Cost-effective Digital Sampling Power Analyzer. Digital Power Meter

Transcription

1 Costeffective Digital Sampling Power Analyzer Digital Power Meter WT2/WT3 Fundamental accuracy of.2% (WT2) or.25% (WT3) DC measurement, Hz to 5 khz frequency band Compact design (halfrack size) MAX hold function (WT2) Builtin 5 ma range for measuring small current (WT2) Builtin harmonic analysis function (optional) Comparator function (optional) for GO/NOGO judgement User calibration (by remote communication or manually) Sensor input(optional) for use with external current clamps and shunts Bulletin 25346E

2 Measure anything from low standby power to rated power with a single WT2. Builtin wide input range of 5 ma to 2 A with WT2 Features of WT2 Builtin small input range from 5 ma The WT2 s 5 ma range enables currents as low as 25µA to be measured, making it ideal for measuring small currents of intermittently controlled equipment. Furthermore, the wide current range extends from 5 ma to 2 A, so a single WT2 can measure everything from the standby power to the rated power of a device. MAX hold function The maximum display values for voltage and current peak values, voltage and current rms values, active power, apparent power, or reactive power are held on the LED display. This is handy for evaluating inrush currents or measuring the maximum consumed power resulting from load fluctuations. Integrating time of one second to, hours The integrating time can be set from one second to, hours in units of one second, thus allowing flexible analysis of a short time or within a specific period. Display of average active power Intermittently controlled equipment intended for reducing power consumption has periods of activity and inactivity (standby), so the power value changes significantly each time the display is updated. The WT2 can display the average active power determined from the integrated power, so the integrated power of intermittently controlled equipment can be measured. Average active power (W) Integrated power (Wh)/Integrated elapsed time (hour) Power Instantaneous power Average active power Time Example of current measurement error tolerance of WT2 (5 ma/ 5 ma ranges) 2 Tolerance relative to reading (% of reading) ma range 5 ma range. Input level relative to set range (% of range)

3 Basic Power Measurement Functions & Optional Functions for Broader Applications Outstanding Functionality and Portability Features of WT2/WT3 DC Measurements The WT2 and WT3 can measure DC, and so halfwave rectified signals containing DC components or intermittent signals can be measured without considering the input signals. Compact Design, Large LED Display The ultracompact case design allows two models to be rackmounted side by side. And the low weight of just 3 kg for the WT2 or 5 kg for the WT3 makes light work when using the devices in the field. The new large LED display also greatly improves readability. Four Arithmetic Operations and Crest Factor Function Voltage and Current Crest Factor, and the results of four arithmetic operations from the measured values of Displays A & B can be displayed on Display C. The WT3 can also calculate Efficiency. Storage/Recalling of Measured Data and Setting Information Measured data can now be stored while onsite thanks to an internal memory. Data of about 6 measurements can be stored in the WT2 singleinputelement model, or data of about 2 measurements in the WT3 threeinputelement model. Stored data can also be read from the memory and displayed on the LED display. And up to four setting patterns can be stored. Bidirectional Integration function The WT2 and WT3 are perfect for evaluating batteryoperated equipment and motordriven machines that regenerate power. This function integrates current or power in both the positive and negative directions independently. Harmonic Analysis Function (Optional) Despite their low cost, the WT2/WT3 can be equipped with a harmonic analysis function for calculating and displaying voltage, current, active power, harmonic contents ratio, and phase angle relative to the fundamental signal up to the 5th order, making these power meters ideal for power supplies. Current Sensor Input (Optional) The WT2/WT3 can be equipped with either a shunt input range (5//2 mv) or sensor input voltage range (2.5/5/ V). The use of a current clamp allows current measurements without disconnecting the wiring of the power circuit. Fourchannel Comparator & D/A Output (Optional) 4channel D/A outputs can be included in addition to the 4 sets of relay contact outputs (normally opened and normally closed contacts in pairs) used to judge GO/NOGO in production or inspection lines. Comparison between WT2 and WT3 Number of inputs Fundamental voltage/current accuracy Fundamental power accuracy Voltage range Current range WT2 Single input element ±(.5% of rdg +.% of rng) ±(.2% of rdg +.% of rng) 5/3/6/5/3/6 [V] 5//2/5//2[mA].5//2/5//2 [A] Available DC, Hz to 5 khz Standard Standard Standard sec. to, hr (units of sec.) Available (optional) WT3 Two or three input elements ±(.2% of rdg +.% of rng) ±(.25% of rdg +.% of rng) 5/3/6/5/3/6 [V].5//2/5//2 [A] DC measurement Frequency range Peak measuring function MAX hold function Display of average active power Setting of integrating time Harmonic analysis function Available DC, Hz to 5 khz Standard Not available Not available min. to 999 hr 59 min. (units of min.) Available (optional) 3

4 Applications and Characteristics Measurement of Small Current and Power of Home Appliances (WT2) The power consumption of home appliances such as videocassette recorders and TV sets is progressively being reduced, not only during operation but also on standby. th its low current range *, the WT2 can precisely measure small (standby) current and power. Also, the D/A output function *2 allows measured data of voltage, current, power, etc. to be recorded in a recorder or other units. *Current range of 2 ma or below (5//2/5//2 ma) is available only in the WT2. *2When the D/A output function is added, the WT2 has 4 D/A output channels; the WT3 has 2 D/A output channels. Voltage and current D/A output of ±5 V DC AC power supply, 5/6 Hz Recorder Voltage Current Measurements of Harmonic Current Using a Clamp Sensor The WT2/WT3 can be equipped with an external sensor input for measuring current with a clamp sensor. This allows current to be measured in the field without releasing connections. The harmonic analysis function allows current components of up to the 5th order to be analyzed. Data of voltage, current, and harmonic components can be output to an external printer thanks to the communication function. The comparator function (maximum of 4 channels) enables GO/NOGO judgement of products to be made. Example of Surge thstand Characteristics for Current Input of WT2 Current (Arms) Time width (s).5a2a 5mA2mA Example of Surge thstand Characteristics for Current Input of WT3 Current (Arms) Time width (s) Influence of Commonmode Voltage on the Reading Current GPIB or RS232C AC clamp NC COM Effect (%) NO Reference value Actual value WT2/WT3 Frequency of commonmode voltage (Hz) Example of Application of D/A Output Accuracy Characteristics of Frequency Power DC step input Reference value Actual value Error (%) Response of D/A output 4 Observation time of 2 seconds Input frequency (Hz)

