YOKOGAWA WT1800 User Manual
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YOKOGAWA WT1800 User Manual

Precision power analyzer
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WT1800
Precision Power Analyzer
Features Guide
IM WT1801-01EN
2nd Edition

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Summary of Contents for YOKOGAWA WT1800

  • Page 1 WT1800 Precision Power Analyzer Features Guide IM WT1801-01EN 2nd Edition...
  • Page 2 Thank you for purchasing the WT1800 Precision Power Analyzer. This manual contains useful information about the features of the WT1800. To ensure correct use, please read this manual thoroughly before beginning operation. After reading the manual, keep it in a convenient location for quick reference whenever a question arises during operation.

  • Page 3: Table Of Contents

    Contents Items That This Instrument Can Measure Measurement Functions Used in Normal Measurement............... 1-1 Harmonic Measurement Functions (Option) ................. 1-3 Delta Computation Functions (Option)..................1-5 Motor Evaluation Functions (Option) .................... 1-5 Auxiliary Input Measurement Functions (Option) ................1-5 High Speed Data Capturing (Option) .................... 1-5 What Is a Measurement Function? ....................
  • Page 4 Contents Motor Evaluation Conditions (Option) Motor Evaluation Conditions and Auxiliary Input Conditions (MOTOR/AUX SET) ....... 4-1 Scaling Factor (Scaling) ........................ 4-1 Unit (Unit) ............................4-2 Input Signal Type (Sense Type) ....................4-2 Analog Input Range ........................4-3 Linear Scaling of Analog Input ...................... 4-3 Line Filter (Line Filter) ........................
  • Page 5 Contents Computation Computation (MEASURE) ......................8-1 User-Defined Functions (User Defined Function) ................. 8-1 Measuring the Average Active Power ................... 8-5 MAX Hold (Max Hold) ........................8-5 User-Defined Events (User Defined Event) .................. 8-6 Apparent Power, Reactive Power, and Corrected Power Equations (Formula) ......8-8 Sampling Frequency (Sampling Frequency).................
  • Page 6 Contents Vector Display (Option) Vector Display (OTHERS (Vector)) ..................... 13-1 Display Format (FORM) ......................13-2 Display Item (ITEM) ........................13-2 Split Display Split Display (OTHERS) ......................14-1 Split Displays with the Numeric Display (Numeric+***) ............... 14-1 Split Displays with the Waveform Display (Wave+***) ..............14-1 Split Displays with the Trend Display (Trend+***) ...............
  • Page 7 Contents Saving and Loading Data Storage Media..........................18-1 Saving Setup Data (Save Setup) ....................18-2 Saving Waveform Display Data (Save Wave) ................18-2 Saving Numeric Data (Save Numeric) ..................18-2 File Save Conditions ........................18-3 Loading Setup Data (Load Setup) ....................18-5 File Operations (Utility) .......................

  • Page 8: Items That This Instrument Can Measure

    The input elements and wiring units referred to in each measurement function table are listed below. However, the input elements and wiring units that you can measure vary depending on how many input elements are installed in the WT1800. • Input elements: Element1, Element2, Element3, Element4, Element5, Element6 •...
  • Page 9 1 Items That This Instrument Can Measure Integrated Power (Watt hours) Function Description Input Element Wiring Unit Time Integration time Sum of positive and negative watt hours Sum of positive P values WP− Sum of negative P values Sum of positive and negative ampere hours Sum of positive I values q−...

  • Page 10: Harmonic Measurement Functions (Option)

    1 Items That This Instrument Can Measure Harmonic Measurement Functions (Option) Function Description Input Element Wiring Unit U(k) Rms voltage of harmonic order k I(k) Rms current of harmonic order k P(k) Active power of harmonic order k S(k) Apparent power of harmonic order k Q(k) Reactive power of harmonic order k λ(k)
  • Page 11 1 Items That This Instrument Can Measure Harmonic Measurement Function Orders The harmonic orders that you can specify are indicated below. Input Element Harmonic Measurement Functions Measurement Characters or Numbers in Parentheses Function Total 0 (DC) U( ) 2 to 500 I( ) 2 to 500 P( )

  • Page 12: Delta Computation Functions (Option)

    1 Items That This Instrument Can Measure Wiring Unit Harmonic Measurement Functions (Σ functions) Measurement Characters or Numbers Function in Parentheses Total UΣ( ) IΣ( ) PΣ( ) SΣ( ) QΣ( ) λΣ( ) Functions with parentheses will produce different values depending on which of the following is contained in their parentheses.

  • Page 13: What Is A Measurement Function

    Element refers to a set of input terminals that can receive a single phase of voltage and current to be measured. The WT1800 can contain up to six elements, numbered from 1 to 6. An element number is appended to the measurement function symbol for the measured data that the WT1800 displays, so that you can tell which data belongs to which element.

  • Page 14: Fundamental Measurement Conditions

    Independent input element configuration (Element Independent) • Delta computation (Δ Measure; option) Wiring System (Wiring) There are five wiring systems available on the WT1800. The selectable wiring systems vary depending on the number of installed input elements. • 1P2W: Single-phase, two-wire system •...
  • Page 15 2 Fundamental Measurement Conditions Input Element Wiring system 1P2W combination Input Element Wiring system 1P2W 1P2W combination 1P3W or 3P3W:ΣA Input Element Wiring system 1P2W 1P2W 1P2W combination 1P3W or 3P3W:ΣA 1P2W 1P2W 1P3W or 3P3W:ΣA 3P4W or 3P3W:ΣA Input Element Wiring system 1P2W 1P2W...
  • Page 16 2 Fundamental Measurement Conditions Settings of Elements Grouped in a Wiring Unit independent input element configuration is off and a wiring system other than 1P2W is selected when the measurement range, valid measurement range, or valid synchronization source settings of each input element are different, these settings are changed in the manner described below: •...

  • Page 17: Efficiency Equation (Η Formula)

    2 Fundamental Measurement Conditions Efficiency Equation (η Formula) You can create an efficiency equation by combining measurement function symbols. The WT1800 can determine the energy conversion efficiency of the device using the numeric values of the measurement functions. η1 to η4 You can create four efficiency equations (η1 to η4), using the following measurement functions as operands.

  • Page 18: Independent Input Element Configuration (Element Independent)

    2 Fundamental Measurement Conditions Independent Input Element Configuration (Element Independent) In the wiring system settings, you can select whether to set the measurement range or sync source of input elements in the same wiring unit collectively or independently. Turning Independent Input Element Configuration On or Off For example, assume that the wiring system on a model with three input elements is set as follows: Input elements 1 to 3: Three-phase, four-wire system (3P4W).

