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User Manual: 62000212

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1. Please post or fax to Elettrotest Spa
2. The components of the complex impedance are filtered independently to minimise the effects of noise which would have random phase and would therefore be filtered out The magnitude of the voltage and current are also computed From the complex impedance the following parameters can be derived resistance inductance Capacitance impedance phase tans real imaginary Q factor imaginary real Values can displayed for either series or parallel models If the parameter option in LCR menu is set to auto VIW INTERFACE will display capacitance or inductance according to the phase of the measurement Alternatively 14 1 VIW INTERFACE 1N 3N user manual the display can be forced to capacitance inductance or impedance Capacitance is displayed with tan inductance is displayed with Q factor and impedance is displayed in its resistive reactive form and as magnitude The phase of the impedance is displayed with all options For phase critical impedance measurements is it possible to offset the phase measurement to allow for phase shift within the connection leads Note that the phase of the impedance is the opposite to the phase of the current in POWER mode This is because the impedance is defined as voltage current which considering the magnitude and phase of Z impedance V voltage and A current gives Zmagnitude Vmagnitude Amagnitude Zphase Vphase Aphase As the phase is referred to
3. TIA ELETTRONICA PROFESSIONALE ELETTROTEST m hy MF PROFESSIONAL ELECTRONICS VIW INTERFACE IN VIW INTERFACE 3N USER MANUAL ELETTROTEST User Manual cod 62000212 00 VIW INTERFACE 1N 3N user manual IMPORTANT SAFETY INSTRUCTIONS This equipment is designed to comply with EN 61010 1 2010 10 Safety requirements for electrical equipment for measurement control and laboratory use observe the following precautions Ensure that the supply voltage agrees with the rating of the instrument printed on the back panel before connecting the mains cord to the supply This appliance must be earthed Ensure that the instrument is powered from a properly grounded supply The inputs are rated at 1kV rms or dc cat II 600V rms or dc cat III Do not exceed the rated input Keep the ventilation holes on the underneath and rear free from obstruction Do not operate or store under conditions where condensation may occur or where conducting debris may enter the case There are no user serviceable parts inside the instrument do not attempt to open the instrument refer service to the manufacturer or his appointed agent Note Elettrotest Spa shall not be liable for any consequential damages losses costs or expenses arising from the use or misuse of this product however caused VIW INTERFACE 1N 3N user manual DECLARATION OF CONFORMITY Manufacturer Elettrotest Spa Address P zza R Riello 20 B 45021 Badia Po
4. 9 step directly to that point in the list which provides a quick way to jump through long lists There is no need to press the ENTER key with this data type For example if the smoothing selection list comprises the options normal item 0 slow item 1 none item 2 and the presently selected option is normal there are 3 ways to select none press RIGHT twice times press LEFT once press number 2 4 3 VIW INTERFACE 1N 3N user manual 4 2 Numeric data entry Parameters such as external shunt impedance and scale factor are entered as real numbers shunt impedance is an example of an unsigned parameter scale factor is an example of a signed parameter Real numbers are entered using the number keys multiplier keys decimal point key or key if signed value is permitted When the character string has been entered pressing the ENTER key sets the parameter to the new value Until the ENTER key is pressed pressing the HOME key aborts the data entry and restores the original number If a data value is entered that is beyond the valid limits for that parameter then a warning is issued and the parameter set as close to the requested value as possible For example the minimum user defined measurement window 10ms if a value of 5ms is entered a warning will be given and the amplitude set to the maximum of 10ms When the parameter is first selected there is no character cursor visible in this condition a new number m
5. VIW INTERFACE 1N 3N user manual 5 Special functions 5 1 Display zoom VIW INTERFACE normally displays many results on the screen in a combination of small font size no zoom and up to 4 values in a larger font size first zoom level There is also an even larger font for up to 4 selected values second zoom level The second zoom level with the largest font has the option of increasing the displayed data resolution via the SYSTEM OPTIONS menu To set the data values for the larger font size first return to no zoom by pressing ZOOM twice if necessary Press ZOOM key to view the presently selected data and press DELETE to clear the selection A flashing box surrounds the first available result The flashing box is moved around the available results using the cursor keys UP DOWN LEFT and RIGHT Pressing the ENTER key selects the result for zoom and the box ceases to flash Further results up to four in total can then be selected using the cursor keys in the same way a solid box remains around the already selected item and a new flashing box appears Having selected the desired results pressing the ZOOM key invokes the first zoom level pressing it again selects the higher level Pressing ZOOM steps back down one level each time Note that any of the parameters selected for the zoom function can be used as the input for the alarm monitoring and datalog 5 1 VIW INTERFACE 1N 3N user manual 5 2 PROG non v
6. cos 6 do 0 ay 27 bi 1 r v sin e de 0 For a sampled signal the formulae become i n 1 a 1 n yA v i cos 2rci n i 0 i n 1 b 1 n gt v i sin 2rci n i 0 where n is the number of samples for an integral number of complete cycles of the input waveform and c is the number of cycles These a and b values yield the further elementary parameters magnitude y a b phase angle tan b a 10 5 VIW INTERFACE 1N 3N user manual From these elementary a and b values of voltage and current the following secondary values can be derived fundamental Watts Va x A Vp X Ap fundamental VA Vmag X Amag fund power factor Wrung VArund fundamental VAr Va X Ab Vb X Aa The signs of Watts and VAr are a direct result of the computation watts has the sign of cos phase angle VAr has the sign of sin phase angle The sign of fundamental power factor is determined by convention such that a lagging current inductive load is shown as a positive power factor and a leading current capacitive load is shown as a negative power factor this is effectively the sign of sin phase angle Optionally the signs of fundamental VAr and power factor can be independently inverted 10 6 VIW INTERFACE 1N 3N user manual 10 2 Sum computations When in 3 phase wiring modes 2 Wattmeter or 3 Wattmeter the values for the total load are computed from the data for each
7. than TDD unless the measured rms current is greater than the entered rated current 13 2 VIW INTERFACE 1N 3N user manual The value for TRD and TDD will always be lower than the computed THD as rms is always greater than the fundamental i n TDD 1 rms V gt h 2 i 2 where hj is the i harmonic Harmonic phase can be selected instead of a thd computation and each harmonic in the series is computed as a magnitude and phase angle The number of harmonics used for THF TIF TRD TDD and series harmonic phase computation is selectable in the same way as for THD In all cases the harmonics are phase referred to Phase 1 voltage fundamental so that their in phase and quadrature components may be separately filtered to Minimise noise Accurate frequency synchronisation is essential for reliable harmonic measurement Good results can be obtained in a reasonable time using the medium speed setting which runs a little slower than other modes but for the best results use the slow speed setting 13 3 VIW INTERFACE 1N 3N user manual 14 Impedance meter The IMP mode on VIW INTERFACE uses the real and imaginary components at the fundamental frequency using DFT analysis as described previously to compute the impedance of the load and associated parameters From the fundamental components of voltage a jb and those of the current c jd VIW INTERFACE computes the complex impedance given by z fi a jb c jd
8. 15 way ribbon cable and the 15 pin D type port inverter Also connect together the SYNC BNC connectors on the back of the instruments with a BNC cable Press the AUX key on each instrument to set master slave to master and slave respectively The master slave selection is shown in the top left hand corner of the display Because the measurement window is set by the master instrument if the slave instrument is measuring a different frequency for example when measuring efficiency of a 3 phase inverter then the measurements on the slave will not be exactly synchronised to its frequency and may take a little longer to settle than usual However if the sslave function is selected this allows the slave unit to be independently synchronised It will then make measurements at the same time as the master but will not interrupt it and dynamic responses will be quicker and smoother In the event that either instrument changes range or detects a significant change in frequency then both instruments will resynchronise and waiting for data will be shown on the display 5 8 VIW INTERFACE 1N 3N user manual To synchronise data read over the communications ports first send HOLD ON to the master which puts both instruments in hold mode read the data from the master and slave then release HOLD on the master HOLD OFF 5 9 VIW INTERFACE 1N 3N user manual 6 Using remote control VIW INTERFACE is fitted with RS232 seri
9. 1N 3N user manual 3 Quick Start guide 3 1 Operating Mode Keys POWER INTEG HARM RMS IMP SCOPE G M k m u n Operating Mode selection Power on default is Power Analyzer diagram below shows single phase display Note that with no inputs connected display will be showing noise levels only POWER ANALYZER Arange 100mA coupling acrdc bandwidth wide total fundamental 3 2160 pl 24 646nl4 299 85pVA 24 891nv4 299 54 phar 3 4781nVAr 0 011 0 990 roltage 57 305m Y 1 1420mV current 5 1784mA4 21 797 pA frequency 1 9835MHz H3 18 330n4 74 37 dc watts 12 953 pl Press POWER INTEG HARM RMS IMP SCOPE to select directly except Phase Meter mode see below 3 1 VIW INTERFACE 1N 3N user manual Select Options Press key a second time or press MODE to access mode specific options diagram below shows Power Analyzer options POWER ANALYZER operating mode power analyzer 3 selected harmonic sum current total Press lt or gt key to adjust the display contrast Use Up and Down keys to highlight option ENTER to confirm see MENU CONTROL KEYS Parameter values within the selected option may be adjusted using Lor R keys or by entering a numeric value directly as indicated ENTER to confirm With Operating mode highlighted use L and R keys to cycle through operating modes and to access Phase Meter mode With adjust contrast highlighted L and R keys adjus
10. 50 53 58 59 61 63 64 65 66 67 D 2 VIW INTERFACE 1N 3N user manual acdc coupling phase 1 bandwidth phase 1 scale factor channel 1 scale factor channel 2 external shunt channel 1 external shunt channel 2 General parameters 5 6 digit resolution frequency phase reference voltage or current frequency reference Display parameters display page zoom level function zoomed on 1 function zoomed on 2 function zoomed on 3 function zoomed on 4 display type Advance parameters manual frequency DFT selectivity program jump enable current phase reference Datalog parameters datalog memory type datalog interval Maths parameters formula argument 1 sub argument 1 coefficient 1 argument 2 sub argument 2 coefficient 2 70 71 73 74 75 77 78 79 99 100 101 102 103 VIW INTERFACE 1N 3N user manual Application mode parameters application mode PWM filter ballast tracking speed PWM low frequency mode More maths parameters argument 3 sub argument 3 coefficient 3 argument 4 sub argument 4 coefficient 4 Power meter parameters wiring configuration integration type torque and speed enable torque scaling Nm V speed scaling Hz V pulses per revolution integration accumulated average sum current average phase 3 frequency reference power factor sign convention VAr sign convention efficiency computation range lock mechanical torque offset mechanical speed offset Harm
