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USB-6525 データシート(PDF) 2 Page - National Instruments Corporation

部品番号 USB-6525
部品情報  Small, portable digital I/O device / Eight channel-to-channel optically isolated inputs
Download  5 Pages
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メーカー  NI [National Instruments Corporation]
ホームページ  http://www.NI.com
Logo NI - National Instruments Corporation

USB-6525 データシート(HTML) 2 Page - National Instruments Corporation

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Industrial Digital I/O Device for USB – 60 V, Channel-to-Channel Isolated
2
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)
Isolation
Isolation is a form of built-in signal conditioning that provides an
extended voltage range for direct connectivity to industrial sensors and
actuators. The USB-6525 provides channel-to-channel isolation where
each channel is physically and electrically separated from the others.
Isolation provides three main benefits:
1. Safety from hazardous high voltages and transients
2. Rejection of common-mode voltages
3. Removal of ground loops
Safety from High-Voltage Transients
Isolation electrically separates high-voltage front-end channels from
each other and the low-voltage back end of the USB-6525. Signals
are passed between the two sections of the device using optocouplers.
By separating the two sections, any voltages within the isolation
specifications are prevented from entering the USB bus section or other
channels. Isolation provides protection for the user, data acquisition
system, and measurement data.
Common-Mode Voltage Rejection
A voltage common to both sides of a differential circuit pair is
called common-mode voltage. This phenomenon is typical in noisy
environments containing machinery and inductive loads. The differential
voltage across the circuit pair is the desired signal, whereas the common
voltage signal is the unwanted signal that may have been coupled into
the transmission line. The USB-6525 can measure signals from lines with
signal plus common-mode voltage of up to 60 VDC.
Ground Loop Removal
Ground loops are the most common source of noise in data acquisition
applications. They occur when two connected terminals in a circuit are
at different ground potentials, causing current to flow between the
two points. This additional voltage can cause significant error in the
measurement. When a ground loop exists, the measured voltage is
the sum of the signal voltage and the potential difference that exists
between the signal source ground and the measurement system ground.
This potential is generally not a DC level; therefore, the result is a noisy
measurement system. By offering an isolated floating ground on the
front end, the isolated USB-6525 devices are able to prevent ground
loops from forming.
Software
National Instruments measurement services software, built around
NI-DAQmx driver software, includes intuitive application programming
interfaces, configuration tools, I/O assistants, and other tools designed
to reduce system setup, configuration, and development time.
National Instruments recommends using the latest version of NI-DAQmx
driver software for application development in National Instruments
LabVIEW, LabWindows/CVI, and Measurement Studio. To obtain the
latest version of NI-DAQmx, visit ni.com/support/daq/versions. NI
measurement services software speeds up your development with
features including:
• A guide to create fast and accurate measurements with no
programming using DAQ Assistant
• Automatic code generation to create your application in LabVIEW;
LabWindows/CVI; LabVIEW SignalExpress; and Visual Studio .NET,
C/C++/C#, or Visual Basic using Measurement Studio
• Multithreaded streaming technology
• More than 3,000 free software downloads to jump-start your project
available at ni.com/zone
• Software configuration of all digital I/O features without hardware
switches/jumpers
• Free LabVIEW SignalExpress LE data-logging software
The USB-6525 is compatible with the following versions (or later) of
NI application software – LabVIEW, LabWindows/CVI, and Measurement
Studio versions 7.x or LabVIEW SignalExpress. You can also use your NI
digital I/O device with ANSI C, Microsoft Visual C++, Visual Basic, and
the Microsoft .NET languages C# and Visual Basic .NET. The USB-6525 is
not compatible with the Traditional NI-DAQ (Legacy) driver.
Ordering Information
NI USB-6525 ..........................................................................779640-01
Includes NI-DAQmx software, LabVIEW SignalExpress LE data-logging software, and
a USB cable.
NI USB-6000 Series Prototyping Accessory ........................779511-01
Includes breadboarding area with cover and strain relief.
BUY NOW!
For complete product specifications, pricing, and accessory
information, call 800 813 3693 (U.S.) or go to ni.com/usb.


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