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2-41

IM WT310-02EN

Making Preparations for Measurements

1

2

3

4

5

6

7

App

Index

Connecting to the WT332/WT333

In the wiring examples that follow, the WT332/WT333 input elements, voltage input terminals, and 
current input terminals are simplified as shown in the following figure.

 

VOLTAGE

±

±

CURRENT

EXT

Input element

C

±

V

±

Voltage input 

terminals

Current input 

terminals

WT332/WT333

Also, the wiring examples are for when a CT is connected. When connecting a pass-through CT or a 
clamp-type current sensor that outputs current, substitute the CT with the pass-through CT or clamp-
type current sensor.

 

Clamp-type current 

sensor that outputs 

current

C

±

± V

L CT

C

±

± V

Input element

Input element

Pass-through CT

C

±

± V

Input element

2.11  Wiring the Circuit under Measurement When Using a Voltage or Current Transformer

Содержание WT332

Страница 1: ...User s Manual WT310 WT310HC WT332 WT333 Digital Power Meter Getting Started Guide IM WT310 02EN 3rd Edition...

Страница 2: ...sing YOKOGAWA products YOKOGAWA provides registered users with a variety of information and services Please allow us to serve you best by completing the product registration form accessible from our w...

Страница 3: ...in the manual numbers are the language codes Contact information of Yokogawa offices worldwide is provided on the following sheet Document No Description PIM 113 01Z2 List of worldwide contacts Notes...

Страница 4: ...er cord1 D UL CSA Standard power cord Part No A1006WD Maximum rated voltage 125 V F VDE Standard power cord Part No A1009WD Maximum rated voltage 250 V Q BS Standard power cord Part No A1054WD Maximum...

Страница 5: ...is included 1 GB Standard A1064WD H NBR Standard A1088WD N Printed manuals Manual CD 1 Make sure that the attached power cord meets the designated standards of the country and area that you are using...

Страница 6: ...apanese The PDFs of the Japanese user s manuals are also included on the CD Installer for the WTViewerFreePlus Application Software For the WT300 Series WTViewerFreePlus_Installer exe WTViewerFreePlus...

Страница 7: ...1 758931 1 Two pieces in one set Rated voltage 1000 V 12 Alligator clip adapter set 758922 1 Two pieces in one set For use with measurement lead 758917 Rated voltage 300 V 1 758929 1 Two pieces in on...

Страница 8: ...nt that can measure parameters such as voltage current and power Do not use this instrument for anything other than its intended purpose The following symbols are used on this instrument Warning handl...

Страница 9: ...a properly grounded three prong outlet Do Not Impair the Protective Grounding Never cut off the internal or external protective earth wire or disconnect the wiring of the protective earth terminal Doi...

Страница 10: ...ables are connected firmly to the current input terminals There are no problems with the current input terminals and the crimping terminals such as the presence of foreign substances During measuremen...

Страница 11: ...products in the EU contact your local Yokogawa Europe B V office Do not dispose in domestic household waste EU Battery Directive EU Battery Directive This directive is valid only in the EU Batteries...

Страница 12: ...l the symbol is used in conjunction with the word WARNING or CAUTION WARNING Calls attention to actions or conditions that could cause serious or fatal injury to the user and precautions that can be t...

Страница 13: ...and then press SETUP UTILITY A menu appears in display B 2 Use or to select StorE Pressing either key cycles through 9 menu items 3 Press SET to confirm the selection of StorE The StorE function menu...

Страница 14: ...ions Perform key operations Initialize settings User s Manual Chapter 2 Set the Measurement Conditions Measurement conditions User s Manual Section 4 1 Section 4 2 Section 4 3 Section 4 4 Section 4 5...

Страница 15: ...asuring a Single phase Device 2 14 2 8 Guide for Selecting the Method Used to Measure the Power 2 15 2 9 Wiring the Circuit under Measurement for Direct Input 2 16 2 10 Wiring the Circuit under Measur...

Страница 16: ...7 5 7 4 Functions 7 9 7 5 External Current Sensor Input EX1 and EX2 options 7 14 7 6 D A Output DA4 DA12 Options 7 14 7 7 Remote Control Input Output Signal DA4 DA12 Options 7 15 7 8 GP IB Interface...

Страница 17: ...e Communication Interface User s Manual External I O connector For connecting D A output and remote control cables chapter 5 For connecting voltage measurement cables sections 2 8 to 2 11 Voltage inpu...