  • Page 19: Delta Computation (Δ Measure; Option)

    2 Fundamental Measurement Conditions Delta Computation (Δ Measure; option) The sum or difference of the instantaneous voltage or current values (sampled data) between the elements in a wiring unit can be used to determine various types of data such as the differential voltage and phase voltage. This operation is called delta computation.
  • Page 20 2 Fundamental Measurement Conditions • Star-delta transformation (Star>Delta) You can use the data from a three-phase, four-wire system to compute the data of a delta connection from the data of a star connection. When you perform delta computation on wiring unit ΣA, the available measurement functions are as follows. ΔU1rms[UrsA], ΔU1mn[UrsA], ΔU1dc[UrsA], ΔU1rmn[UrsA], ΔU1ac[UrsA] ΔU2rms[UstA], ΔU2mn[UstA], ΔU2dc[UstA], ΔU2rmn[UstA], ΔU2ac[UstA] ΔU3rms[UtrA], ΔU3mn[UtrA], ΔU3dc[UtrA], ΔU3rmn[UtrA], ΔU3ac[UtrA]...

  • Page 21: Selecting An Element Whose Measurement Range You Want To Specify (Element)

    For details, see appendix 1 in the getting started guide, IM WT1801-03EN. • When only one element is installed in the WT1800, this feature cannot be used, and its settings do not appear.

  • Page 22: Selecting All Input Elements (All)

    WT1800 (approximately 2 Ms/S). • If the high frequency components of the pulse waveform attenuate due to the bandwidth limitations of the WT1800 measurement circuit, causing the waveform peak value to be less than the peak over- range detection level.

  • Page 23: Auto Voltage Range (Auto (V))

    2 Fundamental Measurement Conditions • To display a list of the range settings of all input elements, see “Displaying the Setup Parameter List.” You can change measurement ranges from the list. Click here. Auto Voltage Range (AUTO (V)) When you press AUTO, the AUTO key illuminates, and the range is set automatically. The measurement range is switched automatically depending on the amplitude of the input signal as described below.

  • Page 24: Current Range (Range Up/Down (A))

    2 Fundamental Measurement Conditions Current Range (RANGE UP/DOWN (A)) The current range can be fixed (when auto range is set to off) or determined automatically (when auto range is set to on). Fixed Ranges When the current range is fixed, you can select a range from the available options. The selected current range does not change even if the amplitude of the input signal changes.

  • Page 25: Power Range

    2 Fundamental Measurement Conditions Power Range The measurement ranges (power ranges) of active power (P), apparent power (S), and reactive power (Q) are as follows: Wiring System Power Range 1P2W (single-phase, two-wire system) Current range × voltage range 1P3W (single-phase, three-wire system) Voltage range ×...

  • Page 26: External Current Sensor Conversion Ratio (Sensor Ratio; Option)

    2 Fundamental Measurement Conditions External Current Sensor Conversion Ratio (SENSOR RATIO; option) Set the conversion ratio used to measure the signal received by the external current sensor input connector (EXT) from a current sensor that produces voltage. Set how many millivolts the current sensor transmits when 1 A of current is applied (conversion ratio).

  • Page 27: External Current Sensor Range Display Format (Direct/Measure; Option)

    • DIRECT (direct input value display) Values are displayed within the external current sensor range (voltage). This setting is useful when you want to set the external current sensor range using the voltage received by the WT1800 from the external current sensor as a guide.
  • Page 28 2 Fundamental Measurement Conditions Power Coefficient (SF Scaling; scaling factor) By setting the power coefficient (SF), you can display the measured active power, apparent power, and reactive power after they have been multiplied by a coefficient. Measurement Function Data before Transformation Transformation Result Voltage U...

  • Page 29: Valid Measurement Range (Config(V)/Config(A))

    200 mA, 500 mA, and 1 A ranges. When the device is in standby, the range will be 200 mA. When the device begins operating, the WT1800 will skip the intermediate 200 mA, 500 mA, and 1 A ranges and switch directly to the 2 A range.

  • Page 30: Crest Factor (Crest Factor)

    Rms value Peak value Rms value Input signal waveform On the WT1800, the crest factor is the ratio of the maximum applicable peak value to the measurement range. Peak value that can be input Crest factor (CF) = Measurement range You can set the crest factor to CF3 or CF6.

  • Page 31: Measurement Period (Sync Source)

    • When the data update interval is 500 ms, 1 s, 2 s, 5 s, 10 s, or 20 s: 8192 points The WT1800 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 are used to determine the values of harmonic measurement functions may be different from those used to determine the values of normal measurement functions.

  • Page 32: Line Filter (Line Filter)

    OFF, 100 Hz, and 1 kHz • The WT1800 detects the zero-crossing point with a hysteresis of approximately 5% of the measurement range. • If even one element is not set to OFF, the Freq Filter indicator at the top of the screen illuminates.

  • Page 33: Data Update Interval (Update Rate)

    Fast The WT1800 switches to the next fastest data update interval (out of the intervals listed above). Slow The WT1800 switches to the next slowest data update interval (out of the intervals listed above).
  • Page 34 2 Fundamental Measurement Conditions Averaging Types (Type) You can use exponential or moving averages. Exponential Averaging (Exp) With the specified attenuation constant, the numeric data is exponentially averaged according to the equation below. – D n–1 n–1 : Displayed value that has been exponentially averaged n times. (The first displayed value, D , is equal to M : Displayed value that has been exponentially averaged n –...

  • Page 35: Displaying The Setup Parameter List (Input Info)

    2 Fundamental Measurement Conditions Measurement Functions That Do Not Perform Averaging The following measurement functions do not perform averaging. Measurement Functions Used in Normal Measurement fU, fI, U+pk, U–pk, I+pk, I–pk, P+pk, P−pk, Time, WP, WP+, WP–, WPΣ, WP+Σ, WP–Σ, WS, WQ, and SyncSp (on models with the motor evaluation option) Measurement Functions Used in Harmonic Measurement (Option) ΦU(k), ΦI(k), ΦUi–Uj, ΦUi–Uk, ΦUi–Ii, ΦUj–Ij, ΦUk–Ik, fPLL1, fPLL2, EaU, and EaI...

  • Page 36: Harmonic Measurement Conditions (Option)

    3 Harmonic Measurement Conditions (Option) Harmonic Measurement Conditions (HRM SET) Using harmonic measurement, you can measure functions that are based on the voltage, current, and power harmonics and their distortion factors; on the phase angle of each harmonic relative to the fundamental; etc. You can also compute the harmonic distortion factors for voltage and current.

