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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 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.

Summary of Contents for 928A

Page 1: ...MODEL 928A USER S MANUAL Arbiter Systems Inc Paso Robles CA 93446 U S A ...

Page 2: ...s 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 ii ...

Page 3: ...ss it receives written notice of any claimed defect within the earlier of Thirty days of discovery by Buyer or One year from the date of delivery For warranty service or repair products must 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...

Page 4: ...vided herein are Buyer s sole and ex clusive remedies In no event shall Arbiter Systems be liable for direct indirect incidental or consequential damages including 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 detai...

Page 5: ...nual Warranty Table of Contents Introduction Getting Started Operation Mlink Software Tutorial Functional Description Specifications Appendixes Index Copyright Arbiter Systems Incorporated January 2012 All rights reserved International copyright secured PD0030900J v ...

Page 6: ...vi ...

Page 7: ...nt Input 3 Measuring Safety and Usage 3 928A Starter Kit 4 Getting Started 5 Keyboard Operation 5 Primary Function Keys 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 8 Measurement Terminals 10 Voltage Terminals 11 Current Terminals 12 vii ...

Page 8: ...nnels 22 Configuring Channels A and B 23 Using the MN352 Current Probe 29 CT Characterization Files 30 Operation 31 Introduction 31 Making Measurements 32 VI Voltage and Current 32 φF Phase and Frequency 34 PWR Active and Reactive Power 36 PF Power Factor Apparent Power 38 Wh Watt hour 40 WAV Waveform 42 HRM Numerical Harmonics 44 Graphical Harmonics 45 Flicker Information 46 FLK Instantaneous Fli...

Page 9: ...vers for Windows Vista 67 Drivers for Windows 7 67 Installing Mlink 68 Connecting to the 928A 68 Startup USB Connection 68 Mlink Main Window 71 Available Functions 71 CT Profiles 72 To Install Profiles 72 To Erase Profiles 73 Configure User Screens 73 Download Trigger Records 75 Configure Power Quality 76 Power Quality Settings 77 Configure Point Limits 78 Point Limit Definitions 78 User Profile 7...

Page 10: ... Measurement 86 Soft Carrying Case 86 USB Data Cable 86 Specifications 87 Input 87 Input Configuration 87 Voltage 88 Current 88 Interface 88 Operator Interface 88 Power Supply Requirements 88 Batteries 88 External Power Supply 89 Measurements 89 Voltage and Current 89 Phase Angle A to B 89 Frequency 89 Harmonics 89 Waveform 90 Power and Energy Quantities 90 General 90 Physical 90 Environmental 90 ...

Page 11: ...52 Current Probe 92 Probe Specifications 92 Keypad Definitions 93 Primary Keys 93 Secondary Keys 95 CT Input Connector 97 928A Current Input Connector 97 CT Cable Connector 98 Phase Conventions 99 CE Mark Certification 101 xi ...

Page 12: ...xii ...

Page 13: ...n 68 6 Mlink Connection Window 69 7 Windows XP COM Port Assignment 70 8 Mlink Main Window 71 9 Load CT Profiles 72 10 Configure User Screens Window 74 11 Download Triggers Window 75 12 Power Quality Settings 76 13 Power Quality Point Limits 79 14 Upload Firmware Window 82 15 928A Current Connector Layout 97 16 CT Cable Connector side view 98 17 CT Connector End View 98 xiii ...

Page 14: ...xiv ...

Page 15: ... 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 650...

Page 16: ...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 incorrec...

Page 17: ...128x64 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 point...

Page 18: ...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 Supply AP0009700 Single Phase Voltage Lead Set AP0012300 100 1 Clamp On CT 150 A 10 mV A ...

Page 19: ... 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 ...

Page 20: ...ivity 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...

Page 21: ...ery 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 battery terminals is to rub them periodically with a cotton tipped swab moi...

Page 22: ...ting 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 ...

Page 23: ...Figure 2 Bail Assembly attached to lower holes Figure 3 Bail Assembly attached to upper holes 9 ...

Page 24: ...re a voltage select a set of voltage terminals found below the current input connectors 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 po...

Page 25: ...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 Press 2nd AV to measure voltage at Channel A Press 2nd 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...

