DL7440/DL7480 Digital Oscilloscopes (DISCONTINUED)

Notice: This product was discontinued on Oct 17, 2011. See this replacement product:

This Digital Oscilloscope is used to measure recorded signals during DVD recording evaluation processes. It is highly reliable and used by many research and development companies in their efforts for such R&D processes as comprehensive digital media integrated chipset solutions.

What's New: With the 2.57 firmware and later versions, the new logic probes model: 701988 & 701989 are available.

This analyzer meets various measurement and analysis needs.

  •     Maximum 16 MW recording memory
  •     USB compliant
  •     Ethernet connectivity (optional)
  •     User-defined math (optional)
  •     2 GS/s maximum speed
  •     500 MHz analog bandwidth
  •     Supports 250 MHz logic probe
  •     PC card interface (Type II)
  •     Power supply analysis function (optional)
  •     Serial bus analysis function (optional)

DL7400 Series Models Lineup


DL7440 DL7480
701450 701460 701470 701480
Analog input channels 4 4 8 8
Logic input channels 16-bit
Max. samplimg speed 2 GS/s
Bandwidth 500 MHz
Max. record length 4 MW/ch 16 MW/ch 4 MW/ch 16 MW/ch



Capture All the Signals You Want Easily, Accurately, and Reliably...


One instrument contains everything you need to observe multiple signals on analog/logic mixed circuits:

DL7440: 4 analog channels and 16-bit logic input
DL7480: 8 analog channels and 16-bit logic input

The DL7400 Series includes 4 and 8-channel analog input models. Each model has up to 16-bit logic inputs as standard. All these inputs come in a convenient, benchtop-sized instrument. In additon to capturing up to 16 logic signals, the DL7400 Series lets you simultaneously measure up to 8 analog signals without needing to synchronize two separate oscilloscopes.  The DL7440 and DL7480 SignalExplorer oscilloscopes are designed for users who want an easy, efficient solution in one unit for handling measurements that required two or more units in the past.

Example of Logic Probe Connection
Logic Probe (701980)
Logic Probe (701981)
Example of Logic Probe Connection Logic Probe (701980) Logic Probe (701981)
 8-channel analog display  8-channel analog and 16-bit logic display 16-bit logic display
 8-channel analog display  8-channel analog and 16-bit logic display  16-bit logic display

Large Recording Memory and Quick Zoom for Accurate Waveform Capturing and Monitoring

Even some oscilloscopes with high sampling rates may not be able to accurately capture waveforms if the memory size is not large enough for the required monitoring period. This limitation is due to the necessary drop in sampling rate, which occurs if the recording memory is not long enough. A larger recording memory not only increases the monitoring time, but also enables users to maintain a high sampling rate thus ensuring accurate waveform monitoring. In addition, the zoom function can be used to view enlarged images on one or two segments of a waveform captured in the large memory. Main and dual zoom display
Main and dual zoom display
Main and dual zoom display

All-Points Display and Fast Screen Updates Make Sure You Won’t Miss Abnormal Signals

When working with data captured in the large recording memory, the amount of information appearing on the display varies greatly depending on how the data are presented. The differences occur depending on whether you choose to display all points in a captured waveform, or just major values, such as maximum and minimum values, in a given segment on the waveform. The DL7400 Series provides fast screen updating in all-points display mode, so you won’t miss abnormal phenomena or have slow responses to instrument controls. All-points display
All-points display
Main and dual zoom display
Main and dual zoom display

A Variety of Functions to Help You to Find Useful Information in Large Amounts of Data

When an abnormal signal is displayed on the screen, does it disappear before you can press the STOP key?

History Memory

The history memory function divides the large recording memory into a number of blocks and automatically saves up to 4096 previously captured waveforms. You can increase the number of screens that can be saved to history memory by setting a shorter record length.

History Search

The history search function is useful for quickly finding abnormal waveforms in the large amounts of waveform data stored in history memory. This function lets you automatically search for desired waveforms based on whether or not a signal passes through a user-defined area on the screen. You can also conduct searches based on waveform parameters.

History Statistics

Calculates statistical information based on the parameter values for waveforms stored in history memory. This function calculates and displays a parameter’s maximum value, minimum value, average value, and standard deviation. You can check the parameters for every waveform in history memory.