5 Specifications Input Input circuit type Item Rated inputs (range) Equipment loss (input resistance) Instantaneous maximum allowable input for one cycle, 2 ms Instantaneous maximum allowable input for sec. Continuous maximum allowable input Continuous maximum commonmode voltage (at 5/6 Hz input) Commonmode rejection ratio at 6 Vrms between input terminal and case Input terminals A/D conversion Range switching Automatic range switching Measurement mode switching Voltage V Resistance voltage divider 5/3/6/5/3/6V Input resistance: Approx. 2 MΩ, Input capacitance: Approx. 3 pf Peak voltage of 2.8 kv or rms of 2. kv, whichever is less Peak voltage of 2. kv or rms of.5 kv, whichever is less Peak voltage of.5 kv or rms of. kv, whichever is less Floating input Current A Shunt input Direct input: 5//2/5//2 ma (for WT2 only).5//2/5//2 A (for WT2/WT3) External input (optional): 2.5/5/ V or 5//2 mv Direct input: Approx. 6 mω + approx.. µh (.5 to 2 A, WT2/WT3),Approx. 5 mω (5 ma to 2 ma, WT2) External input: 2.5/5/ V approx. kω or 5//2 mv approx. 2 kω.5 to 2 A (WT2/WT3): Peak current of 45 A or rms of 3 A, whichever is less 5 to 2 ma (WT2): Peak current of 5 A or rms of A, whichever is less For external input, the peak value is equal to or less than times range..5 to 2 A (WT2/WT3): Peak current of 5 A or rms of 4 A, whichever is less 5 to 2 ma (WT2): Peak current of 3 A or rms of 2 A, whichever is less For external input, the peak value is equal to or less than times range..5 to 2 A (WT2/WT3): Peak current of A or rms of 25 A, whichever is less (WT2) Peak current of A or rms of 3 A, whichever is less (WT3) 5 to 2 ma (WT2): Peak current of 3 A or rms of 2 A, whichever is less For external input, the peak value is equal to or less than 5 times range. 6 Vrms (with the output connector protective cover used) CAT II, 4 Vrms (with the output connector protective cover removed) CAT II th voltage input terminals short and current input terminals open, 5/6 Hz, 8 db or more (±.% of range or less) Reference value: 5 khz max., ±{(maximum range rating)/(range rating). % of rng} or less (voltage range,.5 A to 2 A current range) ±{(maximum range rating)/(range rating).2 % of rng} or less (WT2, 5 ma to 2 ma range).% or more. The unit of "f" is khz. Binding posts Direct input: Large binding posts, External input: Safety terminals Simultaneous conversion of voltage and current inputs, Resolution: 2 bits, Maximum conversion rate: Approx. 26 µs (at approx. 38 khz) Range can be selected manually, automatically, or by communication control. Range up: When the measured value exceeds % of the rated range or the peak value exceeds approximately 3% of the rated range Range down: When the measured value becomes less than 3% of the rated range and the peak value is less than approximately 3% of the subordinate range One of the following modes can be set (manually or by communication control): RMS: True RMS measurements for both voltage and current; V MEAN: Rectified mean calibrated to an RMS sine wave measurement for voltage, and true RMS measurement for current; DC: Mean value measurement for both voltage and current Notes: Direct input and external sensor input of current cannot be used simultaneously. When the input is switched for use, note that the ± terminals are shared. Measurement Functions Item Method Frequency range Crest factor Display accuracy Accuracy (within 3 months after calibration) Conditions: Temperature: 23 ± 5 C Humidity: 3 to 75% R.H. Supply voltage: V ± 5% Input waveform: Sine wave Commonmode voltage: V DC Filter: ON at 2 Hz or less Scaling: OFF After CAL is performed, accuracy is assured by YOKOGAWA calibration system. Note: The unit of "f" in accuracy expressions is khz. Effect of power factor Note: The unit of "f" in accuracy expressions is khz. Effective input range Accuracy (within 2 months after calibration) Temperature coefficient Display update rate DC: Hz f 45Hz : 45Hz f 66Hz : 66Hz f khz : khz f khz : khz f 2kHz Voltage/current Reference value 2kHz f 5kHz : ± (.5 % of rdg +.5 % of rng) ± [{.5 (f)}% of rdg] *DC: ±.2% of range is added if the.5/ A range is selected (WT3 only) Active power Digital sampling method and summation averaging method DC, Hz to 5 khz "3" at rated input ± (.2 % of