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4-3

IM WT310E-01EN

Measuring Power

1

2

3

4

5

6

7

8

App

Index

4.2 Displaying

Apparent Powers, Reactive Powers,

and Power Factors

Procedure

Displayed Function

Press the

FUNCTION

key for display A, B, or D to select VA (apparent power), var (reactive power), or

PF (power factor).

Each time you press FUNCTION, the displayed function changes in the order shown below.

VA

var

Display

A

PF

B

PF

D

• The THD indicator is on the left side of the 7-segment LED display.
• Press SHIFT before pressing FUNCTION to change the displayed function in reverse order.

Input Element (WT332E/WT333E only)

Press the

ELEMENT

key of the display that you selected the display function for (display A, B, or D),

and then select an input element.

The procedure for selecting an input element is the same as the procedure in section 4.1.

The WT310E and WT310EH only have one input element, so there is no input element selection.

Explanation

Displayed Function

Select which measurement function to show on the display.

•  VA: Apparent power S is displayed.
•  var: Reactive power Q is displayed.
•  PF: Power factor λ is displayed.

Maximum Displayed Value, Units, and Unit Prefixes

• Maximum displayed apparent power and reactive power: 99999 (when the number of displayed

digits is set to 5)

•  Power factor display range: –1.0000 to 1.0000 (when the number of displayed digits is set to 5)
•  Units: VA for apparent power, var for reactive power, and no unit for power factors
•  Unit prefix: m, k, or M

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Summary of Contents for WT310E

Page 1: ...IM WT310E 01EN 2nd Edition User s Manual WT310E WT310EH WT332E WT333E Digital Power Meter ...

Page 2: ... the following sheet Document No Description PIM 113 01Z2 List of worldwide contacts Notes The contents of this manual are subject to change without prior notice as a result of continuing improvements to the instrument s performance and functionality The figures given in this manual may differ from those that actually appear on your screen Every effort has been made in the preparation of this manu...

Page 3: ...ght injury to the user or cause damage to the instrument or user s data and precautions that can be taken to prevent such occurrences French AVERTISSEMENT Attire l attention sur des gestes ou des conditions susceptibles de provoquer des blessures graves voire mortelles et sur les précautions de sécurité pouvant prévenir de tels accidents ATTENTION Attire l attention sur des gestes ou des condition...

Page 4: ...key so that it illuminates 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 that you selected in step 2 appears in display C 4 Use or to select oFF or on Pressing either key cycles through 3 menu items 5 Press SET to confirm the selection of oFF The...

Page 5: ...hat 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 move the decimal point to the right If you press SHIFT when the decimal point is as far to the right as it can be the decimal point will move to the leftmost possible position Moves the digit that is being set to the right...

Page 6: ...eature When Using a VT or CT 2 13 2 6 Configuring Measurement Range Skipping 2 16 2 7 Setting the Crest Factor 2 17 2 8 Setting the Measurement Period 2 18 2 9 Configuring the Input Filters 2 19 2 10 Setting the Data Update Interval 2 21 2 11 Setting Averaging 2 23 Chapter 3 Holding Measured Values and Performing Single Measurements 3 1 Holding Measured Values 3 1 3 2 Performing Single Measurement...

Page 7: ...g System Information 8 1 8 2 Initializing the Settings 8 2 8 3 Performing Zero Level Compensation 8 4 8 4 Configuring D A Output Items Option 8 5 8 5 Enabling Key Protection 8 11 8 6 Carrying Out Self Tests Selftest 8 12 Appendix Appendix 1 Symbols and Determination of Measurement Functions App 1 Appendix 2 Power Basics Power harmonics and AC RLC circuits App 6 Appendix 3 Power Range App 14 Append...

Page 8: ...nt are divided into normal measurement and harmonic measurement and listed in the following table Measurement Functions Used in Normal Measurement Voltage Measurement Function Symbol Panel Indicator Light1 Description Measured for Each Input Element Measured for Wiring Units WT332E WT333E only U RMS V True rms voltage Yes Yes U VOLTAGE MEAN V Rectified mean voltage calibrated to the rms value Yes ...

Page 9: ...ction Symbol Panel Indicator Light Description Measured for Each Input Element Measured for Wiring Units WT332E WT333E only Time Time Integration time Yes No WP Wh Sum of positive and negative watt hours Yes Yes WP Wh Positive or negative watt hours Yes Yes q Ah Sum of positive and negative ampere hours Yes Yes q Ah Positive or negative ampere hour Yes Yes AV P MATH Average active power during int...

Page 10: ...order k Ihdf k A Harmonic distortion factor of current for harmonic order k Phdf k W Harmonic distortion factor of power for harmonic order k ΦU k V Phase difference between the voltage of harmonic order k and and the fundamental voltage ΦI k A Phase difference between the current of harmonic order k and the fundamental current k The harmonic order which is indicated in display A Harmonic Measurem...

Page 11: ...ut element is a set of input terminals that a single phase of voltage and current that you want to measure can be applied to The WT333E can be equipped with three input elements The element numbers range from 1 to 3 Wiring Systems To measure the power of various single phase and three phase power transmission systems using the WT332E WT333E not only can you specify a single phase two wire system y...

Page 12: ...ne period of the voltage is rectified and the resulting average is multiplied by the factor that would yield the true rms value if the applied signal were a sine wave When sine waves are measured the values obtained in this mode are the same as those obtained in RMS mode The values differ from those obtained in RMS mode when distorted waves or DC waves are measured T 1 t dt f t Input signal T One ...

Page 13: ...is the measured data for elements 1 and 3 The measured data for a single phase two wire system will be measured correctly regardless of which of the above wiring systems you select WT333E Three Input Element Model The WT333E is equipped with three input elements element 1 element 2 and element 3 On the WT333E you can select the following wiring systems Wiring System Description Elements 1P3W Singl...

Page 14: ...nt range is increased Range Decrease The range is decreased when all of the following conditions are met Crest factor 3 Urms or Irms is less than or equal to 30 of the measurement range Urms or Irms is less than or equal to 125 of the next lower measurement range Upk or Ipk is less than or equal to 300 of the next lower measurement range Crest factor 6 6A Urms or Irms is less than or equal to 30 o...

Page 15: ...following situations When you switch the measurement range frequently When you want to switch between measurement ranges one by one and check the measured data each time Example When you are searching for a measurement range within which over ranges and peak over ranges do not occur Power Range The measurement range power range for measuring active power apparent power and reactive power is determ...

Page 16: ...value It is also referred to as the peak to rms ratio Peak value Rms value Crest factor CF peak to rms ratio Peak value Rms value Input signal waveform On this instrument the crest factor is the ratio of the maximum applicable peak value to the measurement range Peak value that can be input Measurement range Crest factor CF peak to rms ratio You can set the crest factor to 3 6 or 6A The measurable...

