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MODEL 928A

1. dSa uiod BuneoH 2 Press and connect the probe s between the 928A and the circuit elements 3 Read values on the display Display AV 60 000 Hz 123 45 1 2345 Bl Ph Operation 29 60 000 Hz 123 45 1 2345 8 59 Description channel A with units in volts measured line frequency measured channel A signal in volts measured channel B signal in Amps Channel B with units in amps Phase angle of channel B signal relative to channel A 30 Operation F Phase Frequency Measurement 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 measuring If necessary see page 20 Configuring Channels A and B 2 Press and connect the probes to the circuit elements Deg 9 45 60 005 Frequency 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 lagging 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
2. Load Line Input Polarity Marking Top View Side View 26 Getting Started 27 Operation Information in this section provides more advanced details on configuring and operating specific functions of the 928A LINE AEBBB HEHBBB aas Floating Point DSP LOAD Certain fundamental procedures are covered in the previous chapter called Getting Started If you have not previously reviewed this section it would be good to do so at this time especially on Configuring Channels A and B Some of the more advanced features covered in this section are included in the list below 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 28 Operation Making Measurements VI Voltage and Current Measurement 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 Cra 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 configured properly If necessary refer to Getting Started page 20 Configuring Channels A and B
3. iese see see ske ee ee ee ee 3 PIE EE RE N ER 3 CT Characterization Service iese ee ee RA Re 3 Getting Started iis cert ccereticcctteceeneccck 4 Keyboard Operation eise ee ee Re ee Re Re Re 4 Primary Function Keys sesse ese ese see ske ee ee ee ee Ge Ge ke 4 Secondary Function Keys sesse ese see ee ee ee ee ee 4 Navigating Menus to Configure iese esse see ee ee 4 Power Onand OPE ssis soer gt Auto Power Shutdown ccececessceseeseeseeseeeeeneeneens 5 Battery Power Only esse see ee ee Ge Ge Re Ge Re ke 5 AG Power A dapter vs eise nian ch SR Re EE EE ek se eg 5 6E RE N EE EE 6 Battery Replacement 000 cece see se ee ee Ge ee ee ee 6 Measurement Terminals sesse esse see ske se ke ee ee 7 MEE id EA EN RE EE 7 Voltage Terminals 660 Vrms MAX esse seeks ee 8 Current Terminals 1 2 Arms 1 2 Vrms max 9 OD BATCCy Sirsa GE EE 10 MIN MAX Key esse ese sesse se se ek Gee Gee Re Ge Re ee Re ee 10 LCD Display Control KEY ese se se ee ee ee 10 Function Keys fl f6 esse se se ee ke GR Re Re 11 fl Custom User Sereen ees ee ee 11 viii Contents Splash Screen EE cen anioia 11 Up and Down ATTOWS ees see see se se ee ee Re ee ee ge 11 MENU AE EE 12 IE Mid ie ERA EE N 12 Firmware Version sesse see see see ee ee ee Ge Ge ee 12 Phase Preference iis see see se ee Re Ge ee Re Ge ee ke 13 Frequency Preference eerren 14 Auto Shutdown ese se ee ee Re ee
4. Power Factor amp Apparent Power key read the Power Factor and Apparent Power in Volt Amps Power Quality key currently unused will report valuable data concerning sags and swells interruptions and data records Active amp Reactive Power key read the power in Watts and Vars Store key this key has two major functions 1 to write current measure ments to the flash memory card and 2 to assign values during configuration this is the same as highlighting lt STOre And Exit gt and pressing Voltage Current key view the voltage and or current signals input to channels A and B fi p JES Appendix A Keypad Definitions 83 Waveform key view the signal wave forms at channels A and B as A and B A or B Watt hours key press once to read the current energy values Press again to view Q hours Backspace key move left in any configu ration screen to erase any numerical value to the left or to restart a process like Integration graph Also press to enter a negative number during configuration Up and Down arrow keys browse through values in menus browse through function values like harmonics or for choosing specific records held in memory Secondary Keys AV AXIS B A Channel A current selection selects channel A for current measurement Channel A voltage selection selects channel A for voltage measurement Axis key press the axis key to set up
5. arrow keys to toggle it to the desired value and press ENT For complete details on Main Menu Configuration see page 13 under Phase Preference Note that the 928A is very flexible and always compares the Operation 31 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 conven tions as used in the Model 928A In this example the inputs measured by the 928A may be either voltage or current signals 60 Phase Example SA Signal at Channel A SB Signal at Channel B Phase Angle Signal A to B 60 SB is delayed from SA by 60 degrees or approximately 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 Preferences in the Main Menu See page 13 under Phase Preferences Example from the figure above Suppose you are monitor ing 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 87 Appendix C Phase Conventions 32 Operation PWR Active and Reactive Power Use this mode to measure Active and Reactive Power To use the power
6. 5 000000 Reference Format Bbsee sl HysteresisFormat abses units ote od Cancel 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 Connection 3 Click the Configure Power Quality button and check to see if the Settings tab is on top 4 Profile Select the Profile number 1 5 in the drop down window at the top and type in a profile name for Description 5 Declared Input Leave this value blank unless you are choosing Percent as a Reference It is also used as the initial condition for a sliding reference 68 Model 928A Power System Multimeter 6 Hysteresis Select a value for Units Voltage or Current that represents the allowable Hysteresis e g 5 000000 in screen shot 7 Reference Format Select either Absolute or Sliding NOTE Choose Sliding as the Reference Format only if choosing the Limit Format as Percent Sliding Reference is defined with a 1 minute time constant 8 Hysteresis Format Select Absolute or Percent 9 Units Select the appropriate input signal Units either Voltage or Current User Profile One selection named USER is available with one Point Limit that is only accessible from the 928A keypad See PQ Power Quality on page 46 for information on setting up the USER profile OFF Deactivate PQ Trigger When not recording select OF
7. Any one profile may consist of up to 10 Point Limits with each point defined over integer multiples of 1 2 cycle of the nominal frequency Note the PQ function measures RMS values only PQ Profiles The Model 928A can store up to 5 different PQ profiles that are configured and uploaded into the 928A using Mlink software Each profile is a different configuration for measuring sags and swells Profiles are listed in the Model 928A as PROF 1 PROF 5 USER Profile Select USER to set one Limit Point directly in the 928A This selection is only available from 928A keyboard 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 Operation 45 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 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 To select a specific PQ profile see the next page under Selecting PQ Profiles 500 A Q w Q 200 Percent of Nominal Voltage RMS or Peak Equivalent No Damage Region 001c 01c 1c 10c 100c 1us ims 3ms 20ms 0 5s 10s Duration in Cycles c and Seconds s 46 Operation W
8. 1 1 Memory 512 KB Flash Data User Setups Real Time Clock Approx 400 KB measurement data Specifications 77 Power Requirements Batteries Type 4 AA Cells alkaline or NiMH Operation 30 hours typical with alkaline cells 60 hours typical with NiMH External Power Supply Type 6 Vdc unregulated Measurements Voltage and Current Method True rms 3 kHz Bandwidth Accuracy 0 1 of reading voltage 0 1 of reading current CT errors Phase Angle A B Range 0 to 360 or 180 Accuracy 0 1 underrange lt 1 typical at TBD mArms Frequency Range 50 or 60 Hz 5 Hz Accuracy 0 005 of reading Harmonics Input Channel A and Channel B simultaneous Range 2 to 50 Harmonic 50 or 60 Hz fund Accuracy 0 1 THD 5 reading Display THD K factor Amplitude bar graph and individual harmonic magnitude and phase simultaneous 78 Specifications 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 190 x 101 6 x 32 64 mm 7 5 x 4x 1 285 in Weight 18 oz 928A only with batteries Environmental Temperature Operating 10 to 50 C Nonoperating 40 to 75 C Humidity Noncondensing Specifications 79 AC Power Adapter Part no AP0009400 For benchtop or continual use with available line power u
9. Deactivate PQ Trigger esse sesse esse esse ee 68 Configure Power Quality Point Limits 0 00 0 69 Point Limit Definitions 0 ese see ee ee ee 69 Download Log Records iese sesse ee ee ee ee ee 70 Downloading esns Ee ce ied alae 70 Download Power Quality Records iese see ee 71 Downloading ensien Uaioe ia ei 71 Uploading New Firmware e sesse see ses ese se ee Ge ee ee 72 Contents xi Functional Description ee RR RR Ee 73 User Interface cscs RE pees 73 BEER RR EA OE EN 73 ACCOSSOTIES EE EE EE N 74 Current Measurement esse see see ke ee ke 74 Optional C Tiea apnar e EES 75 Voltage Measurement 00 cece see se ee ee ee Ge Ge 75 Soft Carrying Case sesse se se ke Ge ke Re ee ee 75 USB Data Cable 00 eee see ee ee ee ee ee eg 75 Specifications es EKKE EE EER ENE AR nanne 76 iii RE Ed 76 Input Configuration esse se see ee ee ee ee Ge Ge ee 76 MEE OE EE ES 76 Gie RE EE cert 76 Intera CE ie vets EDE N E 76 Operator Interface ees sesse ee ee ee ee ee 76 Power Requirement i iss see se se ske Re GR Re ee Re ee 77 EE id OE AE EE sinais 77 External Power Supply eise ese se ee ee ee ee Ge ee ee ee 77 Measurements issie si RE Re De sede ur ie ede spe EE Pe 77 Voltage and Current esse see ske se se ke Re Re Re Re Re ee 71 Phase Angle AB esse ee se ke ee Ge ee ee ee 77 oi SR RE OE 71 Harmonics ees ee ke ee Re Re RA Re ee Re Re Re ee ee 77 Wavetorm i s EER ihe nhs 78
