• 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

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

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
100 MHz Differential Probe (701921)	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

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)
	500 MHz Differential Probe (701920)	200 MHz Differential Probe (701922)
	CAN Bus Trigger Setup Menu
	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

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

Ethernet

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.

USB

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

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

• 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)