Page 17: ...ement Period for Measurement Functions Used in Harmonic Measurement Option The measurement period extends from the first sample in the data update interval for 1024 points counted at the harmonic sampling frequency This instrument determines the harmonic sampling frequency automatically based on the period of the signal that is set as the PLL source The sampling data and measurement period that ar...

Page 18: ...omponents even when the frequency filter is turned on Averaging For procedures see section 2 11 You can take exponential or moving averages of the numeric data The averaging function is useful when because of large changes in the power or load or a low input signal frequency the numeric display fluctuates and is difficult to read Turning Averaging On and Off Measurement Functions Used in Normal Me...

Page 19: ...about how the values of measurement functions are determined see appendix 1 in the Getting Started Guide IM WT310E 02EN Measurement Functions Used in Normal Measurement U I P S and Q λ Φ Cf U and Cf I are computed using the averaged values of Urms Irms P S and Q Measurement Functions Used in Harmonic Measurement Option U k I k and P k λ k and Φ k are computed using the averaged values of P k and Q...

Page 20: ...he measured data at each data update interval and hold the display of all measurement function data The D A output communication output and other values reflect the held values Single Measurement SINGLE for procedures see section 3 2 While the display is held the signal is measured once at the data update interval and then the display is re held If you press SHIFT HOLD SINGLE when the display is n...

Page 21: ... U pk U pk I pk I pk P pk and P pk While the MAX hold feature is on maximum values are held Computation Functions Efficiency Only applies to the WT332E WT333E for procedures see section 4 5 You can compute the efficiency Crest Factor For procedures see section 4 5 Determines the voltage or current crest factor by dividing the peak value by the rms value Basic Arithmetic For procedures see section ...

Page 22: ...nuous repetitive integration mode Key operation Key operation Repeats when the timer expires Manual Integration Mode When you set the integration mode to standard integration mode nor and set the integration timer to 00000 00 00 this instrument performs integration in manual integration mode When you press START integration starts and it continues until you press STOP However if either of the cond...

Page 23: ...ation Mode You can set a relative integration time Integration starts when you press START When the specified integration timer time elapses integration is automatically reset and restarted Integration repeats until you press Stop If either of the conditions below is met integration is stopped and the integration time and integrated value are held You press STOP The integrated value reaches its ma...

Page 24: ...monic measurement use an input signal with low distortion and few fluctuations as the PLL source For explanations of the terms fundamental wave harmonics harmonic orders and other terms see appendix 2 Measured Harmonic Order For procedures see section 6 3 You can set the upper limit of measured harmonic order in the range of 2 to 50 However the range varies depending on the fundamental 1st harmoni...

Page 25: ...nding on the number of equipped input elements As a result the number of blocks that can be stored varies depending on the device You cannot load and display stored measurement data on the display of this instrument You can use communication functions to send stored measurement data to a PC and you can then view the data on the PC Saving and Loading Setup Parameters For procedures see section 7 2 ...

Page 26: ...ication interfaces USB GP IB suffix code C1 RS 232 suffix code C2 Ethernet suffix code C7 WTViewerFreePlus You can use the WTViewerFreePlus application that comes with this instrument to save measured data to a PC and change the settings of this instrument without creating your own communication control programs WT310E WT310EH WT332E WT333E PC monitor Saved data Setting changes Example of a window...

Page 27: ...ltage current active power apparent power reactive power power factor phase angle frequency voltage peak current peak and integrated values as a 5 V FS DC voltage You can output values using 4 output channels on the WT310E WT310EH and 12 output channels on the WT332E WT333E Remote Control Option for details see chapter 5 of the Getting Started Guide IM WT310E 02EN On models with the DA4 or DA12 op...

Page 28: ...cal Equations RMS Select this mode to display the true rms values of the voltage and current T 1 T 0 t 2 dt f t Input signal T One period of the input signal VOLTAGE MEAN Select this mode to display the voltage as a rectified mean value calibrated to the rms value A sine wave is used to calibrate the value to the rms value so when sine waves are measured the values obtained in this mode are the sa...

Page 29: ...ted to the Rms Value Linear Average Sine wave Half wave rectification Full wave rectification Direct current Triangular wave Square wave Pulse RMS VOLTAGE MEAN DC Ep 2 Ep 2 Ep 2 Ep Ep 3 Ep D Ep τ 2π Ep 2 π Ep Ep π 2 π Ep Ep Ep 2 Ep D Ep τ 2π Ep Ep 2 Ep 2 2 Ep 2 π 2 2 Ep π 4 2 Ep π 2 2 Ep π τ 4π 2 Ep πD 2 2 Ep D Ep τ 2π Ep 2 π Ep 0 0 Ep τ 2π When the above is expressed using duty D π 0 Ep π 0 Ep π ...

Page 30: ...ments 1 and 3 The measured data for a single phase two wire system will be measured correctly regardless of which of the above wiring systems you select WT333E Three Input Element Model The WT333E is equipped with three input elements element 1 element 2 and element 3 On the WT333E you can select the following wiring systems Wiring System Description Elements 1P3W Single phase three wire Element 1...

Page 31: ...n Mode Display C 1 3 2 Confirm the setting The options on the left appear when the crest factor has been set to 3 The following options appear when the crest factor has been set to 6 or 6A Auto 300 150 75 30 15 7 5 Current Range in Menu Configuration Mode WT310E 3 Display C 1 2 Confirm the setting The unit is A The unit is mA The options on the left appear when the crest factor has been set to 3 T...

Page 32: ... crest factor has been set to 6 or 6A Auto 10 5 2 5 1 0 5 0 25 SEnSor Note SEnSor only appears when the external current sensor input option is installed For details about the procedure when selecting SEnSor see section 2 4 Voltage and Current Range in Quick Configuration Mode 1 Press the VOLTAGE or CURRENT key In quick configuration mode the VOLTAGE or CURRENT key and the and keys illuminate No d...

Page 33: ...he measurement range frequently When you want to switch between measurement ranges one by one and check the display in each range when you are searching for a measurement range within which over ranges and peak over ranges do not occur Note In quick configuration mode when you press the VOLTAGE or CURRENT key the VOLTAGE or CURRENT key and the and keys illuminate When you press SETUP or some other...

Page 34: ...any of the following conditions is met Crest factor 3 Urms or Irms exceeds 130 of the measurement range Upk or Ipk exceeds approximately 300 of the currently set measurement range Crest factor 6 Urms or Irms exceeds 130 of the measurement range Upk or Ipk exceeds approximately 600 of the currently set measurement range Crest factor 6A Urms or Irms exceeds 260 of the measurement range Upk or Ipk ex...