Page 26: ...ntering the CT Output Type either voltage or current CT Ratio and Phase Offset Press 2nd AI to measure current at Channel A Press 2nd 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 Sel...

Page 27: ...nd 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 1 Press 2nd LCD to open the LCD configuration screen 2 Press 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 Highligh...

Page 28: ...ormation see Mlink Software Tutorial starting on page 65 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 ductory message that describes the 928A Press any of the main measurement keys e g VI to bypass the splash screen Up and Down Arrows Press or to step through values in configuration me...

Page 29: ... through the Main Menu or in context Main Menu 1 Press 2nd MENU 2nd MENU to open the main menu 2 Press ESC to backup to previous menus 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 3 Press ESC to backup to previous menus 15 ...

Page 30: ... 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 4 RANGE Press ENT and or to select the range value to either 180 or 0 360 and ENT to set it 5 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 functio...

Page 31: ...quency SETTING to either 50 Hz or 60 Hz and ENT to set it 4 Highlight STOre And Exit 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 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 STOre And Exit with the cursor and press...

Page 32: ...alibration certificate highlight this selection and press ENT to view the calibration infor mation Without the certificate the menu item will not appear Menus in Context To access these menus you will need to be viewing the specific function and press 2nd 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 w...

Page 33: ... of highlighting STOre And Exit 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 config...

Page 34: ... screen 2 Press or to move between fields and ENT to enter the Time value field you want to change 3 Using the or or number keys adjust the de sired time value and press ENT to store Make any additional changes 4 When finished highlight STOre And Exit and press ENT to install new values and return to viewing the time 5 Press ESC to exit the time screen 20 ...

Page 35: ...t screen 2 Press or to move between fields and highlight the value you want to change Press ENT to enter date value 3 Press or number keys to adjust the desired date value and ENT to store 4 When finished configuring the date highlight STOre And Exit and press ENT to install new values and return to viewing the date 5 Press ESC to exit the date screen 21 ...

Page 36: ...s 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 AV to set Channel A for voltage and press 2nd BI to set Channel B for current If you want to set up both channels to measure current then press 2nd AI to set Channel A for current press 2nd BI to set Channel...

Page 37: ... Ch B I 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 2 Press 2nd MENU to open the configuration screen for Channels A and B 3 Press or to highlight the channel and ENT to open the specific Channel configuration screen In this example Ch A V sets the voltage m...

Page 38: ...ield 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 STOre And Exit and press ENT to install any new values and return to the Channel Con figuratio...

Page 39: ...ct Input Type Input Ratio Phase Offset and Low Range Mode values as required CT Select Selects either USER or M where M selects a calibrated CT serial number e g M00001234 USER selects one user calibration con stant M 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 u...

Page 40: ... 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 m...

Page 41: ...Amp MAXIMUM OUTPUT VOLTAGE AC Input AC Output Ratio 75 A 10 mV 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 ...

Page 42: ...Most of the measured values available from the 928A are derived from the voltage current and frequency measurements Most of the advance functions using these basic measurements are found in the next section entitled Operation Current Terminals Caution No Direct Current or Voltage Input do not connect a voltage or current directly to the current terminals of the 928A These terminals are intended fo...

Page 43: ...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 circuit under test before connecting disconnecting the acces sory cable at either end 29 ...

Page 44: ... 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 ...

Page 45: ...guring 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 Fu...

Page 46: ...sure voltage using Channel A then you would press 2nd 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...

Page 47: ... 000 Hz measured line frequency 123 45 measured channel A signal in volts 1 2345 measured channel B signal in amps B I 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 ...

Page 48: ... the circuit elements 3 Read the values on the display 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 c...

Page 49: ...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 given 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 voltag...

Page 50: ...or current In this example Channel A is configured as voltage and Channel B as current Setup 1 Press 2nd AV to set Channel A to voltage and 2nd BI to set Channel B to current 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 ...

Page 51: ...ctive 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 voltage Caution For current probe use see CT Probe Use on page 4 37 ...

Page 52: ... current In this example Channel A is selected as voltage and Channel B as current Setup 1 Press 2nd AV to configure Channel A for volt age and press 2nd BI to configure Channel B for current 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 ...