10. Input Connector The 928A Channel A and B Current Inputs allow two types of output signals from the CT voltage or current 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 drawing below 928A Current Input Connector Pin Designations names reflect the signal source 1 CT Output Current Dot Side 2 CT Output Voltage referenced to Pin 4 3 CT Output Current No Dot 4 CT Output Voltage Connected to cable shield on current cable Ca0027100 CT Cable Connector Connector Type Switchcraft TA4FL Release Retainer Button Guide eo 2 87 Appendix C Phase Conventions This appendix contains supplemental material for determin ing how the Model 928A responds to the various 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 display ON or OFF frequency source A or B and frequency 50 or 60 Hz The items below provide interpretation for these settings Switching Phase Preference to B effectively reverses the polarity of these settings Channel A Signal Channel B Signal Range Polarity Settine Resultant Setting a ee Reading 180 for Channel B lagging Channel A 60 180 for Channel B lagging Channel A 60 0 360 for Channel B lagging Channel A 300 0 360 for Channel B lagging Chann
11. display real time clock approximately 400 KB of flash for data storage and full time battery operation using common AA size NiMH or Alkaline cells User Interface The user interface consists of a 128 x 64 graphic LCD with backlight and 30 key silicone keypad Also included 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 designed to work with CTs up to approximately 1000 A To allow accurate measurements at low current levels lt 10A 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 performance Current Inputs are connected to the upper connectors and allow for voltage output and current output CTs 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 current input sections are able to accept either 1 2 Arms or 1 2 Vrms max input This will accommodate either current or voltage output probes 74 Functional Description MUX and ADC The ADC is a 24 bit Texas Instruments ADS1251 sigma delta converter running
12. equal to the specified maximum of 1 2 V Arms In this case 0 75 Arms being less than 1 2 Arms is safe to apply If using a voltage output CT you would be able to apply up to 1 2 Vrms to the Current Inputs Selecting a Channel Function To measure voltage at Channel A press av To measure current at Channel A press CAT To measure voltage at Channel B press ev To measure current at Channel B press Br NOTE Remember that if you wish to measure voltage or Current on a specific channel you must connect the appro priate test leads between the specific terminals to the circuit you want to measure If measuring voltage use the voltage terminals If measuring current use the current terminals Measuring Voltage and Current Most of the measured values available from the 928A are derived from the voltage current and freguency measure ments Most of the advance functions using these basic measurements are found in the next section entitled Opera tion Getting Started 25 Using the M3 Current Probe Connect the M3 current probe using the CA0027100 accessory current cable to the Channel A or B current input connector on the Model 928A and the safety sockets on M3 Observe the polarity markings for correct reading Warning Always remove the clamp from the circuit under test prior to disconnecting the accessory cable at either end Safety Socket ei CT Leads Polarity Marking Black End View
13. installation file Select the Mlink self installing program and begin the installation Power Sentinel Mlink 0 5 0 5 E 10l x A ARBITER Sects ies cams SYSTEMS oose the Folder in which to install Power Sentinel Mlink 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 Program Files Power Sentinel Mlink Browse Space required 11 5MB Space available 4 3GB Nullsoft Install System v2 06 here Cancel Connecting the 928A to a Computer 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 62 Model 928A Power System Multimeter Startup USB Connection When starting Mlink for the first time you may be greeted with the connection window shown below and an opportu nity to select a COM port This selection is necessary 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 Select a serial port x Permissions OK status al COMI True No PSM detected COM2 True No PSM detected COMS3 True No PSM detected z 4 gt Refresh Cancel O Connecting 1 To connect select the desired COM port number and click th
14. 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 to set Channel A to voltage and to set Channel B to current LINE AEBBB HERE OOOOOO OOOOOO OOOOOOD maa maasea Floating Point DSP LOAD Note in this figure voltage probes are connected to Channel A and CT connected to Channel B 2 Press and connect the probes to the circuit elements 3 Read the display Operation 33 Active Power Watt 129 06 22 833 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 voltage 34 Operation PF Power Factor amp Apparent Power Use this mode to measure Power Factor and Apparent Power To use the Power Factor and Apparent Power function 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 to configure Channel A for voltage and press to configure Channel B for current LINE OO roes e
15. set up the functions preferences and operating parameters of the 928A Access these menus through the Main Menu or in context Main Menu MAIN MENU Version Information Phase Preference Frequency Preference Auto Shutdown Data Flash Utilities Calibration Date Info 1 Press MENU MENU to open the main menu 2 Press 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 and read information SerNum 00000140 Main Processor 1 00 Aug 30 2005 x DSP Processor 1 00 Aug 29 2005 3 Press to backup to previous menus Getting Started 13 Phase Preference PHASE PREF SELECTION REFERENCE POLARITY RANGE LEAD LAG DISPLAY lt STOre And Exit gt From the Main Menu highlight Phase Preference with the cursor and press to open the Phase Preference menu REFERENCE Press and or to set the Reference to Channel A or B Press to set it POLARITY Press to set POLARITY as or and to set it Note Notation changes from B LAGS A to A LAGS B when switching REFERENCE from A to B 4 6 RANGE Press and t Jor to select the range value to either 180 or 0 to 360 degrees and to set it LEAD LAG DISPLAY Press and or to switch the Lead Lag display ON or OFF When selecting ON the words LEAD or LAG will be displayed in the Ap
16. the axes for the Integration function Channel B A ratio key divides channel B by channel A Results are in Ohms Mhos unitless and degrees Channel B current selection selects 84 Appendix A Keypad Definitions BV DATE LCD LOG B MIN MAX RCL channel B for current measurement Channel B voltage selection selects channel B for voltage measurement Date key view or adjust the date on the Real Time Clock Multi function keys soft keys currently unused LCD Display adjust key access the display configuration menu Allows control of both contrast and backlighting Log key displays auto log data based on start and stop time and date Menu key access the various 928A systems configuration screens MIN MAX key press to cycle through the four different measurement modes minimum maximum average and normal measurement mode Short term flicker displays flicker for a 10 minute average Recall Data key lists data saved in flash memory when using the key Time key view or adjust the time on the Real Time Clock Appendix A Keypad Definitions 85 Integration key press to view a progres sive plot of the signal SOURCE defined by pressing and changing the input signal defined under SOURCE Scaled by sample time upper and lower limits Graphical Harmonics displays harmon ics in graphical form 86 Appendix B CT Input Connector 928A Current
17. 005 DUE Oct 18 2005 Menus in Context To access these menus you will need to be viewing the specific function and press MENU For complete information on configuring menus in context see the next section entitled Operation ENT Enter Data Press to open a menu selction move between selections within a menu and to change to a new value Also use or CE to select an item in a menu 16 Getting Started ESC Escape Press to leave a specific menu or go back in key strokes to the previous screen For example if you are viewing the Main Menu press to leave the Main Menu and view Channel Configuration STO Store Held Value in Memory Use to 1 Write to flash memory the current measured values at Channel A and B as shown on the display Save values during configuration of functions e g a CT ratio or phase offset and moving to the next item This can be used in the same way as you would highlight lt STOre And Exit gt and press ENT When Recording Data Records are stored according to the date and time running in the internal real time clock Before measuring check the clock for the correct time in the case that it has drifted or was inadvertently changed See DATE and TIME on the next two pages for information on setting the date and real time clock When Configuring Functions When assigning values during configuration generally you will press MENU to open the confi
18. 83 BI 84 BV 84 DATE 84 f1 f6 84 Graphical Harmonics 85 Integration 54 85 LCD 84 LOG 84 MENU 84 MIN MAX 84 Pst 84 Index 95 RCL 84 TIME 84 Selecting Channel Functions 24 Splash Screen 11 T Temperature 928A operating amp storage 78 AC Power Adapter 79 TIME 84 Title Page v TRIG Triggering Setup 48 U p Down Arrow Keys 11 83 pload CT Profiles See Mlink Upload CT Profiles Jploading new firmware See Mlink Uploading new firmware SB Cable See Functional Description SB Driver See Mlink Installing USB Driver ser Interface See Functional Description GES qqaq Version Firmware See Main Menu Firmware Version VI Voltage and Current Measurement See Measuring Voltage and Current Voltage Leads See Functional Description Ww Warranty iii WAV Waveform See Measuring Waveform Website See Contact Information Weight 928A 78 96 Index AC Power Adapter 79 Wh Watt hour See Measuring Energy