  • Page 37: Measured Harmonic Orders (Min Order/Max Order)

    • If the frequency of the PLL source changes, correct measured values are displayed four data updates after the change. Correct measured values may not be obtained immediately after the PLL source or its frequency changes, because the PLL circuit inside the WT1800 redetects the frequency. Measured Harmonic Orders (Min Order/Max Order) The harmonic measurement range can be specified.

  • Page 38: Distortion Factor Equation (Thd Formula)

    3 Harmonic Measurement Conditions (Option) Distortion Factor Equation (Thd Formula) When determining the harmonic measurement functions Uhdf, Ihdf, Phdf, Uthd, Ithd, and Pthd, you can select to use one of the denominators described below as the denominator for the equation. For information about equations, see appendix 1 in the getting started guide, IM WT1801-03EN.

  • Page 39: Anti-Aliasing Filter

    5 kHz, which are irrelevant to harmonic measurement. The WT1800 uses the line filter as an anti-aliasing filter for harmonic measurements. For information about how to configure the filter, see “Line Filter (LINE FILTER).”...

  • Page 40: Motor Evaluation Conditions (Option)

    You can configure the WT1800 to receive analog (DC voltage) signals or pulse signals from the revolution sensor and torque meter. Also, you can set the number of motor poles and determine the motor’s synchronous speed and slip.

  • Page 41: Unit (Unit)

    • Usable characters: Spaces and all characters that are displayed on the keyboard Input Signal Type (Sense Type) You can select which of the following two types of signals you want the WT1800 to receive from the revolution sensor and torque meter.

  • Page 42: Analog Input Range

    Turning Auto Range On and Off (Analog Auto Range) Select whether to turn auto range on or off. When auto range is on, the WT1800 automatically switches between the following ranges according to the size of the input signal.

  • Page 43: Line Filter (Line Filter)

    4 Motor Evaluation Conditions (Option) When There Is No Offset in the Input Voltages from the Revolution Sensor and Torque Meter If you set A to 1 and B to 0, the linear scaling settings do not affect computation, and the previous equation becomes: Rotating speed, torque = SX –...

  • Page 44: Synchronization Source (Sync Source)

    • The measurement period is determined according to the zero-crossing point of the selected synchronization source. The WT1800 uses the measurement period to measure the analog revolution and torque signals. If you specify no synchronization source by selecting “None,” all the sampled data within the data update interval is used to determine the rotating speed and torque.
  • Page 45 Torque input Output axis Pulse output Motor Load torque sensor Torque signal to the WT1800 Pulse signal corresponding to –20 N•m to +20 N•m WT1800 Recorder D/A output signal to the recorder ±5 V for –20 N•m to +20 N•m...

  • Page 46: Revolution Signal Pulses Per Revolution (Pulse N)

    4 Motor Evaluation Conditions (Option) The pulse input range setting applies to input signals whose type has been set to pulse. For input signals whose type has been set to analog, there is no need to configure this setting. Revolution signal pulses per revolution (Pulse N) Set the number of pulses per revolution to a value from 1 to 9999.

  • Page 47: Electrical Angle Measurement (Electrical Angle Measurement)

    Set the correction value to 0.00. Automatically Computing the Correction Value (Auto Enter Correction) The WT1800 automatically sets the correction value to the difference between the phase of the voltage or current whose correction value is being automatically computed and the current electrical angle phase.

  • Page 48: Motor Efficiency And Total Efficiency Computation

    4 Motor Evaluation Conditions (Option) Motor Efficiency and Total Efficiency Computation The WT1800 can compute the motor efficiency (the ratio of power consumption to motor output) and total efficiency from the active power and motor output that it measures. You can set the efficiency equation using the η...

  • Page 49: Auxiliary Input Conditions (Option)

    Set the auxiliary input (analog input) range. Turning Auto Range On and Off (Analog Auto Range) Select whether to turn auto range on or off. When auto range is on, the WT1800 automatically switches between the following ranges according to the size of the auxiliary input.

  • Page 50: Linear Scaling Of Analog Input

    5 Auxiliary Input Conditions (Option) Linear Scaling of Analog Input You can set the slope and the offset value of the auxiliary input using one of the following two methods. • Set the values manually. • Specify two points, and use those points to compute the values Manually Setting the Auxiliary Input Slope and Offset (Linear Scale A, B) You can set the slope (A) and offset (B) of the auxiliary input to values within the following ranges.

  • Page 51: Line Filter (Line Filter)

    5 Auxiliary Input Conditions (Option) Line Filter (Line Filter) You can remove high-frequency noise by inserting a line filter into the circuit used to measure the Aux1 and Aux2 auxiliary inputs. You can select the cutoff frequency from the following options. OFF, 100 Hz, and 1 kHz Selecting OFF disables the filter.

  • Page 52: Holding Measured Values And Performing Single Measurements

    6 Holding Measured Values and Performing Single Measurements Holding Measured Values (HOLD) The hold operation stops data measurement and display operations for each data update interval and holds the display of all measurement function data. The D/A output values, the values in the data lists printed by the built- in printer, and the communication values all reflect the held values.

  • Page 53: Numeric Data Display

    A table of numeric data is displayed with measurement functions listed vertically and symbols indicating elements and wiring units listed horizontally. The number of displayed items varies depending on the number of elements that are installed in the WT1800. IM WT1801-01EN...
  • Page 54 7 Numeric Data Display Single Harmonics List Display (Hrm List Single; option) • When the display mode is Numeric, up to 42 of the harmonic order data items of a single measurement function are displayed in two columns. • When the display is split, up to 22 of the harmonic order data items of a single measurement function are displayed in two columns.

  • Page 55: Switching The Displayed Page (Page Up

    7 Numeric Data Display Custom Display (Custom) You can use an illustration (.BMP) or picture (.BMP) from a PC or other device as the background of the display. You can arrange numeric data boxes on top of this background to create a custom display. Numeric data appears in this custom display.

  • Page 56: Number Of Displayed Digits (Display Resolution)

    7 Numeric Data Display Number of Displayed Digits (Display Resolution) The number of displayed digits (display resolution) for voltage, current, active power, apparent power, reactive power, and so on is as follows: • If the value is less than or equal to 60000: Five digits. •...

  • Page 57: 8-, And 16-Value Displays (4 Items/8 Items/16Items)

    7 Numeric Data Display Notes about the Numeric Data Display • “-------” is displayed if a measurement function is not selected or if there is no numeric data. • If Urms, Umn, Udc, Urmn, Uac, Irms, Imn, Idc, Irmn, or Iac exceeds 140% of the measurement range, “-OL-” is displayed to indicate an overload value.
  • Page 58 7 Numeric Data Display Element (Element/Σ) • You can select the element/wiring unit from the options below. The available options vary depending on the installed elements. Element1, Element2, Element3, Element4, Element5, Element6, ΣA, ΣB, and ΣC • If the selected wiring unit does not have any elements assigned to it, because there is no data, “-------” (no data) is displayed.