Page 35: ...tage three current method 3P4W three phase four wire Voltage range current range 3 The maximum display is 99999 when the number of displayed digits is set to 5 When the result of multiplying the voltage range by the current range reaches or exceeds 1000 W the unit on the display will change to kW When the result exceeds 1000 kW the unit on the display will change to MW For specific voltage and cur...

Page 36: ...oint Press to move the digit Set all the values Display C 5 Confirm the setting Close menu On the WT332E WT333E 4 5 11 Confirm the setting 5 Select the setting method Display C Set all the values Display D Set element 1 Display B 7 6 The same operation as step 6 Set element 2 Display C 8 The same as step 6 9 Set element 3 Display D 10 The same as step 6 Close menu 6 Press and to set the number Pre...

Page 37: ...o E 5 E 2 5 E 1 25 dirECt The above options appear when the crest factor has been set to 3 The following options appear when the crest factor has been set to 6 or 6A Auto E 1 E 0 5 E 250 E 100 E 50 E 25 dirECt The above menu is displayed on the WT332E WT333E On the WT310E SEnSor appears after the 5 mA range On the WT310EH SEnSor appears after the 1 A range External Current Sensor Measurement Range...

Page 38: ...nt to the conversion ratio Determining the Scaling Constant For example if you use the Yokogawa 96030 Clamp on Probe the conversion ratio is 2 5 mV A so when 1 A of current flows through the probe the current sensor output is 2 5 mV Set the scaling constant to 2 500 In the same manner when you use the 96031 the conversion ratio is 1 mV A so set the scaling constant to 1 000 When you use the 96001 ...

Page 39: ...ternal Current Sensor Range Example 1 If you are using the 96030 Clamp on Probe which has a 2 5 mV A conversion ratio to measure a current of 200 A the output voltage of the probe will be 2 5 mV A 200 A 500 mV Therefore you should set the current range external current sensor range this instrument to the 500 mV range that is available when the EX2 option is installed Example 2 If you are using the...

Page 40: ...B Set the CT ratio Display C 11 10 The same as step 8 Set the power coefficient Display D 13 12 The same as step 8 15 Confirm the setting Close menu 8 Press and to set the number Press to move the decimal point Press to move the digit 7 Set the VT ratio Display B Set the CT ratio Display C 9 8 The same as step 6 Set the power coefficient Display D 10 The same as step 6 6 Press and to set the numbe...

Page 41: ... Result Voltage U U2 secondary output of the VT U2 V V VT ratio Current I I2 secondary output of the CT I2 C C CT ratio Active power P P2 P2 V C F F Power coefficient Apparent power S S2 S2 V C F Reactive power Q Q2 Q2 V C F Max min voltage Upk Upk2 secondary output of the VT Upk2 V Max min current Ipk Ipk2 secondary output of the CT Ipk2 C Scaling Coefficient Setting All the Coefficients or Indiv...

Page 42: ...ion menu after you have finished setting the coefficients Turning Scaling On and Off After you have set the coefficients select whether to set scaling to on or oFF The default setting is oFF on Scaling starts and the SCALING indicator illuminates oFF Scaling is stopped The SCALING indicator turns off Note When the product of the coefficient and the measurement range exceeds 9999 M 106 the computat...

Page 43: ... through the communication interface You cannot specify which measurement ranges to skip from the display men of this instrument For details see the Communication Interface User s Manual IM WT310E 17EN You can also specify which measurement ranges to skip using the WTViewerFreePlus software When using communication commands select the enabled measurement ranges not the ranges to skip Peak Over Jum...

Page 44: ...ge changes when measuring a distorted waveform in auto range mode Condition for increasing the range in auto range mode for details see section 2 3 The voltage or current exceeds 260 of the currently set measurement range Condition that cause an over range indication o L for details see section 7 4 in the Getting Started Guide IM WT310E 02EN The measured voltage or current exceeds 280 of its rated...

Page 45: ... used as the synchronization source for the element When the period of the voltage signal cannot be detected the current signal is used as the synchronization source When the period of the current signal cannot be detected either the measurement period is set to the entire duration of the data update interval Curr Priority is given to the detection of the period of the current signal and the curre...

Page 46: ...play B 1 3 5 Confirm the setting Close menu 6 Explanation There are two types of input filters the line filter and the frequency filter You can use these filters to eliminate the noise of inverter waveforms distorted waveforms and the like and acquire stable measured values Line Filter The line filter is only applied to the measurement circuit The line filter removes noise components from the inpu...

Page 47: ...d correctly The default setting is oFF on The frequency filter is enabled and the FREQ indicator illuminates oFF The frequency filter is disabled The FREQ indicator turns off Even if you enable the frequency filter the measured voltage and current values will include harmonic components Note You cannot enable or disable input filters between the time when integration is started and the time when i...

Page 48: ...data update interval from the options below The default setting is 0 25 s 0 1 s 0 25 s 0 5 s 1 s 2 s 5 s 10 s 20 s or Auto At each data update interval the numeric data is updated stored converted and output as analog signals and transmitted through the communication interface The UPDATE indicator blinks in sync with the selected interval When set to Auto every time a period of the input waveform ...

Page 49: ...y U3 The synchronization source is set to the voltage of element 3 WT332E and WT333E I3 The synchronization source is set to the current of element 3 WT332E and WT333E Timeout Timeout is the time limit for detecting the period of the input waveform Select 1s 5s 10s or 20s The default value is 1s If the input signal frequency is low and the period of the synchronization source cannot be detected wi...

Page 50: ...cated by the thick lines in the following menu Averaging Type Select averaging Display B 1 2 8 Set the coefficient Display D 9 Confirm the setting Close menu 3 7 Select the type of processing Display C 6 4 Display C 5 10 Turning Averaging On and Off Select averaging Display B 1 3 4 Display C 5 Confirm the setting Close menu 2 6 ...

Page 51: ...pk I pk I pk P pk P pk Time WP WP WP q q and q Averaging Type You can use exponential EP or moving Lin averages The default setting is Lin Exponential Averaging EP With the specified attenuation constant the numeric data is exponentially averaged according to the equation below Dn Mn Dn 1 K Dn 1 Dn Displayed value that has been exponentially averaged n times The first displayed value D1 is equal t...

Page 52: ...ponential averages and moving averages Turning Averaging On and Off After you set the averaging coefficient the attenuation constant or average count select whether to set averaging to on or oFF The default setting is oFF on Averaging starts and the AVG indicator illuminates oFF Averaging is stopped The AVG indicator turns off Note When you start integration averaging is disabled Even after integr...

Page 53: ... measured values are being held The hold key light will turn off and the display will be updated Explanation Hold You can use the hold operation to stop measuring and displaying the measured data at each data update interval and hold the display of all measurement function data The D A output communication output and other values reflect the held values Note For information about holding during in...