Measuring Periodically Fluctuating Amplitudes

Cycle Statistics

Automatically calculates the maximum value, minimum value, average value, and standard deviation of selected waveform parameters for each period of a signal. You can even find the period corresponding to the calculated maximum and minimum values and display that period in the zoom window. In some applications, like with a PWM (pulse width modulation) control signal, you may need to determine information about each waveform period for long amounts of time. The DL7400 Series with its long memory, lets you analyze a long waveform, period-by-period, based on the period of a reference signal.

Example Applications
  • Amplitude, period, and duty ratio for each period in various modulation signals
  • Current, voltage, and period for each switching cycle as the load fluctuates in a switching power supply
  • Output level of each sensor per revolution in engine or motor
  • Clock count in serial data


How can I quickly count a large number of pulses in waveform?


Pulse Count

Automatically counts the number of pulses in the waveform data between cursors. The threshold level for recognizing a single pulse is user-definable, so you can reliably compute pulses even in signals with unstable levels. With the DL7400 Series, you’ll never again have to manually count pulses on screen or on a stack of printouts.

Example Applications
  • Stepping motor revolution pulses
  • Optical disk tracking error signals
  • Interrupt signals from microcontrollers
  • Clock count in serial data


Simple and Enhanced Triggers


The many trigger types in the DL7400 Series enable stable monitoring of a wide range of waveforms.


Power Analysis Functions (with the /G4 option)¹


Easy, automatic calculation of power supply parameters including: switching loss, power, power factor, impedance, energy, and more.

 From the main power analyze setup menu, you can select which channels will be used for power measurements. For each channel selected, you can choose from a number of waveform parameters specific to power analysis. (For example, I2t can be calculated for fuse measurements).  Additionally from the main power analyze setup menu, you can jump to the Auto Deskew function or the Power Analysis Math and Parameter Measurement menus.

¹ The Power Analysis Functions (/G4 option) includes the User-Defined Math (/G2 option).
Automatic parameters available on voltage channels
Automatic parameters available on voltage channels


Measure and display how parameters change for each waveform period


Fluctuations in waveform parameter values of acquired signals are displayed on a plot.  For example, on an active power factor correction circuit, you can simultaneously display fluctuations in the switching frequency and switching current of the modulating signal relative to the commercial power supply and input voltage.  Also, you can measure commercial power supply voltage and current and then display the trend of power consumption over each cycle.

You can measure commercial power supply voltage and switching voltage/current in active power correction circuits, and also plot fluctuations in switching frequency and switching current.


Harmonic analysis of the power supply current allows for easy comparison to EN61000-3-2 standards²


 Limit values based on EN61000-3-2 class A, B, C, and D can be superimposed with measured data.  Limit values and numeric data values are displayed together in a list. Data exceeding the limit value are flagged.

² You can use the DL7400 for pre-complaince testing.

Use Yokogawa's WT2000 Digital Power Meter for standards compliance testing.
 Analysis Results Display and List Display
Analysis Results Display and List Display


Easily adjust the skew between voltage and current probes


Adjust for differences in electrical length (skew) between voltage probes and current probes.

This is useful for switching loss measurements and other measurements affected by voltage/current signal skew. Deskew can be performed automatically or manually for each channel.

Deskew signal source (701935)
Output voltage: Approx. 0 to 5 V
Output current: Approx. -100 to 0 mA
Output freq.: Approx. 15 kHz
Falling time: Approx. 15 nsec
Deskew signal source (701935)
100 MHz Differential Probe (701921)
100 MHz Differential Probe (701921)
50 MHz Current Probe (701933)
50 MHz Current Probe (701933)


User-Defined Math (with the /G2 option)


The DL7440 and DL7480 include addition, subtraction, multiplication, binary conversion, inversion, differentiation, integration, and power spectrum as standard calculation functions. With the optional user-defined calculations, you can define equations using arithmetic calculations as well as a variety of other functions, including trigonometric functions, differentials, integrals, square roots, digital filters, six different FFT functions, and pulse width calculations. In addition, calculation results can be specified as parameters for other equations, so the DL7440 and DL7480 can directly handle complex computations that formerly required data to be uploaded to a PC for computation.