  • Page 59: Matrix Display (Matrix)

    7 Numeric Data Display Matrix display (Matrix) Item Number to Set (Item No.) This is the same as setting the item number in the 4-, 8-, and 16-value displays. Click here. Function (Function) This is the same as setting the function in the 4-, 8-, and 16-value displays. Click here.

  • Page 60: All Items Display (All Items)

    7 Numeric Data Display All Items Display (All Items) You cannot change individual measurement functions. Change the display by pressing PAGE UP and PAGE DOWN or the up and down cursor keys. The number of displayed pages varies as indicated below depending on the installed options. Harmonic Measurement Option or Simultaneous Dual Harmonic Measurement Option Installed...

  • Page 61: Single Harmonics And Dual Harmonics Lists (Hrm List Single/Dual; Option)

    7 Numeric Data Display Single Harmonics and Dual Harmonics Lists (Hrm List Single/ Dual; option) For each measurement function, you can display the numeric data for a harmonic order from 0 (DC) to 500 or for all harmonic orders in two columns. This item is available on models with the harmonic measurement option or the simultaneous dual harmonic measurement option.

  • Page 62: Custom Display (Custom)

    • After you properly load a display configuration file and a background file, if you restart the WT1800 and the same background file is not in the same location, the background will return to its default.
  • Page 63 7 Numeric Data Display Customizing the Displayed Items (Custom Items) • Item Number to Set (Item No.) Select the number of the item that you want to configure. • Function (Function) This is the same as setting the function in the 4-, 8-, and 16-value displays. Click here.
  • Page 64 7 Numeric Data Display Saving the Display Configuration (Save Custom Items) You can save the display configuration that you have created to the specified storage medium. The extension is .TXT. • Displaying a File List and Specifying the Save Destination (File List) On the file list, specify the save destination.

  • Page 65: Computation

    8 Computation Computation (MEASURE) You can set the following items. • User-defined functions (User Defined Function) • Measuring the Average Active Power • MAX hold (Max Hold) • User-defined events (User Defined Event) • Apparent power, reactive power, and corrected power equations (Formula) •...
  • Page 66 8 Computation Expression (Expression) Operation Type You can use combinations of measurement functions and element numbers (e.g., Urms1) as operands to configure up to 20 equations (F1 to F20). There can be up to 16 operands in 1 equation. The different types of operands are listed below (measurement function: operand). •...
  • Page 67 8 Computation • Delta Computation (Option) Δ Δ Δ U1( ): DELTAU1( ) I( ): DELTAI( ) P1( ): DELTAP1( ) Δ Δ ––– U2( ): DELTAU2( ) P2( ): DELTAP2( ) Δ ––– Δ U3( ): DELTAU3( ) P3( ): DELTAP3( ) Δ...
  • Page 68 8 Computation Values Substituted in Operands • The unit of TI values is seconds. • η1 to η4 are displayed as percentages (see in appendix 1 in the getting started guide, IM WT1801-03EN). However, in this section ETA1 to ETA4 are described as ratios. Example When η1 is 80%, ETA1 is 0.8 •...

  • Page 69: Measuring The Average Active Power

    • The D/A output values, the values in the data lists printed by the built-in printer, and the communication values all reflect the held maximum values. • When MAX hold is applied to measurement functions that have positive and negative values, the WT1800 compares the absolute values to determine the maximum value.

  • Page 70: User-Defined Events (User Defined Event)

    8 Computation User-Defined Events (User Defined Event) User-defined events can be used to trigger data storage and automatic printing (option). You can define up to eight user-defined events. User-Defined Event Number (Event No.) Select a user-defined event number from 1 to 8. Turning User-Defined Events On and Off Select whether to enable user-defined events.
  • Page 71 8 Computation For example, a condition that is true when 150 < the measured power value of element 1 < 160 W and false otherwise would be configured as shown below. Condition (Condition) Specify the judgment condition here when you have set the judgment condition specification method to Condition.

  • Page 72: Apparent Power, Reactive Power, And Corrected Power Equations (Formula)

    Because the equations for deriving the apparent and reactive power for distorted waveforms are not defined, none of the equations can be said to be more correct than the other. Therefore, the WT1800 provides three equations, Type 1 to Type 3, for determining the apparent power and reactive power.

  • Page 73: Sampling Frequency (Sampling Frequency)

    Type 3 (The method used in the harmonic measurement modes of the WT1600, WT3000 and PZ4000) The WT1800 calculates the reactive power of each phase using equation 2 and calculates the three-phase apparent power using equation 4. This equation is available on models with the harmonic measurement option or the simultaneous dual harmonic measurement option.

  • Page 74: Phase Difference Display Format (Phase)

    Connect the external start signal input/output connectors (MEAS. START) of the master and slave instruments using a BNC cable (sold separately). You can synchronize the measurement of two WT1800s making one WT1800 the master and the other WT1800 the slave. The master outputs a measurement start signal, and the slave receives the signal.

  • Page 75: Voltages Or Currents Whose Frequencies Will Be Measured (Freq Measure)

    8 Computation Voltages or Currents Whose Frequencies Will Be Measured (FREQ MEASURE) Select the three voltages or currents to measure the frequencies of from the options below. The available options vary depending on the installed elements. U1, I1, U2, I2, U3, I3, U4, I4, U5, I5, U6, and I6 On models with the add-on frequency measurement option, the frequencies of the voltages and currents of all elements can be measured, so there is no need to set which frequencies to measure.

  • Page 76: Integrated Power (Watt Hours)

    • The integrated value reaches its maximum or minimum displayable value. • A power failure occurs when integration is in progress. Even when a power failure occurs, the WT1800 stores and holds the integration result. When the power returns, integration is stopped, and the integration result calculated up to the point when the power failure occurred is displayed.

  • Page 77: Number Of Displayed Digits (Display Resolution)

    • The integrated value of WP, q, WS, or WQ reaches the maximum or minimum displayable value given above. Integration When the MAX Hold Feature Is Enabled The WT1800 determines and displays the integrated value by summing the value that is measured at every data update interval, irrespective of the MAX hold feature.
  • Page 78 9 Integrated Power (Watt hours) Sample Rate, and Valid Frequency Ranges for Integration The sample rate is approximately 2 MHz. The voltage/current signal frequencies that are valid for integration are as follows: Integrated Item Valid Frequency Range for Integration Active power DC to approximately 1 MHz Current When integrating Irms...