rdg +.2 % of rng)* ± (.3 % of rdg +.2 % of rng) ± (.5 % of rdg +. % of rng) ± (.3 % of rdg +.2 % of rng) ± (.2 % of rdg +.3 % of rng) ± {(.5 )% of rdg} ± (.5 % of rdg +.5 % of rng) ± [{.5 (f)}% of rdg] DC: Hz f 45Hz : 45Hz f 66Hz : 66Hz f khz : khz f khz : khz f 2kHz : ± (.3 % of rdg +.3 % of rng)* ± (.5 % of rdg +.3 % of rng) ± (.2 % of rdg +. % of rng)(wt2) ± (.25 % of rdg +. % of rng)(wt3) ± (.5 % of rdg +.3 % of rng) ± (.3 % of rdg +.5 % of rng) ± {(.8 f)% of rdg} ± (.8 % of rdg +.8 % of rng) ± [{.9 (f)}% of rdg] Reference value 2kHz f 5kHz : ± (.8 % of rdg +.8 % of rng) ± [{.25 (f)}% of rdg] *DC: ±.2% of range is added if the.5/ A range is selected (WT3 only) cosϕ 45 Hz f 66 Hz: Add ±.25% of range to display accuracy. Reference data (5 khz max.): ±{( x f)% of rng} > cosϕ > Add the value of the influence of cosϕ times tanϕ to display accuracy. Note that ϕ represents the phase angle between voltage and current. For the input range of % to %, the above specified accuracy is valid. For the input range of % to 3%, the above specified reading accuracy increased by.5 times is added to the accuracy. The above specified reading accuracy increased by.5 times is added to the accuracy (within 3 months after calibration). ±.3% of range/ C at 5 to 8 C and 28 to 4 C 4 times/s Note: "rdg" means reading and "rng" means range. Frequency Measurement Input: One of V, V2, V3, A, A2, and A3 is selected. Operating principle: Reciprocal counting method Frequency range: Hz to 5 khz Accuracy: ±(.% of rdg + digit) Minimum input is more than 3% of rated range. When an input frequency is less than 2 Hz, FILTER must be ON to obtain the specified accuracy. Minimum input frequency is more than 2% of frequency measurement range. Communication Either GPIB or RS232C is selected. GPIB Electrical and mechanical specifications: IEEE Std (JIS C 9987) Functional specifications: SH, AH, T5, L4, SR, RL, PR, DC, DT, C Protocol: IEEE Std Code used: ISO (ASCII) code Address: to 3 talker/listener addresses are settable. RS232C Transmission mode: Startstop synchronization Baud rate: 75, 5, 3, 6, 2, 24, 48, 96 bps 5

6 6 Computation phase 2wire phase 3wire 3phase 3wire (twopowermeter method) 3phase 3wire (threepowermeter method) 3phase 4wire Computing range Display resolution Computing accuracy (relative to the value calculated from measured values) Active power (W) W+W3 i, 2, 3 W+W2 +W3 Apparent power (VA) Vi Ai VA+VA 3 Vi Ai W+W3 3 2 (VA+VA 3) Vi Ai i, 2, 3 i, 2, 3 (Note that W2 does not have physical meaning.) W W+W3 VAV A 3 3 (VA+VA2 +VA 3) Vi Ai i, 2, 3 VA+VA2 +VA 3 Depends on Depends on selected V selected V and and A ranges. A ranges. ±.5% of VA range vari Reactive (var) (VA) 2 W 2 vari () 2 2 Σ var var+var3 Power factor (PF) Σ PF Note :The apparent power (VA), reactive power (var), power factor (PF), and phase angle (deg) measurements in this instrument are computed digitally from the voltage, current, and active power. If the input is nonsinusoidal, the measured values may differ from those obtained with instruments employing different measurement principles. Note 2:When the current or voltage is less than.5% of the range, VA and var will be displayed as, and PF/deg will be displayed as an error. Note 3:The Lead and Lag are displayed for V and A input at 5% or more of the rated range. The detected lead/lag accuracy is ±5 degrees over the frequency range of 2 Hz to 2 khz. Note 4:In a Σvar calculation, the var value of each phase is calculated as a negatively signed value when the phase of the current input is advanced with respect to the voltage input, and is calculated as a positively signed value when the phase is lagging. * The WT2 can provide 5digit display (note that the resolution is 2). PFi PFi () 2 2 Σ var Σ PF var+var3 vari () 2 2 i, 2, 3 Σ var var+var3 vari () 2 2 i, 2, 3 Σ var var+var2+var3 Same as apparent power (var ) PFi W VA i, 2, 3 Σ PF PFi i, 2, 3 Σ PF to to 9999* 9999* 9999* ±.