Serial Bus Analysis Functions (with the /F5, /F7 or /F8 options)

Three serial bus analysis functions (I2C, CAN, and SPI) are available together "in one instrument."

These options provide physical-layer observation and analysis of serial bus signals. Evaluations from such analyses are essential to solve communication failures resulting from signal deterioration and unpredictable external noise.

I2C Bus Trigger and Analysis

I2C bus signals (SCL and SDA), used extensively in home electronics such as analog and digital televisions, and video cameras, and in communications equipment such as mobile phones can be captured with specialized triggers and displayed as waveforms. Triggers can be based on start conditions, userspecified address and data patterns (Data 1 and Data 2), non-ack (when acknowledgement is not received), and other conditions for reliable capturing of I2C signals. You can also set triggers based on combinations of I2C bus trigger conditions (SCL and SDA) and signal inputs on channels 3-8 (combination triggers).

Captured waveforms can be analyzed in a time-series manner, and the analysis results at each byte is displayed in a list along with the presence/absence of ACK field codes. When an analysis result is selected with the cursor, the corresponding portion of the waveform is automatically enlarged in the zoom area.

You can quickly search the analyzed results for a specific address or data pattern from within the analysis results.
Two pairs of I2C busses can be input at the same time (SCL: CH1 & CH3; SDA: CH2 & CH4), and then analysis can be performed alternately on either bus.


I2C Address and Data Trigger Setup Menu I2C Bus Analysis Results Display
I2C Address and Data Trigger Setup Menu I2C Bus Analysis Results Display


CAN Bus Trigger and Analysis

Using dedicated triggers, CAN bus signals can be captured and displayed as waveforms. (The CAN bus option supports both highspeed and low-speed CAN. CAN is used widely in the internal communication busses of automobiles, FA machinery, medical equipment, and other devices.) Analysis performed according to the CAN protocol can be displayed in a list together with the waveforms. Two types of differential probes are available for measuring CAN bus signals (sold separately).

Trigger conditions can be set from fields or combinations of fields in CAN data frames (ID, Data, RTR bits, etc.), enabling reliable capturing of CAN bus signals. Triggers can also be activated on an error frame.

Captured CAN bus waveform data can be analyzed in a timeseries, and the ID and Data at each frame displayed in hexadecimal or binary notation. Frame and error types can also be displayed simultaneously. By selecting a frame with the cursor, you can display an enlarged version of the corresponding portion of the waveform on the screen.
Search the analysis results for a specific CAN frame—ID, Data, Remote (RTR) or Error frame. The specified field is automatically identified and displayed in the on-screen zoom window.

A waveform showing the stuff bit position can also be displayed.
Hight-speed CAN (ISO11898)
Dominant (0), Recessive (1)
Dominant (0), Recessive (1)
500 MHz Differential Probe (701920) 200 MHz Differential Probe (701922)
500 MHz Differential Probe (701920) 200 MHz Differential Probe (701922)
CAN Bus Trigger Setup Menu
CAN Bus Trigger Setup Menu
CAN Bus Analysis Results Display
CAN Bus Analysis Results Display


SPI Bus Trigger and Analysis*


Signals in the SPI bus, a synchronous 8-bit serial bus widely used for inter-IC and data communication in embedded systems and in other applications, can be captured using dedicated triggers. The captured results are then analyzed based on the SPI protocol and can then be displayed together with the waveform.

Triggers are activated on user-defined conditions of the MOSI (master output slave input) and/or MISO (master input slave output) data signals on the SPI bus. Data strings of 1-8 bytes can be defined.

Two types of trigger patterns can be set (A pattern, B pattern, or both), allowing a trigger to be activated, for example, upon data read out from the slave (MISO, pattern B) in response to a specific command from the master (MOSI, pattern A).

Data analysis results and SS (slave select) bits can be displayed in a list together with the waveforms.

After analyzing the acquired data, you can perform high speed searches for a specific MOSI or MISO data pattern (1-8 bytes).
Example of a connection to a SPI bus
Example of a connection to a SPI bus


SPI Bus Trigger Setup Menu SPI Bus Analysis Results Display* SPI Bus Data Search Setup Menu*
SPI Bus Trigger Setup Menu SPI Bus Analysis Results Display* SPI Bus Data Search Setup Menu*
* The SPI bus analysis and search functions are standard features. The SPI bus triggers are available only as an option.