  • Page 79: Enabling Or Disabling Independent Integration (Independent Control)

    9 Integrated Power (Watt hours) Enabling or Disabling Independent Integration (Independent Control) You can select whether to start, stop, and reset integration on all elements simultaneously or separately. • OFF: Integration starts, stops, and is reset simultaneously on all elements. •...

  • Page 80: Starting, Stopping, And Resetting Integration (Start/Stop/Reset)

    • When integration starts, the START indicator to the right of the INTEG key illuminates, and the integration status indication is “Start.” • When the WT1800 is in an integration-ready state, the START indicator blinks, and the integration status indication is “Ready.”...
  • Page 81 9 Integrated Power (Watt hours) Resetting Integration (Reset) The integration time and integrated value are reset. The STOP indicator turns off. The displays for integration- related functions change to “-----------” (no data). When an integration error occurs, the START and STOP indicators blink, and the integration status indication is “Error.”...

  • Page 82: Integration Conditions (Integ Set)

    When you set the integration mode to normal integration mode (Normal) and set the integration timer to 00000:00:00, the WT1800 performs integration in manual integration mode. After integration is started, it continues until you press Stop. However, if either of the conditions below is met, integration is stopped, and the integration time and integrated value are held.
  • Page 83 9 Integrated Power (Watt hours) Normal Integration Mode (Normal) You can set a relative integration time (set a timer). Integration starts when you press Start. When one of the conditions below is met, integration is stopped, and the integration time and integrated value are held. •...
  • Page 84 9 Integrated Power (Watt hours) Real-Time Normal Integration Mode (R–Normal) Set the date and time when integration starts and stops and the duration of integration. Integration starts at the scheduled start time. When one of the conditions below is met, integration is stopped, and the integration time and integrated value are held.

  • Page 85: Integration Timer (Integ Timer)

    WT1800 enters into an integration-ready state, the numeric data may not be updated immediately. This is because the numeric data is updated in sync with the WT1800 clock. This ensures that the numeric data is updated at the same time as the scheduled integration start time and that the integration time is accurate.

  • Page 86: Integration Auto Calibration On/Off (Auto Cal)

    9 Integrated Power (Watt hours) Integration Auto Calibration On/Off (Auto Cal) Ordinary zero-level compensation takes place when the measurement range or line filter is changed, but you can also automatically calibrate the zero level during integration. • ON: Zero-level compensation takes place approximately once every hour during integration. •...

  • Page 87: Rated Time Of Integrated D/A Output (D/A Output Rated Time; Option)

    9 Integrated Power (Watt hours) Rated Time of Integrated D/A Output (D/A Output Rated Time; Option) This setting appears on models with the 20-channel D/A output option. When integrated values are output through output, a rating value (the same value as the measurement range) is continuously applied, the integrated value after the specified amount of time has elapsed is taken to be 100%, and the D/A output at that point is 5 V.

  • Page 88: Waveform Display

    10 Waveform Display Waveform Display (WAVE) You can press WAVE to make the waveform displays of the following types of input signals. • Input element voltage and current • Motor evaluation function (option) speed and torque • Auxiliary inputs (option) Aux1 and Aux2 Each time you press WAVE, the number of split screens switches in order between none, 2, 3, 4, and 6.

  • Page 89: Display Format (Form)

    10 Waveform Display Display Format (FORM) You can configure the following display format settings. • Number of windows (Format) • Time axis (Time/div) • Trigger (Trigger Settings) • Advanced waveform display settings (Display Settings) • Waveform mapping (Wave Mapping) Number of Windows (Format) You can divide the screen equally into windows, and assign waveforms to those windows.
  • Page 90 • Waveform sampling data: Data derived through A/D conversion of the input signal The WT1800 A/D conversion rate is approximately 2 MS/s. Therefore, if the data update interval is set to 1 s, the number of data points sampled from a single input signal in a single measurement is approximately 2,000,000 (see the figure below).

  • Page 91: Vertical Axis (Amplitude)

    10 Waveform Display Aliasing When the sample rate is low compared to the frequency of the input signal, the high frequency components of the signal are lost. In accordance with the Nyquist sampling theorem, the high frequency components in the signal are misread as low frequency components.

  • Page 92: Trigger (Trigger Settings)

    The WT1800 only updates the waveform display when the trigger conditions are met. If no triggers occur, the display is not updated. If you want to view waveforms that the WT1800 cannot trigger on, or if you want to check the ground level, use Auto mode.
  • Page 93 10 Waveform Display Trigger level Trigger source The WT1800 triggers here (the trigger point) when the trigger edge is set to rising ( ). • Measurement range: 100 Vrms or 50 Vrms when the crest factor is set to CF3 or CF6, respectively.

  • Page 94: Advanced Waveform Display Settings (Display Settings)

    The spaces between vertically aligned dots are filled. If the number of data points is 1602 or greater, the WT1800 determines the P-P compression values (the maximum and minimum sampled-data values in a given interval), and displays vertical lines (rasters) connecting each pair of maximum and minimum P-P compression values.

  • Page 95: Waveform Mapping (Wave Mapping)

    10 Waveform Display Waveform Mapping (Wave Mapping) Assignment Method (Mode) You can assign waveforms to windows on the screen. Choose one of the following methods for assigning the waveforms to the windows. • Auto The waveforms whose displays are turned on are assigned in order according to their element numbers, with an element’s voltage waveform (U) coming first, followed by its current (I), speed, torque, Aux1, and then 1, 2 Aux2 waveform.
  • Page 96 10 Waveform Display Vertical Position (Vertical Position) You can vertically shift the displayed position (vertical position) of a waveform. This is useful when you want to view the relationship between voltage and current waveforms, or when the section of the waveform that you want to view does not fit into the display frame.

  • Page 97: Trend Display

    11 Trend Display Other Displays (OTHERS) You can press OTHERS to make the following displays appear. • Trend display (Trend) • Bar graph display (Bar) • Vector display (Vector) • Split display (with the numeric value display; Numeric+***) • Split display (with the waveform display; Wave+***) •...

  • Page 98: Display Format (Form)

    11 Trend Display Display Format (FORM) Number of Trend Display Windows (Format) You can choose the number of windows from one of the following options: • Single: No windows • Dual: Two windows • Triad: Three windows • Quad: Four windows Depending on the number of windows, the number of displayed points in each window changes as described below.

  • Page 99: Display Item (Item)

    11 Trend Display Display Item (ITEM) Turning Trend Displays On and Off Display (The upper left of the list) You can set whether to display (All ON) or hide (All OFF) all trends, from trend 1 (T1) to trend 16 (T16). Trend Numbers (T1 to T16) You can select whether to display each trend, from trend 1 (T1) to trend 16 (T16), by selecting or clearing its check box.