19. 85 Weight 175 g 6 2 oz 81 Appendix A 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 secondary keys press and then the key with blue label above the key button Primary Keys Co 9 Numeric keys including decimal point press to enter any necessary value during configuration menus Secondary key access any of the secondary keys located above the nomenclature printed on the key itself Phase Frequency key view the phase and frequency at channels A and B Phase requires two signals and frequency only one signal frequency channel is selectible AB Channel B A ratio key divides channel A by channel B Results are in Ohms Mhos unitless and degrees ENT Enter key open a hidden menu and to install a configuration value ESC Escape key press to return to a previous screen or to leave a specific menu FLK Instantaneous Flicker view the instanta neous flicker updated once per second 82 Appendix A Keypad Definitions STO VI 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 measure ment functions Numerical Harmonics key view the harmonics of the signals at channels A and B from the 2nd to the 50th On key press to switch the 928A on and off
20. F for Channels A and B PQ Config to deactivate the PQ Event Recording Otherwise trigger records will continue to fill up the available flash memory module See PQ Event Storage and Viewing on page 44 NOTE The PQ function triggers on the RMS values of voltages and currents that exceed the specified Point Limits The RMS value must exceed the Limit for the duration specified as Dwell See the next page for configuring Point Limits MLINK Software Tutorial 69 Configure Power Quality Point Limits There are ten identically appearing Point Limit values all of which are set up in the same manner and can be placed in any order In the example below there are three separate Point Limits defined All of the Limit Functions are X gt Limit and Limit Formats are Absolute The Limits are defined in decreasing voltages as 150 135 and 130 with increasing Dwell times of 1 4 and 12 half cycles x Settings Point Limits Point Limit Function Limit Format Limit Dwell half cycles 2 u Bos Eiee oase fr o2 x gt timt 7 absoute x 135 000000 4 03 jOfF 7 Absolute fed 0 000000 0 04 X gt Limit x Absolute bod 139 000000 12 o5 joff 7 Absolute z 0 000000 0 a X Point Limit Definitions 1 Point denotes the number of the Point Limit 1 10 2 Limit Function set to OFF X lt Limit X gt Limit 3 Limit Format set to Absolute or Percent 4 Limit sets the numerical value against w
21. 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 order to measure the signal properly for example CAT Press and connect the meter probes between the 928A and the circuit under test ags 0 152A 352 Read the display 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 screen will open the next higher or lower set of harmonics To read Channel B graphical harmonics press luu Repeatedly pressing toggles between Channel A and B graphical harmonic data 42 Operation Flicker Information Flicker measurements deal with 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 basic concept behind placing limits on voltage fluctua tions is that they cause lights to flicker which can be irritating and may cause discomfort Voltage fluctuations are caused by loads on the power di
22. IM 130 000 ABS X gt LIMIT DUR Accessing PQ Events 1 Press to view power quality event records Power Quality events are listed according to Record Number RECS Date and Time PQ TRIGGER INACTIVE PQ TRIGGER ACTIVE CH A PROF 1 PNT CH A PROF 1 PNT 1 DATE Sep 20 2005 DATE Sep 20 2005 TIME 10 00 17 084277 TIME 10 00 12 893066 MIN 125 122 MIN eee MAX 134 124 MAX R REKE K REC 2 of 4 REC 1 OF 4 AVAIL RECS 24526 AVAIL RECS 24526 2 Scroll through the listed events by pressing or shows MIN MAX values when PQ Trigger is Inactive left screeb no MIN MAX values when Active right 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 Excel spreadsheet NOTE PQ profiles PROF 1 PROF 5 must be configured through Mlink software prior to uploading to the Model 928A 48 Operation 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 Viewing Triggers 1 Press to view the Trigger Events screen Press _ _ or _ _ to move through the record list TRIG 1 ACTIVE DATE May 19 2005 TIME 16 57 29 400 T
23. Log Records See Mlink Download Log Records Download Power Quality Records See Mlink Download Power Quality Records Download Trigger Records See Mlink Download Trigger Records DSP See Functional Description E email contact See Contact Information Erase Flash Utilities 15 F FAX Number See Contact Information Features 1 Firmware Version See Main Menu Firmware Version Flicker 42 Flicker Information 42 FLK Flicker instantaneous 43 Function Keys fl f6 11 Functional Description 73 H HOLD Hold Function See Hold Function Hold Function 52 HRM Harmonics graphical See Measuring Harmonics graphical HRM Numerical Harmonics See Measuring Harmonics numerical Humidity Standard CT 79 Index 91 Inlet Power Battery 5 Input Ratings Current 9 Voltage 8 Input Sections See Functional Description Integration Function 54 Restart Plot 54 Integration Key 54 85 Interference EMI Power Adapter 79 K Keyboard Operation 4 Keypad Definitions Appendix A 81 Keys Primary See Keyboard Operation Secondary See Keyboard Operation Keys secondary AI 9 L LCD 10 84 LOG key 84 Main Menu 12 Auto Shutdown 14 Firmware Version 12 Flash Utilities Menu 15 Frequency Preference 14 92 Index Menu Key 12 Phase Preference 13 Measurement Freguency 30 Phase 30 Measuring Active amp Reactive Power 32 Energy 36 Flicker 43 Freguency 30 Harmonics graphical 41 Harmonics numerical 40 P
24. MLINK Software Tutorial 65 Configure User Screens Two user screens are available for you to customize the 928A display Once configured you can toggle between the two screens by pressing f successively If your requirements change you can run Mlink again to change the order or type of functions listed in the 928A User Screens Configure User Screens x Screen 1 screen 2 Possible Fields Selected Fields To Configure User Screens 1 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 Connection To add new fields select the desired fields in the Possible Fields box and click the right arrows NOTE Each user screen allows a maximum of seven items the maximum number of lines on the 928A display To remove fields select the desired fields in the Selected Fields box and click the left arrow To change the order in the Selected Fields window select the desired field in the Selected Fields box and click either the Up or Down arrow Click OK to close the Configure window 66 Model 928A Power System Multimeter 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 48 Loo an Save in Sy Power Sentinel
25. MODEL 928A POWER SYSTEM MULTIMETER USER S MANUAL ARBITER SYSTEMS INC PASO ROBLES CALIFORNIA U S A Notice This manual is issued for reference only at the convenience of Arbiter Systems Every 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 Arbiter Systems Inc 1324 Vendels Circle Suite 121 Paso Robles CA 93446 Tel 805 237 3831 Tel 800 321 3831 Fax 805 238 5717 www arbiter com sales arbiter com techsupport arbiter com iii Warranty Arbiter Systems makes no warranty expressed or implied on any product manufactured or sold by Arbiter Systems except for the following limited warranty against defects in materials and workmanship on products manufactured by Arbiter Systems Products manufactured by Arbiter Systems are guaranteed against defective materials and workmanship under normal use and service for one year from date of shipment 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 under 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 shipment For warranty service or repair pr
26. Mlink 7 ex E History G Desktop EET Ed eo msvcr71 dll python24 dll Uninstall exe My Computer A al File name 1928 trig 2005 09 19 11 26 25 c E My Network P Save as type AI files 7 Cancel Zo To Download Trigger Records 1 Power on the 928A and connect the x USB cable between the 928A and EER the computer records WARNING Start Mlink and check for a green a connection light If red go back to Startup USB Connection 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 End message received Sa 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 MLINK Software Tutorial 67 Configure Power Quality Use this section to assist you in configuring the 928A to measure sags and swells by using CBEMA curve type Point Limits Point Limits are voltages or currents and stored in a profile The 928A can store up to five separate profiles For more information on measuring sags and swells see PQ Power Quality on pages 44 to 47 Configure Power Quality Settings i EE TEE Settings point Limits Description Arbiter Test 1 S Declaredinput 0 00000 S S Hysteresis
27. Power and Energy Quantities esse ese esse see ee ee 78 General EE tices EE RE ee Ee Ee GE Melee eas 78 Physical Ee EE Ee EE De EE ee ig 78 Erivironimental ii ESE EE ie ee EE Bn 78 AC Power Adapter iese ese see ee ee ee ee ee ee ge 79 Kit Current TransfOFmer esse ses sesse se ee ee ek ke ee 80 Specifications 20 eee eeceseseceeceseeeceeceeeeeceeteateeceeteetees 80 Electrical Characteristics 0 0 0 ceeeeeceeseeseeseeeeeneeees 80 General Characteristics cccccccccccsssssscccceeessssseseeeees 80 xii Contents Appendix A Keypad Definitions 81 Primary Key Sre sesse see se see ee ke Re ke ee ee ee ee Ge 81 Secondary Keys iis sees ees EERDER Gee ees ieee 83 Appendix B CT Input Connector 86 928A Current Input Connector 0 0 eee se ke ee 86 CT Cable Connector ese ese ee ee ee 86 Appendix C Phase Conventions 87 Introduction Welcome to Arbiter Systems new Power System Multi meter with Floating Point DSP The new 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 6 V wall adapter for continuous use The alkaline cells provide about 30 hours of use and the NiMH should provide about 60 hours of use Some of the features include e 128