11. and sum power phase 3 and sum power In all cases either term may be input power or output power Total efficiency is computed from the total power fundamental efficiency is computed from the fundamental power In the case of mechanical power there is only the one measured power which is used both for total and fundamental 10 12 VIW INTERFACE 1N 3N user manual 11 Integrated power measurements In the INTEG mode VIW INTERFACE computes the following additional values Parameter Units Watt hours Wh VA hours VAh VAr hours VArh Average power factor Average rms voltage V Ampere hours Ah Fundamental watt hours Wh Fundamental VA hours VAh Fundamental VAr hours VArh Average fundamental power factor Average fundamental voltage V Fundamental ampere hours Ah The integrator is started by pressing the START key the elapsed time is displayed in the upper left corner of the display The integration can be stopped by pressing the STOP key then restarted by pressing the START key again To reset the accumulated values and time press the ZERO key While the integration is running pressing the REAL TIME key holds the displayed values but accumulation continues in the background Once started the integration continues to accumulate in the background even if the MODE is changed to POWER or RMS This allows the real time values to be displayed without disturbing the integration To
12. applied to reflect the severity of the potential interference of that harmonic on telephone communication TIF 1 rms V gt hi x t 2 i 1 where hj is the it harmonic and ti is the i weighting factor TIF is defined by IEEE standard 115 and the weighting factors are given in ANSI standard C50 13 The harmonic factors for TIF are specified for harmonics of 60Hz 13 1 VIW INTERFACE 1N 3N user manual THF Telephone Harmonic Factor is a similar computation to TIF but uses different weighting factors and is expressed as a percentage i n THF 1 rms V 2 hi x ti i 1 where h is the i harmonic and ti is the i weighting factor The THF computation and weighting factors have been implemented according to IEC standard 60034 part 1 1996 with amendments A1 1997 and A2 1999 The harmonic factors are specified for harmonics of 50Hz TRD Total Rated Distortion uses a different reference to scale the harmonic percentages instead of the fundamental The voltage harmonics are scaled by the rms voltage and the current harmonics are scale by the larger of the rms current or the rated current entered by the HARM menu The rms is computed from the series of harmonics i n TRD 1 ref V gt h 2 i 2 where h is the i harmonic and ref is rms or rated current Similarly TDD Total Demand Distortion scales the computed harmonic distortion by the measured rms For voltage TDD is the same as TRD for current TRD is less
13. count Analog bipolar 10V Measurement synchronization for 6 phase mode Master slave control and ELETTROTEST accessory port 320 x 240 dot LCD white LED backlight 135H x 430W x 250D mm excl feet VIW INTERFACE 1N 5 5kg 1 phase VIW INTERFACE 3N 6kg 3 phase 1000V rms or dc category II 90 265 rms 50 60Hz 35VA max 17 3 VIW INTERFACE 1N 3N user manual Standard Accessories Leads Connection cables Connection clips Documentation 17 4 Power RS232 USB 36Arms rated 2 meter long leads with 4mm stackable terminals 2x Yellow and 2x Black per phase Note 1 LC version instruments rated at 10Arms are supplied with 20Arms connection cables Note 2 HC version instruments rated at 50Arms are not supplied with connection cables or connection clips 4mm terminated alligator clips 2x Yellow and 2x Black per phase Calibration Certificate User manual with quick start guide Communications manual measured fundamental value VIW INTERFACE 1N 3N user manual Appendix A Accessories ACCESSORIES VIW INTERFACE 1N 3N user manual External shunts A range of high bandwidth external shunts are available to extend the operating range of the current measurements The external shunts are built using Elettrotest proprietary shunt design to give high accuracy from DC to 1MHz They are designed to comply with the safety standards of BSEN61010 1 to 1000V rms cat II The sense output is via sa
14. filter does not change the measured data at all it is only applied to the data for the frequency measurement PWM application mode also allows torque and speed to be simultaneously measured so that efficiency can be computed The approximate minimum motor speed that can be measured is 1200rpm 20Hz The frequency reference can be selected from the voltage current or the speed input the speed input gear ratio can be set if required To select PWM motor drive mode press the APP key select the mode with the cursor keys move down to the default settings option and press ENTER The filter and torque speed settings can now be selected The calculation for efficiency may be selected as the ratio of Phase 1 and phase 2 Slave sum and master sum Mechanical and sum Phase 3 and sum 9 1 VIW INTERFACE 1N 3N user manual 9 2 Lighting ballast Electronic lighting ballast waveforms consist of a high frequency carrier signal modulated by the line frequency VIW INTERFACE measures the line frequency independently of the input waveform frequency and synchronises the measurement period to the line frequency The carrier frequency measurement ignores any dead band around the zero crossing of the ac line to compute the actual switching frequency of the ballast Both the frequency measured on the input waveform and the frequency of the line input are displayed As the switching frequency can vary over the cycle the ana
15. if measuring dc There is a low frequency option that extends the frequency measurement down to 20mHz This low frequency option also applies a digital filter which can be useful when measuring in a low frequency noisy environment 8 2 1 Advanced options Pressing ACQU to access the acquisition control menu then the right arrow key gives access to some advanced options which would not be needed for normal measurement applications 8 6 VIW INTERFACE 1N 3N user manual The analysis for the fundamental component uses a DFT discrete Fourier transform algorithm The selectivity of the DFT analysis is a compromise between noise rejection of frequencies close to the frequency of the fundamental component and the required stability of the frequency component Selecting narrow increases the selectivity of the DFT analysis reducing the effective bandwidth which has the effect of improving the noise rejection It does however require that the frequency of the fundamental component is more stable In a noisy application any spikes present on the signal may push the instrument onto a higher range than is necessary for the signal being measured If the nature of the spurious spikes are such that they do not contribute to the measurement and can safely be ignored then the range can be manually set to the appropriate range for the signal to be measured and the instrument can be told to ignore any overload If using this mode it is wise to c
16. input waveform even if this is a longer period than the nominal update rate There are two time constants for the smoothing filter normal or slow or the filter can be deselected The nominal values are speed update normal slow time rate time constant constant fast 1 20s 0 2s 0 8s medium 1 3s 1 5s 6s slow 2 55 12s 48s very slow 10s 48s 192s 8 5 VIW INTERFACE 1N 3N user manual The smoothing response is usually set to auto reset where the filtering is reset in response to a significant change in data This speeds up the response of the instrument to changing conditions This function can be disabled so that the filtering has a fixed time constant which would have an exponential response to a step change The frequency may be measured from the voltage current or the speed input the speed input gear ratio can be set if required On a multi phase instrument any channel may be selected for the frequency measurement Phase angle measurements have to be made with reference to a specific input normally phase 1 voltage The phase angle reference can be set to current which is useful if operating the instrument with only current inputs or with low level voltage inputs In multi wattmeter wiring modes phase 1 is always used for the phase angle reference phase 2 or phase 3 is used when in single phase 2 wiring or single phase 3 wiring Normal frequency measurement is from 5Hz upwards so that there is not a very long delay
17. make an integrated measurement over a specific interval an integration run time can be entered in hours and minutes The integration will automatically stop when the integration timer reaches the value entered as if the VIW INTERFACE 1N 3N user manual STOP button had been pressed Setting the integration time to zero disables the timer The Watt hour integration and the Ampere hour integration can be selected to be signed or magnitude To integrate the total power in terms of heating effect choose magnitude If signed integration is selected then the rms current is given the sign of the power before integration The Ampere hours and Watt hours then reflect the power taken by the load less any power generated by the load such as during regenerative braking in battery systems The integrated results may be displayed as the total accumulated values or as the average over the integration period 11 2 VIW INTERFACE 1N 3N user manual 12 True RMS Voltmeter The RMS voltmeter displays the additional secondary parameters of ac crest factor surge mean and form factor Having computed the true rms and the dc component the ac component can be derived from rms ac de gt ac rms de Crest factor is derived from the peak and rms cf peak rms In order to measure surge conditions the maximum instantaneous peak value unfiltered is also recorded It is important that VIW INTERFACE does not autorange while
18. other phase inputs are completely ignored and the selected phase acts as a completely independent single phase power analyser In the 3 phase 2 wattmeter configuration the voltages are measured relative to phase 3 The phase 1 voltage input is connected across phase 1 and phase 3 and phase 2 voltage input is connected across phase 2 and phase 3 thus measuring phase to phase voltage directly Phase 1 and 2 current inputs are connected normally There is no need to measure the current in phase 3 as phase 3 has no voltage relative to itself so the power contribution is zero In this mode the neutral channel displays the synthesised phase 3 current The advantage of this connection method is that 3 phase power can be measured with only 2 wattmeters This frees up phase 3 of a 3 phase instrument to simultaneously measure the power of a single phase input 3 phase 2 wattmeter phase 3 configuration This allows direct measurement of efficiency in a 3 phase motor drive or 3 phase inverter application The frequency reference for the independent phase 3 may be selected to be voltage current the mains line frequency or the same as phase 1 amp 2 In this mode frequencies up to 1kHz can be measured with phase 3 With the 3 phase 3 wattmeter configuration each measurement phase is connected to a phase of the load with the voltage inputs measuring to neutral In this mode 8 1 VIW INTERFACE 1N 3N user manual phase to neutral voltage
19. the voltage Zphase Aphase Therefore using the phase convention from 180 to 180 an inductive load which has an impedance with positive phase would cause a current with negative phase 14 2 VIW INTERFACE 1N 3N user manual 15 Oscilloscope mode VIW INTERFACE provides a storage oscilloscope function in order to view the waveforms being measured The display for the oscilloscope is divided into 10 divisions along the time axis with the selected timebase displayed in units of time division The timebase may be set to any real value between 10us div to 5s div using the SCOPE menu Pressing LEFT and RIGHT adjust the timebase by a factor of 2 For slow timebase operation gt 0 8s div the display operates in roll mode where the waveform scrolls across from left to right until triggered Two cursors can be enabled on the display If cursors are on in the menu press SCOPE or MODE then the LEFT and RIGHT key mode the selected cursor UP and DOWN toggle which cursor is selected The time difference between the 2 cursors delta t is displayed on the lower left of the display When the cursors are enabled LEFT and RIGHT no longer adjust the timebase The vertical scaling is shown as a full scale value rather than as a V cm This indicates the range that the instrument is using for each channel Triggering is very important to obtain a stable trace and there are various options to control the trigger sou