Page 54: ...play is held measurement is performed once After the measured data is updated the display is re held If you press SHIFT HOLD SINGLE when the display is not held measurement restarts from that point Holding the SHIFT key for at least two seconds makes the shifted state continuous SHIFT lock feature If you plan on performing single measurements frequently you can enable the SHIFT lock and perform si...

Page 55: ... The MATH and THD indications are on the left side of the 7 segment LED display Press SHIFT before pressing FUNCTION to change the displayed function in reverse order Input Element WT332E WT333E only Press ELEMENT to select which element to display Each time you press ELEMENT the input element changes in the order shown below The WT310E and WT310EH only have one input element so there is no input ...

Page 56: ...he measurement range Maximum Displayed Value Units and Unit Prefixes Maximum displayed value 99999 for voltage current and active power when the number of displayed digits is set to 5 Units V for voltage A for current and W for active power Unit prefix m k or M Input Element WT332E WT333E only The elements that you can select vary depending on the model Check the model when selecting elements 1 2 ...

Page 57: ...hat you selected the display function for display A B or D and then select an input element The procedure for selecting an input element is the same as the procedure in section 4 1 The WT310E and WT310EH only have one input element so there is no input element selection Explanation Displayed Function Select which measurement function to show on the display VA Apparent power S is displayed var Reac...

Page 58: ...rror Error A power factor of 2 0000 to 1 0001 is displayed as 1 0000 A power factor of 2 0001 or less is displayed as an error Error Even when the input signal is the same the display may change if you change the measurement mode RMS VOLTAGE MEAN or DC For details on measurement modes see section 2 1 When either the voltage or current falls to 0 5 or less 1 or less if the crest factor is set to 6 ...

Page 59: ...f the display that you selected the display function for display B or D and then select an input element The procedure for selecting an input element is the same as the procedure in section 4 1 The WT310E and WT310EH only have one input element so there is no input element selection Explanation Displayed Function Select which measurement function to show on the display Phase angle Φ is displayed V...

Page 60: ... is set to 6 or 6A of the measurement range the phase angle will be displayed as an error Error A proper distinction between phase lag and lead can only be made when both the voltage and current are sine waves and the ratios of the voltage and current input to the measurement range are not significantly different When the power factor is greater than 1 the phase angle is displayed as follows When ...

Page 61: ...he procedure in section 4 1 The WT310E and WT310EH only have one input element so there is no input element selection Explanation Displayed Function Select which measurement function to show on the display Vpk The peak voltage is displayed Select U pk to display the highest voltage and U pk to display the lowest voltage Apk The peak current is displayed Select I pk to display the highest current a...

Page 62: ...play on the WT333E The display changes depending on the number of elements that are equipped 6 Displayed Function Press the FUNCTION key for display C to select MATH computation functions Each time you press FUNCTION the displayed function changes in the order shown below Display C MATH Vpk Apk Wpk Wh and Ah all illuminate twice The first time is for the positive measurements and the second time i...

Page 63: ...power measured by element 3 P3 as the power consumed by the secondary side of the inverter Inverter Primary side P1 Secondary side P3 Output side Equation Efficiency 100 P3 P1 WT333E The WT333E computes the efficiency by taking the active power measured by element 2 P2 as the active power applied to the primary side of the inverter and the active power measured by elements 1 and 3 P1 and P3 as the...

Page 64: ...or 6A of the rated range value the crest factor will be displayed as an error Error You can compute the crest factor even when the measurement mode is VOLTAGE MEAN or DC Basic Arithmetic There are six different types of computation that you can perform A B A B A B A B A2 B A B2 The values of display A and display B are used in the computation and the results of the computation are shown in display...

Page 65: ... of display B from the value of display A power loss is displayed Computation example 1 P1 Any Display A Display B Display C Wiring System P1 P3 P1 P3 P3 Inverter Computation example 2 3P3W Display A Display B Display C Wiring System PΣ P1 P3 P2 PΣ P2 P2 P1 P3 Inverter Computation example 3 3P3W Display A Display B Display C Wiring System P2 P2 PΣ P2 P1 P3 PΣ P1 P3 Inverter 4 5 Displaying the Effi...

Page 66: ...ms I1rms Z U1rms I1rms U1 I1 Power supply Load When computing the line voltage ratio and line current ratio for three phase wiring Computation example 2 I1rms I3rms I1rms I3rms 3P3W Display A Display B Display C Wiring System U1rms U3rms U1rms U3rms U1 Power supply Load U3 I1 I3 A B2 The result of dividing the value of display A by the square of the value of display B is displayed When computing i...

Page 67: ...integration time is displayed AV P2 The result of dividing the watt hour of element 2 WP2 by the elapsed integration time is displayed WT333E only AV P3 The result of dividing the watt hour of element 3 WP3 by the elapsed integration time is displayed WT332E and W333 AV P4 The result of dividing the watt hour of element Σ WP Σ by the elapsed integration time is displayed WT332E and W333 Watt hour ...

Page 68: ... basic arithmetic and average active power 99999 Units Average active power The unit is W but it does not appear on the display Efficiency The unit is but it does not appear on the display Crest factor and four arithmetic operation No unit Unit Prefixes Basic arithmetic and average active power m k or M Other computations efficiency and crest factor No prefix When the displayed function is set to ...

Page 69: ...abled is held If a value larger than the currently held value is measured the larger value is held You can hold the following maximum values The default setting is oFF U voltage I current P active power S apparent power Q reactive power U pk and U pk peak voltage I pk and I pk peak current and P pk and P pk peak power on The MAX HOLD indicator illuminates and the MAX hold feature is enabled oFF Th...

Page 70: ...nctions other than the phase angle integrated values and the elapsed integration time The default setting is Hi Hi 5 digits are displayed 99999 Lo 4 digits are displayed 9999 Note The actual number of displayed digits may be lower than the maximum number of displayed digits as a result of voltage and current range combinations and automatic digit increases The displays of the phase angle integrate...

Page 71: ...Manual integration mode Key operation Key operation Standard integration mode Key operation Stopped by the timer Continuous repetitive integration mode Key operation Key operation Repeats when the timer expires Manual Integration Mode When you set the integration mode to standard integration mode nor and set the integration timer to 00000 00 00 this instrument performs integration in manual integr...

Page 72: ... Integrated value Integration time Continuous Integration Mode You can set a relative integration time Integration starts when you press START When the specified integration timer time elapses integration is automatically reset and restarted Integration repeats until you press Stop If either of the conditions below is met integration is stopped and the integration time and integrated value are hel...

Page 73: ...mode has been set to RMS the current values measured at each data update interval see section 2 10 are integrated Note If you stop integration the integration process stops at the integrated value and elapsed integration time of the previous display update The measured values between the previous display update and the execution of the integration stop are not integrated Display Resolution during ...