Страница 18: ...1 2 IM WT310 02EN Top Panel Vent holes section 2 2 Inlet holes section 2 2 There are also inlet holes on the bottom panel 1 1 Front Panel Rear Panel and Top Panel...

Страница 19: ...ion Interface User s Manual External I O connector For connecting D A output and remote control cables chapter 5 For connecting voltage measurement cables sections 2 8 to 2 11 Voltage input terminals...

Страница 20: ...1 4 IM WT310 02EN Top Panel Vent holes section 2 2 Inlet holes section 2 2 There are also inlet holes on the bottom panel 1 1 Front Panel Rear Panel and Top Panel...

Страница 21: ...INE Lights when the line filter is enabled Frequency filter indicator FILTER FREQ Lights when the frequency filter is enabled Storage indicator STORE When you start storage this indicator blinks at th...

Страница 22: ...or FILTER FREQ Lights when the frequency filter is enabled Storage indicator STORE When you start storage this indicator blinks at the pace at which storage is taking place Remote indicator REMOTE Lig...

Страница 23: ...strument uses a 7 segment LED display numbers letters and mathematical symbols are displayed using special characters in the manner shown below Some of the characters shown below are not used by this...

Страница 24: ...de VOLTAGE Key Displays the voltage range setting menu The AUTO indicator lights when the range is set to AUTO CURRENT Key Displays the current range setting menu The AUTO indicator lights when the ra...

Страница 25: ...eld press SINGLE to measure data only once at the set data update interval and then update and hold the displayed values General Purpose Keys and Keys Select features and set values SHIFT Key Moves th...

Страница 26: ...ime SHIFT STOP Key RESET Resets the integrated value and the elapsed integration time Communication Interface INTERFACE Key Displays the communication interface setting menu and connection information...

Страница 27: ...D A output settings SHIFT SAVE LOAD HARMONICS Key Displays a setting menu for turning the harmonic measurement display on and off setting the PLL source etc SHIFT Key When you press the SHIFT key once...

Страница 28: ...llow Greater than 130 of the rated range and not more than 140 condition for raising the auto range 2 Cyan 30 or less of the rated range condition for reducing the auto range If the range is already a...

Страница 29: ...02EN Component Names and Functions 1 2 3 4 5 6 7 App Index Error Displayed in cases such as when a measured value is outside of its determined range 1 5 Auto Range Overrange and Error Indications Duri...

Страница 30: ...ternal memory Numeric data storage Recorder Numeric data Setup parameters PC Printer Integration start Integration stop Hold single USB interface GP IB interface RS 232 interface Ethernet interface op...

Страница 31: ...earest YOKOGAWA dealer Do Not Damage the Power Cord Nothing should be placed on top of the power cord The power cord should also be kept away from any heat sources When removing the plug from the powe...

Страница 32: ...the following figure or use both hands to hold the instrument firmly WT310 WT310HC WT332 WT333 When Cleaning the Instrument When cleaning the case or the operation panel turn off the circuit under me...

Страница 33: ...temperature 5 to 40 C Ambient humidity 20 to 80 RH No condensation Do Not Install the Instrument in the Following Places Outdoors In direct sunlight or near heat sources Where the instrument is expos...

Страница 34: ...To rotate the handle first pull the handle s rotary axis out approximately 2 mm to 3 mm on both the left and right sides of the instrument and then rotate it slowly to one of its stop positions 1 2 3...

Страница 35: ...ove the handle from the instrument WT310 WT310HC Rotate the handle to position 8 see the figure on the previous page and then pull out the rotating base of the handle by approximately 10 mm on both si...

Страница 36: ...ble and you cannot ground the instrument do not use the instrument Connecting the Power Cord 1 Check that the instrument s power switch is off 2 Connect the power cord plug to the power inlet on the r...

Страница 37: ...seconds before you turn it on again When the Power on Operation Does Not Finish Normally If the instrument does not operate as described above when the power switch is turned on turn the power switch...

Страница 38: ...attery When the lithium battery voltage falls below a specified value you will no longer be able to store setup parameters and error code 901 will appear on the screen when you turn on the power see s...

Страница 39: ...terminals are electrically connected inside the instrument When connecting a measurement cable from an external current sensor to an external current sensor input terminal remove the cables connected...

Страница 40: ...A whichever is less WT310 When the crest factor is 3 5 mA to 200 mA When the crest factor is 6 2 5 mA to 100 mA Peak value of 150 A or rms value of 100 A whichever is less WT310HC When the crest fact...