20. very good CMRR and noise rejection The current shunt is of a proprietary design which gives very wide bandwidth with minimum phase shift The voltage attenuator is of a proprietary design which has a wide bandwidth response matched to that of the current shunt Both the voltage and current channels are calibrated digitally so there are no physical adjustments to be made 1 2 VIW INTERFACE 1N 3N user manual 2 Getting started VIW INTERFACE is supplied ready to use it comes complete with an appropriate power lead and a set of test leads It is supplied calibrated and does not require anything to be done by the user before it can be put into service 2 1 Unpacking Inside the carton there should be the following items one VIW INTERFACE unit one appropriate mains lead two yellow and two black 4mm leads per phase two yellow and two black crocodile clips per phase one null modem cable one USB cable this manual Before connecting the test leads to an active circuit first connect the mains cord from a properly grounded supply outlet to the inlet on the rear panel of the VIW INTERFACE VIW INTERFACE has a universal mains input and accepts any supply voltage from 90 265Vrms at 50 or 60Hz Switch on the VIW INTERFACE The display should illuminate with the model name and the firmware version for a few seconds while it performs some initial tests It should then default to the power measurement display Note that the switch on me
21. 3 6 VIW INTERFACE 1N 3N user manual COUPLING appropriate to input signals RANGE configure according to magnitude voltage and current of input signals DATALOG only available for Power Analyzer sampling interval data retained or not at power down Default is disabled See also Table Graph in DISPLAY CONTROL KEYS APP application specific measurements e g PWM motor drive MATHS no options available at present ALARM audible visual indication of thresholds crossed set by ZOOM values see DISPLAY CONTROL KEYS Default is disabled REMOTE configure external comms AUX no options available at present SYS configure general system features MODE see OPERATING MODE KEYS PROG save recall or delete Mode Display and Setup configurations for user defined applications Recall data saved in Datalog see DATALOG key above FOR NUMERIC ENTRY see DATA ENTRY GUIDE 3 7 VIW INTERFACE 1N 3N user manual 3 5 Control Keys O ZERO O TRIGGER O START amp STOP datalog function when enabled or integration INTEG mode Either key also triggers single shot in SCOPE mode Use ZERO key for a Zero compensation of input amplifier chain and test lead compensation USER MANUAL b Reset integrator to zero INTEG mode TRIGGER or START returns display to Real Time from Hold Also triggers single shot in SCOPE mode 3 8 VIW INTERFACE 1N 3N user manual 3 6 Scope Mode
22. CE has 2 extra inputs to measure the mechanical power of motors or generators Torque is measured in Nm with a 10V analogue input scaled in Nm V Speed is measured in rpm either with a 10V analogue input scaled in rpm V or as a pulse input which can be scaled with pulses revolution An offset can be entered to allow for dc offset within the torque and speed sensors The scaled value is derived as Torque or speed measured value offset x scale The speed offset only applies to analogue speed not pulsed The offset values can be entered directly in the APP menu or by pressing ZERO then home in the APP menu ie no menu items are highlighted To use the ZERO function press APP move down to enable the torque and speed press HOME to return the cursor to the home position then press ZERO The presently measured values will be entered automatically as the offsets The mechanical power is given by Wmech torque x angular velocity rad s torque x speed rpm x 60 x 21 The mechanical power can then be used to compute efficiency as efficiency mechanical power sum power motor or efficiency sum mechanical power generator The measurement of mechanical power is made simultaneously with the electrical measurements over the same window 10 11 VIW INTERFACE 1N 3N user manual 10 6 Efficiency Efficiency may be computed as a ratio of phase 1 and phase 2 power master and slave power mechanical
23. ERFACE 1N 3N user manual When supervisor mode is disabled see system options programs can only be recalled not stored nor deleted to avoid accidental modification When recalling a program it may be desirable for the program to recall the selected communications interface that was in use when the program was stored RS232 or USB etc Alternatively it is more common for the communications interface to be associated with the instrument rather than a stored program There is a selectable option in the REMOTE menu to enable the recall with program If this is off then recalling the program will not change the communications interface Datalog can be stored directly into non volatile memory or can be logged to RAM and stored subsequently The data then can be recalled for viewing or to download to a PC for further analysis There is a single non volatile location for holding the datalog Measurement results can be stored in one of 20 locations Press HOLD to hold the results press PROG and select memory results Each location holds the entire set of computed results for all the phases no matter what phase is on the display Oscilloscope and harmonic series data can also be stored but these take 3 contiguous locations each because of the large amount of data In each case the full instrument set up is stored with the data and recalled so that measurements may easily be repeated and verified 5 3 VIW INTERFACE 1N 3N user
24. IW INTERFACE lines beginning with are commands for CommVIEW any other line is a comment The commands that are recognised beep sound the beeper on the PC label i string apply a label to data value i pause t wait for time t reply t wait time t for a reply For an example script file look at example scr on the CommVIEW release disc Other functions in CommVIEW save results results menu set COM port parameters configure menu firmware upgrade instrument menu read store user programs instrument menu A 6 VIW INTERFACE 1N 3N user manual Appendix B Serial command summary command format CLS ESE value ESE ESR IDN OPC RST SRE value SRE STB TRG TST WAI ABORT ALARM latch sounder ALARM ALARME value ALARM1 type data hi lo ALARM2 type data hi lo APPLIC type setting BANDWI phase type BEEP BLANKI on off threshold CALVER string CALVER CONFIG parameter data CONFIG parameter COUPLI phase coupling DATALO function interval DATALO LINES DATALO 0 DATALO start records DAV DAVER value DAVER DISPLAY phase DISPLAY EFFICI type EFFICI FAST on off reply format single integer data value single integer data value company product serial no version Oorl single integer data value single integer data value single integer data value single integer data value string single integer or real data value single integer data value index time data one
25. S index value CALTQS Four real data values B 4 VIW INTERFACE 1N 3N user manual Appendix C Available character set The following characters can be selected in text entry mode The table is to be read across then down eg starting at space and repeatedly pressing NEXT gives amp etc amp K y 0 1 2 4 5 6 7 8 9 lt gt A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ws a b C d e f g h i j k m n O p r S t u V Ww Z VIW INTERFACE 1N 3N user manual Appendix D Configurable parameters All parameters can be accessed using the CONFIG command CONFIG parameter CONFIG parameter data Number Function System parameters 1 operating mode 3 master slave 4 autozero manual or auto 5 blanking disable 6 phase convention 7 manual frequency on off 8 line drawing on off 9 keyboard beep on off 10 ignore overrange 11 low frequency mode 12 user window size 13 measurement speed 14 filter type 15 filter dynamics 16 baud rate 17 program step enable 18 LAN IP address nibble 3 19 LAN IP address nibble 2 20 LAN IP address nibble 1 21 LAN IP address nibble O 22 Independent input control Input parameters phase 1 24 enable channel 1 25 enable channel 2 26 input range channel 1 27 input range channel 2 28 input ranging channel 1 29 input ranging channel 2 D 1 30 31 32 34 35 38 40 41 42 44 45 46 47 48 49
26. SYSTEM OPTIONS menu displays the serial number manufacture code release versions and calibration date These cannot be changed by the user 7 2 VIW INTERFACE 1N 3N user manual 7 1 User data VIW INTERFACE can be personalised by entering up to 3 lines of user data as text see section on text entry User data is displayed every time that the instrument is switched on to identify the instrument The entered text may also be read over the communications to identify the instrument see USER Typical arrangement of the user data might be line 1 company name line 2 department or individual name line 3 unique identifying number eg asset number Any user data may be entered as required as the lines are treated purely as text and are not interpreted by VIW INTERFACE at all After changing the user data execute store to save the data in non volatile memory For use in a production environment VIW INTERFACE supports two modes of operation supervisor and user When supervisor mode is disabled the stored programs can only be recalled not changed VIW INTERFACE saves the mode of operation with the user data so that it may be configured to power up in either mode as required 7 3 VIW INTERFACE 1N 3N user manual 8 Measurement options 8 1 Wiring configuration The three phase version VIW INTERFACE 3N can be used in a variety of wiring configurations In the single phase modes phase 1 phase 2 phase 3 the
27. Selecting SCOPE mode from the OPERATING MODE KEYS or by cycling through the operating modes in any of the Operating Mode Select Options displays voltage and current waveforms as a conventional oscilloscope diagram below shows the default display with no inputs connected OSCILLOSCOPE Krange 11 Arange 100m4 coupling ac dc bandwidth wide PH1 voltage current 10 00ms di The following diagram shows the options available in SCOPE mode OSCILLOSCOPE operating mode oscilloscope timebase 5 0000m s div trigger phase phase 1 trigger reference voltage trigger level 200 00m F trigger type auto trigger polarity rising edge trigger HF reject off pretrigger 20 cursors off Press lt or gt key to adjust the display contrast 3 9 VIW INTERFACE 1N 3N user manual A typical display of voltage and current waveforms for a switched mode power supply is shown below OSCILLOSCOPE Vrange 3001 Arange 14 coupling ac de bandwidth wide PH1 voltage a 5 000ms div When operating in the oscilloscope mode the left and right control keys operate in one of two modes A With the cursor option off default the left and right control keys change the timebase B With the cursor option on the left and right control keys change the cursor position and the up or down keys toggle between cursor 1 control and cursor 2 control 3 10 VIW INTERFACE 1N 3N user manual 3 7 Data Entry Guide TEX
28. T ENTRY Enter text via the six function keys in the upper right of the panel Each function key jumps to a different letter of the alphabet POWER A INTEG E HARM I RMS O IMP U SCOPE space Choose other characters by stepping forward or backward using the UP and DOWN keys Select upper lower case with the ZOOM ZOOM keys Values may be overwritten or edited by use of the RIGHT LEFT and DELETE keys NUMERIC ENTRY Use MODE ENTRY KEYS for number multiplier decimal point or to enter parameter value Press ENTER MENU CONTROL KEYS to set value Press HOME MENU CONTROL KEYS to abort data entry restore original Values may be overwritten or edited by use of the R L and DELETE keys 3 11 VIW INTERFACE 1N 3N user manual 4 Using the menus VIW INTERFACE is a very versatile instrument with many configurable parameters These parameters are accessed from the front panel via a number of menus Each of the main menus may be accessed directly from a specific key ACQU data acquisition parameters such as speed and filtering COUPLING select ac dc coupling and bandwidth RANGE select input ranges and scaling DATALOG specify datalog parameters APP Application specific functions MATHS User defined computations ALARM control of audible alarm and analogue output REMOTE communications options RS232 etc AUX control of auxiliary devices connected to t