  • Page 100: Bar Graph Display (Option)

    12 Bar Graph Display (Option) Bar Graph Display (OTHERS (Bar)) On models with the harmonic measurement option or the simultaneous dual harmonic measurement option, you can display harmonics using bar graphs. The harmonic orders are lined up on the horizontal axis, and the vertical axis represents the amplitude of each harmonic.

  • Page 101: Display Item (Item)

    12 Bar Graph Display (Option) Bar Graph Display Range (Start Order/End Order) • You can configure the range of harmonic orders to show in a bar graph. • The range is the same for bar graphs 1 to 3. Starting Harmonic Order (Start Order) •...

  • Page 102: Vector Display (Option)

    13 Vector Display (Option) Vector Display (OTHERS (Vector)) On models with the harmonic measurement option or the simultaneous dual harmonic measurement option, you can select a wiring unit to display vectors of the phase differences and amplitudes (rms values) of the fundamental signals, U(1) and I(1), in each element in the unit.

  • Page 103: Display Format (Form)

    13 Vector Display (Option) Display Format (FORM) Number of Vector Display Windows (Format) You can choose the number of windows from one of the following options: • Single: No windows. The data of vector (Item No.) 1 is displayed. • Dual: Two windows. The data of vectors (Item No.) 1 and 2 is displayed. However, in the split display, the data of vector 1 is displayed.

  • Page 104: Split Display

    14 Split Display Split Display (OTHERS) You can split the screen into top and bottom halves, and select a display to show in each half. You can select the following items. • Split displays with the numeric display (Numeric+***) • Split displays with the waveform display (Wave+***) •...

  • Page 105: Cursor Measurement

    15 Cursor Measurement Cursor Measurement (CURSOR) You can place cursors on displayed waveforms, trends, and bar graphs and display the values at the cursor locations. Example of cursors in the waveform display Cursor 2 Cursor 1 You can set the following items. •...

  • Page 106: Cursor Path (Cursor Path)

    15 Cursor Measurement Cursor Path (Cursor Path) Because the WT1800 uses P-P compression on sampled data, two values (a maximum and a minimum value) are displayed at each time-axis point. You can choose the path that the cursors move through and the data points that are measured by the cursors from one of the options below.
  • Page 107 15 Cursor Measurement In the Trend Display The vertical-axis (Y-axis) value of cursor 1 (+) The vertical-axis (Y-axis) value of cursor 2 (x) ΔY The difference between the vertical-axis (Y-axis) values of cursor 1 (+) and cursor 2 (x) The horizontal-axis (X-axis) value of cursor 1 (+) With the left edge of the screen being 0 seconds, the time from the left edge of the screen is indicated.

  • Page 108: Cursor Movement

    15 Cursor Measurement Cursor Movement In the Waveform Display • Cursors move along the selected waveform. • The unit of cursor movement is the amount of time contained in one screen ÷ 800. • If immeasurable data exists, “***” is displayed in the measured value display area. •...

  • Page 109: 16 High Speed Data Capturing

    High Speed Data Capturing State • Ready • “Ready” appears when high speed data capturing has been reset and the WT1800 is ready to begin high speed data capturing. • When the number of data captures has been set to a value other than Infinite, the number of data captures appears to the right of Count.

  • Page 110: Measurement Functions

    “Stop” appears when the WT1800 has finished recording to a file and when recording to a file is stopped. • Error • When a write error occurs while the WT1800 is recording to a file, the WT1800 stops recording to the file, and “Error” appears.
  • Page 111 • When External Sync is set to ON: The interval at which data is captured depends on the sync signal that is applied to the external start signal I/O (MEAS START) connector. The WT1800 can sync with a signal whose period is 1 ms to 100 ms.

  • Page 112: High Speed Data Capturing (Hs) Settings (Form)

    The number of captures can be set to infinity or to a value from 1 to 10000000. Viewing and Optimizing the Maximum Capturing Count (Optimize Count) • The WT1800 computes the maximum capturing count for the save destination of the captured data file according to the number of numeric data items specified in Item Settings.

  • Page 113: Capture Control Settings (Control Settings)

    16 High Speed Data Capturing Capture Control Settings (Control Settings) Voltage and Current Measurement Modes (U/I Measuring Mode) Select the modes for measuring voltage and current. Setting Select the method for setting the voltage and current measurement modes from the following options. •...
  • Page 114 • To synchronize multiple WT1800s and perform high speed data capturing, synchronize a WT1800 on which External Sync has been set to ON to a WT1800 on which External Sync has been set to OFF. When you synchronize the WT1800s, make sure that they are set to the same number of data captures.

  • Page 115: Recording To A File (Record To File)

    16 High Speed Data Capturing Recording to a File (Record to File) • If you set Record to File to ON, when high speed data capturing starts, the WT1800 saves the following two files in binary format. • High speed data capturing data file (.WTS): The measured data is saved to this file.

  • Page 116: Save Conditions (File Settings)

    A CSV file is saved in the same folder as the high speed data capturing data file. The WT1800 will not create a CSV file whose size exceeds 2 GB but will instead create a CSV file for 2 GB worth of captured data.

  • Page 117: Starting And Stopping High Speed Data Capturing (Start/Stop)

    • If the trigger mode is set to OFF, data is captured. • If the trigger mode is set to Auto or Normal, the WT1800 waits for a trigger to occur. When a trigger occurs, the WT1800 begins capturing data.
  • Page 118 16 High Speed Data Capturing High Speed Data Capturing Operations Examples for when the trigger mode is Auto or Normal. Trigger Data wait capturing High speed data capturing Ready Start Ready state (HS State) File recording state Ready Ready (File State) Time Completion of Start key...

  • Page 119: Display Items (Item)

    16 High Speed Data Capturing Display Items (ITEM) Number of Columns (Column Num) You can select four or six columns. Column Number (Column No.) Select the number of the column that you want to configure. Element (Element/Σ) This is the same as the element (Element/Σ) item in the Matrix display. Click here.

  • Page 120: 17 Data Storage

    You can convert stored binary data to ASCII (.csv) format. You can analyze the converted data on a PC. You cannot use the WT1800 to recall stored data.

  • Page 121: Storage Control (Control Settings)

    (1 GB). Viewing and Optimizing the Maximum Storage Count (Optimize Count) • The WT1800 computes the maximum storage count for the storage destination according to the number of data types specified in the Item Settings.
  • Page 122 • You can set the day for the scheduled start or stop time in February to a value as high as the 31st day. If you do so, an error message will appear when you start storage. Reset the scheduled start and stop times. • The WT1800 recognizes leap years when it executes the storage operation. Trigger Event for Event-Synchronized Storage Mode (Trigger Event) This setting is only valid when the storage mode is set to Event.