Page 74: ... watt hour is being displayed the displayed value is preceded by a minus sign 2 When Ah is the displayed function the displayed function will be Ah whether you press the FUNCTION key once or twice When you press the function key once and switch to Ah the positive ampere hour will be displayed If you press the FUNCTION key once more the negative ampere hour for Ah will be displayed When the negativ...

Page 75: ...ion timer setting When the integration timer is set to 0 00 00 the mode is set to manual integration mode When the integration timer is set to a value other than 0 00 00 the mode is set to standard integration mode Cont Select this setting to set the mode to continuous integration mode Integration Timer Set the integration time You can set the integration time to a value between 0 00 00 0 h 0 min ...

Page 76: ...hich element to display The procedure for selecting an input element is the same as the procedure in section 4 1 The WT310E and WT310EH only have one input element so there is no input element selection Starting and Stopping Integration 1 Press START The START key illuminates and integration starts The integrated value or the average active power during integration is shown on display C and the el...

Page 77: ...Ah or 99999 when a negative value is displayed Units Wh for the integrated power watt hour and Ah for the integrated current ampere hour Unit prefix m k or M for integrated values Display and Resolution of the Elapsed Integration Time The elapsed integration time can be displayed using up to 9 total digits for hours minutes and seconds This instrument shows the elapsed integration time in display ...

Page 78: ...ntinue to blink When the hold on the displayed values is released the integration results values and time at the point in time when the hold is released will be displayed For details on how START STOP key operations relate to held values see section 5 4 Stopping Integration If you stop integration the integration process stops at the integrated value and elapsed integration time of the previous di...

Page 79: ...d on the displayed values or perform a single measurement by pressing SHIFT HOLD SINGLE the integration results at that point in time are displayed and output through communication ON HOLD OFF Displayed value Elapsed integration time The dotted line is the integrated value START STOP RESET Stopping integration when values are held Display and communication output values do not change from the held...

Page 80: ... be resumed if a power failure occurs and recovers while integration is in progress Description If this function is set to ON and a power failure occurs and then recovers while integration is in progress the START key is illuminated or while integration is paused the STOP key is illuminated this instrument behaves in the following manner The integration result before the power failure is displayed...

Page 81: ...tion Yes Yes Yes No Yes No Yes Settings can be changed No Settings cannot be changed An error code will be displayed if you attempt to change the settings 1 Measurement ranges can be changed by the auto range feature but you cannot change ranges manually 2 When you start integration averaging is disabled Even after integration stops and is reset averaging is not enabled again Auto Range Feature an...

Page 82: ...nication Computation of the Integrated Value When the Measured Value Exceeds the Measurement Limit for Fixed Ranges When the sampled instantaneous voltage or current value exceeds approximately 333 approximately 666 when the crest factor is set to 6 or 6A of the measurement range the value is processed as if it were approximately 333 approximately 666 when the crest factor is set to 6 or 6A of the...

Page 83: ...e harmonic order shown in display A Shows the harmonic distortion factor of voltage for the harmonic order shown in display A Shows the harmonic distortion factor of current for the harmonic order shown in display A Shows the harmonic distortion factor of active power for the harmonic order shown in display A When display A is showing the 1st harmonic fundamental Shows the phase angle of the 1st h...

Page 84: ... over range indication oL or indication for measured values that are too small See Indications When the Measured Value Is Too Small on page 1 12 in the Getting Started Guide IM WT310E 02EN Measurement Suspension No Data Indication Hyphens Hyphens are displayed in the following circumstances When there is no analysis data to display during harmonic measurement data display Immediately after the har...

Page 85: ... A Display Display D C B A THD is displayed on the left side of the 7 segment LED display Press SHIFT before pressing FUNCTION to change the displayed function in reverse order Source Element WT332E WT333E only Press ELEMENT to select which element to display Each time you press ELEMENT the input element changes in the order shown below The WT310E and WT310EH only have one input element so there i...

Page 86: ...99 999 and 100 00 to 999 99 A Shows the harmonic distortion factor of current for the harmonic shown in display A When the number of displayed digits is 5 the display range is 0 000 to 99 999 and 100 00 to 999 99 W Shows the harmonic distortion factor of active power for the harmonic shown in display A When the number of displayed digits is 5 the display range is 0 000 to 99 999 and 100 00 to 999 ...

Page 87: ...l wave 1st harmonic VHz Shows the voltage frequency AHz Shows the current frequency THD V Shows the voltage distortion factor There are two types of equations For details see section 6 3 The display range is 0 000 to 99 999 and 100 00 to 999 99 THD A Shows the current distortion factor There are two types of equations For details see section 6 3 The display range is 0 000 to 99 999 and 100 00 to 9...

Page 88: ...p frequency synchronization source which is used to determine the fundamental frequency The fundamental frequency is the reference for the measured harmonics of harmonic measurement The default value is U1 Be sure to specify a signal with the same period as the harmonic measurement source waveform Selecting an input signal with small distortion and fluctuation for the PLL source will enable stable...

Page 89: ...d varies depending on the fundamental frequency The default value is 50 Example Up to 50 when the fundamental frequency is 50 Hz Up to 4 when the fundamental frequency is 1 2 kHz Note When a harmonic order exceeding the upper limit is specified display B shows hyphens For details on the upper limit of measured harmonic order see section 7 3 in the Getting Started Guide IM WT310E 02EN THD equation ...

Page 90: ... Turning Measured Data Storage On and Off 3 Display C 4 5 2 Select the storage feature Display B 1 Confirm the setting Close menu 6 Explanation Storing Measured Data You can store measured data to the internal memory Stored Items All measured data computed data integrated data and frequencies voltage and current are stored If the harmonic data display is set to ON see section 6 2 on a model with t...

Page 91: ... Off After you set the storage interval select whether to set the storage feature to ON or OFF The default value is oFF on Storage starts and the STORE indicator blinks at the pace at which storage is taking place oFF Storage stops and the STORE indicator stops blinking Note When you stop storage and restart it the data in the memory will be overwritten Stored data will be deleted if you Turn off ...

Page 92: ...up parameters to the internal memory Set the save destination to FiLE1 FiLE2 FiLE3 or FiLE4 The current setup parameters shown below will be saved Measurement range measurement mode measurement synchronization source scaling settings averaging settings input filter settings MAX hold ON OFF setting computation settings number of displayed digits data update interval crest factor integration setting...

Page 93: ...rmation Display B 1 3 Confirm the setting Measurement screen returns 5 Explanation System Information You can display the following information about this instrument Item Meaning Model Model Suff 1 Suffix code Suff 2 The rest of the suffix code No Instrument number Ver Firmware version For details on models and suffix codes see page ii in the Getting Started Guide IM WT310E 02EN Chapter 8 Other Fe...