29. TERFACE 1N 3N user manual 9 5 Standby power measurement In order to minimise standby power some devices operate in a dormant mode whereby power is only drawn from the supply when needed These devices draw very little current for most of the time and then draw a larger current for a single cycle to charge a reservoir capacitor This pattern is repeated on an irregular basis Most of the power consumed by devices in this mode is taken in the periodic higher current cycles so to accurately measure the power drawn by these devices so the instrument synchronises to the power frequency for the analysis but extends the measurement window to the irregular period of higher energy pulses Because the instrument samples in true real time without any gaps no data is missed and every power cycle is captured It is important that ranging is set to manual or up only autoranging so that the power cycles are not missed while ranging 9 5 VIW INTERFACE 1N 3N user manual 10 Power measurements In the POWER mode VIW INTERFACE measures the following values for each phase Parameter Type Units Frequency elementary Hz True power elementary W Apparent power secondary VA Reactive power secondary VAr Power factor secondary RMS voltage elementary V RMS current elementary A Fundamental power secondary W Fundamental VA secondary VA Fundamental VAr se
30. W INTERFACE 1N 3N user manual 6 2 Serial Poll status byte ESB MAV ALA FDV RDV bit 0 RDV bit 2 FDV bit 3 ALA bit 4 MAV bit 5 ESB result data available set when results are available to be read as enabled by DAVER fast data available streaming set when data streaming results are available to be read as enabled by DAVER alarm active set when an alarm becomes active as enabled by ALARMER message available set when a message reply is waiting to be read standard event summary bit set if any bit in the standard event status register is set as well as the corresponding bit in the standard event status enable register set by XESE 6 5 VIW INTERFACE 1N 3N user manual 6 3 RS232 connections The RS232 port on VIW INTERFACE uses the same pinout as a standard 9 pin serial port on a PC or laptop 9 pin male D type Pin Function Direction 1 DCD in weak pull up 2 RX data in 3 TX data out 4 DTR out 5 GND 6 DSR not used 7 RTS out 8 CTS in 9 RI not used VIW INTERFACE will only transmit when CTS pin 8 is asserted and can only receive if DCD pin 1 is asserted VIW INTERFACE constantly asserts 12V DTR pin 4 so this pin can be connected to any unwanted modem control inputs to force operation without handshaking VIW INTERFACE has a weak pull up on pin 1 as many null modem cables leave it open circuit In electrically noisy environments th
31. al communications port and a USB port as standard and may have an IEEE488 GPIB interface or LAN interface fitted as an option All the interfaces use the same ASCII protocol with the exception of the end of line terminators Rx expects Tx sends RS232 Carriage return carriage return USB line feed ignored and line feed LAN IEEE488 Carriage return or carriage return line feed or EOI with EOI All the functions of VIW INTERFACE can be programmed via any of the interfaces and results read back When the IEEE488 interface is set to remote the RS232 port is ignored The commands are not case sensitive and white space characters are ignored e g tabs and spaces Replies from VIW INTERFACE are always upper case delimited by commas without spaces Only the first six characters of any command are important any further characters will be ignored For example the command to set the bandwidth is BANDWI but BANDWIDTH may be sent as the redundant DTH at the end will be ignored Fields within a command are delimited by comma multiple commands can be sent on one line delimited with a semi colon Eg BANDWI LOW SPEED SLOW Mandatory commands specified in the IEEE488 2 protocol have been implemented e g IDN RST and all 6 1 VIW INTERFACE 1N 3N user manual commands that expect a reply are terminated with a question mark Data values returned by VIW INTERFACE are in scientific notation
32. anual PROGRAM function number PROGRAM RANGE ch ranging range RESOLU format RESULT function number RESULT REZERO SCALE channel factor SCALE channel SCOPE phase v a SHUNT channel resistance SHUNT channel SMOOTH type dynamics SPEED value window START STATUS channel STOP STREAM enable window STREAM disable STREAM SUSPEN on off TEMPER type scale offset TEMPER TORQSP type tscale sscale TORQSP OFFSET toff soff TORQSP USER VARCON convention VERSION VRMS VRMS PHASE RMS VRMS PHASE MEAN VRMS PHASE SURGE WIRING configuration ZERO ZERO DELETE ZOOM level d1 d2 d3 d4 ZOOM CR terminated text string multiple integers Single real data value range trigger 250 signed integer data values Single real data value Range number range text over low ok Data data data data data single real data value Mechanical power torque speed 3 CR terminated text strings Datecode cpu dsp fpga boot Rms1 rms2 dc1 dc2 ac1 ac2 Rms1 rms2 mean1 mean2 ff1 ff2 Pk1 pk2 cf1 cf2 surge1 surge2 Level d1 d2 d3 d4 B 3 VIW INTERFACE 1N 3N user manual calibration commands CALAPP CALCOM freq CALFIL index value CALFIL Six real data values CALFRQ index freq CALFRQ Seven real data values CALIBR index value CALIBR Single integer data value CALIDS string CALIDS String CALPHA index CALRES CALSAV password CALSNO serial number CALSTR string CALSTR String CALTQ
33. ated power measurements 0ccceeeeeees 11 1 True RMS Voltmeter ee 12 1 Harmonic analyser 00ooccccccnnccncncccancnnannn nn nn nn 13 1 Impedancemeten s ee an 14 1 Oscilloscope mode Area Nena 15 1 Phase Metern sie 16 1 Specifications ae 17 1 17 vi Appendix A Appendix B Appendix C Appendix D Appendix E VIW INTERFACE 1N 3N user manual APPENDICES Accessories Serial command summary Available character set Configurable parameters Contact details vii VIW INTERFACE 1N 3N user manual 1 Introduction general principles of operation VIW INTERFACE is a sophisticated and versatile power analyser for accurate wide bandwidth power measurements Model VIW INTERFACE 1N is for single phase applications and model VIW INTERFACE 3N is for 3 phase applications Each phase input has wide ranging voltage and current channels which are fully isolated from each other and from ground The voltage input has a built in high voltage attenuator or may be used with an external attenuator The current input has a built in current shunt or may be used with an external shunt The voltage and current inputs are simultaneously sampled and the data is analysed in real time by high speed DSPs digital signal processors A separate CPU central processing unit takes the DSP results for display and communications At the heart of the system is an FPGA field programmable gate array that interfaces the various elements This pow
34. ay be entered directly and will overwrite the existing number To edit a data value rather than overwrite it press the RIGHT key and a cursor will appear New characters are inserted at the cursor position as the keys are pressed or the character before the cursor position can be deleted with the DELETE key Data values are always shown in engineering notation to at least 5 digits 1 0000 999 99 and a multiplier 4 4 VIW INTERFACE 1N 3N user manual 4 3 Text entry There are occasions where it is useful to enter a text string for example a non volatile program may have some text as a title Text is entered by selecting one of 6 starting characters using the function keys on the top right hand row of the keyboard then stepping forwards or backwards through the alphabet with the UP and DOWN keys The starting letters from left to right are A E I O U or space Numbers can also be inserted using the number keys The UP and DOWN keys step forward and backward using the ASCII character definitions other printable characters such as or can be obtained by stepping on from the space The available character set is given in the Appendix When entering alphabetic characters the ZOOM and ZOOM keys select upper and lower case respectively for the character preceding the cursor and the next characters to be entered The editing keys RIGHT LEFT DELETE and ENTER operate in the same way as for numeric entry 4 5
35. condary VAr Fundamental power factor secondary Voltage fundamental elementary V Current fundamental elementary A Voltage magnitude secondary V Current magnitude secondary A phase secondary degrees Voltage harmonic elementary V Current harmonic elementary A Voltage harmonic magnitude secondary V Current harmonic magnitude secondary A DC voltage elementary V DC current elementary A dc power secondary W Peak voltage elementary V Peak current elementary A Rectified mean voltage elementary V Rectified mean current elementary A All elementary parameters eg Watts are computed from their true definitions in real time so the measurements are 10 1 VIW INTERFACE 1N 3N user manual valid for all waveshapes Secondary parameters are computed from one or more of the elementary parameters eg VA Vrms x Arms Not all of the parameters listed are displayed in POWER mode but they are all computed A multi phase instrument also computes the equivalent values for total power SUM channel and the values for the NEUTRAL current Step through the phase values with NEXT and BACK The measurements are computed over rectangular windows with no gaps The processing power of the DSPs allows the measurements to be made in true real time without missing any samples In this way the measured power is a true value even if the signal is fluctuating The only occasion when data is missed is when an autozero measurement is requ
36. d for quiet environments if the feel of the key is sufficient feedback Regular autozero measurements can be suppressed The 6 main function keys POWER INTEG HARM RMS IMP SCOPE can be used to load stored configurations as a one touch way of configuring the instrument for specific applications This is particularly useful in a production environment where an operator has a small number of specific tests to perform The data displayed in zoom level 2 may be shown to one digit greater resolution than normal This is particularly useful when measuring phase at power line frequencies where the normal resolution of 0 01 is not sufficient 7 1 VIW INTERFACE 1N 3N user manual On a multi phase instrument all the phases usually use the same input control data internal external scaling factor etc It is possible to select independent input control so that the phases can be set up differently This is useful if different scaling factors are required for external shunts or if one phase is using internal shunt when others are external To save these system settings as default store the setup in program 1 so that they are reloaded on power on Pressing RIGHT from the SYSTEM OPTIONS menu selects the USER DATA screen where up to three lines of user specified text may be entered The first line is displayed on power up all three lines may be read remotely by the command USER to identify the instrument Pressing LEFT from first
37. e fully isolated from each other and from earth with very high CMRR common mode rejection ratio They are controlled independently but sampled synchronously Each input channel has an external input as well as an internal shunt or high voltage attenuator The external input gives versatility in the input ranging by using external shunts or attenuators If the external shunt or external attenuator option is selected the data is scaled by the appropriate value entered under the relevant channel menu Precision low inductance current shunts or current transformers may be used with the current channels high voltage attenuators or oscilloscope probe may be used with the voltage channels Note that when using external shunts or attenuators on high voltage Signals the inputs must not exceed 1000V rms cat II or 600V cat III to ground There are 8 input ranges with nominal full scale values set with a ratio of 1 10 This gives the following nominal peak ranges range _ internal internal external current voltage input 1 100mA 1V 1mV 2 316mA 3 16V 3 16mV 3 1A 10V 10mV 4 3 16A 31 6V 31 6mV 5 10A 100V 100mV 6 31 6A 316V 316mV 7 100A 1kV 1V 8 316A 3 16kV 3 16V 8 10 VIW INTERFACE 1N 3N user manual The actual ranges have approximately 20 overload headroom so for example the 300V range which has a nominal full scale of 316V pk has an actual peak input value of 380V allowing for the 20 headroom The ranges may be select