Страница 41: ...r greater Attaching a measurement cable to this product may cause radio interference in which case the user will be required to correct the interference Note If you are measuring large currents or vol...

Страница 42: ...covering from the end of the cable and pass the cable through the internal insulator Cable Internal insulator Attachable cable Covering max diameter 3 9 mm Core wire max diameter 1 8 mm 10 mm 2 Insert...

Страница 43: ...s Wiring to a Current Input Terminal Use the clamp on probes sold separately as shown below 96030 96031 96001 voltage output type 751552 current output type 758917 758921 758924 Current under measurem...

Страница 44: ...tray capacitance on measurement accuracy by connecting the instrument s current input terminal to the side that is closest to the earth potential of the power supply SOURCE SOURCE LOAD U I C V LOAD U...

Страница 45: ...ing Direct input is not possible section 2 11 Direct input Voltage transformer VT Current Measurement Methods When the Voltage Is 600 V or Less When the Current Is 20 A or Less When the Current Exceed...

Страница 46: ...n tighten firmly with the terminal knob 3 1 2 1 6 7 Unit mm Current input terminals Current input terminals WT310 WT310HC WT332 WT333 WARNING When the voltage of the circuit under measurement is being...

Страница 47: ...o insert the new stopper into the terminal base and hold it in place Hold the stopper with tweezers and insert it into the terminal base Wrap adhesive tape around a flathead screwdriver so that the ad...

Страница 48: ...minal C CURRENT terminal CAUTION The thick lines on the wiring diagrams are the parts where the current flows Use wires that are suitable for the current levels Wiring Patterns When you are wiring a s...

Страница 49: ...erally it is easier to follow the wiring diagram if you wire to the current input terminals first and then to the voltage input terminals In this example as well we will wire to the WT310 current inpu...

Страница 50: ...nals C CURRENT terminal Round crimped terminal Power supply DUT The wiring for current measurement is complete SOURCE LOAD I C Wiring to the Voltage Input Terminals Connect the voltage input terminals...

Страница 51: ...er Red Black 5 Connect the safety terminal adapters to the WT310 voltage input terminals Red adapter Connect to the VOLTAGE voltage input terminal Black adapter Connect to the voltage input terminal P...

Страница 52: ...ct to the circuit under measurement by placing a terminal block near the WT310 and connecting the power cables and voltage measurement cables to the terminal block Terminal block 2 9 Wiring the Circui...

Страница 53: ...CURRENT terminal WT332 WT333 Note The thick lines on the wiring diagrams are the parts where the current flows Use wires that are suitable for the current levels Wiring Examples of Single Phase Two Wi...

Страница 54: ...input elements 1 and 3 Measure the line voltage using S phase power as the reference SOURCE LOAD I1 C I3 C U1 V U3 V R S T SOURCE LOAD Element 1 V1 A1 R S T Element 3 V3 A3 C V C V Wiring Example of a...

Страница 55: ...nput elements 1 2 and 3 SOURCE LOAD I1 C I3 C U1 V U3 V R N S T SOURCE Element 1 V1 A1 R S T Element 2 V2 A2 LOAD Element 3 V3 A3 U2 V I2 C C V C V C V Note For details about the relationship between...

Страница 56: ...hase two wire DUT on page 2 19 is a useful reference for thinking about the voltage of each phase and the current wiring Order of Connection Generally it is easier to follow the wiring diagram if you...

Страница 57: ...e cables to terminals C and with the wrong polarities T S R C Current input terminals C CURRENT terminal R T 1 3 R S T Power supply DUT The wiring for current measurement is complete T S R SOURCE LOAD...

Страница 58: ...ngth for the voltage of the circuit under measurement Of a size to which the 758931 Safety Terminal Adapter can be attached Covering max diameter 3 9 mm Core wire max diameter 1 8 mm T S R Voltage mea...

Страница 59: ...ers Connect to the voltage input terminals of elements 1 and 3 Pay attention to the terminal polarities so that you don t attach the cables to terminals VOLTAGE and with the wrong polarities T S R V V...

Страница 60: ...wire system Wiring to the Current Input Terminals In the aforementioned steps 1 and 2 connect the current input terminals of element 2 to the S phase power cable Wiring to the Voltage Input Terminals...

Страница 61: ...minals Voltage Input Terminals The terminals are safety banana jacks female that are 4 mm in diameter Only insert a safety terminal whose conductive parts are not exposed into a voltage input terminal...