Page 53: ...isplay 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 Caution For current probe use see CT Probe Use on page 4 39 ...

Page 54: ...el 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 AV to configure Channel A for volt age Press 2nd 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...

Page 55: ...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 ...

Page 56: ...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 2 Press the appropriate Signal Selection key in or der to measure the signal properly for example press 2nd AV to select Channel A to measure voltage 3 Connect the probe s between the 928A and the circuit under test 4 Press WAV and read the Channel A graph on the display ...

Page 57: ...Channel B Combined Caution For current probe use see CT Probe Use on page 4 43 ...

Page 58: ... AV to measure voltage on channel A 2 Press HRM and connect the meter probes be tween the 928A and the circuit under test 3 Read the display this example indicates channel A voltage magnitudes fundamental through the 7th harmonic and phase angle in degrees 4 Press or to view the full range of tabulated harmonic values from the fundamental to the 50th harmonic Press the arrow keys to move through t...

Page 59: ...ppropriate Signal Selection key in or der to measure the signal properly for example press 2nd AI 2 Press 2nd and connect the meter probes between the 928A and the circuit under test Read the display 3 Press or to move the cursor to select the desired harmonic e g in display above cursor identifies 5th harmonic for channel A Pressing the arrow keys after reaching the last harmonic entry on the scr...

Page 60: ...oups 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 continuou...

Page 61: ...ect voltage for measurement channels A and or B 1 Press 2nd AV and or 2nd 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 ...

Page 62: ...imits 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 t...

Page 63: ...ycles of the nominal frequency Configuring point limits is straightforward 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 ove...

Page 64: ...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 records directly from flash on the 928A by press ing PQ Changing the PQ profile will not disturb records already stored in flash me...

Page 65: ... 2 Press ENT to highlight the profile name e g PROF 1 and or to select the desired PQ profile name Press ENT to assign the profile name and to move to VIEW POINTS 3 Press ENT with cursor on VIEW POINTS to open the Point Limit viewing screen or highlight STOre And Exit 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 Pr...

Page 66: ...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...

Page 67: ...Q Event List 4 Use Mlink software to download PQ records in CSV format to view in spreadsheet form 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 Start Stop Times MAX MIN values within Start and Stop Times Pre...

Page 68: ...orm to IEC 61000 4 30 paragraph 5 4 4 Viewing Triggers Press 2nd TRIG to view the Trigger Events screen Press or to move through the record list 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 tr...

Page 69: ...T 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 Limit x Limit x Limit x ref Limit x input signal value Limit Numerical value compared to signal floating point Ref A no...

Page 70: ...nel 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 and connect the measurement probes to the circuit under test 3 Read the display NOTES If you configure channel A as current and channel B as voltage then the units will be...

Page 71: ... 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 NOTES If you configure channel A as current and channel B as voltage the units will be in ohms and degrees I...

Page 72: ... 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 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 ...

Page 73: ... Records are stored according to number type date and time as shown in the example below Viewing Procedure 1 Press 2nd RCL to view the Recall Stored Data screen 2 Use 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 4 Press ESC to return to the Recall Data screen and select a new record Press ES...

Page 74: ...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 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 A...

Page 75: ...ax Maximum plotted value on display Axis Min Minimum plotted value on display Procedure 1 Press 2nd AXIS to open the Integration Key configuration screen 2 Press or to locate the desired field and ENT to enter the variable field 3 Press or number keypad to change the re quired values s and press ENT to store value 4 Finally highlight STOre And Exit with the cursor and press ENT to save any changes...

Page 76: ...econds Stores up to 6592 records maximum Viewing Autolog Information To view Autolog information press 2nd LOG and the screen will display some basic information about the data logging features 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 MENU Viewing Autolog Data...

Page 77: ...d MENU The Autolog Setup screen should ap pear 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 3 Adjustment procedure Use the arrow keys to lo cate the desired field value and press ENT to 63 ...

Page 78: ...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 Frequen...

Page 79: ...for the Model 928A Mlink application software provides you with the following functions Uploading CT Profiles Configuring Power Quality Triggers Downloading Data Records Configuring Custom User Screens Uploading New 928A Firmware CT Profiles are current probe characterization files stored in the Model 928A that improve their ac curacy ...

