Notice: This product was discontinued on 12/31/2012.
PX8000 Precision Power Scope is a replacement product.

This powerful Power Analyzer was designed to help R&D to create a new generation of environmentally friendly products and technologies. It has been developed and produced in our ISO14001 approved facilities, in accordance with YOKOGAWA's "Guidelines for Designing Products for the Environment", and our "Criteria for Environmental Assessment in Product Design". We have adopted these Guidelines and Standards to help protect the Global Environment, consistent with the focus of the Third Conference of the Parties to the United Nations Framework Convention on Climate Change (COP3, Kyoto, December 1997).

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The PZ4000 was selected by
TM Magazine for the
Best in Test 1999.


Test & Measurement's award recognized the PZ4000 as a powerful analyzer due to these features:

  • Wide measurement bandwidth (DC, up to 2 MHz).
  • Accurate capturing of input waveforms using high-speed (maximum 5 MS/s) sampling.
  • Voltage and current waveform display and analysis functions to enable power calculations on fluctuating inputs.
  • Harmonic analysis (up to 500th order) and Fast Fourier Transform (FFT) functions to enable high-frequency power  spectrum analysis.
  • Multiple channel, synchronized measurements using multiple units and Master-Slave trigger function simplifies complex investigations.
  • Environmentally friendly design based on YOKOGAWA's Guidelines for Designing Products for the Environment and Criteria for Environmental Assessment in Product Design.
  • Sensor input module option enables evaluation of motor efficiency and total efficiency including the motor drive.

Display of Measured Waveforms

Measured voltages and currents are sampled at high speed (maximum 5 MS/s). Power is calculated from the sampled data along with accurately displayed waveforms

Display Examples:
Output signal check for an inverter-driven 3-phase motor
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Check using zoom function to determine whether pulse waveforms are fully acquired during low-rpm operation
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  • Correlate between displayed waveforms and calculated power values.
  • Waveform displays and calculated values (e.g., power values) are based on sampled data stored in internal memory, so they are correlated with each other.
  • Check measurement effectiveness easily.
  • Measured waveforms and calculated values can be checked at the same time to prevent erroneous measurements.
  • No probe needed for waveform measurements.
  • Voltage and current waveforms can be measured without using oscilloscope differential probes and current probes. The PZ4000 can make waveform measurements much more accurately than with conventional oscilloscopes.

Wide Bandwidth, HIgh-Precision Measurements

Measurements can be made over a wide frequency range (DC up to 2 MHz), making it possible to measure power loss on electronic components, high-frequency lighting equipment, and other devices. 

Display Examples:
Measurements on inverter lighting equipment with a fundamental wave of approximately 50 kHz
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Loss measurement during high-frequency capacitor driving (500 kHz)
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  • High-precision power measurements at high frequency
  • Waveform displays and calculated values (e.g., power values) are based on sampled data stored in internal memory, so they are correlated with each other.
  • Lamp current measurement in fluorescent bulbs
  • With the PZ4000, you can measure the lamp current of fluorescent bulbs using a Delta Computation function. The function computes the difference of the instantaneous values between the output current of electric ballast and a cathode current.
  • Loss measurement when actual load is applied to electronic components
  • With the PZ4000, you can measure power loss resulting from actual load applications, instead of evaluating characteristics based on small signals using an LCR meter or an impedance analyzer.
  • Power measurements on extremely low-frequency signals
  • Take full advantage of the 4 M word internal memory (optional; enough for 4 million samples) to obtain precise measurements of extremely low-frequency (several mHz) signals.

Dynamic Capturing of Load Fluctuations

Internal memory (maximum 4 M words) stores your measurements. You can calculate and display voltage, current, and power values for specific portions of the total memory (equivalent to 100 k words of data). The display makes it easy to see how the load fluctuates with time.

Display Examples:

Inrush current measurement in an inverter-type cleaner
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Efficiency evaluation when inverter output is turned on in a cooking machine using induction heating
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  • Inrush current and power measurements (at switch-on)
  • In the past, it was necessary to measure inrush current and power values at power-on using measuring instruments such as oscilloscopes. The PZ4000 performs these measurements much more accurately and greatly simplifies this procedure.
  • Power measurements in specific states (specific spans in internal memory)
  • Power measurements on equipment with fluctuating loads are normally obtained by measuring the energy in certain operating patterns over a long time period using an integration function. The average power value is then calculated. In contrast, The PZ4000 lets you make power measurements over a specific period defined by adjustable cursors. This reduces the time required for measurements.

Graphical Power Analysis

The PZ4000 lets you analyze harmonics (up to 500th order) using high-speed sampling. With the FFT calculation function, you can perform spectrum analysis in the high-frequency range (up to 2.5 MHz). Analysis results are displayed on spectrum graphs. In addition, vectors showing the fundamental components of distorted waveforms can be displayed to give a visual presentation of the load balance in a 3-phase power supply system.