Page 94: ...WT310EH U1 WT332E WT333E I1 Timeout 1s Line filter OFF Frequency filter OFF Measurement synchronization source WT310E WT310EH VoLt voltage WT332E WT333E Curr current Measurement range Auto range Measurement range skip OFF Measurement mode RMS Wiring system WT332E WT333E only 1P3W Hold OFF MAX hold OFF Scaling V 1 000 C 1 000 F 1 000 Scaling ON OFF OFF External current sensor scaling constant 10 00...

Page 95: ... all of the settings to be returned to their default values You cannot undo an initialization We recommend that you save the setup parameters before you initialize this instrument see section 7 2 Initializing Using Communication Commands Initialization of setup parameters executed through communication commands RST command works in the same way as the initialization executed through the UTILITY ke...

Page 96: ...the Getting Started Guide IM WT310E 02EN Zero level compensation is automatically performed when you change the measurement range Note To make accurate measurements we recommend that you execute zero level compensation after warming up the instrument for at least 30 minutes Also the ambient temperature should be stable and within the specified range see chapter 7 in the Getting Started Guide IM WT...

Page 97: ... WT333E A B 3 8 9 10 Press 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 WT332E WT333E select the element in the following steps 9 and 10 1 13 Confirm the setting Close menu 2 6 14 1 The number of channels varies depending on the specific option that is installed DA4 option on the WT310E WT310EH 4 channels DA12 ...

Page 98: ...that is installed DA4 option on the WT310E WT310EH 4 channels DA12 option on the WT332E WT333E 12 channels Output Format You can select a preconfigured output format or configure your own original format Using the Default Settings Select one of the default settings to output preconfigured default items Default Values for Normal Measurement dFLt n Select this setting to output normal measurement va...

Page 99: ...he procedural explanation for 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 Φ uFrq voltage frequency fU iFrq current frequency fI uP voltage peak Upk iP current peak Ipk Ph total watt hour Wp Ph positive watt hour Wp Ph negative watt hour Wp Ah total ampere ho...

Page 100: ...set the element to Σ this instrument produces 100 D A output 5 V when scaled rated values are applied to the elements The D A output for all math functions except for those indicated below is 0 V Efficiency average active power during integration D A Output Range Mode Range Mode You can select the D A output range mode from the following options The default setting is Fixed You can set this featur...

Page 101: ...ction provide 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 output Maximum and Minimum Values in Manual Range Mode and Comparison Upper and Lower Limits in Comparator Mode You can select a value between 9 999E 12 and 9 999E 12 The default settin...

Page 102: ...ox 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 Output Approx 7 0 V 5 0 V 0 V 5 0 V Approx 7 0 V Displayed Value The range between 5 to 7 V and 5 to 7 V is not output for λ and Φ When an error occurs the output is approximately 7 5 V For the efficiency math function 5 V represents 100 For Upk and Ipk 5 V represents the application of 3 times the rated r...

Page 103: ...ates and all keys except for the power switch and KEY PROTECT are disabled Disabling Key Protection In the key protected condition press SHIFT INTERFACE KEY PROTECT The KEY PROTECT indicator turns off and all keys are enabled Explanation Key Protection You can disable lock the front panel keys The following switch and key are exceptions Power switch KEY PROTECT to disable key lock ...

Page 104: ...u Memory Test Test item Display C 4 2 Execute self test Display B 1 3 5 Execute test 6 The display changes in this order 7 End test Close menu 8 Panel Key Test Test item Display C 4 2 Execute self test Display B 1 3 5 Execute test 6 7 Close menu Pressing a key causes the corresponding number to appear Press SHIFT twice to end the test 8 ...

Page 105: ...em Display C 4 2 Execute self test Display B 1 3 5 Execute test 6 7 Close menu End test Pressing the keys causes the LED to illuminate one by one 8 Ending a Test Test item Display C 4 2 Execute self test Display B 1 3 5 End test Close menu 6 8 6 Carrying Out Self Tests Selftest ...

Page 106: ...ys The test is successful if the numbers corresponding to the pressed keys are displayed To exit from the key test press SHIFT twice LED Test LEd The LED test checks the front panel indicators The test is successful if you press the and arrow keys and the front panel LEDs turn on and off one by one To exit from the LED test press SHIFT Ending the Self Test End The self test ends If an Error Occurs...

Page 107: ...mum u n i n for every data update Upk U pk or U pk whichever is larger Ipk I pk or I pk whichever is larger Active power P W Reactive power Q var Apparent power S VA Power factor λ Phase difference Φ Measurement Function Voltage U V Current I A The phase angle displays lead D and lag G Methods of Computation and Determination For information about the symbols in the equations see the notes on the ...

Page 108: ...t of time is hours q is the sum of i n s positive and negative ampere hours q is the sum of the above equations for all iterations where i n is positive q is the sum of the above equations for all iterations where i n is negative n 1 N 1 N IΣ A COS 1 PΣ SΣ WPΣ Wh qΣ Ah WPΣ WP1 WP3 WP1 WP2 WP3 λΣ ΦΣ PΣ SΣ qΣ q1 q3 q1 q2 q3 WP 1 WP 3 WP 1 WP 3 WP 1 WP 2 WP 3 WP 1 WP 2 WP 3 WP Σ WP Σ q Σ q Σ q 1 q 2 ...

Page 109: ...ned on this instrument may differ from that obtained on other instruments that use a different method For Q when the current leads the voltage the Q value is displayed as a negative value when the current lags the voltage the Q value is displayed as a positive value The value of QΣ may be negative because it is calculated from the Q of each element with the signs included Appendix 1 Symbols and De...

Page 110: ...to max harmonics Harmonic order 1 fundamental wave Fundamental frequency of the voltage or current set as the PLL source Phase difference between I 1 and U 1 Same as above Continued on next page PLL source frequency fU fI Hz Note k denotes a harmonic order r denotes the real part and j denotes the imaginary part U k Ur k Uj k I k Ir k and Ij k are expressed using rms values The upper limit of meas...

Page 111: ... k 2 U Total 100 k 2 max U k 2 U 1 100 Total harmonic current distortion Ithd k 2 max I k 2 I Total 100 k 2 max I k 2 I 1 100 When the Denominator of the THD Equation Is the Total Value CSA When the Denominator of the THD Equation Is the Fundamental Wave IEC U k 2 k 1 max U Total I k 2 P k k 1 max I Total k 1 max P Total Note k denotes a harmonic order The upper limit of measured harmonic order is...

Page 112: ...ompanies is alternating current with sinusoidal waveforms The magnitude of alternating current can be expressed using values such as instantaneous maximum rms and mean values Normally it is expressed using rms values The instantaneous value i of a sinusoidal alternating current is expressed by Imsinωt where Am is the maximum value of the current ω is the angular velocity defined as ω 2πf and f is ...