28. Started 23 Low Range Mode For current measurements below 10 mArms 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 mArms run the risk of being clipped Voltage Ch B V Change the Channel B voltage configuration in the same manner as for Ch A V above Remember that these settings only apply for Channel B when selecting the voltage function Current Ch B Change the Channel B current configuration in the same manner as for Ch A I above Remember that these settings only apply for Channel B when selecting the current function Current Probe Configuration Examples For secondary side measurements you will need to set up the instrument scale factors so that you can correctly read the primary value The example below shows how to set up a specific probe values CAUTION DO NOT connect any probe if the probe output exceeds the maximum input rating of the 928A EXAMPLE Current Probe Specification AC Current Probe AC Input 75 Arms maximum AC Output 10 mA A rms 660 Vrms Working volts max This probe produces 10 mA at the output terminals to the 928A for an input current of 1 Amp 24 Getting Started MAXIMUM OUTPUT CURRENT AC Input AC Output 75A 10 mA A 750 mA or 0 75 Arms It is safe to apply a current or voltage to the Current Inputs if it is less than or
29. X64 graphic LCD display e 30 key multi function keypad e Isolated USB serial interface e 4AAcells or a6 Vdc plug in power supply e Flash memory for approximately 6500 records e Accurate internal real time clock e Mlink application software Simple Measurement To make a measurement simply set the inputs for voltage or current connect the correct set of cables and press the desired function button Record Data Store data by pressing the 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 gives ample space for storing thousands of records 2 Introduction Safety Information Read the safety information inside this manual Dangerous voltages may be present at the terminals 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 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 Connect voltage and current signals to two identical channels labeled A and B Prior to measuring make sure that the channels have been correct
30. YPE CH A MAG Limit X lt LIMIT MAX kkkkkkk REC 1 of AVAIL RECS 29646 TRIG 1 INACTIVE DATE May 19 2005 TIME 16 57 31 750 TYPE CH A MAG Limit X lt LIMIT MAX 109 689 REC 2 of AVAIL RECS 29646 In the screenshots 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 indicates a MAX or MIN value of the input signal during the time while the trigger was active In this example the Limit was set to 110 00 and the lowest value recorded during this event was 109 689 volts Operation 49 Configuring Triggers To configure individual triggering conditions of any trigger press MENU Once in this menu step through each condition and view or edit any value There are 8 individual triggers available to configure or edit TRIGGER SETUP Trigger 1 Signal INACTIVE Logic X lt LIMIT Limit 110 00 Ref 0 0 Dwell 20 lt STOre And Exit gt 1 Press and or _4_ to select trigger 2 Use t and _J_ or the number keys to the configure triggering conditions 3 Highlight lt Store And Exit gt and press to store new values 4 Press to exit the TRIG configuration screens Trigger Setup Value Definitions Trigger 8 possible profiles to compare with input s
31. a strict ratio with no displayed units for A B and degrees Operation 51 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 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 B to a current a channel A pressing the B A button will display the results of dividing the voltage by the current giving resistance and phase offset of Channel A from Channel B Setup 1 Press and connect the measurement probes to the circuit under test 2 Read the display Ch B Cha B A 0 1000 mhos Ph 9 0000 A 120 0V B 12 001 NOTES If you configure channel A as voltage and channel B as current 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 B A and degrees 52 Operation HOLD Hold Metered Value Press to freeze the 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 17 and 18 When in the hold mode you will see the word HOLD in the lower secondary line of the display as illustrated below Wh
32. and B magnitude Power Factor Q VARs Watts Relative Phase B to A Frequency Frequency Deviation Frequency Rate 10 Channel A and B Flicker MLINK Software Tutorial 59 Mlink Software Tutorial Introduction This tutorial was written to assist you in using Mlink the new software interface written specifically for the Model 928A Mlink not only gives you a simple method of moving your important data from the 928A to your computer it simpli fies configuring complicated measurement functions like Power Quality Additionally Mlink uploads the newest firmware release to the 928A giving you the latest features at no extra cost Mlink Advantages Since the 928A was developed as a portable instrument most of the features are accessible from the front panel However more complex features are only accessible by using Mlink software and these include e Uploading CT Profiles probe characterization e Configuring Power Quality amp Downloading Records e Downloading Auto Logged amp Triggered Records e Configuring Custom User Screens e Uploading New 928A Firmware Download Mlink The latest version of Mlink is available by contacting Arbiter Systems at the information listed on page ii of this manual or by downloading from the web site at http www arbiter com software downloads php 60 Model 928A Power System Multimeter Installing USB Driver Before using Mlink you will need to load USB Virtual COM Por
33. and say Download Complete or will say Nothing to Download if there are no records to download 72 Model 928A Power System Multimeter 6 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 immediate progress Uploading New Firmware Mlink provides an easy method for uploading firmware to the 928A and optimizing performance When new firmware versions become available they may be obtained by downloading from the web site at http www arbiter com software downloads php or by contacting Arbiter Systems technical support 1 Once you have obtained a new version of 928A firmware you can upload it to the 928A by using Mlink and selecting Main gt Upload Firmware or by holding the Alt key and pressing U The firmware file is normally in a zip format e g 928A Upload zip 2 Select the file and click OPEN and you should see the progress as shown in the window below Click OK when finished Uploading Firmware E x All done a zi Wrote 317 317 OK Functional Description 73 Functional Description The Model 928A is a two channel AC power measurement instrument providing 0 1 accuracy in a handheld pack age Besides voltage current and power quantities it measures power quality including harmonics flicker sags surges and interruptions Also it includes a graphical
34. 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 inputs and the 4052 switches the source for current channels either a current CT maximum input 1 2 Arms voltage CT maxi mum input of 1 2 Vrms or gain of 20 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 processing reducing the parts count and power requirement 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 Accessories Arbiter Systems recommends the use of the following accessories for use with the Model 928A Current Measurement CT Leadset AS0027100 AS0027200 current voltage output This accessory current leadset connects directly between a Model AP0009800 CT using safety banana connectors and the Model 928A current terminals It is constructed of high quality silicone insulated fine stranded wire for durability and safety Standard CT AP0009800 100 1 clampon CT LEM M3 100A 100 Arms 10 mA A standard banana connectors Functional Description 75 Optional CT Model 09113A clampon CT AEMC SR601 1000 1 1000 Arms 660 Vrms 1 mA A shrouded banana connectors Requires CT ca
35. ave the Recall Stored Values list 54 Operation Integration Key Purpose Use the Integration key to view a plot of the selected signal over time Signals include voltage current freguency phase and power factor The signal sampling interval can be configured in seconds from 1 to 65535 For better viewing configure upper and lower limits of plotted input signal The vertical range scales according to the upper and lower limits that you configure Press 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 Press to plot and view the configured signal 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 the previously plotted frequency moves to the left Operation 55 AXIS Key Use the AXIS key to configure how the Integration function plots the signal source There are five categories 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 Signal Channel A or B freq phase PF Actpwr Int
36. ble assembly CA0027100 Voltage Measurement For voltage measurement use the AP0009700 voltage leadset This leadset includes Arbiter s professional leadset 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 clampon CTs leadsets and manual USB Data Cable Use CA0026106 USB cable when configuring the Model 928A or downloading data from the flash memory module with Mlink software 76 Specifications Specifications Input Input Configuration The Arbiter Systems Model 928A Power System Multim eter has two identical measurement channels Channel A and Channel B Each input channel has a voltage input and a current input Current inputs are intended for use with external CTs having a nominal output of 0 1 Arms or 0 1 Vrms For basic measurements voltage current frequency phase angle any combination of inputs may be used For power and energy measurements active power apparent power reactive power and power factor one voltage and one current must be selected Voltage Input Range 0 to 660 Vrms Impedance 1 2 megohm differential Current Input Range 0 01 to 1 Arms underrange to lt 1mA Burden 0 01 ohm max gt 10 Mohms Interface Operator Interface Display 128X64 graphic LCD Keyboard 30 key keyboard Serial USB
37. ct whether you want the 928A to automatically shutdown or not If you do want it to automatically shut down to conserve batteries then the configuration panel allows you to select a number of different time intervals in which the 928A will automatically power down See Auto Shutdown on page 14 Battery Power Only The Model 928A operates on four AA alkaline or Nickel Metal Hydride batteries Therefore in the event of a battery failure always carry a spare set of fully charged batteries Caution To optimize reliability and reduce the possibility of corrosion between the contacts keep all terminals as clean as possible One method of cleaning the 928A and 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 AP0009400 that provides power to the 928A and is suitable for continuous use The power adapter is not designed to charge any batteries located in the battery compartment For power adapter details and specifications see AC Power Adapter on page 79 6 Getting Started Caution The AC power adapter does not charge internal batteries Batteries are disconnected when power adapter is connected to the Model 928A Operation The power adapter supplies power to the 928A for normal operation While using the power adapter any batteries installed in the 928A are disconnected T