Connecting with PC via WebDAV* 


Connection with a Wide Range of Peripherals such as PC, Printer

Using the Windows XP WebDAV* function, the DL7400's internal storage media drives (floppy, ZIP®, PC Card) can be mounted as a PC network drive.
Using your PC, you can then access stored data on these drives as easily as you would access data on the PC's own hard drive. This feature does not require any external FTP client software.

* Web-based Distributed Authoring and Versioning


Web Server
With an Ethernet connection, you can perform various functions using Internet Explorer.


  • FTP
    Easily copy and paste files from the internal storage device in the DL7400 Series. This internal storage device functions as one of your PC file servers.
  • Data Capture
    Perform actions such as waveform monitoring, uploading settings, and starting/stopping measurements.
  • Measurement Trend
    Automatically opens Excel, then periodically downloads waveform parameter values and graphs them. Easily monitor parameter trends during extended-period measurements.
  • Printng on a Network Printer
    The screen image can be printed on a network printer in the same way as you would print to the internal printer or a USB printer.
  • Transmitting E-mails
    The information of the DL7440/7480 can be transmitted periodically in an e-mail message to a specified mail address.





Peripheral Device Connections
  • The DL7400 Series can be completely controlled using a USB mouse.
  • File names can be entered using a USB keyboard.
  • Connect a USB printer for color printouts.
  • Connect a USB flash memory for saving a variety of data (ACQ data, setup data, image data).

PC Connection
You can create a PC program to remotely control your DL7400 Series through a PC, similar to remote control operations through a GP-IB interface.
Controlling the DL7400 Series using a USB mouse
Controlling the DL7400 Series using a USB mouse
Controlling the DL7400 Series using a USB mouse


Outputting and Viewing Images


The PRINT key lets you print screenshots to the built-in printer, a USB printer, or network printer. Simply press the IMAGE SAVE key to save a screenshot to a PC card or other storage device. Screenshots can be saved in BMP, TIFF, PS, PNG, and JPEG formats. Captured images can be easily checked as thumbnail icons. File names are displayed together with the thumbnail images, allowing you to check files and immediately change their names or delete them if necessary.

Rear Panel

Tm Dl7400 30



  • Probe Power Connectors
    Probe power connectors for active probes and for the 701935 Deskew signal source.  The DL7400 Series comes standard with 4 connectors.  4 additional connectors can be added as an option.
  • RGB Video Signal Output Connector
    Outputs a video signal for viewing waveforms on an external monitor.
  • USB-PC Connector
    Complies with USB Rev 1.1.
  • USB Peripheral Device Connectors
    Complies with USB Rev 1.1.
    Type A connectors: 2 ports compatible with USB Flash memory*, HD drive*, USB printers, keyboard and mouse.
    *: Available only when the following description is included in the Misc → Overview menu.
    "USB Storage Yes"
  • SCSI (optional)
  • Ethernet (optional)
    Complies with 100BASE-TX and 10BASE-T.
  • PC Card Interface
    Flash ATA card (PC card Type II)
  • External Trigger Input/External Clock Input/Trigger Gate Input
    Inputs DC to 100 MHz signal for external triggering (external trigger input).
    Inputs clock signal from 40 Hz to 20 MHz from exterior (external clock).
    Trigger occurrence can be controlled using external signal (trigger gate input).
  • Trigger Output
    Outputs TTL level trigger signal.
  • Logic Inputs
    Logic probe connectors.  Two 8-bit logic probes can be connected. (701980 and 701981 logic probes sold separately)



Model Description
701480 DL7480 with 8 CH input and maximum 16 MW memory
701470 DL7480 with 8 CH input and maximum4 MW memory
701460 DL7440 with 4 CH input and maximum 16 MW memory
701450 DL7440 with 4 CH input and maximum 4 MW memory

700924 Differential Probe 1400V / 100 MHz

  • Differential oscilloscope probe
  • 100 MHz
  • ±1400 V (DC + ACpeak) at 1000:1
  • Internal battery or probe power supply
  • Oscilloscopes, ScopeCorders