38. e switching spikes may push the input channels onto a higher range than is necessary for the measurement Selecting low bandwidth puts a hardware filter in the analogue input path to eliminate unwanted high frequency components The DC only bandwidth option applies a dc accurate low pass filter of around 10Hz to reduce the ac signal This is particularly useful when accurately measuring the dc content of an ac waveform such as the output of a UPS uninterruptible Power Supply A 50Hz or 60Hz ac signal would not be removed entirely so that the measurement may still be synchronised to the waveform but the amplitude would be greatly reduced so that the instrument would be on a more appropriate range for the dc component In multi phase applications if independent input control has been set see system options then the coupling and bandwidth options are independently set on each phase 8 8 VIW INTERFACE 1N 3N user manual Coupling Bandwidth Measurement Notes option option bandwidth ac dc wide dc 2MHz default ac dc low dc 30kHz ac dc dc dc 5Hz ac wide 5Hz 2MHz ac low 5Hz 30kHz ac dc dc 5Hz dc bandwidth overrides ac coupling dc wide dc 2MHz dc coupling disables auto frequency search and no compensation is applied dc low dc 30kHz T dc dc dc 5Hz 8 9 VIW INTERFACE 1N 3N user manual 8 4 RANGE input channel options All the input channels ar
39. ed manually or by autoranging default To speed up the autoranging the start range for autoranging may be selected if it is known that the signal will not be below a certain level There is alSo an option to autorange up only so that a test may be carried out to find the highest range Once the highest range has been determined the range can be set to manual and the test carried out without losing any data due to range changing Pressing the TRIGGER key or sending TRG restarts the autoranging from the selected minimum range In multi phase applications it is usual to allow the phases to independently range but there is an option to lock the ranges across the phases When enabled this means that all the voltage channels will be on the same range and all the current channels will be on the same range When in an input channel menu the ZERO key provides a quick way to lock and unlock the range When no flashing box is visible in the input channel menu and autoranging is selected pressing the ZERO key selects the range that the instrument is currently using and sets the autoranging to manual thus locking the range and preventing further autoranging Pressing the ZERO key again returns to full autoranging from the bottom range For most measurement functions full autoranging is the most suitable option but some applications such as where transient events are occurring are more reliable with 8 11 VIW INTERFACE 1N 3N use
40. erful versatile structure allows the measurement of a wide range of power related parameters including W VA VAr power factor phase true rms fundamental harmonics TIF integrated values W hours etc impedance inrush current voltage surge oscilloscope VIW INTERFACE is particularly easy to use with a large clear display and single menu levels for all main parameters Even difficult applications such as PWM motor 1 1 VIW INTERFACE 1N 3N user manual drives and lighting ballasts can be easily addressed with special modes application in the firmware of the instrument and dedicated hardware functions including torque speed inputs and ac line sync The whole operation of the instrument may be controlled remotely via a serial interface RS232 USB or optionally LAN interface or GPIB interface The voltage and current channels are identical except for the voltage attenuator and current shunt at the very front end Each channel consists of a selection switch for external or internal attenuator shunt followed by a high impedance buffer bandwidth control then a series of gain stages leading to an A D converter Selection of the input gain and the sampling of the A D converter are under the control of the DSP There is an autozero switch at the front end for dc accuracy The analogue circuitry is optimised for high linearity over a wide dynamic range and high frequency performance Both input channels are fully isolated with
41. ested this can be disabled in the SYTEM OPTIONS menu The elementary values are individually filtered before being used for secondary computations 10 2 VIW INTERFACE 1N 3N user manual 10 1 Individual phase computations The power dissipated in a load subjected to a periodic voltage v with a current flowing a is given by 21 w 1 2x v 9 a s de 0 For a sampled signal the formula becomes i n 1 w 1 n Y vlil ali i 0 where n is the number of samples for an integral number of complete cycles of the input waveform The rms value of a periodic waveform v 6 is given by 2n rms y 1 27 v 4 do 0 For a sampled signal the formula becomes i n 1 rms y 1 n gt v i i 0 where n is the number of samples for an integral number of complete cycles of the input waveform 10 3 VIW INTERFACE 1N 3N user manual The dc present is given by 2n dc 1 21 v d 0 For a sampled signal the formula becomes i n 1 dc 1 n Y vii i 0 where n is the number of samples for an integral number of complete cycles of the input waveform From these elementary values of W rms and dc the following secondary values can be derived VA Vims X Arms VAr y VA W power factor W VA Wac Vac X Aac 10 4 VIW INTERFACE 1N 3N user manual The fundamental in phase and quadrature values of a periodic waveform v are given by 27 1 x v
42. fety BNC connection to connect to the instrument the current connections depend on the device Part numbers HFOO3 HFOO6 HFO2O HF100 HF200 HF500 A 2 470mQ 3A rms 4mm safety 100mQ2 6A rms 4mm safety 10mQ 20A rms 4mm safety 1m 100A rms safety terminals 500u2 200A rms M10 bolt 200u2 500A rms M16 bolt VIW INTERFACE 1N 3N user manual PCIS Phase controlled inrush switch To measure the maximum inrush current of a load it is important to switch on the supply to it at the worst point in the cycle usually 90 or 270 for a capacitive load 0 or 180 for an inductive load The PCIS is an active device which is controlled by VIW INTERFACE over the extension port It accurately synchronises to the line input measures the frequency and switches on the output at a precise phase angle selectable from the VIW INTERFACE front panel in steps of 45 Part numbers PCIS Phase Controlled Inrush Switch A 3 VIW INTERFACE 1N 3N user manual Ultra low capacitance high voltage probes The VIW INTERFACE voltage inputs have a capacitance to ground of around 50pF but even this low value can cause problems with high frequency high voltage waveforms The ultra low capacitance high voltage probes use a differential input arrangement optimised for minimum capacitance to achieve an input capacitance to ground less than 1pF with an input range up to 3kV pk and a bandwidth from dc to 2MHz 1dB The probes connect to the external vol
43. fundamental magnitude and phase Additional values for dc ac peak and crest factor are displayed in RMS mode 10 8 VIW INTERFACE 1N 3N user manual 10 4 Phase to phase computations In 3 phase 3 wattmeter configuration the voltmeters are connected across each individual phase and neutral The phase to phase voltages are synthesised from the individual phase data display phase computation phase 1 phase 1 phase 2 phase 2 phase 2 phase 3 phase 3 phase 3 phase 1 Phase to phase values are computed for rms fundamental magnitude and phase Consider the fundamental component Vi2 t Vi t Va t Vi sin wt Vasin wt 1 gt Vi sin wt V2 sin wt cos 12 cos wt sin 2 sin wt Vi V2 cos P1 gt 2 V2 cos wt sin p gt In a balanced system Vi V V2 V and 9 120 Viz sin wt V V cos 120 V cos wt sin 120 1 5 V sin wt V3 2 V cos wt V3 V sin wt 30 So the phase to phase voltage would have a magnitude V3 times larger than the phase to neutral voltage at a phase displacement of 30 VIW INTERFACE applies the computations in the general way without any assumptions about the system It therefore computes the correct values whatever the waveform 10 9 VIW INTERFACE 1N 3N user manual The phase to phase values may also be displayed as a rectified mean measurement 10 10 VIW INTERFACE 1N 3N user manual 10 5 Mechanical power VIW INTERFA
44. g 0 004 KHz 1mV Current 10A hi error Current 0 04 hi rdg 0 04 rng 0 004 KHz 10uA 30A hi error Current 0 04 hi rdg 0 04 rng 0 004 KHz 100uA 50A hi error Current 0 04 hi rdg 0 04 rng 0 004 KHz 100uA Common Mode Rejection Total Common Mode and Noise effect on current channels Applied 250V 50Hz Typical 1mA 150dB Applied 100V 100kHz Typical 3mA 130dB Datalog Functions Up to 4 measured functions user selectable Datalog window From 10ms with no gap between each log Memory RAM or non volatile up to 8000 records 17 2 VIW INTERFACE 1N 3N user manual High Speed Data Streaming Rate Window Buffer General Crest factor Sample rate Low power accuracy Remote operation Application modes Ports RS232 LAN option L GPIB option G USB Speed Torque Sync Extension Physical Display Size Weight Safety isolation Power supply Up to 1000 reading s single phase ims to 1s synchronized to waveform Up to 8000 records Voltage and Current 20 Real time no gap 2 2Ms s on all channels Compliant with IEC62301 2011 using internal shunt Refer to low power measurement application note Full capability control and data PWM Motor Drive Ballast Inrush Power transformer Baud rate to 19200 RTS CTS flow control 10 100 base T Ethernet auto sensing RJ45 IEEE488 2 compatible USB device 2 0 and 1 1 compatible Analog bipolar 10V or pulse
45. he rear EXTENSION port SYSTEM general system options such as phase convention keyboard beep etc MODE function control PROG recall store delete of non volatile programs and datalog Each menu starts with the currently set parameters visible but no cursor In this condition pressing the menu key again or the HOME key aborts the menu operation and reverts back to normal operation To select any parameter press the UP or DOWN key and a flashing box will move around the menu selecting each parameter In this condition the keys take on their secondary function such as numbers 0 9 multipliers n G etc 4 1 VIW INTERFACE 1N 3N user manual Pressing the HOME key first time reverts to the opening state where the parameters are displayed but the cursor is hidden Pressing the HOME key at this point exits the menu sequence and reverts back to normal operation To abort the menu sequence press the HOME key twice There are three types of data entry selection from a list numeric text 4 2 VIW INTERFACE 1N 3N user manual 4 1 Selection from a list This data type is used where there are only specific options available such as the smoothing may be normal slow or none the graph drawing algorithm may use dots or lines When the flashing cursor is highlighting the parameter the RIGHT key steps forward through the list and the LEFT key steps backwards through the list The number keys 0
46. heck the signal on the oscilloscope to be sure that the signal being measured is not genuinely overrange In a very noisy application where the frequency of the signal is known but VIW INTERFACE is unable to measure the frequency even with PWM filters or low frequency mode filters applied it is possible to enter the frequency to be used for analysis When frequency lock is selected to be Constant the present measured frequency is displayed but this can be overwritten with the known frequency This known frequency is then used for all analysis and the frequency of the input signal is not measured If Dynamic is selected and the frequency alters it automatically re adjusts and effectively tracks the frequency movement 8 7 VIW INTERFACE 1N 3N user manual 8 3 COUPLING coupling amp bandwidth options There are three coupling options AC only or AC DC or DC only AC DC coupling is the normal option and should be used where possible AC coupling should be used for measuring signals that are biased on a dc level such as an amplifier operating on a single supply or the output of a dc PSU DC coupling should be selected when making DC measurements as it prevents noise from resetting the frequency measurement algorithm There are three bandwidth options wide low and DC only Low bandwidth may be useful in noisy applications for example where there are switching spikes superimposed on the waveform of interest Th
47. individual channel W VA VAr W f VA f VAr f W dc and W h are computed as the sum of the individual phase data V rms V mag V pprms and V ppmag are computed as the average of the individual phase data A rms and A mag are computed from sum VA sum V and sum VA f sum V f respectively then may optionally be divided by the number of phases to give the average Sum power factor is computed as sum W sum VA and the fundamental power factor is computed as fundamental sum W fundamental sum VA with the sign derived from the sign of sum VAr When calculating 3 phase 2 wattmeter Sum VA and VAr options are as follows For low distortion signals sum VAr ph1 VAr ph2 VAr sum VA sum W sum VAr For High distortion signals i 3 sum VA gt oh1 VA ph2 VA sum VAr V sum VA sum W 10 7 VIW INTERFACE 1N 3N user manual 10 3 Neutral synthesis In 3 phase 3 wattmeter configuration the values for the neutral current are synthesised from the calibrated values of the three phases By Kirchoff s law the sum of the instantaneous currents flowing into a node must be zero By convention neutral current is regarded as flowing out of the load so the neutral current can be derived from the sum of the three phase currents In 3 phase 2 wattmeter configuration the neutral current values are synthesised from the 2 phase currents and represent the third phase current Values available are rms