38. e OK button A short delay may occur for the OK button to become available 2 Ifthe 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 serial number should appear e g PSM 00001109 detected 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 5 Restart Mlink and check for your COM port as per steps 1 3 above MLINK Software Tutorial 63 Mlink Main Window Located on the main screen are six basic function buttons useful for configuring and downloading records from the 928A to your pc 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 connection status When finished close Mlink by clicking the Exit button Menu MLink Copyright C 2005 Arbiter Systems Inc ioj x Main Load CT i Configure Profiles Power Quality Configure Download User Screens Log Records Download Power Quality Records Download Trigger Records Connection Light green connected red not connected Available Functions e Load CT Profiles e Configure User Screens e Download Trigge
39. e ee 28 VI Voltage and Current Measurement 004 28 F Phase Frequency Measurement 000 30 Phas Preferentes nassar 30 Phase Convention iese ese se se ek Ge ee Re Ge ke ee 31 PWR Active and Reactive POWET s e 32 PF Power Factor amp Apparent Power s s s 34 Lead Lag Display ersinnen sinsi 35 Wh Watt hour ees se ee ke Ge Ge Re Ge Ge Re GR Ge ke ee 36 WAV Waveform iss Ese Rees EER ee Ep ee gegee GER EE aids 38 HRM Numerical Harmonics i iese sesse esse esse ee ee 40 Graphical Harmonics ees see ee ee ee ee 41 Flicker Information ees see ae se ee Re ee Re Re Ee 42 FLK Instantaneous Flicker iese sesse see ee ee 43 Pst Short Term Flicker iese ese see ea ee Re Re 43 PQ Power Quality Sags and Swells 0 6 44 ER acid Hedin inert nile 44 PO Profiles EE EE EE 44 USER Profil iss ies Ee SEE Ee ese GES Se EG 44 Profiles de AE N N 44 PO El MR N EE N 45 Example CBEMA Curve ees esse esse ees ee see eke ee 45 Working with PQ Profiles and Records 46 Selecting PQ Profiles oie se ke ee ke Re ke 46 Accessing PQ Event e sesse ese ese ese ese ese gee ske ee ee iis 47 TRIG Working with Triggers iese sesse ee ee 48 Viewing Triggers iese RR RA Re ee 48 Configuring Triggers iese see see ee ee ee ee ee ke 49 A B PUGH OM sisi ioe ke ee Re eine ee eg ge Ee eels 50 BA Bun CHO sesse ER es Ese ee ee iese Ges GP ER aiin 51 HOLD Hold M
40. ee ee 14 Flash Utilities MENU sees se se ee ee ee 15 Calibration Date Info oe see ee ee Re Ge Ge ee 15 Menus in Context sesse see se ke ke GR Re Re ee 15 ENT Enter Data sssr iese EE Ek Ee EER se Se ee ee 15 ESC EsCape EE Nestenie 16 STO Store Held Value in Memory cesses 16 When Recording Data eee sesse se see ee ee ee 16 When Configuring Functions esse sesse ese ee ee se 16 TIME ii EE tires ce GE Re EA 17 Viewing the Time ce sesse se ek ke Re Re Re Re ee 17 Adjusting the Time ees see ee ee ee ee ee 17 DATE weiran ee ee ee ee ey ek ie RE Ee ee 18 Viewing the Date sesse se sk ke Re Re Re Re ee 18 Adjusting the Date oo cee see see ee ee ee ee ee 18 Using the Input Channels A and B ote se see ee ee 19 Configuring Channels A and B ossee 20 Voltage Ch A Vo ese ese ee ee ee Ge SR Ge Ge ee 20 Input Rati este sesse DERDE bg GESE E kes dee r pinaes 21 Phase Offset wcscsce cescsteatiey eg SE Ge se Ese EG GO 21 ide ER N 22 GT Select ss EES ENGER clients 22 Low Range Mode see se eke ee ee Re ee Re ee 23 Voltage CH B V osse sees ee We Gee oe RE Se Ee ee DEE Ke 23 Current AO EE N 23 Current Probe Configuration Examples 0 23 Selecting a Channel Function esse see see sees 24 Measuring Voltage and Current sesse sesse see ee ee 24 Using the M3 Current Probe s e 25 Contents ix Operation iss Ee EE ese SR be ee Gee dd See 27 Making Measurement esse sesse see ee Ge ke GR k
41. el A 60 88 Index A A B Function 50 AC Power Adapter 79 See also Power AC Power Adapter p n AP0009400 See Appendix B Accessories 74 ADC analog to digital converter 74 See also Functional Description Address See Contact Information AT 83 Appendixes A Keypad Definitions 81 B AC Power Adapter 79 C CT Input Connector 86 D Clamp on CT 80 E Phase Conventions 87 Arrow Keys See Up Down Arrow Keys Auto Shutdown 5 AV 83 AXIS key 54 55 83 B B A 81 83 B A Function 51 Battery 5 77 Battery Replacement 6 BI 84 BV 84 C Case Instrument 3 Index 89 Case Soft Carrying 75 See also Functional Description Configure Point Limits See Mlink Configure PQ Point Limits Configure Power Quality See Mlink Configure Power Quality Configure User Screens See Mlink Configure User Screens Configuring Auto Shutdown 14 Ch A for Current 22 Input Ratio 22 Phase Offset 21 Ch A for Voltage 20 Input Ratio 21 Phase Offset 21 Channel B for Current 23 Channel B for Voltage 23 Channels A and B 20 Configuring Channels 20 Connecting 928A to PC See Mlink connecting Contact Information ii CT Current Probe Setup 23 Examples 23 CT Current Measurement See Functional Description CT Accessory probe Using 25 CT Characterization Service 3 CT Input Connector See Appendix C Custom User Screens 11 D DATE 84 DC Battery Operation 5 90 Index Display Type 3 Document number See Title Page Download
42. en not in hold mode the word HOLD will disappear AV 60 000 Hz 123 45 Secondary Lines 1 2345 B I HOLD 38 59 Procedure 1 Set up the 928A to measure the values you wish to observe If necessary see Configuring Channels A and B on page 20ff 2 Connect the measurement probes between the 928A and the circuit under test and press HOLD This puts the display in the hold mode 3 Read the values 4 To return to the measurement mode press HOLD again Operation 53 RCL Recall Stored Values STO Use the RCL function to open the list of eight records stored from using the STO key Records are replaced when storing a new record over the old record location The Model 928A can store up to eight records with the key Records are identified by number from 1 to 8 Records are stored according to number type date and time as shown in the example below Viewing Procedure Selected _ OAAR ORE RAT 01 25 04 08 02 12 04 12 02 24 04 14 03 01 04 23 03 04 04 01 03 05 04 04 03 08 04 09 1 Press to view the Recall Stored Data screen 2 Use _ t Jor _J_ to select the record for viewing 3 Press to view the selected record in the same data viewing mode as saved Note REC1 for Record 1 in the lower right of the display Apparent Power VA 129 06 0 8765 Power Factor REC1 4 Press to return to the Recall Data screen and select a new record Press again to le
43. erval From 1 to 65535 in seconds Graph Type Scroll or Fixed Axis Max Maximum plotted value on display Axis Min Minimum plotted value on display Procedure 1 Press to open the Integration Key configuration screen 2 Press or _ _ to locate the desired field and to enter the variable field 3 Press eat C or number keypad to change the required values s and press to move to other fields 4 Finally highlight lt STOre And Exit gt with the cursor and press to save any changes and exit this menu 5 Press at any time to quit the menu function 56 Operation LOG Key Purpose Use the LOG key to automatically record basic electrical 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 Records Basic Data only see list at end of section e Logging interval is measured in seconds e Stores up to 6592 records maximum Viewing Autolog Information To view Autolog information press and the screen will display some basic information about the data logging features AUTOLOG INFO AVAIL RECORDS 6592 SAVED RECORDS 0 STATUS INACTIVE In order to operate the Autolog function needs start and stop times and dates a logging interval in seconds and stop mode Set up these features in the Autolog Setup menu Note Viewing Autolog Data Use Mli
44. etered Value 0 see sesse ee ese ee 52 RCL Recall Stored Values STO eie sees see 53 Integration KEWER RE ested ee tetas es Se Geen 54 AXIS K RE EEN 55 x Contents Graph Definitions 00 0 ee see ee ee ee ee ee ee ee 55 LOGT SE EE N 56 Basic Data List sesse EERS es SEGE SS ee EE See Eend 58 Mlink Software Tutorial sees esse Ese RE EE 59 Hit OCU CHOI esse ee cds eu Se edna ER SR Koeke ED ED Ge ee 59 Mlink Advantages esse sesse se ee ke Re Re Re ee ee 59 Download Minko esse sesse sees see ee Ge ee Re ee ee 59 Installing USB Driver sesse see see see ee ee ee Re ee 60 FTDI Driver on Windows XP ooo essences 60 Installing Mlink 20 eee ee ee Re Ge Ge GR GR Re Re ee 61 Connecting the 928A to a Computer eee sesse ese 61 Startup USB Connection ee ee 62 Conmecting iese RA Re AR AR Re AR 62 Mlink Main Window esse see see se see se ke Re ee ee ee ee 63 Available Functions esse see see see see ske ee ke ke Re ke ee 63 Upload CT Profiles ee ee RA RR Re G 64 To Install Profiles ese see see se se Ge ke Re Ge ke Re ee 64 To Erase Profiles inserirse 64 Configure User Screens ees ese see ee ke ke GR ee Re ee 65 To Configure User Screens seee 65 Download Trigger Records n 66 To Download Trigger Records esse see se ees 66 Configure Power Quality sesse ese see see ee ee ee Ge ee ke 67 Configure Power Quality Settings eee 67 Us t Profle ii ER AE sia siseeieaes 68 OFF
45. ghlight lt STOre And Exit gt and press to install any new values and return to the Channel Configuration menu Press to leave the Channel Configuration menu and return to the measurement mode 22 Getting Started Current Ch Al Current Configuration includes five items CT Select Input Type Input Ratio Phase Offset and Low Range Mode 1 Open the Channel A current configuration screen See Configuring Channel A and B from previous page Ch A CURRENT CONFIG CT SELECT USER INPUT TYPE INPUT RATIO 4 PHASE OFFSET 0 0 LOW RANGE MODE OFF lt STOre And Exit gt 2 Use or 4 and the numeric keys to enter the Input Type Input Ratio Phase Offset and Low Range Mode values as required CT Select Selects either USER or M where M HHHHHH the Arbiter calibrated CT serial number e USER selects one user calibration constant MAAR selects a 12 point characterization set for the specified clamp on CT provided by Arbiter Systems Calibration constants are installed in the 928A using Mlink software and obtained from Arbiter Systems See Mlink Software Tutorial for uploading CT Characterization files 3 If choosing a CT SELECT value of MAAR you cannot change Input Type Input Ratio or Phase Offset 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 to exit this menu Getting
