Agilent
Agilent
U2781A Six-Slot USB Modular Instrument Chassis
Data Sheet
Features
• Six USB module slots
• System Synchronous Interface
(SSI)
• Star trigger
• Internal and external 10 MHz
reference clock
• Trigger-in and trigger-out
signals
the external trigger input and slotted
USB modules.
Introduction
• SCPI commands
• IVI-COM driver compatibility
• USBTMC 488.2 Standards
• USB 2.0 high-speed interface
• Rackmount kit available as an
option
Agilent U2781A USB modular
instrument chassis is a 4 U-high
chassis with six USB module slots.
This portable chassis provides
housing for up to six Agilent U2300A
Series USB modular multifunction dataacquisition (DAQ) devices. This further
expands Agilent’s range in PC-based
data-acquisition solution, especially in
the research and development (R&D),
design-validation, and manufacturing fields, where engineers use DAQ
extensively.
The U2781A modular chassis is an AC
powered device and is equipped with
an external 10 MHz reference clock and
external trigger-in and trigger-out
functions.
Easy to Use
The USB 2.0 high-speed interface gives
the device plug-and-play and hot-swapping connectivity.
High-Density Data Acquisition
The U2781A modular chassis allows an
expansion of up to 384 channels when
slotted with the U2300A Series DAQ
devices, providing a high- density data
acquisition solution.
Triggering Using Star Trigger
Bus
The U2781A USB modular instrument
chassis comes with star trigger bus,
which offers precise synchronization
between USB modules and the external
trigger signal. The star trigger bus provides dedicated trigger lines between
2
Users can also achieve precise
triggering between each USB module
via the synchronized routing of the star
trigger.
System Option
The U2781A modular instrument
chassis has an optional mountable
rackmount kit. This allows a better
setup when it is integrated into a test
system.
Compatible with wide range of
ADEs
The Agilent U2300A DAQ devices are
compatible with a wide range of
Application Development Environments
(ADE). This minimizes all the time taken
by R&D and manufacturing engineers
to use the devices in different software
environments as they can program
directly using SCPI commands.
Listed below are the popular
development environments and tools
that the DAQ device is compatible with:
• Agilent VEE and Agilent T&M Toolkit
• Microsoft Visual Studio.NET, C/C++
and Visual Basic 6
• LabVIEW
• MATLAB® (Agilent U2300A Adaptor
is available at www.agilent.com/find/
U2300A)
For more information, please visit www.
agilent.com/find/U2300A.
Product Characteristics and General Specifications
Product Outlook and Dimension
Front View
REMOTE INTERFACE
• Hi-Speed USB 2.0
• USBTMC class device
POWER CONSUMPTION
• 400 VA maximum
• Installation Category II
OPERATING ENVIRONMENT
197.00 mm
• Operating temperature from 0 °C to +55 °C
• Relative humidity at 15% to 85% RH (non-condensing)
• Altitude up to 2000 meters
• Pollution Degree 2
• For indoor use only
STORAGE COMPLIANCE
270.00 mm
–20 °C to 70 °C
SAFETY COMPLIANCE
Rear View
Certified with:
• IEC 61010-1:2001/EN 61010-1:2001 (2nd Edition)
• USA: UL61010-1: 2004
• Canada: CSA C22.2 No.61010-1:2004
EMC COMPLIANCE
• IEC/EN 61326-1 1998
• CISPR 11: 1990/EN55011:1991, Class A, Group 1
• CANADA: ICES-001: 1998
• Australia/New Zealand: AS/NZS 2064.1
ACOUSTIC EMISSION
• Sound pressure level: 45.5 dB(A)
• Sound power level: 56.6 dB(A)
SHOCK AND VIBRATION
Side View
Tested to IEC/EN 60068-2
DIMENSION (WxDxH)
270.00 mm x 271.20 mm x 197.00 mm
WEIGHT
• 3.7 kg (without any modules slotted in)
• 6.0 kg (with maximum six modules slotted in)
WARRANTY
Three years
System Requirements
271.20 mm
PROCESSOR
1.6 GHz Pentium IV or higher
OPERATING SYSTEM
Standard Shipped Items
One of the following Microsoft® Windows® versions:
• Windows XP Professional or Home Edition (Service Pack 1 or later)
• Windows 2000 Professional (Service Pack 4 or later)
• USB Extension Cable
• Agilent U2781A USB Modular Instrument
Chasis Quick Start Guide
• Agilent USB Modular Instrument
U2300A & U2700A Series Product
Reference CD-ROM
• Agilent Automation-Ready CD (contains
the Agilent IO Libraries Suite)
• Functional Test Certificate
BROWSER
Microsoft Internet Explorer 5.01 or higher
AVAILABLE RAM
512 MB or higher recommended
HARD DISK SPACE
1 GB
PREREQUISITES
• Agilent IO Libraries Suite 14.2[1] or higher
• Agilent T&M Toolkit 2.1 Runtime version[2]
• Microsoft .NET Framework version 1.0 and 2.0[2]
Optional Accessories
• U2905A rackmount kit for the U2781A 6-slot
USB modular instrument chassis
[1] Available in Agilent Automation-Ready CD
[2] Bundled with Agilent Measurement Manager software application installer
3
Electrical Specifications
Power Supply AC Input
Input voltage range
100 to 240 VAC
Input frequency range
50 to 60 Hz
Power consumption
400 VA maximum
Efficiency
75%
Power Supply DC Output
Output rated voltage
12 VDC
Max output rated current
16.7 A
Max output rated power
200 W
Over voltage protection
13.2 to 16.2 V
Internal 10 MHz Reference Clock
Accuracy
25 ppm for operating range
Slot to slot skew
350 ps
External 10 MHz Reference Clock
Auto detection level
Yes
Input frequency range
10 MHz
Input magnitude
100 mVpp to 5 Vpp (sine/square wave)
Input impedance
50 Ω ± 5 Ω
Damage level
10 Vrms
External Trigger In
Compatibility
TTL
VIH (Positive threshold voltage)
2.0 V
VIL (Negative threshold voltage)
0.8 V
Hold time
8 ns pulse width
Input voltage range
0 to 5.0 V
Slot to slot skew
350 ps
External Trigger Out
VOH
2.9 V
VOL
0.1 V
Output voltage range
0 to 3.3 V
4
Mechanical Specifications
Physical Layout
Number of USB module slots
6
Dimension of each module slot
25.40 mm (W) x 174.54 mm (D) x 105.00 mm (H)
Dimension of chassis
270.00 mm (W) x 271.20 mm (D) x 197.00 mm (H)
Weight
3.7 kg
Power LED
ON/OFF type
USB Backplane
Connector
55 pins Ernet male type C
Input signals
External 10 MHz clock in (BNC connector)
External trigger in (BNC connector)
Output signal
Trigger out (BNC connector)
Cooling Fan
Number of fans
2
Fan speed
3300 rpm ±10%
Noise
37 dB(A)
Power (each fan)
2.52 W
5
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Revised: March 27, 2008
Product specifications and descriptions
in this document subject to change
without notice.
© Agilent Technologies, Inc. 2006 - 2008
Printed in USA, May 8, 2008
5989-5762EN
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