48. into RAM may be subsequently transferred to non volatile memory using the PROG menu In this mode the data may be viewed in real time as it is being acquired For high speed data acquisition the datalog interval may be set to zero so that each measurement is stored The measurement interval is controlled with the speed option in the ACQU menu Using the window option for speed allows greater control of the measurement interval In this mode the display flashes DATALOG RUNNING and only shows the acquisition time The minimum datalog interval depends on the function but is typically 10ms Note that in all cases the measurement interval is necessarily adjusted to be an integral number of cycles of the measured waveform 8 13 VIW INTERFACE 1N 3N user manual Press DATALOG to set up the datalog options The datalog is started with the START key and stopped with the STOP key unless the store becomes full first The zero reference for the elapsed time is taken as the first data measurement after START The data can be viewed as a table or as individual graphs Pressing GRAPH steps the graph through the stored parameters If more than 250 records have been stored the graph can show the data for the whole period or pressing ZOOM redraws the graph to show 250 records about the cursor The cursor can be moved in single steps LEFT or RIGHT or large steps UP or DOWN Pressing UNZOOM shows the whole data gain Movements of
49. is pin should be driven or connected to pin 4 To connect VIW INTERFACE to a PC use a 9 pin female to 9 pin female null modem cable 1 amp 6 4 2 3 3 2 4 3 1 amp 6 5 5 7 8 8 7 6 6 VIW INTERFACE 1N 3N user manual 6 4 RS232 printer The RS232 port can also be connected to a serial printer for making a hard copy of any screen When printing is enabled in the REMOTE menu then pressing START will commence a screen dump to the printer The graphic protocol used is the ESC P so any printer which supports this protocol should work such as the Seiko DPU 414 The other communication options USB LAN or GPIB can still be used while the RS232 printer is enabled 6 7 VIW INTERFACE 1N 3N user manual 7 System options Press SYS to access the system options Measurements of phase can be expressed in one of three conventional formats 180 to 180 commonly used in circuit analysis 0 to 360 commonly used in power applications O to 360 The measurement is exactly the same it is only the way that it is expressed that changes Blanking can be applied to a number of measurements so that zero is shown when the measurement is below a certain level This blanking can be disabled if desired The oscilloscope display and datalog graph may be made up of single points or lines Each key press is normally accompanied by an audible beep as well as the tactile click The beep can be disable
50. l representative It is recommended that the instrument be re calibrated annually VIW INTERFACE 1N 3N user manual ABOUT THIS MANUAL This manual describes the general features usage and specifications of the mono phase 1N and three phase 3N range of power analysers VIW INTERFACE Detailed descriptions of the communications command set for RS232 USB LAN and GPIB is given in the separate manual VIW INTERFACE 1N 3N communications manual Firmware revision 1 100 This manual is copyright 2015 Elettrotest Spa and all rights are reserved No part may be copied or reproduced in any form without prior written consent 26 May 2015 E Ul VIW INTERFACE 1N 3N user manual CONTENTS Introduction general principles of operation 1 1 Getting started Aare 2 1 2 1 Unpacking ei 2 1 Q ick Start guid naaa 3 1 3 1 Operating Mode KeyS cccscccesseeeeseeseeeeseeeeeeetnanenes 3 1 3 2 Menu Control Keys Arsen 3 3 3 3 Display Control Keys asii oi 3 4 3 4 Setup Keys Keypad cccccesceeesceeeeseeseeeeseeeneeeenaseres 3 6 3 5 Control KEYS ias aia 3 8 3 6 Scope Mode vsti ii A a ADAAN 3 9 3 7 Data Entry Guide ontario 3 11 Using the menls aria cra 4 1 4 1 selection froma larisa 4 3 4 2 Numeric data COVA 4 4 4 3 TEX BER TEN toria 4 5 Special TUACHON Sacado 5 1 5 1 Display ZOO Micra 5 1 5 2 PROG non volatile memory store and recall 5 2 5 3 Zero COMPENSALION usa 5 4 5 4 ALARM alarm functio
51. lesine RO Italy We declare that the product Description Power Analyser Product name VIW INTERFACE Model 1N 3N conforms to the requirements of Council Directives 2004 108 EC relating to electromagnetic compatibility EN 61326 1 2013 01 Class A 2006 95 EC relating to safety of laboratory equipment EN 61010 1 2010 10 April 2015 Elettrotest Spa roo ur VIW INTERFACE 1N 3N user manual WARRANTY This product is guaranteed to be free from defects in materials and workmanship for a period of 24 months from the date of purchase In the unlikely event of any problem within this guarantee period first contact Elettrotest Spa or your local representative to give a description of the problem Please have as much relevant information to hand as possible particularly the serial number and release numbers press SYSTEM then LEFT If the problem cannot be resolved directly then you will be given an RMA number and asked to return the unit The unit will be repaired or replaced at the sole discretion of Elettrotest Spa This guarantee is limited to the cost of the instrument itself and does not extend to any consequential damage or losses whatsoever including but not limited to any loss of earnings arising from a failure of the product or software In the event of any problem with the instrument outside of the guarantee period Elettrotest Spa offers a full repair and re calibration service contact your loca
52. lysis frequency of the DFT measurement is continually adjusted to give optimum measurement of the fundamental and harmonics The response of the tracking algorithm can be adjusted to suit the ballast being measured Fixed time no adjustment Fast Medium Slow To select lighting ballast mode press the APP key select the mode with the cursor keys move down to the default settings option and press ENTER The defaults are loaded and the particularly important parameters can then be changed 9 2 VIW INTERFACE 1N 3N user manual 9 3 Inrush current Measurement of inrush current surge requires very fast sampling to catch the highest instantaneous value Measurements must be made under conditions of manual ranging and with the voltage applied to the instrument Then when the load is switched on the highest peak value can be detected In inrush mode VIW INTERFACE samples and analyses every sample at the full sample rate in excess of 2Msamples s to catch even very fast peaks For the worst case inrush current the input to the device under test must be switched on at the worst point in the cycle 90 or 270 for a capacitive load 0 or 180 for an inductive load The Phase Controlled Inrush Switch or PCIS available as an accessory for VIW INTERFACE controls the switch on of the power to the DUT from 0 to 315 in steps of 45 from the VIW INTERFACE front panel ENTERing the default settings in inrush mode in the ap
53. manual 5 3 Zero compensation There are 2 levels of zero compensation Trim out the dc offset in the input amplifier chain Measure any remaining offset and compensate The trim of the dc offset in the input amplifier chain can be manually invoked with the ZERO key or over the RS232 with the REZERO command This dc offset trim measures the dc present while the autozero switch is active and applies an equal and opposite offset via a D A converter so that the input range to the A D is optimised The measurement of the remaining offset also happens when the offset is trimmed but is also repeated at regular intervals This is to compensate for any thermal drift in the amplifier chain The remaining DC offset is precisely measured and stored so that the measurements can be compensated by an appropriate algorithm in the instrument firmware Real time measurement is not possible while the autozero measurement is in progress so this repeated autozero function can be disabled via the SYSTEM OPTIONS menu 5 4 VIW INTERFACE 1N 3N user manual 5 4 ALARM alarm function VIW INTERFACE has 2 independent alarms that can be used to generate an audible warning sound the alarm if the value exceeds a threshold sound the alarm if the value is below a threshold sound the alarm if the value is outside a window sound the alarm if the value is inside a window The values to which the alarms are applied can be any of the measurements selected for
54. manually particularly when looking for a single event in single shot 19 2 VIW INTERFACE 1N 3N user manual mode Manual ranging is essential for rare events with a low mark space ratio 15 3 VIW INTERFACE 1N 3N user manual 16 Phase meter The phase meter mode is a secondary function which does not have a separate button It is selected by stepping through the operating mode via the MODE menu The phase meter uses the terminology of channel 1 for voltage and channel 2 for current as it is normal to use a phase meter to compare voltages directly In this case the current input is set to external attenuator in the RANGE menu and a voltage probe oscilloscope probe can be used For optimum phase accuracy the same type of voltage probe should be used for the voltage input which can also be set to external attenuator in the RANGE menu Remember to trim the oscilloscope probes if necessary by connecting them to a 1kHz square wave and adjusting them for 33 3 3 harmonic in the harmonic analyser mode The phase meter measures the phase and gain of channel 2 relative to channel 1 using a discrete Fourier transform DFT algorithm at the fundamental frequency Relative gain is given as an absolute value and in dB The ratio can be inverted to give the gain of channel 1 relative to channel 2 To look at differences in gain from a nominal value an offset gain can be applied either manually or by pressing ZERO offset gain
55. measured dB offset dB 16 1 VIW INTERFACE 1N 3N user manual 17 Specifications Frequency Range DC and 10mHz to 2MHz DC and 10mHz to 1MHz 50Arms version Voltage Input Ranges 1Vpk to 3000Vpk 1000Vrms in 8 ranges 20 over range ability maintains 300Vpk range with 240Vrms Accuracy 0 04 Rdg 0 04 Rng 0 004 x kHz 1mV External sensor input to 3Vpk BNC connector Current Input The standard VIW INTERFACE is fitted with a 30Arms internal shunt 10Arms or 50Arms internal shunts are available as an option 30Arms Shunt Ranges 100mApk to 300Apk 30Arms in 8 ranges Accuracy 0 04 Rdg 0 04 Rng 0 004 x kHz 100uA 10Arms Shunt Ranges 10mApk to 30Apk 10Arms in 8 ranges Accuracy 0 04 Rdg 0 04 Rng 0 004 x kHz 10uA 50Arms Shunt Ranges 300mApk to 1000Apk 50Arms in 8 ranges Accuracy 0 04 Rdg 0 04 Rng 0 004 x kHz 100uA External shunt input to 3Vpk BNC connector Phase Accuracy 5 millidegrees 10 millidegrees x kHz 10 millidegrees 20 millidegrees x kHz 50Arms shunt Watts Accuracy 0 05 0 03 pf 0 01 x kHz pf Rdg 0 05 VA Rng DC Accuracy Voltage 0 1 Rdg 0 1 Rng 10mV or 10uV external Current 0 1 Rdg 0 1 Rng 1mA or 10uV external 17 1 VIW INTERFACE 1N 3N user manual Total Harmonic distortion THD Accuracy 1 THD THDE did a hi gt ti hi error Voltage hi error Voltage 0 04 hi rdg 0 04 rn
56. measuring surge either set the range to manual or repeat the test several times with ranging set to up only To reset the maximum press TRIGGER The mean value also known as rectified mean is computed by the arithmetic mean of the absolute value of the samples 21 mean 1 21 Iv 9 do 0 For a sampled signal the formula becomes i n i mean 1 n gt Iv i i 0 12 1 VIW INTERFACE 1N 3N user manual where n is the number of samples for an integral number of complete cycles of the input waveform Note that the mean value will not give the same measurement as rms The form factor indicates the ratio of mean to rms form factor rms mean For an undistorted sinewave the form factor is given by n 2v2 1 11072 sine wave form factor 12 2 VIW INTERFACE 1N 3N user manual 13 Harmonic analyser The HARM mode of VIW INTERFACE computes multiple DFTs on the input waveforms in real time There are two modes of operation difference THD and series harmonics Series harmonic mode includes options for THD TIF THF TRD TDD and phase In difference THD mode the THD Total Harmonic Distortion is computed from the rms and fundamental THD 1 h V rms2 h 2 In series THD mode the THD is computed from a series of up to 100 harmonics i n THD 1 h V 2 hi2 where hj is the i harmonic i 2 TIF Telephone Influence Factor is similar to THD but each harmonic has a weighting factor