Страница 62: ...sensor cable Connect the shielded wire of the external current sensor cable to the L side of the shunt output terminal OUT Minimize the area of the space between the wires connecting the current sens...

Страница 63: ...large In this case use an isolation sensor CT DC CT or clamp to perform measurements Clamp type current sensor External current sensor input terminal LOAD V Voltage input terminals WT300 series Connec...

Страница 64: ...to connect to the WT310 WT310HC SOURCE LOAD Earth side OUT L OUT H Shunt type current sensor SOURCE LOAD Earth side Clamp type current sensor that outputs voltage C V EXT C V EXT When You Are Using a...

Страница 65: ...nt sensor that outputs voltage substitute the shunt type current sensor with the clamp type current sensor Shunt type current sensor I OUT L OUT H Input element Input element Clamp type current sensor...

Страница 66: ...ng is connected to input elements 1 and 3 Measure the line voltage using S phase power as the reference SOURCE LOAD R S T OUT L OUT H OUT L OUT H Element 3 Element 1 EXT EXT C V C V Wiring Example of...

Страница 67: ...iring is connected to input elements 1 2 and 3 SOURCE LOAD R S T OUT L OUT H OUT L OUT H Element 3 Element 1 Element 2 OUT L OUT H EXT EXT EXT C V C V C V Note For details about the relationship betwe...

Страница 68: ...hose conductive parts are not exposed into a voltage input terminal If you are using the included 758931 Safety Terminal Adapter see section 2 6 Current Input Terminals The terminals are binding posts...

Страница 69: ...of the VT or CT affect the measured data For safety reasons the common terminals of the secondary side of the VT and CT are grounded in the wiring diagrams in this section However the necessity of gr...

Страница 70: ...als Wiring Example The following figures show how to connect to the WT310 WT310HC SOURCE LOAD L CT VT V v SOURCE LOAD VT V v C V Pass through CT C V VT and pass through CT VT and CT SOURCE LOAD VT V v...

Страница 71: ...put element C V Voltage input terminals Current input terminals WT332 WT333 Also the wiring examples are for when a CT is connected When connecting a pass through CT or a clamp type current sensor tha...

Страница 72: ...lement 1 Element 1 C V C V Wiring Example of a Single Phase Three Wire System 1P3W with VTs and CTs The wiring is connected to input elements 1 and 3 SOURCE L CT VT V v LOAD L CT VT V v N Element 1 El...

Страница 73: ...V Wiring Example With the Three Voltage Three Current Method 3V3A and VTs and CTs Model Applies to the WT333 The wiring is connected to input elements 1 2 and 3 SOURCE LOAD S T R L CT VT V v L CT VT V...

Страница 74: ...ommunication control programs WT310 WT310HC WT332 WT333 PC monitor Saved data Setting changes The WT300 series can be connected to a PC using the following communication interfaces USB GP IB RS 232 Et...

Страница 75: ...instructions on the screen to install the software The following two items will be installed one after the other WTViewerFreePlus YKMUSB USB driver 6 On Windows Vista or Windows 7 the User Account Co...

Страница 76: ...rFreePlus User s Manual IM 760121 02E Example of a Window for Configuring the WT300 series You can change the WT300 series settings from a PC Example of a Window Showing the Measured Data of the WT300...

Страница 77: ...twice The first time is for the positive measurements and the second time is for the negative measurements MATH and THD are displayed on the left side of the 7 segment LED display Press SHIFT before...

Страница 78: ...T The SHIFT key illuminates to indicate that the keys are shifted Now you can select the setup menus and functions written in purple below the keys 2 Press the desired setup or execution key Using the...

Страница 79: ...SHIFT when the digit that is being set is the digit that is furthest to the right the digit that is being set will switch to the leftmost digit that can be set Moving the Decimal Point Press SHIFT to...

Страница 80: ...at you have entered or when you want to redo measurement from scratch Procedure Follow the procedure indicated by the thick lines in the following menu 3 Display C 4 5 End the operation and if YES is...

Страница 81: ...range blinks in display C If you previously set the voltage range to the AUTO indicator for the voltage range is lit the voltage range that has been automatically selected on the basis of the measured...

Страница 82: ...een automatically selected on the basis of the measured current blinks 2 Press or to display the current range that you want to select in display C 3 Press The current range is confirmed and each of t...

Страница 83: ...Manual IM WT310 01EN WT332 WT333 Current Ranges Display C 1 3 Confirm the setting Display C 1 3 Confirm the setting When the Crest Factor Is Set to 6 When the Crest Factor Is Set to 3 The unit is A Th...