Page 113: ...age u Umsinωt Current i Imsin ωt Φ The time offset between the voltage and current is called the phase difference and Φ is the phase angle The time offset is mainly caused by the load that the power is supplied to In general the phase difference is zero when the load is purely resistive The current lags the voltage when the load is inductive is coiled The current leads the voltage when the load is...

Page 114: ...d is connected in a delta wiring configuration and no neutral line is present the phase voltage cannot be measured In this case the line voltage is measured Sometimes the line voltage is also measured when measuring three phase AC power using two single phase wattmeters the two wattmeter method If the magnitude of each phase voltage is equal and each phase is offset by 120 the magnitude of the lin...

Page 115: ...ing on the phase difference Φ The section above the horizontal axis in the figure below represents positive power power supplied to the load and the section below the horizontal axis represents negative power power fed back from the load The difference between the positive and negative powers is the power consumed by the load As the phase difference between the voltage and current increases the ne...

Page 116: ...ction S UI VA P UIcosΦ W cosΦ is called the power factor and is expressed as λ It indicates the portion of the apparent power that becomes true power Reactive Power If current I lags voltage U by Φ current I can be broken down into a component in the same direction as voltage U IcosΦ and a perpendicular component IsinΦ Active power P which is equal to UIcosΦ is the product of voltage U and the cur...

Page 117: ...quency that is an integer multiple twice or more of the fundamental frequency Harmonic distortion factor The ratio of the rms value of the specified nth order harmonic contained in the distorted wave to the rms value of the fundamental wave or all signals Harmonic order The integer ratio of the harmonic frequency with respect to the fundamental frequency Total harmonic distortion The ratio of the ...

Page 118: ...tance and is defined as XL ωL The unit of inductive reactance is Ω Inductance works to counter current changes increase or decrease and causes the current to lag the voltage L I U U I π 2 i u π 2 Capacitance The current i when an AC voltage whose instantaneous value u Umsinωt is applied to capacitance C F is expressed by the equation below i Um XC sin ωt sin ωt π 2 Im π 2 Expressed using rms value...

Page 119: ...actance XS and impedance Z is expressed by the equations below Z RS 2 XS 2 XS XL XC Parallel RLC Circuits The equations below express the current relationships when resistance RP Ω inductance L H and capacitance C F are connected in parallel I IRP 2 IL IC 2 U IRPXP RP 2 XP 2 Φ tan 1 RP XP RP U 2 XL U XC U 2 RP 1 2 XL 1 XC 1 2 U RP 1 2 XP 1 2 U RP L C I IRP IL IC U U IC IL I IRP Φ The relationship ...

Page 120: ...A 15 000 75 000 mW 150 00 mW 300 00 mW 750 00 mW 1 5000 W 3 0000 W 30 000 150 00 mW 300 00 mW 600 00 mW 1 5000 W 3 0000 W 6 0000 W 60 000 300 00 mW 600 00 mW 1 2000 W 3 0000 W 6 0000 W 12 000 W 150 00 750 00 mW 1 5000 W 3 0000 W 7 5000 W 15 000 W 30 000 W 300 00 1 5000 W 3 0000 W 6 0000 W 15 000 W 30 000 W 60 000 W 600 00 3 0000 W 6 0000 W 12 000 W 30 000 W 60 000 W 120 00 W When the Crest Factor ...

Page 121: ...00 00 W 600 00 W 1 5000 kW 3 0000 kW 6 0000 kW 12 000 kW 600 00 600 00 W 1 2000 kW 3 0000 kW 6 0000 kW 12 000 kW 24 000 kW When the Crest Factor Is Set to 6 or 6A Voltage Range Current Range V 500 00 mA 1 0000 A 2 5000 A 5 0000 A 10 000 A 20 000 A 7 5000 3 7500 W 7 5000 W 18 750 W 37 500 W 75 000 W 150 00 W 15 000 7 5000 W 15 000 W 37 500 W 75 000 W 150 00 W 300 00 W 30 000 15 000 W 30 000 W 75 00...

Page 122: ... 900 00 W 1 8000 kW 4 5000 kW 9 0000 kW 18 000 kW 600 00 900 00 W 1 8000 kW 3 6000 kW 9 0000 kW 18 000 kW 36 000 kW When the Crest Factor Is Set to 6 or 6A Wiring System Voltage Range Current Range V 250 00 mA 500 00 mA 1 0000 A 2 5000 A 5 0000 A 10 000 A Single phase two wire 7 5000 1 8750 W 3 7500 W 7 5000 W 18 750 W 37 500 W 75 000 W 1P2W 15 000 3 7500 W 7 5000 W 15 000 W 37 500 W 75 000 W 150 ...

Page 123: ...t to current an integer multiple of the period of the current becomes the measurement period By averaging the sampled data in this measurement period this instrument computes the measured values such as U I and P Deciding Whether to Use Voltage or Current Input as the Synchronization Source Select input signals with stable input levels and frequencies with little distortion as synchronization sour...

Page 124: ...e Synchronization Source Cannot Be Detected If the total number of rising and falling zero crossings on the input signal that has been set as the synchronization source is less than two within the data update interval the period cannot be detected Also the period cannot be detected if the AC amplitude is small For information on the detectable frequency levels see the conditions listed under Accur...

Page 125: ...if the period of the AC signal cannot be detected accurately Change the synchronization source to a signal that allows for more stable detection of the period switch from voltage to current or from current to voltage The frequency detection circuit is AC coupled Even with AC signals in which there are no zero crossings because of an offset the period can be detected if the AC amplitude is greater ...

Page 126: ...M WT310E 01EN Measurement period Data update interval Data update interval Measurement period Synchronization source OFF Unintended zero crossing caused by pulse noise Appendix 4 Setting the Measurement Period ...

Page 127: ...urement It is an error that is included at a given magnitude in the measured values The range error that is included is of the same magnitude regardless of whether the measured value is large or small Input signal Measured value error error Reading error Input signal error error Range error Input signal error error Reading error range error Measured value Measured value 0 0 0 To see how much error...

Page 128: ... errors which is 0 001 A This corresponds to 0 2 of the measured value When we compare this result with that of example 1 we notice the following The reading error has been reduced in accordance with the input amplitude The range error has not changed As a result the error is 0 2 which is slightly larger than 0 15 of example 1 This is also because the measurement range is large relative to the inp...

Page 129: ...t power is 80 00 VA the error in the measured power 0 00 W is as follows 80 00 0 1 0 08 W When the Power Factor Is Greater Than 0 but Less Than 1 As an example let us calculate the error for when the power factor is 0 5 or in other words when the phase difference between the voltage and current Φ is 60 Voltage measurement range 150 V measured voltage 100 00 V Current measurement range 1A measured ...