Spectrum analysis of current and power in inverter output
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Fundamental wave vector display in inverter output
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  • Distorted wave power spectrum analysis
  • With the PZ4000, you don't need a frequency analyzer to perform spectrum analysis on the carrier component of an inverter. Up to now, this type of analysis has been difficult. A major advantage with the PZ4000 is that you can input signals directly without using probes. This removes any error due to probe tolerance.
  • Load balance evaluation for three-phase powered equipment
  • The vector display using the harmonic analysis function lets you visually know the condition of each phase in a 3-phase circuit equipment. This makes evaluation simpler than when calculations are performed manually based on numerical data.
Frequency characteristcs (voltage and current)
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Frequency characteristics (phase angle and zero power factor)
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Linearity (current)
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Name Description File Type  
Bulletin 2573-00E Power Analyzer PZ4000 pdf icon
494 KB
Name Description  
Characteristics of Transient Response from Industrial Robots Characteristics of Transient Response from Industrial Robots Learn More
Evaluating Magnetic Components Evaluating Magnetic Components Learn More
Development and Evaluation of Linear Motors Development and Evaluation of Linear Motors Learn More
Evaluating Starting Characteristics for Fluorescent Lamps Evaluating Starting Characteristics for Flurescent Lamps Learn More
Total Evaluation of an Inverter-Controlled Elevator Total Evaluation of an Inverter-Controlled Elevator Learn More
Short-Term Integration of Load-Changeable Units Short-Term Integration of Load-Changeable Units Learn More
Designing Energy-Saving Appliances Designing Energy-Saving Appliances Learn More
Evaluating Active Filters Evaluating Active Filters Learn More
Evaluating Electrical Vehicle Non-Contract Charging Systems Evaluating Electrical Vehicle Non-Contract Charging Systems Learn More
Transient Power Measurement of a Facsimile Machine Transient Power Measurement of a Facsimile Machine Learn More
Support for Designing Semiconductor Equipment for Saving Energy Designing Semiconductor Processing Tool for Saving Energy Learn More
Evaluating Electrical Vehicles Non-contract Charging Systems Evaluating Electrical Vehicles Non-Contract Charging Systems Learn More
Evaluating DC Power Supply for Office Automation Equipment Evaluating DC Power Supply for Office Automation Equipment Learn More
Power Distribution System Tests for Shorts and Switching Power Distribution System Tests for Shorts and Switching Learn More
Evaluating Inverters and Motors Evaluating Inverters and Motors
Learn More
Evaluating Inverter Output Filters Evaluating Inverter Output Filters Learn More
Evaluating Starting Characteristics of Fluorescent Lamps Evaluating Starting Characteristics for Flurescent Lamps Learn More
Evaluating Inverter-Driven Microwaves Evaluating Inverter-Driven Microwaves Learn More
Name Description  
LabVIEW Drivers for PZ4000 LabVIEW drivers for PZ4000 y-Link

Delta Power Electronics

Delta Power Electronics Center Shanghai, China

"YOKOGAWA has given excellent support in products and services."

Recognizing tremendous marketing and technological opportunities, Delta Power Electronics Center (DPEC) was founded on June 5th, 1999 in Pudong, Shanghai by Delta Group. We believe that for Delta Group-the largest manufacturer of power electronics products-the key to staying at the forefront of power electronics technology lies in the hiring of excellent people, and creating technological innovation. DPEC gathers the top power electronics researchers from academia and industry. Tm Testimo 15
DL1740 Digital Oscilloscopes

These graduates from the top universities in China do development work on high frequency technology, high efficiency topology, magnetic technology, thermal and packaging approaches, optimum control, EMI and EMC technology, and simulation software platforms. The fruits of their efforts will greatly benefit Delta Group and our partners. In the past three years, YOKOGAWA has given us excellent support, products, and services. There are many instruments from YOKOGAWA installed at our center, including DL1740 Digital Oscilloscopes, WT1600 Digital Power Meter, and the PZ4000 Power Analyzer. We look forward to a mutually beneficial relationship in the coming year.  Tm Testimo 16
Visit the Delta Power Electronics Center web site.


Robert Bosch GmbH located in Stuttgart, Germany. The Bosch Development & Research of Hybrid Engines section develops electrical propulsion principles for motor vehicles with combustion engines as well as for hybrid and electrical vehicles. Bosch engineers chose the PZ4000 Power Analyzer for their new project. They liked the high reliability and high accuracy of the PZ4000 which made their project progress smoothly. In addition to high reliability and accuracy, the PZ4000's high common mode voltage, transient mode, and scope mode were features that made Bosch decide to purchase the PZ4000.

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Visit the Bosch web site.