46. guration screen for a specific function After changing the required values in each field you can press to install the new value s in memory and leave that menu Use in the same manner as you would with lt STOre And Exit gt Getting Started 17 TIME Viewing the Time Press to view the time 23 59 59 Adjusting the Time 1 While viewing the time press MENU to access the time adjust screen SET TIME HOUR 23 MINUTE 59 SECOND 59 FORMAT 24 Hr lt STOre And Exit gt Press _ _ or to move between fields and to highlight desired value you want to change Press ENT and C or number keys to adjust the desired time value and to move to the next value When finished highlight lt STOre And Exit gt and press to install new values and return to viewing the time Press Esc to leave viewing the time screen g 18 Getting Started DATE Viewing the Date Press to view the date Jan 01 2004 Adjusting the Date 1 While viewing the date press MENU to access the date adjust screen SET DATE MONTH Jan DAY 01 YEAR 2004 FORMAT MMM DD YYYY lt STOre And Exit gt 2 Press _t_ or _ _ to move between fields and to highlight desired value you want to change 3 Press _t_ _4_ or number keys to adjust the desired date value and to move to the next value 4 When finished highlight lt STOre And Exit gt and press to install new values and return to view
47. hase 30 Power Factor amp Apparent Power 34 Power Quality 44 Voltage amp Current 28 Waveform 38 MENU 84 MENU Key See Main Menu MENU Key MIN MAX Key 10 84 Mlink Configure Power Quality 67 Configure PQ Point Limits 69 Configure User Screens 65 Connecting 61 Download Log Records 70 Download Mlink 59 Download Power Quality Records 71 Download Trigger Records 66 Installing 61 Installing USB Driver 60 Linux version 60 Main window 63 Tutorial 59 Upload CT Profiles 64 Uploading New Firmware 72 Index 93 MTBF AC Power Adapter 79 MUX See Functional Description O F Phase Frequency Measurement See Measuring Phase and Frequency ON and OFF 5 P PF Power Factor amp Apparent Power See Measuring Power Factor amp Apparent Power Phase Conventions 31 Preferences 30 Phase Preference See Main Menu Phase Preference Phone Number Arbiter See Contact Information Power AC Power Adapter 5 79 DC battery operation 5 Power Supplies See Functional Description PQ Power Quality See Measuring Power Quality Primary Keys 2nd 81 cursor control 83 ENT 81 ESC 81 FLK 81 HOLD 82 HRM 82 numeric 81 F 81 ON 82 PF 82 94 Index PQ 82 PWR 82 STO 82 VI 82 WAV 83 Wh 83 Pst Short Term Flicker 43 PWR Active amp Reactive See Measuring Active amp Reactive Power R Ratio Function A B 50 B A 51 RCL 53 84 S Safety Information 2 Secondary Keys AI 83 AV 83 AXIS 54 55 83 B A 83 Backspace
48. hich the measured signal is compared a floating point value 5 Dwell during trigger condition sets the number of input signal half cycles that must occur before recording begins an integer number 6 Click OK to install PQ Profiles in the 928A or Cancel to quit without making any changes 70 Model 928A Power System Multimeter Download Log Records The 928A is designed to transfer AutoLogged records to your pc using the LOG key To configure Autologging see LOG Key on pages 56 to 58 Records stored using the function are not available for download using Mlink software but only for viewing from the 928A 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 a start and stop time and date In order to use this feature effectively make sure to set the correct time and date See TIME and DATE on page 17 and 18 MA 22 Save in fa Power Sentinel Mlink J ex Uninstal exe 928 log 2005 09 19 14 44 13 csv s 928 trig 2005 09 08 15 07 05 csv A N arbiter ico 2 a rend j mink exe log gt python24 dil My Computer File name 928 log 2005 09 22 11 40 47 csv Save My Network P Ls Save astype AN files X Cancel Downloading 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
49. ibilities exist Ch AV Channel A measuring a voltage Ch AT Channel A measuring a current Ch BV Channel B measuring a voltage B DE Ch BI 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 to open the measurement mode AV 60 000 Hz 123 45 1 2345 8 59 2 Press 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 Ct or TB to highlight the channel and to open the specific Channel configuration screen In this example Ch A V sets the voltage measurement parameters for Channel A Getting Started 21 You should see the display change to the ChA VOLTAGE CONFIG screen as shown below The configured items for voltage are Input Ratio and Phase Offset Ch A VOLTAGE CONFIG INPUT RATIO 1 00 PHASE OFFSET 0 0 lt sTOre And Exit gt Press or _ _ to select desired field and to select value to change Input Ratio 6 Enter the ratio values from the numeric keypad and press to move to the next field Note that all ratios are referenced to 1 For the example screen above the Input Ratio is actually 1 1 Phase Offset 7 Enter the Phase Offset value from the numeric keypad and press to move to the next field In this example the phase offset is 0 0 When finished configuring the channel hi
50. ignals Signal Allowable input signal values INACTIVE means trigger is not armed CH A MAG CH B MAG WATTS VA VAR PF Logic Four conditions available 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 compare to Limit floating point Dwell The persistence in alarm condition before trigger becomes active in 50 millisecond increments e g 20 1 second an integer 50 Operation A B Function Use the A B 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 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 properly 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 20 2 Press and connect the measurement probes to the circuit under test 3 Read the display Ch A ChB a B 10 000 oms rm 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
51. ing the date 5 Press to leave viewing the date screen Getting Started 19 Using the Input Channels A and B This page describes four steps in setting up and using the two input 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 measure 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 channel 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 Select the Channel In this step you determine what each channel is measuring Let s say you want to measure voltage on Channel A and current on Channel B To set this up press to set Channel A to voltage press to set Channel B to current If you want to set up both channels to measure current then press to set Channel A to current press to set Channel B to current Note You must press the appropriate channel selection keys to correctly measure the desired function 3 Choose the Measurement Mode For example press to display voltage and or current values Connect the Equipment To measure connect the leads between the 928A and the circuit under test 20 Getting Started Configuring Channels A and B Configure Channels A and B for both current and voltage through this menu Four poss
52. l A to measure voltage 3 Connect the probe s between the 928A and the circuit under test 4 Press and read the channel A graph on the display A 120 75 V Channel A Voy 5 Press again to view the channel B graph on the display 6 Press a third time for a combined view of channels A and B on the display Channel B Combined 1 2512 A 120 75 Vv 1 2512 A Operation 39 40 Operation HRM Numerical Harmonics To view or record signal 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 voltages 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 the correct signals for Channels A and B for example to measure voltage on channel A 2 Press and connect the meter probes between the 928A and the circuit under test 3 Read the display In this example the display indicates channel A voltage in volts and phase angle in degrees 564 010 459 247 934 094 137 4 Press or G to view the full range of tabulated harmonic values from the 2 to the 50 Pressing the arrow keys moves through the individual harmonic numbers and levels in groups of seven 5 To read Channel B numerical harmonics press HRM Repeated pressing toggles between Channel A and B numerical harmonic data Operation 41 Graphical
53. ly configured for the signal type whether they are voltage or current Caution No Direct Current Input Do not connect a current signal directly to either Channel A or B Always use a current output or voltage output CT when measuring current with the 928A Measuring Safety Be sure to follow all precautions and safety information provided with any other equipment you are using Introduction 3 The Instrument Case Made from strong copolymer similar to nylon the 928A case is designed to protect it from certain mechanical and electrical hazards however it is not waterproof 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 Display Using a 128x64 pixel display the 928A can display all text and graphics necessary for operation The LCD can be adjusted for contrast and backlighted operation CT Characterization Service While the 928A kit includes a CT probe that has been characterized for accuracy Arbiter provides a service for users to have their own CT s characterized for use with the 928A After characterizing receive a file for use with the 928A Contact Arbiter Systems for more information 4 Getting Started Keyboard Operation Most of the key