Page 130: ... 150 Three phase current IΣ measurement range I1 measurement range I3 measurement range 2 1 1 2 1 The reading error and range error included in the measured three phase voltage UΣ 100 00 V are as follows Reading error 100 00 V 0 1 0 1 V Range error 150 V 0 05 0 075 V The error included in 100 00 V is the sum of the reading and range errors which is 0 175 V This corresponds to 0 175 of the displaye...

Page 131: ... when 1 00 V is measured three times Voltmeter A Voltmeter B 1st measurement 1 02 V 1 04 V 2nd measurement 1 00 V 1 05 V 3rd measurement 0 98 V 1 06 V Voltmeter A measurements are closer to the true value 1 00 V So we can say that voltmeter A is more accurate than voltmeter B On the other hand the three voltmeter B measurements are closer to each other than those of voltmeter A So we can say that ...

Page 132: ...F o F F o n o A t A d P u t E S E L A C S F F o Scaling Measurement display Press HOLD ESC while the menu is displayed to return to the measurement display P u t E S o i t A r option P u t E S C n Y S F F o P u t E S C n Y S Measurement period P u t E S t L i F L F F o F F o n o P u t E S t L i F L F F o Line filter To F FiLt on the next page F FiLt Sensor conversion ratio Set V C and F 0 0 0 1 V ...

Page 133: ... V A P u t E S n i L G V A 8 Averaging P u t E S H t A M P u t E S H T A M MATH function To SCALE on the previous page To L FiLt on the previous page F F o F F o F F o n o E P Y t F C 1 u F C 1 i A b 2 A 2 b V A 1 P n i L P E A b A b A b A b 1 u F C P u t E S Auto P u t E S 1 5 E t A r u E t A r u C n Y S 0 1 0 2 1 u 1 i Not Auto 1 0 5 2 0 5 0 1 2 5 0 1 0 2 o t u A P u t E S E t A r u o t u A 1 u ...

Page 134: ...F o P u t E S C n Y S H C A E 0 0 0 5 0 0 0 5 0 0 0 5 P u t E S t L i F L F F o F F o n o P u t E S t L i F L F F o P u t E S A t A d L L A ELEMENT1 ELEMENT2 ELEMENT3 To F FiLt on the next page Measurement period Line filter Measurement display Press HOLD ESC while the menu is displayed to return to the measurement display option Sensor conversion ratio L L A 1 L E L L A 0 0 0 1 V 0 0 0 1 C 0 0 0 ...

Page 135: ... F F o i F F E i F F E F F o F F o n o E P Y t i F F C 1 u F C 2 u F C 3 u F C 1 i F C 2 i F C 3 i A b A b A b A b A b 2 A 2 b V A 1 P V A 2 P V A 3 P V A 4 P WT333E WT333E WT333E n i L P E Frequency filter Averaging MATH function t u o i t 1 1 u Data update interval P u t E S Auto P u t E S 1 5 E t A r u E t A r u C n Y S 0 1 0 2 1 u 1 i 2 u 2 i 3 u 3 i 1 WT333E 2 WT332E WT333E 1 0 5 2 0 5 0 1 2 ...

Page 136: ...i t 0 M 0 S H 0 0 0 Set h M and S HARMONICS Menu Option 1 to 50 F F o n o Display Measurement display Press HOLD ESC while the menu is displayed to return to the measurement display PLL source Measured harmonic order t E S M r P S i d F F o H t E S M r C r S L 1 u H L P t E S M r r E d r 0 5 H o THD equation t E S M r d H t C E i H t E S M r P S i d F F o H t E S M r C r S L 1 u H L P t E S M r r ...

Page 137: ... i F 3 E L i F 4 E INTERFACE Menu 0 3 t W 0 0 2 t W 0 0 3 t W 0 E GP IB Measurement display Press HOLD ESC while the menu is displayed to return to the measurement display F i 2 3 2 S r RS 232 USB option F i b i P G A 1 r d d F i b S u X X 9 9 9 9 9 9 9 F i r E h t E 2 1 0 1 8 6 2 0 2 Format Baud rate Terminator Handshaking 0 r o F 1 d n A H 0 0 6 9 B F L r C F i b i P G A 1 r d d Ethernet IP addr...

Page 138: ... while the menu is displayed to return to the measurement display Measurement display o F n i i H L i t u t i n i o n L i t u F C 3 L i t u o S E r i H H L o M 1 F F u S 2 F F u S o n r E V d 1 C 1 F F u S o F n i 1 X E 7 C 4 A d 5 G 2 F F u S o F n i X X 9 9 9 9 9 9 9 o n o F n i 1 0 1 r E V o F n i Suffix code 1 2 Instrument number Firmware version Suffix code 2 2 L E d o M H o F n i 0 1 3 E t W...

Page 139: ... n n t L F d i t L F d L SE intVL L i t u L i t u E r o t S E G n A r u N E M L V t n i 0 0 0 0 0 0 F F o L i t u E G n A r F F o MEnu ConFiG Ethernet D A output G i F n o C P C H d F F o d n i b C E X E S r d A P i 2 1 0 1 5 0 1 2 0 2 bind dHCP iP AdrS MASK GAtE SEL A d 1 u 1 h c ch A d 1 u 1 h c End h c d n E Self test L i t u t S E t End L i t u t S E t Y r o M E M Y o M E M r L n A P E d L E d...

Page 140: ... The input circuits are mutually isolated They are also isolated from the case The voltage signal that is applied to the voltage input terminal VOLTAGE is normalized using the voltage divider and the operational amplifier op amp of the voltage input circuit It is then sent to a voltage A D converter The current input circuit is equipped with two types of input terminals a current input terminal CU...

Page 141: ...to the CPU Various computed values are determined from the measured values by the CPU The measured values and computed values are displayed and transmitted as D A and communication output as measurement functions of normal measurement The harmonic measurement functions option are derived in the following manner The voltage signal sent to the A D converter is converted to digital values at a sampli...

Page 142: ...pp 8 PLL source 1 17 6 6 power App 6 power coefficient 1 9 2 14 power factor 4 3 power factor error App 23 power factor influence App 23 power range 1 8 2 8 App 22 Index Symbols Page Σ functions 1 4 1P2W 2 3 1P3W 2 3 3P3W 2 3 3P4W 2 3 3V3A 2 3 A Page active power 4 1 App 10 apparent power 4 3 attenuation constant 2 25 auto range 1 7 2 7 average active power 1 14 4 8 average count 2 25 averaging 1 ...

Page 143: ...ystem 2 3 single phase two wire system 2 3 standard integration mode 1 16 5 2 START 5 6 star wiring App 8 STOP 5 6 storage 1 18 7 1 storage interval 7 1 suffix code 8 1 synchronization source 2 18 2 22 App 17 system information 8 1 T Page THD 6 5 THD equation 6 6 three phase four wire system 2 3 three phase three wire system 2 3 three voltage three current method 2 3 timeout 2 22 total harmonic di...

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