SANYO Electric Corporation

We developped energy-conserving air conditioners by attaching sensors in a room. The sensors detect the presence of people and light to automatically stop airconditioning a room when it isn't being used. I have used other power meters before, but the Yokogawa PZ4000 Power Analyzer's color-display of power values and the transient waveform analysis function are particularly appealing."
Yuichi Takeda
Home Appliances Division,
Sanyo Electric Corp. Japan

Click to visit Tm Pz4000 C11
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Mitsubishi Electric Corp., Fukuyama Works

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Mitsubishi Electric Corp., Fukuyama Works
Measurement & Control Device Manufacturing Dept.
Mr. Masao Shiegshiro, Deputy Manager, Ecology System Products Manufacturing Sect.(right)
Mr. Hiroaki Sumida, Engineering 3rd Gr. (left)

We're in charge of development and quality control for instruments that measure electric power and the energy. With the recent enactment of energy conservation laws and ISO14001, energy-savings has become an important topic in many fields.

The power measurement unit that we're developing, EcoMonitor, monitors the volume of electric power and the energy usage at factories, and determines whether any of that electricity is being wasted. Also, acquired data from multiple locations can be aggregated, observed, and analyzied over a network. We are responsible for maintaining the development and manufacturing quality of these measuring instruments, as well as the market quality which means the degree to which the product can satisfy the customers' requirements.

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PZ4000 monitors measuring results
of the power Measurement unit.
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Previously we were using a power meter that could only display electric data numericaly. But since many new kinds of electric equipments were coming out, and during our work we were seeing more and more waveforms that were extremely distorted. So, we realized we needed a measuring instrument with wide frequency bandwidth that could simultaneously measure power and waveforms. Therefore we decided to bring in thePZ4000 Power View.
We normally measure voltage, current, and power, but harmonics are also generated from the power supply system, so we can view the waveform directly with thePZ4000 and evaluate the system while confirming whether waveforms occurr as predicted. This power analyzer (measuring instrument) allows us to make waveform observations never before possible, and has improved our working efficiency tremendously. Until now we required several oscilloscopes and power meters, but the PZ4000 can measure 3 phase power system and display the waveform and measured values on the screen in real time, which is incredibly convenient. The screen is a color LCD that is very easy to see, and one unit takes up a relatively small space which helps us out.

Products by Mitsubishi Electric Corporation
6 Smart Energy Saving Features
  • Smart Size
  • Smart W Logging
  • Smart Measurement
  • Smart Monitoring
  • Smart Cost
  • Smart Expandability
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Multi-Circuit Energy Measuring
Unit EcoMonitor
Visit the Mitsubishi Electric Corporation web site.

Matsushita Electric Industrial Co., Ltd.

At Matsushita it is our responsibility to develop electronic circuit blocks for fluorescent lamp ballast inverters. We selected the PZ4000 because of its cost-effective performance and its excellent accuracy at high frequencies.
We used Yokogawa's digital power meters before. Only the PZ4000, however, enables observation of both sine waves input to the inverter, and electrical parameters on the same screen. Additionally, the PZ4000 is vital for measuring the harmonic's level used to decrease the harmonic distortion of input current as required by (class C) IEC regulations for lighting fixtures. The PZ4000 is a digital power meter based on a new concept. A single PZ can do a whole range of things from waveform observations to power analysis, and easily save data to a floppy to create reports with a PC."
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Lighting Research & Development Center,
Electronics Circuits Group
Matsushita Electric Works, Ltd.

Matsushita Electric Industrial Co., Ltd.

As designers of power units for general and business use liquid crystal projectors (such as for airplanes), we use the PZ4000 to measure rated power consumption and to check the power control of projector lamps. Power control for lamps is rather difficult. We use the trend analysis function of the PZ4000 to measure power changes, and the trigger function to measure electronic noise. We then try to determine whether noise is negatively affecting the electrodes in the lamps. Very strict design rules are applied to projectors used in airplanes to insure that other flight instruments are not adversely affected. The PZ4000 is very useful for such design as it analyzes power unit harmonics up to 500 orders. Additionally the PZ4000 has helped us to improve power factor circuit performance and energy consumption efficiency. Tm Pz4000 C01
Projection by "TH-L798"

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Mr. Toshiyuki Noguchi - Engineer-System Engineerng Department
Mr. Yasuhiro Kakimoto - System Engineering Department

Panasonic LCD Projectors
High-end Model
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Standard Model
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Low Cost Model
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Tsinghua University

The AC power collection system lab in Department of Electrical Engineering, Tsinghua University is mainly engaged in research on applications of energy savings and inverter variable technology through AC power collection system technology and electric power systems. Presently, our main focus is on AC collection system technology and the evaluation of electric power energy quality. The Yokogawa DL716 and PZ4000 have been extremely useful for many tasks related to this research. In particular, the DL716's large capacity memory makes it easy to capture abnormal phenomena in otherwise normal waveforms. For example, we can run the DL716 for several days, and capture any rare or abnormal signals that may occur during that time.

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With the PZ4000, we primarily analyze the quality of electrical energy, and conduct research in harmonic analysis at energy saving facilities as well as wide bandwidth power metering and analysis. The PZ4000 can also perform measurement in the 2 MHz bandwidth, so we can expand the scope of our research while raising its quality at the same time.

Visit the Tsinghua University web site.


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