* ±.5% of var range.5 Display Function Display type: 7segment LED Number of displays: 3 Display A B C Displayed value V, A, W, VA, var (each element), elapsed integrating time V, A, W, PF, deg (each element), % (contents ratio in %, THD) V, A, W, V AHz, ±Wh, ±Ah (each element), Vpk, Apk, MATH * In the WT2 either 4 or 5 digits for display can be selected. ϕ i cos ( ) Σϕ cos ( ) ΣVA ϕ i Phase angle (deg) W cos ( ) VA cos ( ) Σϕ cos ( ) ΣVA ϕ i cos ( ) i, 2, 3 Σϕ cos ( ) ΣVA ϕ i cos ( ) i, 2, 3 Σϕ cos ( ) ΣVA 8 to to 8 ± 8. Resolution (power factor ±.5) Maximum Reading V, A, W: 9999 Wh, Ah: V, AHz : 9999 Unit: m, k, M, V, A, W, VA, var, Hz, h±, deg, % Display update rate: 4 times/s Response time: Approx..5 s (time for displayed value to settle within specified accuracy of final value after step change from % to % or % to % of rated range) Display scaling function Significant digits: Selected automatically according to significant digits in the voltage and current ranges Setting range:. to 9999 (WT2),. to (WT3) Averaging function: Either of the following two algorithms can be selected: Exponential averaging Moving averaging Response can be set; for exponential averaging, the attenuation constant can be selected and for moving averaging, the number of averages (N) can be set to 8, 6, 32, or 64. Peak overrange display The alarm LED will light up if the rms value is greater than 4% of the range or the peak value is greater than 3% of the range. MAX hold function (WT2 only) Capable of storing the maximum values for V, A, W, VA, var, Vpk, and Apk. MATH function Method: Integrator Function When the DISPLAY C function is set to MATH, the efficiency (WT3 only) and input crest factor can be measured, and the results of four arithmetic operations of measured values can be displayed on Displays A and B as well as the average active power after timeconversion of integrating power (WT2 only). Display resolution: Depending on integrated value, the resolution will be changed (for WT2). Depending on elapsed time value, the resolution will be changed (for WT3). Maximum display: to MWh/MAh Modes: Standard integration mode (timer mode) Continuous integration mode (repeat mode) Manual integration mode Timer: When the timer is set, integration will be stopped automatically. Setting range: h: min: sec to h: min: sec (WT2) Setting range: h: min to 999 h:59 min (WT3) (When set time is, the manual integration mode is automatically selected.) Type: Standard type Adds active power and current value of normal measurements. Advanced type (WT2 only) Integrates active power and current values in short time intervals, not depending on input signal period. Count overflow: If the integration count exceeds MWh/MAh or MWh/MAh, integration stops and the elapsed time is held on the display. Accuracy: ± (display accuracy +.2% of rdg) Timer accuracy: ±.2% Remote control: Start, stop, and reset can be remotely controlled by an external contact signal. Note that this is available only when the /DA4 or / DA2 option has been installed. Internal Memory Function Measurement data Number of data that can be stored: WT2 (25342): 6 blocks WT3 (25352): 3 blocks WT3 (25353): 2 blocks Writing interval: 25 ms, or s to 99 h:59 min:59 sec Reading interval: 25 ms, or s to h (both intervals can be set in units of second) Panel setup information: Fourpattern information can be written/read. D/A Converter (Optional) Output voltage: ±5 V DC FS (approx. ±7.5 V maximum) at rated value or range Number of output channels: 2 when the /DA2 option is installed; 4 when the /DA4 option is installed Output data selection: Can be selected for each channel. Accuracy: ± (display accuracy +.2% of range) Update rate: Same as display update rate Temperature coefficient: ±.5% of f.s./ C Output format Frequency Integration Other items D/A output 7.V 5.V D/A output 7.5V 5.V 2.5V.5V Displayed value 4% % % % 4% Hz Hz khz khz 5kHz Displayed value 4% input of the rated value t: Rated value setting time Output 7.V 5.V V 5.V 7.V For PF and deg, a value between ±5 and ±7 V will not be output. If an error occurs, the output will be approx. 7.5 V. 4% % Rated value input D/A output 7.5V 7.V 5.V V 5.V 7.V 7.5V t % 4% Integration time Displayed value