700939 Active FET Probe 10V / 900 MHz

  • 700939 Active FET Probe
  • 900 MHz Active FET Probe Circuit
  • 10:1, ±10 V (DC + ACpeak) FET Input Active Probe
  • 1.5 m


701920 Differential Probe 12V / 500 MHz

  • 701920 Oscilloscope Differential Probe
  • DC to 500 MHz
  • 10:1
  • Max. Input Voltage:(to ground) ±40 V (DC + AC peak)
  • Max. Differential Voltage ±12 V (DC + ACpeak)
  • Probe power supply
  • 50 Ω input system oscilloscope

701921 Differential Probe 700V / 100 MHz

100 MHz, 100:1/10:1, Max. Differential Voltage: ±700 V (DC + ACpeak) at 100:1 attenuation, Probe Power: Internal battery or probe power supply

701922 Differential Probe 20V / 200 MHz

200 MHz, 10:1, Max. Differential Voltage: ±20 V (DC + ACpeak), Probe Power: probe power supply. Works with 50 Ω input system oscilloscope.

701930 Current Probe 10 MHz / 150 ARMS

  • 701930 Current Probe 10 MHz / 150 ARMS
  • Powered by Yokogawa Digital Oscilloscopes, Scopecorders or external power supply

701933 Current Probe 50 MHz / 30 ARMS

  • 701933 50 by 30 current probe
  • Powered by Yokogawa Digital Oscilloscopes, Scopecorders or external power supply

701941 Miniature Passive Probe

500 MHz, 10:1, 400 Vrms, 1250 V transient over-voltage CAT I, 300 Vrms CAT II, 1.2 m
For DL1700E, DL7400 series

701942 Miniature Passive Probe

350 MHz, 10:1, 400 Vrms, 1250 V transient over-voltage CAT I, 300 Vrms CAT II, 3 m
For DL1700E, DL7400 series

701944 High Voltage Passive Probe 1000Vrms / 400 MHz

  • 701944 High Voltage Passive Probe 1000Vrms / 400 MHz
  • For DL1700, DLM2000-6000, DL6000, DL9000, SB5000 series

701945 High Voltage Passive Probe 1000Vrms / 250 MHz

  • 3m High Voltage Probe (oscilloscope)
  • DC to 250 MHz bandwidth 
  • 100:1 attenuation 
  • Max Input 1000 Vrms CAT II 4000 V transient over-voltage CAT I

B9852HF Basic accessories set for the 701941 probe

The B9852HF contains the following eleven(11) kinds of accessories: Insulation cap, IC cap, BNC adapter, Rigid tip, Spring tip (Ø: 0.80 mm), Spring tip (Ø: 0.38 mm), Ground spring, Adjustment tool, Pincher tip, Standard ground lead, Color coding rings. PBL5000.

Rack Mount Kit (for EIA rack) 701965

Hardware for extending rack capability. Detailed dimensions follow.

701935 Deskew Signal Source

For use with the Power Supply Analysis option (/G4).

B9969ET Soft case for the DL7400 series

Ideal for storing accessories (probes, etc).

366924 BNC to BNC 1m Cable

  • 366924 BNC to BNC cable for oscilloscope 
  • 1m BNC wire
  • Simultaneous measurement with 2 units
  • Input external trigger signal

366925 BNC to BNC 2m Cable

BNC-BNC 2m. For connection to simultaneously measurement with 2 units, or for input external trigger signal.

B9852ES Logic Probe IC Pin Clips

  • B9852ES Logic Probe IC Pin Clips
  • Attach to tips of logic probe (701988 or 701989) or mini-clips (B9852CR)
  • Clip contiguous 0.5-mm pitch terminals
  • 10 clips included

B9850NX Legacy DL/DLM Printer Paper

Quality paper for the DLM6000/DL9700/DL9500/DL1700(E)/DL1600/DL1500 and DL7400


We do not have an instruction manual describing the *.WDF file format structure like we did for the *.WVF files.

We provide a list of support options with more details. 

Looking for more information on our people, technology and solutions?

Contact Us

Precision Making