  • Page 123: Stored Items (Item Settings)

    • In Non-Numeric Displays (Waveform display, trend display, etc.) The WT1800 stores data according to the numeric display settings. For example, when the waveform display is shown, if the 16-value display would appear when you pressed NUMERIC, then the data for the measurement functions on the page of the 16-value display that would appear is stored.

  • Page 124: Save Conditions (File Settings)

    • File name extensions are added automatically. • When the storage destination is a USB memory device, the maximum stored data file (.wts) file size is 1 GB. • You cannot load stored data using the WT1800. Click here. Displaying a File List and Specifying the Save Destination (File List) On the file list, specify the save destination.
  • Page 125 (.hds) with the same name. Do not change the names of stored numeric data (.wts) and header (.hds) files for different sets of data to the same name. If you do so, the WT1800 may malfunction and the USB memory may be damaged when you convert the data to ASCII format (.csv).
  • Page 126 (1 GB). Resetting Storage (STORE RESET) • When you reset storage, the WT1800 enters into the reset store state, in which the store state indicator is blank. • If you reset storage when the store state is “Stop,” writing to the stored data file (.wts) and header file (.hds) finishes, and the files are closed.

  • Page 127: Storage Operations In Each Storage Mode

    17 Data Storage Storage Operations in Each Storage Mode Manual (Manual storage mode) STORE STOP STORE START State Start Cmpl Time STORE START Storage count STORE RESET Real Time (Real-time storage mode) STORE START STORE STOP STORE START blinking State Cmpl Ready Start...
  • Page 128 17 Data Storage Single Shot (Single-shot storage mode) STORE STOP STORE START State Cmpl Start Time STORE RESET Storage count STORE START Storage Operations Performed When You Press STORE STOP After Storage Has Been Started Restarting Storage When you press STORE START, STORE STOP, and then STORE START STORE STOP STORE START STORE START...
  • Page 129 The held display values are stored. During integration, the values being measured are stored. • Media access indication icon only illuminates when the WT1800 creates files at the start of storage and closes them at the end of storage, but the WT1800 is actually always accessing the storage medium.

  • Page 130: 18 Saving And Loading Data

    A storage device on the network. You can use a network storage device by connecting the WT1800 to an Ethernet network. When you turn off the WT1800 power, the contents of the internal RAM disk are lost. Save the contents of the RAM disk to a USB memory device or network drive before you turn off the WT1800.

  • Page 131: Saving Setup Data (Save Setup)

    • Do not connect and disconnect multiple USB devices repetitively. Provide a 10-second interval between removal and connection. • Do not connect or remove USB devices from the time when the WT1800 is turned on until key operation becomes available (approximately 20 to 30 seconds).

  • Page 132: File Save Conditions

    • In Non-Numeric Displays (Waveform display, trend display, etc.) The WT1800 saved data according to the numeric display settings. For example, when the waveform display is shown, if the 16-value display would appear when you pressed NUMERIC, then the data for the measurement functions on the page of the 16-value display that would appear is saved.
  • Page 133 18 Saving and Loading Data Automatic File Naming (Auto Naming) Numbering (Numbering) The WT1800 automatically adds a four-digit number from 0000 to 0999 after the common name specified using the File Name setting and saves files. Date (Date) The date and time when the file is saved are used as its name. The file name specified for the File Name setting is ignored.

  • Page 134: Loading Setup Data (Load Setup)

    Loading (Load Exec) Loads the data of the specified file. • If you change the extension of the saved data file, by using a PC or some other device, the WT1800 will no longer be able to load it. • When setup information is loaded from a file, the setup data for each key is changed to match the loaded settings, and it cannot be changed back.

  • Page 135: File Operations (Utility)

    • When you turn off the WT1800 power, the contents of the internal RAM disk are lost. Save the contents of the RAM disk to a USB memory device or network drive before you turn off the WT1800.
  • Page 136 18 Saving and Loading Data File Selection (Set/Reset) Select or deselect files and folders. Selecting multiple files is useful when you want to copy or delete multiple files at the same time. Simultaneous File Selection (All Set/All Reset) • Selecting All Files (ALL Set) When the cursor is on a drive or folder in the file list, select ALL Set to select all of the files and folders within the drive or folder that the cursor is on.

  • Page 137: 19 Saving Screen Images

    “File Operations (Utility).” Click here. When you turn off the WT1800 power, the contents of the internal RAM disk are lost. Save the contents of the RAM disk to a USB memory device or network drive before you turn off the WT1800.

  • Page 138: Printing Screen Images And Numeric Data (Option)

    • In non-numeric displays (waveform display, trend display, etc.) The WT1800 prints data according to the numeric display settings. For example, when the waveform display is shown, if the 16-value display would appear when you pressed NUMERIC, then the data for the measurement functions on the page of the 16-value display that would appear is printed.

  • Page 139: Automatic Printing Execution (Auto Print On)

    20 Printing Screen Images and Numeric Data (Option) Automatic Printing Execution (Auto Print ON) Enable automatic printing. When you enable automatic printing, the timing at which printing occurs and at which the PRINT key illuminates varied depending on the print mode. For details, see “Print Timing for Different Print Modes.”...

  • Page 140: Comment (Comment)

    Reset the scheduled start and stop times. • The WT1800 recognizes leap years when it executes automatic printing. Trigger Event (Trigger Event) You can configure this setting when Print Mode is set to Event. You can select an event from Event1 to Event8.

  • Page 141: Print Timing For Different Print Modes

    20 Printing Screen Images and Numeric Data (Option) Print Timing for Different Print Modes The timings at which automatic printing can be executed are indicated below. Interval Print Mode When the scheduled start time is before Auto Print ON Auto Print Auto Print PRINT key PRINT key...
  • Page 142 20 Printing Screen Images and Numeric Data (Option) Integration Synchronization Print Mode Printing is executed in sync with the integration start time. When integration starts before Auto Print ON Integration Auto Print Forced Auto Print integration stop start PRINT key PRINT key PRINT key blinking...

  • Page 143: Printing (Print)

    20 Printing Screen Images and Numeric Data (Option) Event Synchronization Print Mode Printing is executed whenever a user-defined event occurs. When the time it takes to print is shorter than the data update interval Auto Print Auto Print PRINT key PRINT key Event occurrence...