54. nd B allow you to connect either a voltage output CT or current output CT to the 928A A CT configu ration screen allows you to setup CT values for both channels ahead of time so they are ready to go at the job site CURRENT INPUTS oo 0 1 2 Arms oe a 0 1 2 Vrms 4 ZN CT OUTPUT ONLY CHANNEL A CHANNEL B CT configuration includes entering the CT Output Type either voltage or current CT Ratio and Phase Offset To set up Channel A to measure current press a To set up Channel B to measure current press Br 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 See CT SELECT under Configuring Channels A and B on page 20 11 Caution No Direct Current Input Do not connect a current signal directly to either Channel A or B Always use a current output or voltage output CT probe when measuring current with the 928A 12 10 Getting Started Caution Max CT Input Level Never apply any signal to Channel A or B current input terminals which is greater than 1 2 Arms or 1 2 Vrms 928A Keys MIN MAX Key Press the MIN MAX key to cycle through various measure ments including the minimum maximum average and normal active To reset press and hold the backspace key for 3 seconds while in MIN MAX function LCD Display Cont
55. nk software to download Autolog records to computer and view in spreadsheet format They cannot be viewed on the 928A itself Operation 57 Autolog Setup 1 From the Autolog Info screen press MENU The Autolog Setup screen should appear AUTOLOG SETUP Start D Feb 09 2005 08 10 00 Feb 09 2005 00 00 16 5 sec lt STOre And Exit gt Use the arrow keys to locate the field you wish to alter and press 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 SET LOG START DATE MONTH Feb DAY YEAR 2005 lt STOre And Exit gt SET LOG START TIME HOUR 8 MINUTE 10 SECOND 0 MODE 24 HR lt STOre And Exit gt Adjustment procedure Use the arrow keys to locate the desired field value and press to enter the value Use the numeric keypad to enter the desired parameters and press to store When you have finished adjusting any parameters always move the cursor to lt STOre And Exit gt and press 58 Operation When finished adjusting the 928A clock features or to quit for any reason press 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 17 and 18 Basic Data List CON AAR WN Channel A
56. o operate the 928A with the accessory power supply 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 miniplug into the 928A power receptacle 3 Press to operate the 928A Battery Replacement 1 Ifthe 928A is powered on press to turn OFF the 928A prior to removing the batteries 2 Remove the battery cover retaining screw and remove the cover by pulling it upwards at the screw side 3 Replace the batteries Note that battery orientation is indicated by symbols for polarity 4 Replace the battery cover and retaining screw and put back into service Getting Started 7 Measurement Terminals The Model 928A has two identical sets of measurement terminals called Channel A and Channel B that accept either a voltage or a current To measure a current select one of the current input connectors at the top of the instru ment To measure a voltage select a set of voltage terminals found below the current input connectors CURRENT INPUTS 2 0 1 2 Arms oe o 0 1 2 Vrms o ZN CT OUTPUT ONLY CHANNEL A CHANNEL B fr ir 660 Vrms 660 Vrms Caution Connect only current probes having an output of 0 to 1 2 Arms or 0 to 1 2 Vrms maximum to Current Inputs 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 p
57. oducts shall be returned to a service facility designated by Arbiter Systems Buyer shall prepay all shipping charges to Arbiter 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 iv Warranty This limited warranty does not extend to any product that has been subject to I Improper use or application abuse or operation beyond its rated capacity or contrary to the instructions in the user and maintenance manuals if any II Accident III Repair or maintenance performed by Buyer except in accordance with the operation and maintenance manuals if any and any special instructions of Arbiter Systems IV Modification without the prior written authorization of Arbiter Systems whether by the substitution of non approved parts or otherwise The remedies provided herein are Buyer s sole and exclusive remedies In no event shall Arbiter Systems be liable for direct indirect incidental or consequential damages including loss of pr
58. ofits 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 instrument model number and serial number and giving full details of the difficulty Service data or instrument return authorization will be provided upon receipt of this information 2 If instrument return is authorized forward prepaid to the manufacturer If it is determined that the instrument is not covered by this warranty an estimate will be made before the repair work begins if requested See contact information on page ii Model 928A Power System Multimeter Operation Manual i Warranty Table of Contents Introduction Getting Started e Operation USB Communication Functional Description e Specifications Appendixes Index Copyright Arbiter Systems Incorporated November 1 2005 All rights reserved International copyright secured Printed in USA PD0030900C vi vii Table of Contents IntroduEHOR se EER ES DEE WE EE 1 Simple Measurement esse see see see se ke ee ke Re Re ee ee ee l Record Data SEE Bh ere hee 1 Safety Information sesse se ee se Ge Ge ee Re Ge ke Re Ge 2 Caution Max CT Input Level esse ses se se ke ee 2 Caution No Direct Current Input 0 eee 2 Measuring Safety iese ese ee eke ee ee ee Ge Ge ke ee 2 The Instrument Case ee ee Re RA RA Re 3 Caution Water Damage
59. orking 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 pressing Pa Changing the PQ profile will not disturb records already stored in flash memory NOTE Make sure to download event records using Mlink software prior to deleting from flash in the 928A Selecting PQ Profiles Except for one PQ profile named USER all PQ Profiles are configured by using Mlink software Configure the profile named USER only from the 928A keyboard Addtionally Channels A and Channel B may be configured independently 1 To select a PQ Profile press gt gt MENU With the cursor highlight either Channel A or B and press to open the profile selection screen seen in right screenshot POWER QUALITY CONFIG Ch A PQ CONFIG PQ PROFILE PROF 1 Arbiter Test 1 VIEW POINTS lt STOre And Exit gt There will be 7 available choices 5 PQ Profiles 1 USER Profile and OFF to disable 2 Press to highlight the profile name e g PROF 1 and or 4 to select the desired PQ profile name Press to assign the profile name and to move to VIEW POINTS Operation 47 3 Press with cursor on VIEW POINTS to open the Point Limit viewing screen Press or 4 J to view each Point Limit Press to exit PQ PROFILE 1 CHAN A V Arbiter Test 1 REF 0 000 ABS HYS 5 000 ABS POINT 1 of 10 L
60. ower or power factor use a combination of voltage and current inputs LINE sai HEB68 HARBB maaaaa Floating Point DSP LOAD 8 Getting Started Voltage Terminals 660 Vrms max Two sets of voltage terminals allow you to directly connect voltages 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 CHANNEL B CHANNEL A CHANNEL B MIK AA MAX MAX Normally a direct connection e g 1 1 is the default selection for measuring voltages however you can configure almost any voltage ratio for PT measurement at the secondary To configure voltage ratios other than 1 1 see Configuring Channels A and B later in this section To set up Channel A to measure voltage press 2nd AV To set up Channel B to measure voltage press BV Note Voltage inputs are isolated by 1 2 Megohms to each other and have a maximum input rating of 660 Vrms Sa u0d Buneord BESKED Caution Max Voltage Input Level Never apply any signal to Channel A or B voltage input terminals which is greater than 660 Vrms Getting Started 9 Current Terminals 1 2 Arms 1 2 Vrms max Two sets of current terminals allow you to connect two current transformers to the 928A so you can measure two currents simultaneously The Current Input terminals for Channels A a
61. parent Power Power Factor function Highlight lt STOre And Exit gt and press to install values 14 Getting Started Frequency Preference FREQ PREF SELECTION REFERENCE A SETTING 60Hz lt STOre And Exit gt 1 From the Main Menu highlight Frequency Preference and press to open 2 REFERENCE Press and o to access and change Reference value 3 Press and _ _ or to access and change Frequency SETTING to either 50Hz or 60Hz 3 Highlight lt STOre And Exit gt with the cursor and press to install the new value s Auto Shutdown AUTO SHUTDOWN Time Interval 5min lt SAVE AND EXIT gt 1 From the Main Menu highlight Auto Shutdown and press to open 2 Press and _ _ or to adjust the Auto Shutdown feature OFF or to one of the predetermined time intervals 3 Highlight lt STOre And Exit gt with the cursor and press install the new setting Getting Started 15 Flash Utilities Menu FLASH UTILITIES MENU Full Mode Stop Full Erase Flash No lt STOre And Exit gt Use the Flash Utilities Menu to manage flash memory in the 928A In Full Mode choose whether or not to overwrite stored values held in memory or to stop writing Erase Flash Allows you to delete all values held in flash Calibration Date Info If your unit has a certification of calibration highlight this selection and press to view the calibration informa tion CALIBRATION INFO CAL Oct 18 2
62. r Records e Configure Power Quality e Download Log Records e Download Power Quality Records 64 Model 928A Power System Multimeter Upload CT Profiles Improve the accuracy of the 928A by installing character ization files for the specific CT probes you use In Mlink software this characterization file is called a Profile This allows the 928A to store 5 separate profiles for different probes or different characterizations for the same probe To Install Profiles 1 Power on the 928A and connect the USB cable between the 928A and the computer pa dier 2 Start Mlink and check for a a green connection light Ifred M0000040 go back to Startup USB Profile for Current Connection Nominal Ratio 100 000000 Eror Error Phase Point Calibration py las 3 From the main screen click the Load CT Profiles button 4 Select the Profile number that you wish to install e g Profile 1 this includes any of the five filenames 5 Click the Load Profiles button to view the various profiles Select the file and click OPEN Profile data should immediately appear in the Load CT Profiles window To Erase Profiles 1 Select one profile number you wish to erase e g Profile 1 Profile 5 and click the Erase button The profile data will be erased and replaced with zeros 2 Click OK to close the CT Profile window NOTE To apply profiles in the 928A see Current Ch AI on page 22