7 External Input (Optional) Either /EX or /EX2 can be selected as a voltageoutputtype current sensor. /EX: 2.5/5/ V /EX2: 5//2 mv Specifications: See the Input item. Comparator Output (Optional) Output method: Normally open and normally closed relay contact outputs (in pairs) Number of output channels and channel setup: 4 (settable for each channel) Contact capacity: 24 V/.5 A D/A output (4 channels): See the D/A Converter (Optional) item. External Control and Input Signals (only when the D/A or /CMP option has been installed) External control and input/output signals: EXTHOLD, EXTTRIG, EXTSTART, EXTSTOP, EXTRESET, INTEGBUSY Note: That the /DA4 or /DA2 option must be installed. Note: Only EXTHOLD and EXTTRIG are available when the / CMP option has been installed. Input level: TTL negative pulse General Specifications EMI standard: EN55 Group Class A EN5822: 995 Safety standards: EN6 Overvoltage Category II Pollution degree 2 Warmup time: Approx. 3 min. Operating temperature and humidity range: 5 to 4 C, 2 to 8% R.H. (no condensation) Storage temperature: 25 to 6 C (no condensation) Operating altitude: 2 m or less Insulation resistance: Between voltage input terminals and case Between current input terminals and output terminals Between voltage input terminals and current input terminals Between voltage input terminals of each element Between current input terminals of each element Between voltage input terminals and power plug Between current input terminals and power plug Between case and power plug The above values must be 5 MΩ or more at 5 V DC. thstanding voltage: Between voltage input terminals and case Between current input terminals and output terminals Between voltage input terminals and current input terminals Between voltage input terminals of each element Between current input terminals of each element Between voltage input terminals and power plug Between current input terminals and power plug The above values must be 37 V for minute at 5/6 Hz. Between case and power plug: 5 V for minute at 5/6 Hz Power supply: Any power supply voltage between and 24 V; frequency: 5/ 6 Hz Vibration test conditions: Sweep test Frequency: 8 to 5 Hz sweep, all three directions for minute Endurance test Frequency: 6.7 Hz, all three directions; amplitude of 4 mm for 2 hr Impact conditions: Impact test: Acceleration of 49 m/s 2, all three directions Freefall test Height: mm, time for each of four sides Power consumption: WT2: 35 VA max., WT3: 5 VA max. (for power supply of 24 V) WT2:25 VA max., WT3: 32 VA max. (for power supply of V) External dimensions: WT2:Approx. W H D: (mm) (not including projections) 83/8 3/2 33/4 (inch) (not including projections) WT3:Approx. W H D: (mm) (not including projections) 83/8 53/6 33/4 (inch) (not including projections) Weight: WT2:Approx. 3. (kg), 6.6 (lbs.) WT3:Approx. 5. (kg),. (lbs.) Accessories: Power cord: UL/CSA, VDE, SAA or BS standard, pc. External Dimension Unit: mm Harmonic Analysis Function (Optional) Method: Synchronization to the fundamental frequency by using a phase locked loop (PLL) circuit Frequency range: Fundamental frequency between 4 Hz and 44 Hz Display resolution: 9999 (WT3), 9999 or 2 (WT2) Items analyzed: V, A, W, deg (WT2); V, V2, V3, A, A2, A3, W, W2, W3, deg, deg2, deg3 (WT3), each harmonic component, total Vrms, total Arms, total active power, PF of the fundamental wave, phaseangle of fundamental wave, total harmonic distortion ratio in %, and contents ratio in % Note that simultaneous analysis can be made for one specified input mode. Sampling speed/method: The sampling speed depends on the fundamental frequency to be input: Input Sampling ndow frequency frequency up to the n'th Order range harmonic 4f<7Hz f 52Hz 7f<3Hz f 256Hz 3f<25Hz f 28Hz 25f44Hz f 64Hz FFT number of points: 52 points FFT FFT calculation accuracy:32 bits ndow: Rectangular window Display update interval: Approx. 