Страница 84: ...element the average current and voltage of each of the wired input elements and the total power of each of the input elements are displayed in accordance with the selected wiring system The current an...

Страница 85: ...A on the WT310 WT310HC Function keys Press the key for display A and select V When you press the function and unit indicators for display A light in the following order To display the voltage on disp...

Страница 86: ...e decimal point so that the measured value can be displayed using the number of digits available in display A The unit prefix changes in accordance with the position of the decimal point m 10 3 k 10 3...

Страница 87: ...TION Only apply voltages that are within the range of 0 V to 5 V to the remote control input pins Do not short or apply external voltages to the output pins Doing so may damage the WT300 series D A Ou...

Страница 88: ...ction No Connection No Connection DA 4ch DA12 WT332 WT333 No Connection 1 2 3 4 5 6 7 8 9 10 11 12 EXT COM EXT HOLD EXT START EXT RESET DA COM No Connection DA 11ch DA 9ch DA 7ch DA 5ch DA 3ch DA 1ch...

Страница 89: ...el during integration Use this signal when you are observing integration Approx 25 ms or more Approx 25 ms or more Holding the Updating of Displayed Data This produces the same effect as pressing HOLD...

Страница 90: ...ress and to set area A the output function Press to move to area B Press and to select an element you cannot select an element for On the WT332 WT333 select the element in the following steps 9 and 10...

Страница 91: ...ltage peak current peak and integrated values using a 5 V FS DC voltage Number of Channels The number of channels varies depending on the specific option that is installed DA4 option on the WT310 WT31...

Страница 92: ...setting the D A output format You can select from the following options u voltage U i current I P active power P VA apparent power S VAr reactive power Q PF power factor dEG phase angle uFrq voltage...

Страница 93: ...pt for those indicated below is 0 V Efficiency average active power during integration D A Output Range Mode Range Mode For products with firmware version 1 04 and later You can select the D A output...

Страница 94: ...your own relay and relay driving circuit Below the lower limit 5 V output Greater than or equal to the lower limit and less than the upper limit 0 V output Greater than or equal to the upper limit 5 V...

Страница 95: ...ms D A output Approx 7 5 V Approx 7 0 V 5 0 V 0 5 0V 100 100 140 140 Approx 7 0 V Approx 7 5 V Displayed value Displayed Value 140 100 0 100 140 Output Approx 7 0 V 5 0 V 0 V 5 0 V pprox 7 0 V The ran...

Страница 96: ...is 600 W 1500 W 5V 2 0 V 1 For information about the power range of wiring unit see the table of function expressions on the second page of the appendix in the User s Manual IM WT310 01EN PDF This ta...

Страница 97: ...heck the measurement cable wiring 2 8 to 2 11 Check the wiring system Applies to the WT332 WT333 2 8 to 2 11 2 21 Confirm that the line filter is off 2 91 Check the measurement period settings 2 81 Ch...

Страница 98: ...set the integration operation 5 32 842 You tried to start integration during an integration operation 5 32 843 The integrated value overflowed during integration or ended abnormally because of power f...

Страница 99: ...ler to have parts replaced Part Name Recommended Replacement Interval Current input relay only for the WT310 A relay for switching the current input circuit The relay s specifications indicated below...

Страница 100: ...6 4 IM WT310 02EN 6 4 Calibration and Adjustment For calibration and adjustment contact your nearest YOKOGAWA dealer...

Страница 101: ...Input resistance Approx 2 M input capacitance Approx 13 pF in parallel with the resistance Current Direct input WT332 WT333 Crest factor 3 0 5 A 1 A 2 A 5 A 10 A 20 A Crest factor 6 0 25 A 0 5 A 1 A...

Страница 102: ...RMS value of 40 A whichever is less WT310 Crest factor 3 5 mA 10 mA 20 mA 50 mA 100 mA 200 mA Crest factor 6 2 5 mA 5 mA 10 mA 25 mA 50 mA 100 mA Peak value of 30 A or RMS value of 20 A whichever is...

Страница 103: ...310HC and external current sensor input EX2 Option Within 0 001 f of range Maximum rated range Rated range The maximum rated range is 600 V for the voltage input terminal and 20 A for the current inpu...

Страница 104: ...Hz A Hz THD V THD A D D D D voltage frequency current frequency total harmonic distortion of voltage total harmonic distortion of current During harmonic measurement Item Indicator Displayed On Meani...

