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YOKOGAWA WT332 User Manual Download Page 99

6-3

IM WT310-02EN

Troubleshooting, Maintenance, and Inspection

1

2

3

4

5

6

7

App

Index

6.3  Recommended Part Replacement

Contact your nearest YOKOGAWA dealer 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.

• Electrical life: Approximately 50,000 operations (at the rated capacity)

• Mechanical life: Approximately 1,000,000 operations

Backup battery

(lithium)

3 years

Summary of Contents for WT332

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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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