Page 80: ...fter 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 search...

Page 81: ...ws 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 operating 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...

Page 82: ...ng program and begin the installation See Figure 5 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...

Page 83: ... 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 app...

Page 84: ...s 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 Com puter Manage Device Manager Ports COM LPT USB Serial Port COM X Right Click Properties Port Settings tab Advanced button COM Port Number select an available port up to 9 See Figure 7 Figure 7 Windows XP COM Port Assignment 70 ...

Page 85: ...hat strobes notifying you of the con nection status When finished close Mlink by clicking the Exit button 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...

Page 86: ...iles Window includes Probe Title Nominal Ratio 12 Current Points Error Magnitudes Error Phases To Install Profiles 1 Download CT profile from Arbiter website go to Service Support Downloads 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 connect the USB cable between the 928A and the computer 3 Start Mlink and ch...

Page 87: ...on 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 f1 successively If your requirements change you can run Mlink a...

Page 88: ...ser 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 ...

Page 89: ... 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 Trigger Records button 4 If the 928A has Trigger Records to download a Save Log As window should appear with supplied filename for the data Click the Save button or type in another filename and click Save 5 A Download records window should display the progress or will s...

Page 90: ...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 scre...

Page 91: ...al 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 a...

Page 92: ... 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 volt...

Page 93: ... 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...

Page 94: ...c 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 be...

Page 95: ...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 Power Quality Records but ton 4 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 5 A Download records window s...

Page 96: ...the Arbiter web site or by contacting Ar biter Systems technical support 1 Start Mlink and select Main 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 Figure 14 Upload Firmware Win...

Page 97: ...cluding 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 configurin...

Page 98: ...e 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 current 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 AD...

Page 99: ...pter 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 quality...

Page 100: ...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 Ca...

Page 101: ...rent input Current 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 ...

Page 102: ...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 ...

Page 103: ...eading 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 1 typical Frequency Range 50 or 60 Hz 5 Hz 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 ...

Page 104: ...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 ...

Page 105: ...nput Connector 5 5 2 0 mm center pos Input Voltage 90 Vac to 264 Vac Input Current 0 5 Arms at 90 Vac Input Input Frequency 47 to 63 Hz Output Voltage 7 Vdc at 800 mA EMI FCC Part 15 Class B when tested with a resistive load both conducted and radiated MTBF 50 000 hours or greater at 25 C Operating Temp 0 to 70 C Storage Temp 40 to 80 C Humidity 0 to 90 Relative Humidity Weight 90 g MAX 91 ...

Page 106: ...50 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 ...

Page 107: ...sary value during con figuration menus Secondary key press to access any of the blue secondary keys located above 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 i...

Page 108: ... on and off Power Factor 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 Reactive Power key press to display the power in Watts and Vars Store key press to 1 to write current measurements to the flash memory card or 2 to as sign values ...

Page 109: ...tion 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 m...

Page 110: ...urement 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 AXIS and changing the inpu...

Page 111: ...nputs 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 drawings and photos that follow Figure 15 928A Current Connector Layout ...

Page 112: ...CT Cable Connector Figure 16 CT Cable Connector side view Figure 17 CT Connector End View 98 ...

Page 113: ...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 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 ...

Page 114: ...100 ...

Page 115: ...CE Mark Certification ...

Page 116: ... Referenced 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 Signed Signatory Bruce H Roeder This certificate declares that the described equipment conforms to the applicable requirements of the directives on Ele...

Page 117: ...2 setup 63 time mode 64 AXIS key 61 B A key 57 bail assembly 8 battery replacement 7 use 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 f1 f6 keys 14 firmware version 15 flash utilities 18 Flicker definitions 46 instantaneous 47 Plt 47 Pst 46 103 ...

Page 118: ...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 φF 93 A B 93 AI 95 AV 95 AXIS 95 B A 95 backspace 95 BI 95 BV 95 DATE 95 ENT 93 ESC 94 f1 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 P...

Page 119: ...ead lag display 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 3...

Page 120: ...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 iii watt hour 40 WAV key ...

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