Страница 105: ...e 0 1 of reading 0 2 of range 1 kHz f 10 kHz 0 07 f of reading 0 3 of range 0 07 f of reading 0 3 of range 0 13 f of reading 0 3 of range 10 kHz f 20 kHz 0 13 f of reading 0 5 of range 10 kHz f 100 kH...

Страница 106: ...al When the data update interval is 100 ms add 0 05 of reading to the 0 5 Hz to 1 kHz accuracies Guaranteed accuracy ranges for frequency voltage and current direct input All accuracy figures for 0 5...

Страница 107: ...aused by voltage input Add 0 0000001 U2 of reading to the AC power accuracies Add 0 0000001 U2 of reading 0 0000001 U2 of range to the DC power accuracies U is the voltage reading V Influence of self...

Страница 108: ...e as the temperature coefficient for voltage and current Accuracy when the crest factor is set to 6 Accuracy obtained by doubling the measurement range error for the accuracy when the crest factor is...

Страница 109: ...ured value is updated Range decrease The range is decreased when all of the following conditions are met Urms or Irms is less than or equal to 30 of the measurement range Urms or Irms is less than or...

Страница 110: ...crest factor is set to 6 Frequency filter is ON when measuring voltage or current of 200 Hz or less Accuracy 0 06 of reading 7 4 3 Computation Item Specifications Computing equation of apparent power...

Страница 111: ...ard integration mode or repetitive integration mode Timer Automatically stop integration by setting a timer Selectable range 0 hours 00 minutes 00 seconds to 10000 hours 00 minutes 00 seconds Set auto...

Страница 112: ...oltage Current Power 10 Hz f 45 Hz 0 15 of reading 0 35 of range 0 15 of reading 0 35 of range 0 35 of reading 0 50 of range 45 Hz f 440 Hz 0 15 of reading 0 35 of range 0 15 of reading 0 35 of range...

Страница 113: ...9 Crest factor 99999 9999 Four arithmetic operation 99999 9999 Average active power 99999 9999 Voltage peak 99999 9999 Current peak 99999 9999 Power peak 99999 9999 The computation accuracy the value...

Страница 114: ...on for stored measurement data Setup information Saves Loads four patterns of setup information Number of blocks which can be stored Model normal measurement normal harmonic measurement WT310 WT310HC...

Страница 115: ...Code ISO ASCII codes Mode Addressable mode Addresses 0 to 30 Clear remote mode Press LOCAL to clear remote mode except during Local Lockout 7 9 Serial RS 232 Interface Standard on C2 Item Specificatio...

Страница 116: ...E TX 10BASE T Transfer rate 100 Mbps max Communication protocol TCP IP Supported services DHCP remote control VXI 11 7 12 Safety Terminal Adapter Item Specifications Maximum allowable current 36 A Die...

Страница 117: ...otection cover 1 piece that matches the main unit Hind feet rubber 1 set User s manual 1 piece this manual Safety terminal adapter WT310 WT310HC Red Black 1 set WT332 Red Black 2 sets WT333 Red Black...

Страница 118: ...ard 3 This instrument is measurement category II product Do not use for Measurement Categories III and IV Measurement category O applies to measurement of other circuits that are not directly connecte...

Страница 119: ...nting surface Mounting surface Mounting surface 20 20 20 250 213 88 179 19 480 460 99 50 24 5 99 50 24 5 480 460 482 6 460 482 6 463 88 76 2 5 9 88 76 2 5 9 Mounting surface 20 11 6 11 6 7 1 7 1 Unles...

Страница 120: ...20 20 20 213 13 132 20 480 460 24 5 149 100 24 5 480 460 482 6 460 482 6 463 37 4 132 57 2 37 4 Mounting surface 20 6 17 6 7 1 7 1 Unless otherwise specified tolerances are 3 however tolerances are 0...

Страница 121: ...e effect of iV on the measurement accuracy is 0 01 or less If the input voltage is 100 V and the current is 5 A iV 0 05 mA 100 V 2 M so the effect of iV on the measurement accuracy is 0 001 0 05 mA 5...

Страница 122: ...circuit Outer case Grounding Shielded case of the current measurement circuit As an example we will consider the case when the outer case and one side of the power supply are grounded In this case the...

Страница 123: ...cannot be ignored If you connect the WT300 series current input terminal to the side of the power supply SOURCE that is close to its earth potential the WT300 series current measurement circuit posit...

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