57. n nessssenennn nenn nenn nennen nennen 5 5 5 5 Data no ld Aa 5 7 5 6 Master slave Operation ccccccccceeseceeeesaeeeeesaeeeneaaes 5 8 Using remote control an 6 1 6 1 Standard event status register 6 4 6 2 Serial Poll Status byte AS 6 5 6 3 RS232 COnNneECION Sci 6 6 6 4 RS232 Printer 6 7 System Options a a 7 1 7 1 A O iensen iee ireren enina aak iaria 7 3 Measurement OPINAS iia adan 8 1 8 1 WIANA CONIGQUEAION are 8 1 8 2 ACQU Acquisition OPTIONS ococcccccoccnoncnnnnoncnnn rra 8 5 9 10 11 12 13 14 15 16 O9 007 00 99 pe KO KO VIW INTERFACE 1N 3N user manual 3 COUPLING coupling bandwidth options 8 8 4 RANGE input channel options ccceeeeeeesee een nen 8 10 5 DATALOG datalog options nensseenenennennnn en n nennen 8 13 6 MATHS custom result computation serene 8 15 Application Specific modes 2422sssen nn nenn nn nn nn 9 1 1 PWM motor drive aaa aa 9 1 2 Lighting ballast aa ac a a 9 2 3 TAIANA da 9 3 4 Power transformers ana een 9 4 5 Standby power measurement nesssnenennnnnnnnnnnen nenn nenn 9 5 Power measurements an 10 1 10 1 Individual phase COMPUtALIONS cece eee e eee eee nenn 10 3 10 27 SUM COMPUTATIONS sessir ineine a 10 7 10 3 Neutral synthesis cress essen 10 8 10 4 Phase to phase COMPUTATIONS cee ceee seen ee nennen 10 9 10 5 Mechanical BoWer cuicos 10 11 LOG JEMIGIGACY fesse nein 10 12 Integr
58. ol keys 3 4 VIW INTERFACE 1N 3N user manual e Press ENTER to confirm flashing stops f Continue to select up to a total of 4 values g Press ZOOM once or twice to display emphasized values as desired Diagram below shows top zoom level for Power Analyzer POWER ANALYZER Vrange 3001 Arange 34 coupling ac de bandwidth wide PHi ma 40 453 w me 241 34 yv i a 300 12m a wee 50 004 Hz Realtime Hold Toggles between continuous display readings and holding an instantaneous reading on screen Note measurements continue to be taken even when display is in Hold Table Graph Select tabular or graphical presentation of data as collected in Datalog see SETUP KEYS or in HARMONIC ANALYZER mode 3 5 VIW INTERFACE 1N 3N user manual 3 4 Setup Keys Keypad ACQU COUPLING gt zZ G m 4 5 6 DATALOG APP MATHS 7 8 9 ALARM REMOTE AUX 0 SYS MODE PROG SELECT MENUS for non mode specific configuration Also use as numeric keypad when entering parameter values or data ACQU use for configuring inputs appropriate to source and nature of signals being analyzed Diagram below shows Power Analyzer default setup ACQUISITION CONTROL wiring 3 phase 3 wattmeter speed medium smoothing normal smoothing response auto reset frequency reference voltage frequency reference phase 1 low frequency off advanced options gt
59. olatile memory store and recall There are 3 types of memory which can be saved in non volatile locations Programs Data log Measurement results There are 100 non volatile program locations where the settings for the entire instrument can be saved for recall at a later date Each of the 100 locations has an associated name of up to 20 characters that can be entered by the user to aid identification Program number 1 if not empty is loaded when the instrument is powered on so that VIW INTERFACE can be set to a user defined state whenever it is switched on This is particularly useful to set system options such as phase convention If no settings have been stored in program 1 then the factory default settings are loaded program number 0 Program numbers 1 6 may be recalled with a single press of the function keys if the direct load option is selected in the system menu see system options The instrument can be restored to the factory default settings at any time by recalling program number 0 The program menu is accessed using the PROG key The program location can be selected either by stepping through the program locations in turn to see the name or by entering the program number directly When storing a configuration in a program there will be a short pause of about 1 second if the program location had previously been written or deleted The process will be very quick if the location has not been used 5 2 VIW INT
60. onic analyser parameters mode selected harmonic maximum harmonic harmonic bargraph rated current for TRD D 3 106 107 108 109 110 111 112 113 114 117 118 119 122 123 128 129 132 133 137 138 139 148 150 152 153 154 155 D 4 VIW INTERFACE 1N 3N user manual Oscilloscope parameters timebase trigger level pretrigger trigger polarity trigger type trigger reference trigger phase cursors enable trigger HF reject System parameters step message enable display sequence zoom 2 high resolution Auxiliary parameters fixture control PICS phase PICS cycles Other power parameters integrator run time phase to phase mean LCR meter parameters computation series parallel model phase adjust value Phase meter parameters dB offset ratio selection System parameters RS232 printer enable IEEE address LAN enable COM port recall eeprom program 176 177 178 179 180 182 183 184 185 187 VIW INTERFACE 1N 3N user manual Alarm functions alarm 1 data alarm 1 type alarm 1 high threshold alarm 1 low threshold latching type sounder enable alarm 2 data alarm 2 type alarm 2 high threshold alarm 2 low threshold Input parameters phase 2 enable channel 3 enable channel 4 input range channel 3 input range channel 4 input ranging channel 3 input ranging channel 4 acdc coupling phase 2 bandwidth phase 2 scale factor channel 3 scale factor channel 4 e
61. plication menu selects the PCIS and sets VIW INTERFACE to manual ranging If PCIS is not being used then it can be deselected in the AUX menu Having selected the default settings the current range should be set to an appropriate range for the DUT The oscilloscope mode is also useful for qualitatively evaluating the inrush current 9 3 VIW INTERFACE 1N 3N user manual 9 4 Power transformers Large power transformers operate at very low power factor lt 0 01 and the phase accuracy is critical to measure the losses Power transformer application mode sets the configuration options to the optimum for phase accuracy eg AC DC coupling range lock across phases The multiple phase display is also changed to show imbalance across the phases Phase 1 appears with the normal measurements but the voltage and current measurements for phase 2 and phase 3 are expressed as a percentage of the corresponding values from phase 1 The phase angle measurements are expressed as deviation from the expected values of 120 and 240 The temperature can be monitored at the same time by connecting a suitable temperature sensor to the torque BNC input The input accepts an analogue voltage from 10V to 10V which can be scaled by an offset and a factor in degrees per Volt The offset is entered as the zero degree voltage so for a sensor with an output range of 5 Volt and OV 10 degrees the offset to be entered would be 2V 9 4 VIW IN
62. r manual manual ranging Manual ranging or up only autoranging is essential for low frequency measurements Separately from the current shunt and attenuator value a scaling factor can be entered for each channel In multi phase applications if independent input control has been set see system options then the ranging options may be independently set on each phase Press the RIGHT and LEFT keys to step between the phases 8 12 VIW INTERFACE 1N 3N user manual 8 5 DATALOG datalog options VIW INTERFACE can store and display measurements recorded at regular intervals over a time period Each data record consists of the elapsed time and up to four data values selected by ZOOM More than 8000 records can be stored if one value is selected more than 3000 if four values are selected The actual interval between data points is governed by the measurement speed and the datalog interval VIW INTERFACE stores the next available measurement after the datalog interval has elapsed the actual elapsed time is attached to each datalog record is displayed with the data on the table or each graph and returned with each record over the communications RS232 USB LAN or GPIB The data values may be stored to RAM or directly into non volatile memory as each value becomes available The non volatile option is useful for acquiring data over long periods to prevent the loss of data in the event of a power failure Data that has been stored
63. rce level type polarity HF reject pretrigger The data source for the trigger can be selected to be either voltage or current On a multiphase instrument any of the phases may be selected for the trigger source 15 1 VIW INTERFACE 1N 3N user manual The trigger level is set directly in Volts or Amps and does not change if the range is changed i e it is an absolute trigger level and not relative to the range full scale Pressing NEXT and ENTER adjust the trigger level by a factor of 2 The trigger level is shown as a small horizontal bar on the extreme left hand edge of the display against the appropriate channel If the trigger is set to a value above or below the range of the input channel then a small carat A is shown at the top or inverted at the bottom of the display as appropriate The trigger type may be set to auto trigger if possible but do not wait normal wait indefinitely for trigger single shot wait for trigger then hold The single shot option is reset using the TRIGGER key The trigger polarity may be set to rising edge or falling edge When trigger HF reject is on a low pass filter is applied to the trigger data to stabilise the trace with noisy signals The filter only influences the trigger detection and does not change the data displayed Pretrigger may be set to none 25 50 75 Autoranging can be used with the oscilloscope functions but it is more customary to fix the range
64. record per line index time data one record per line single integer data value single integer data value multiple real data values total efficiency fundamental efficiency B 1 VIW INTERFACE 1N 3N user manual FQLOCK on off FQREF phase channel FREQUE frequency HARMON para h hmax HARMON phase or HARMON phase SERIES or HOLD on off INPUT channel type INTEGR type display INTEGR RUNTIM hours mins INTEGR phase KEYBOA value LCR conditions param head LCR phase LOWFRE on off MODE type MSLAVE type MULTILOG index phase func MULTILOG PFCONV convention PHASEM ratio PHASEM phase PHCONV convention POWER sum A POWER PHASE WATTS POWER PHASE VOLTAGE POWER PHASE CURRENT POWER PH PH POWER RMS POWER VECTORS POWER WVA B 2 freq mag1 mag2 hmag1 hmag2 h1 h2 thd1 thd2 hphasei hphase2 mag X n harmonics mag phase x n harmonics time Wh Wh f VArh VArh f VAh VAh f pf pf f Vav Vav fAh Ah f freq Vmag Amag impedance phase R L C tans Qf reactance 1 30 floats as selected Freq magi mag2 dB phase Freq W W f VA VA f Var Var f pf pf f Wdc W h Freq rms mag dc o peak cf mean ff harmonic Freq rms mag dc o peak cf mean ff harmonic Freq rmsi magi o1 rms2 mag2 02 rms3 mag3 63 Freq vrms1 vdc1 arms1 adc1 vrms2 vdc2 arms2 adc2 vrms3 vdc3 arms3 adc3 Freq magi1 d1 mag2 62 mag3 63 mag4 64 mag5 65 mag6 o6 Freq w1 vrms1 arms1 w2 vrms2 arms2 w3 vrms3 arms3 VIW INTERFACE 1N 3N user m
65. s are measured directly and phase to phase voltages are also computed The wiring configuration is the first item to be selected under the ACQU menu 8 1 1 Wiring diagrams Single Phase 8 2 VIW INTERFACE 1N 3N user manual Two Phase Two Wattmeter HI LO DE Fa oror Maa Three Phase Two Wattmeter Phase Source 8 3 VIW INTERFACE 1N 3N user manual Three Phase Three Wattmeter simulated neutral Phase Source ZN Three Phase Three Wattmeter Phase Lo AA Edge AA 8 4 VIW INTERFACE 1N 3N user manual 8 2 ACQU Acquisition options In normal acquisition mode the window over which the measurements are computed is adjusted to give an integral number of cycles of the input waveform The results from each window are passed through a digital filter equivalent to a first order RC low pass filter There are four pre set speed options fast medium slow and very slow that adjust the nominal size of the window and therefore the update rate and the time constant of the filter Greater stability is obtained at the slower speed at the expense of a slower update rate There is also an option to set a specific size of the window to a value other than the preset options In order to synchronise to an integral number of cycles the window size is either reduced by up to 25 or increased as necessary Note that at low frequencies the window is extended to cover a complete cycle of the