63. ra we meer STE AABBRBA HABAE OOOOOO Floating Point DSP LOAD Note in this figure voltage probes are connected to Channel A and CT connected to Channel B 2 Press and connect the probes between the 928A and the circuit elements 3 Read the display Operation 35 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 13 under Phase Preference The screen below shows a lagging power factor with the Lead Lag indication turned ON Apparent Power VA 129 06 0 8765 Power Factor LAG 36 Operation Wh Watt hour Use this mode to view the energy received and delivered To view or record any of the 10 energy values measured in the Model 928A you must select one of the measurement channels for voltage and the other for current It does not matter which channel you select for voltage or current In this example however Channel A is selected as voltage and Channel B as current Setup 1 Check to see if the internal clock is displaying the correct date and time If necessary Date and Time under Getting Started on pages 17 and 18 2 Press to configure Channel A for voltage Press to configure Channel B for current 3 Connect the test probes be
64. rol Key LCD CONFIGURATION CONTRAST BACKLIGHT OFF Ha Press to open the display configuration screen N Press or _ _ Jto select LCD contrast or Backlight control U Press to select contrast slider bar or backlight condition Press or _ _ to adjust contrast or select backlight ON or OFF and press ENT amp a Highlight lt STOre And Exit gt with the cursor and press to install new values and exit Getting Started 11 Function Keys f1 f6 f1 Custom User Screen Press 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 measurement functions through Mlink software for more information see Mlink Software Tutorial starting on page 59 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 There are currently no functions assigned to the secondary keys labeled f2 through f6 Splash Screen A ARBITER ea SYSTEMS 928A Power System Multimeter When first powered on the 928A will display an introduc tory message that describes the 928A Press any of the main measurement keys e g to bypass the splash screen Up and Down Arrows Use _t_ or _4_J to step through values in configuration menus or for choosing specific records held in memory 12 Getting Started MENU Key Use the MENU key to
65. s 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 Cv The secondary functions are indicated above the key for example above the HOLD key Primary Function Keys Primary keys need only to be pressed to function For example press to set the multimeter mode to read voltage or current for Channel A and B See Appendix A for a complete listing and definitions of these keys Secondary Function Keys To access the secondary functions first press followed by any key with symbol marked in blue above it Navigating Menus to Configure 1 To select a configure mode press the desired function then 2nd MENU For example MENU or menu 3 Scroll through fields using or and press to move the cursor to the value field 4 Press te ER or numerical keys to change these values press to install and move to another value 5 To save changes and exit highlight lt STOre And Exit gt and press ENT Alternatively press sTo Getting Started 5 Power On and Off Press to power the 928A ON and OFF To conserve power the multimeter can be configured to automatically turn itself off after an adjustable period of inactivity If you need help supplying inlet power whether connecting the power source or installing batteries see next page Auto Power Shutdown The 928A auto shutdown feature allows you to sele
66. se the AP0009400 AC Power Adapter It provides 6 Vdc at up to 800 mA to the 928A INPUT VOLTAGE 90 Vac to 264 Vac INPUT CURRENT lt 0 5 Arms at 90 Vac Input INPUT FREQUENCY 47 to 63 Hz OUTPUT VOLTAGE CURRENT 6 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 TEMPERATURE 0 to 70 C STORAGE TEMPERATURE 40 to 80 C HUMIDITY 0 to 90 Relative Humidity WEIGHT 90 g MAX 80 Specifications Kit Current Transformer Part no AP0009800 For up to 120 amps use the M3 100 1 socket output current probe with the Model 928A Power System Multimeter Using the latest transformer technology the M3 100 A 1 A socket output can measure currents from 0 1A to 120A over a frequency range of 40 Hz to 10 kHz Specifications Electrical Characteristics Current Range 100 Arms Measuring Range 0 1 to 120 Arms Output Sensitivity 10 mA A Load Impedance lt 10 Ohms Conductor Position Sensitivity lt 0 5 50 60 Hz Error due to adjacent conductor lt 15 mA A 50 Hz Phase Shift at 2 kHz 10 A degree Frequency Range 40 Hz to 10 kHz Temperature Coefficient 0 015 C Working Voltage 600 V ACrms or DC General Characteristics Maximum Conductor Size 15 mm diameter Output Connection 4 mm safety sockets Operating Temperature Range 10 to 55 C Storage Temperature Range 20 to 70 C Operating Humidity 15 to
67. stribution system which are located near lighting equipment within the same building or powered by the same distribution 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 Apparently 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 visual sensation 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 Long Term Flicker Indicator Plt The flicker severity evaluated over a long period over 2 hours using succes Operation 43 sive Pst values The Plt threshold is 0 8 Pit is not measured by the 928A FLK Instantaneous Flicker Flicker is defined as the instantaneous flicker that is updated each second By simply pressing the 928A will display instantaneous flicker based on the signals applied to channel A and B The displa
68. t drivers on your pc USB drivers for Windows are available to you by contacting Arbiter Systems or by downloading from the web site at http www arbiter com software downloads php After you have acquired the drivers you should load them on your system FTDI Driver on Windows XP 1 Unzip the downloaded file to a directory 2 Connect the 928A to your computer via the included 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 indicates that it is searching for a driver 4 Atthe conclusion the Windows new driver installation window should allow you to choose a driver Pick from specific location and point to the unzipped directory 5 Click Finish 6 Amessage should appear Found USB Serial Port small bubble message at task bar 7 From specific location point to the same directory as above 8 Click Finish and it should be ready to use NOTE Linux Version The Mlink Linux version is also available from Arbiter 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 MLINK Software Tutorial 61 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
69. to Startup USB Connection 3 Click the Download Log Records button 4 Ifyou have records to download a Save Log As window should appear with supplied filename Click MLINK Software Tutorial 71 the Save button or type in another filename and click Save A Download records window should indicate the number of records downloaded and say Download Complete or will say Nothing to Download if there are no records to download Download Log Rd Downloaded 47 amp of 47 records 4 Download complete Sa 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 Downloading Power on the 928A and connect the USB cable l between the 928A and the computer Start Mlink and check for a green connection light If red go back to Startup USB Connection Click the Download Power Quality Records button If you have records to download a SaveAs window should appear with supplied filename Click the Save Downloaded 4 of 4 4 records z Download complete button or type in another filename and click Save A Download records window should indicate the number of records downloaded
70. tween the 928A and the circuit or meter under test 4 Press w to display the calculated Watt hours ENERGY VALUES Value Rec 0 00 Q h 0 00 0 0 VA h 0 000 Q Accum Time Note Del refers to the power delivered to the load and Rec refers to the power delivered to the source Operation 37 5 Press wn 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 measuring energy Since energy values require time to accumulate consider configuring the Auto Shutdown feature so that the 928A does not shut down during a measurement Prior to collect ing energy values set the Auto Shutdown feature to OFF See Auto Shutdown on page 14 38 Operation WAV Waveform 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 properly with at least one channel configured for voltage and or current If necessary refer to Configuring Channels A and B on page 20 2 Press the appropriate Signal Selection key in order to measure the signal properly for example press to select Channe
71. yed value will be updated each second To view flicker on the 928A you must select voltage for measurement channels A and or B Press and or and read the instantaneous flicker Flicker values are measured at approximately 100 millisec ond intervals and updated on the 928A display each second Pst Short Term Flicker Flicker is defined as Short Term Flicker and averages the flicker values over a configured time period in seconds The display shows a countdown 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 B To measure short term flicker Pst by the 928A you must select either Channel A or B and set the channel s to voltage Do this as follows Press and or and read the short term flicker 44 Operation PQ Power Quality Sags and Swells Method The Model 928A measures sags swells and power interrup tions by using the power quality triggering function follows the CBEMA method of measuring the signals at Channels A and B and compares 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 on the next page Power Quality data stored in the 928A is actually a record of sags and swells of any voltage or current applied to Channels A and B that exceed the set Point Limits

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