  • Page 144: Ethernet Communication (Network)

    The WT1800 clock can be set using SNTP. When the WT1800 is turned on, the date and time are set automatically. Click here. To connect a PC to the WT1800, use a hub or router, and connect to a network. Do not connect a PC directly to the WT1800. 21-1...

  • Page 145: Tcp/Ip (Tcp/Ip)

    You can use up to 127 characters. The characters that you can use are 0 to 9, A to Z, a to z, and hyphens. TCP/IP settings are applied when you press Bind and then SET or when you turn on the WT1800 the next time.

  • Page 146: Ftp Server (Ftp Server)

    User Name (User Name) Set the user name that will be used to access the WT1800 from a PC. If you set the user name to “anonymous,” you can connect to the WT1800 without entering a password.

  • Page 147: Network Drive (Net Drive)

    21 Ethernet Communication (Network) Network Drive (Net Drive) You can save the WT1800’s setup data, numeric data, waveform display data, and screen image data to a network drive. You can also load the setup data from a network drive into the WT1800.

  • Page 148: Sntp (Sntp)

    SNTP Server (SNTP Server) Specify the IP address of the SNTP server that the WT1800 will use. In a network with a DNS server, you can specify the host name and domain name instead of the IP address.

  • Page 149: Utility

    You can reset the WT1800 settings to their factory default values. Click here. Remote Control (Remote Control) You can select the method for connecting a PC to the WT1800 to control it. Click here. System Configuration (System Config) You can set the date and time, time synchronization, the menu and message languages, the LCD intensity, whether the backlight is on or off, the USB keyboard language, and USB communication, and you can format storage media.

  • Page 150: Overview (System Overview)

    Only initialize the WT1800 if you are sure that it is okay for all of the settings to return to their initial values.

  • Page 151: Remote Control (Remote Control)

    WT1800 will not execute the commands properly. • When the WT1800 is in remote mode and is communicating with a PC, “REMOTE” appears in the center of the WT1800 screen. All keys except LOCAL are disabled in Remote mode.
  • Page 152 Click here. Notes about Connections • To connect the WT1800 to a PC, be sure to use straight cables through a hub. Correct operation is not guaranteed for a one-to-one connection using a crossover cable. • Use one of the following types of network cables that support the data rate of your network.

  • Page 153: System Configuration (System Config)

    This setting appears when the method for setting the date and time is set to SNTP. Set the time difference between the region where you are using the WT1800 and Greenwich Mean Time to a value within the following range.
  • Page 154 22 Utility Language (Language) Set the language that is used in the setup menus and messages. Menu Language (Menu Language) You can choose to display menus using one of the following languages. • English • Japanese • Chinese • German Message Language (Message Language) Error messages appear when errors occur.
  • Page 155 • English: 104 keyboard • Japanese: 109 Keyboard For details on how the WT1800 keys are mapped to the keys on a USB keyboard, see appendix 7 in the getting started guide, IM WT1801-03EN. Environment Settings (Preference) Display Digits (Resolution) You can choose to display four digits or five digits of the numeric data.

  • Page 156: D/A Output (D/A Output Items; Option)

    D/A zoom feature. If you set the D/A output range mode to Manual and set the minimum value to 0.6 and the maximum value to 0.8, the WT1800 will produce –5 V when the measured current value is 0.6 A and +5 V when the measured current value is 0.8 A.
  • Page 157 (measurement range × scaling factor). • For Σ functions, the WT1800 produces 100% output (5 V) when the measured value is equivalent to the value that is measured when all of the elements in the group are at their rated values. When the elements have different scaling factors, the WT1800 produces 100% output (5 V) when the scaled measured values are the same as the scaled rated values (measurement range ×...
  • Page 158 22 Utility Integrated Values D/A output Approx. 7.0 V At 140% of the rated input 5.0 V At the rated input Integration time t0: The rated time of integrated D/A output in manual integration mode. The timer time in normal or continuous integration mode. Other Items Displayed Output...

  • Page 159: Self-Test (Selftest)

    If the characters that you type appear correctly in the keyboard’s input box, the keyboard is functioning properly. Executing a Test (Test Exec) The selected self-test starts. If an Error Occurs during a Self-Test If an error occurs even after you perform self-tests numerous times, contact your nearest YOKOGAWA dealer. 22-11 IM WT1801-01EN...

  • Page 160: 23 Other Features

    Zero-Level Compensation (CAL) Zero-level compensation is the process of creating a zero-input condition using the WT1800 internal circuit and setting the level at that point to the zero level. It must be performed to meet the specifications of this instrument.
  • Page 161 NULL value. If you press NULL again afterwards, the NULL feature is disabled. The WT1800 saves the NULL value. Even if you press NULL and enable the NULL feature, the NULL value is not updated.

  • Page 162: Enabling And Disabling The Null Feature (Null)

    This key is invalid when the WT1800 is in local lockout mode. Key Lock (KEY LOCK) When you enable the key lock, the WT1800 behaves as described below. You can use the key lock to prevent unintentional operations.

  • Page 163: Index

    Index Symbols C1+ Trace ................15-1 Page C2x Position ............... 15-2 Δ Measure ................2-6 C2x Trace ................15-1 ΔMeasure Mode ..............2-8 CAL ..................23-1 ΔMeasure Type ..............2-6 calculation..............4-4, 5-2 η Formula ................2-4 capture control settings ............16-5 Σ...
  • Page 164 Index display format, bar graph ............ 12-1 FTP server ................21-3 display format, numeric data ......... 7-1, 7-4 FU/FI/η .................. 7-5 display format, trend ............11-2 display format, vector ............13-2 Page display format, waveform............ 10-2 GP-IB .................. 22-3 display frame ................ 7-6 graticule ................
  • Page 165 Index linear scale ..............4-3, 5-2 Page linear scale, motor evaluation ..........4-3 p-p compression ..............10-3 linear scaling, auxiliary input..........5-2 PAGE DOWN ............... 7-3 line filter ..............2-19, 4-4, 5-3 PAGE END ................7-3 line filter, auxiliary input ............5-3 PAGE TOP ................
  • Page 166 Index saved items ................ 16-8 sync speed ................4-7 save numeric ..............18-2 system config..............22-5 save setup ................18-2 system overview ..............22-2 save wave................18-2 system settings ..............22-5 saving numeric data ............18-2 scale mode ................. 12-2 Page scale value................
  • Page 167 Index vector zoom ................ 13-2 vertical axis ................. 10-4 vertical position ..............10-9 vertical scale ............... 12-2 vertical scale type ............... 12-2 vertical zoom ..............10-8 volt-ampere hours..............9-1 voltage and current measurement modes ......16-5 voltage auto range .............. 2-10 voltage range ................

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