66. s linearly as the value changes between these thresholds When using GPIB communications IEEE488 the instrument can be configured to generate an SRQ on alarm see section on remote control 5 6 VIW INTERFACE 1N 3N user manual 5 5 Data hold When in real time display mode the data on the display can be held at any time by pressing the REAL TIME key When HOLD is activated the word HOLD flashes in the top right hand corner of the display Press the REAL TIME key again or the HOME key or START key to release HOLD in this case HOME and START do not have their normal functions Changing mode also releases hold When HOLD has been activated the DSP continues to sample compute and filter the results but the data is ignored by the CPU When HOLD is released the display is updated with the next available value from the DSP HOLD can also be triggered by a an alarm condition see section 5 4 alarm function 5 7 VIW INTERFACE 1N 3N user manual 5 6 Master slave operation Two instruments can be connected together to make synchronised measurements with up to 6 phases The unit assigned as master controls the measurements so both instruments are taking data in the same time When in POWER or INTG modes the SUM power from the slave instrument is read by the master instrument to compute the overall efficiency To operate in master slave mode connect together the extension ports on the back of the instrument with the
67. sabled when the instrument is set to remote using the IEEE Press HOME to return to local operation RS232 data format is start bit 8 data bits no parity 1 stop bit Flow control is RTS CTS see section 5 2 baud rate is selectable via the REMOTE menu A summary of the available commands is given in the Appendix Details of each command are given in the communications manual Commands are executed in sequence except for two special characters that are immediately obeyed Control T 20 reset interface device clear Control U 21 warm restart 6 3 VIW INTERFACE 1N 3N user manual 6 1 Standard event status register PON CME EXE DDE QYE OPC bit O OPC operation complete cleared by most commands set when data available bit 2 QYE unterminated query error set if no message ready when data read bit 3 DDE device dependent error set when the instrument has an error bit 4 EXE execution error set when the command cannot be executed bit 5 CME command interpretation error set when a command has not been recognised bit 7 PON power on event set when power first applied or unit has reset The bits in the standard event status register except for OPC are set by the relevant event and cleared by specific command ESR CLS RST OPC is also cleared by most commands that change any part of the configuration of the instrument such as MODE or START 6 4 VI
68. ssage can be personalised see the User Data section under System Options It may be necessary to adjust the contrast of the LCD display Press the MODE key then adjust the contrast with the right and left cursor keys The contrast setting will be 2 1 VIW INTERFACE 1N 3N user manual stored in non volatile memory so that it is remembered each time that the instrument is turned on After pressing the MODE key pressing DELETE will reset the contrast to a factory set midpoint Allow 30 minutes warm up time before commencing any measurements in order to ensure accurate results The voltage and current leads may now be connected to a circuit under test The high CMRR of the instrument allows the current channel to be connected in the live path high side shunt instead of the neutral path low side The test leads supplied meet the safety requirements of EN61010 1 2010 10 to an operating voltage of up to 1000V rms cat II or 600V rms cat III The Quick Start guide Section 3 below gives an introduction to the operating modes of the VIW INTERFACE and the selection of options and parameters The Quick Start guide may be followed with no inputs connected to the VIW INTERFACE In the event of any problem with this procedure please contact customer services at Elettrotest Spa or your local authorised representative contact addresses and telephone numbers are given in the appendix at the back of this manual 2 2 VIW INTERFACE
69. t display contrast Use ENTER or HOME to return to readout display FOR TEXT ENTRY see DATA ENTRY GUIDE 3 2 VIW INTERFACE 1N 3N user manual 3 2 Menu Control Keys A HOME ESC DELETE z ENTER BACK NEXT ENTER NEXT confirms your selection or parameter value data entry HOME ESC returns to the original entry or to your previous action DELETE BACK removes a previous selection or value or returns to your previous action ARROW KEYS Up Down L R to move around menu options make incremental decremental changes etc Also to position cursors in SCOPE mode 3 3 VIW INTERFACE 1N 3N user manual 3 3 Display Control Keys ZOOM ZOOM REALTIME TABLE GRAPH OOOO KO HOLD __ Display Zoom Up to 4 displayed values may be emphasized a Return to no zoom by pressing ZOOM press twice from top zoom level b Press ZOOM to view presently selected data Diagram below shows Power Analyzer default selection this time with a load connected POWER ANALYZER Frange 3001 Arange 34 coupling ac de bandwidth wide P H 1 total fundamental watts 40 453 W 41 3554 vA 72 430VA 42 5944 Mar 50 08044r 11 75 Ar pt 0 559 0962 voltage 241 34V 241 241 current 300 12mA4 178 24md frequency 50 OO4Hz H3 286 23mlJ de watts 195 17 pla c Press DELETE to clear that selection d Move the flashing box to the desired data to be emphasized using the Up Down L and R menu contr
70. tage input using the touchproof BNC cable supplied They are powered either by an ac ac mains adaptor or a dedicated 12V dc supply Part numbers ULCP Ultra Low Capacitance Probe A 4 VIW INTERFACE 1N 3N user manual External input attenuator The VIW INTERFACE voltage inputs have a 3V peak external input for use with probes or attenuators A divide by 10 or divide by 20 passive attenuator with a bandwidth of dc 30MHz 1dB is available to extend the 3V peak input to 30V and 60V respectively The low frequency accuracy is 0 3 max The attenuators have a short flying lead to connect to the external BNC of the instrument Part numbers ATT10 divide by 10 attenuator ATT20 divide by 20 attenuator A 5 VIW INTERFACE 1N 3N user manual CommVIEW PC software CommVIEW is a self contained software program for a PC which facilitates communication with VIW INTERFACE over RS232 USB or LAN CommVIEW allows strings to be sent and received between a PC and VIW INTERFACE The strings can be viewed in a window and optionally stored in a file Data received from VIW INTERFACE may be displayed in normal scientific notation with an identifying label Strings to be sent to VIW INTERFACE can be stored in a script file and executed automatically The script file is created with any text editor and includes three types of lines interpreted by the first character on each line lines beginning with are sent to V
71. the cursor are synchronised in both the TABLE and GRAPH views 8 14 VIW INTERFACE 1N 3N user manual 8 6 MATHS custom result computation Non standard results may be computed from a combination of voltage and current parameters signals on the torque and speed inputs and constants There are 3 formulae each combining up to 4 terms 1 termi term2 term3 term4 2 termi term2 x term3 term4 3 term1 x term2 term3 term4 Each term comprises a result scaled by a signed factor or a signed constant For example consider the formula maths Vpk Apk V2 Select formula 2 with termi voltage peak x 1 0 term2 disabled term3 current peak x 1 0 term4 constant x 1 414 or termi voltage peak x 1 0 term2 disabled term3 current peak x 0 7071 term4 disabled The selected formula is applied to the data from each phase The result is displayed with a user definable label of up to 12 characters and units up to 8 characters 8 15 VIW INTERFACE 1N 3N user manual 9 Application specific modes Select the application specific options form the APP menu 9 1 PWM motor drive The nature of the waveforms in a PWM motor drive application makes measurement of the fundamental frequency difficult The application mode for PWM motor drives applies a selectable filter to the data being used for the frequency measurement The best filter to use for a given application should be selected by experiment The
72. with a 5 digit mantissa by default For extra resolution this can be increased to 6 digit by setting resolution to high in the REMOTE menu There is also an option for higher speed data transfer by selecting resolution binary where each value is returned in 4 bytes each of which has the msb set so that it will not be interpreted as an ASCII character byte 1 2 s complement signed exponent byte 2 bit 6 mantissa sign bit 5 0 mantissa bits 19 14 byte 3 mantissa bits 13 7 byte 4 mantissa bits 6 0 When the msbs are stripped off and the bytes put together there is 6 bit signed exponent a mantissa sign bit and a 20 bit mantissa magnitude The value then is given by Value 2 exponent x mantissa 2720 VIW INTERFACE maintains an error status byte consistent with the requirements of the IEEE488 2 protocol called the standard event status register that can be read by the mandatory command ESR see section 5 1 VIW INTERFACE also maintains a status byte consistent with the requirements of the IEEE488 2 protocol that can be read either with the IEEE488 serial poll function or by the mandatory command STB over RS232 or USB or IEEE or LAN see section 5 2 6 2 VIW INTERFACE 1N 3N user manual The IEEE address defaults to 23 and can be changed via the REMOTE menu The LAN IP address defaults to auto assigned DHCP but can be set manually by the REMOTE menu The keyboard is di
73. xternal shunt channel 3 external shunt channel 4 Input parameters phase 3 enable channel 5 enable channel 6 input range channel 5 input range channel 6 input ranging channel 5 input ranging channel 6 acdc coupling phase 3 bandwidth phase 3 scale factor channel 5 scale factor channel 6 external shunt channel 5 external shunt channel 6 D 5 VIW INTERFACE 1N 3N user manual Appendix E Contact details Please direct all queries or comments regarding the VIW INTERFACE instrument or manual to Elettrotest Spa P zza R Riello 20 B 45021 Badia Polesine RO Italy Tel 39 0425 53567 Fax 39 0425 53568 E mail address info elettrotestspa it commerciale elettrotestspa it tecnico elettrotestspa it web site www elettrotestspa com At Elettrotest Spa we have a policy of continuous product improvement and are always keen to hear comments whether favourable or unfavourable from users of our products An example comment form can be found at the end of this manual if you have any comments or observations on the product please fill a copy of this form with as much detail as possible then fax or post it to us Alternatively send an e mail with your comments E 1 VIW INTERFACE 1N 3N comments serial main release number dsp release fpga release boot release press SYS then LEFT date your contact details comments detailed description of application or circumstances
74. zoom The alarm status is also available as a logic output via the communications The first alarm also has option to generate a variable sound changing linearly as the value changes between two thresholds To program an alarm first select the functions for the zoom up to four measurements can be selected for the display the alarm is applied to any of them then press ALARM to invoke the alarm menu select which of the zoom functions is to be used select the type of alarm set the upper limit if appropriate set the lower limit if appropriate select whether the alarm is to be latched select whether the alarm sounder is enabled If the alarm latch is selected then both alarms will continue to sound even if the value returns to within the normal boundaries To clear the alarm press HOME The alarm latch can also be set to HOLD the data so that an event can be captured The data on the screen will be the measurement that first triggered the alarm condition 5 5 VIW INTERFACE 1N 3N user manual The SYNC output can be used to trigger a PLC or ATE system on alarm The SYNC output will be logic high when the instrument is in an alarm condition and logic low if not The linear alarm option allows tests to be carried out even if it is not possible to see the display Pressing ZERO in the alarm menu sets the upper and lower threshold to 4 3 and 1 3 of the measured value respectively The repetition rate of the sounder then varie

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