vdc at 800 mA FCC Part 15 Class B when tested with a resistive load both conducted and radiated 50 000 hours or greater at 25 C 0 to 70 C 40 to 80 C 0 to 90 Relative Humidity 90 g MAX 91 MN352 Current Probe Part nu

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