3 sec. Accuracy: Model and Suffix Codes Model Suffix Code Power cord D F R Q Optional features /C /C2 /EX /EX2 /HRM /DA4 /CMP period of f 2 period of f 4 period of f 8 period of f ±.2% of range is added to the normal display accuracy. Description WT2, input element model UL/CSA standard VDE standard SAA standard BS standard GPIB communication function RS232C communication function External input 2.5/5/ V External input 5//2 mv Harmonic analysis function 4channel D/A output Comparator & D/A, each of 4 channels Note: The WT2 communication feature cannot be modified or provided later after delivery of the product. Model Interface C C2 Supply voltage Power cord Optional features Suffix Code D F R J /EX /EX2 /HRM /DA2 /CMP ring and Model ring Singlephase, 2wire Singlephase, 3wire Threephase, 3wire (2powermeter method) Threephase, 3wire (3powermeter method) Threephase, 4wire Accessories Description WT3, 2input element model WT3, 3input element model GPIB communication function RS232C communication function Any power supply voltage between and 24 V UL/CSA standard VDE standard SAA standard BS standard External input 2.5/5/ V External input 5//2 mv Harmonic analysis function 2channel D/A output Comparator & D/A, each of 4 channels Model Name Model or Part Number Specifications Order Quantity 75533E2 Singlemounted WT2 for EIA J2 Singlemounted WT2 for JIS E J2 Dualmounted WT2 for EIA Dualmounted WT2 for JIS 75533E3 Singlemounted WT3 for EIA J3 Singlemounted WT3 for JIS 75534E3 Dualmounted WT3 for EIA J3 Dualmounted WT3 for JIS 7

8 Related Products WT2/WT23 Digital Power Meter Enhanced power meter, incorporating a total harmonic analysis function conforming to the IEC standard. WT/WT3/WT3M Digital Power Meter Generalpurpose midclass models suitable for a wide range of applications Outstanding performance:.3%/dc, 2 Hz to 5 khz High accuracy:.8% (45 to 66 Hz) Total harmonic current/flicker conforming to IEC32 and 3 can be measured. Frequency response: DC,.5 Hz to 3 khz High accuracy:.2% (45 to 66 Hz) Overall efficiency of a motor can be measured by using the motor evaluation function (only WT3M). PZ4 Power Analyzer New concept power meter capturing power fluctuations as waveforms DL78E/DL76 Digital Scope For simultaneous measurement of voltage, temperature, distortion, and logic Frequency response: DC to 2 MHz Sampling speed: 5 MS/s maximum Fundamental power accuracy: ±(.% of rdg +.25% of rng) Voltage and current waveform display and analysis function Motor evaluation function (when equipped with module) Inputs of up to 8 analog channels (DL78E)/6 analog channels + 32 logic bits (DL76) Eight types of mixed plugin input units Record length of 64M words maximum (DL76 s 6M words/ ch. model) Builtin HDD (optional) YOKOGAWA ELECTRIC CORPORATION Measurement Sales Dept. 932, Nakacho 2chome, Musashinoshi, Tokyo 8875, JAPAN Phone: , Fax: YOKOGAWA CORPORATION OF AMERICA 2 Dart Road, Newnan, Georgia 3265, U.S.A. Phone: , Fax: YOKOGAWA EUROPE B.V. Vanadiumweg, 382 PX Amersfoort, THE NETHERLANDS Phone: , Fax: YOKOGAWA ENGINEERING ASIA PTE. LTD. 5 Bedok South Road, Singapore Phone: , Fax: YOKOGAWA ELECTRIC CORPORATION Test & Measurement Business Division 55 Takamurocho, Kofushi, Yamanashiken, Japan Phone: , Fax: Represented by : MM7E Subject to change without notice. [Ed : 5/b] Printed in Japan, 9(YG) All Rights Reserved, Copyright 995, Yokogawa Electric Corporation.