ELAN DIGITAL SYSTEMS LTD.
LITTLE PARK FARM ROAD,
SEGENSWORTH WEST,
FAREHAM,
HANTS. PO15 5SJ.
TEL: (44) (0)1489 579799
FAX: (44) (0)1489 577516
e-mail: [email protected]
website: http://www.pccard.co.uk
USBscope50
USER’S GUIDE
ES370
All Trademarks are duly acknowledged.
The USBscope50 is Patent Pending.
REVISION HISTORY
ISSUE PAGES
DATE
04.07.2005
08.07.2005
15.07.2005
NOTES
1
2
3
30
30
31
FIRST ISSUE
Various additional info & spec amendments
Add support for Win98 & DBCS Language’s in
2K/XP
4
5
31
39
20.07.2005
27.09.2005
Various additional info & amendments
General update. Explain trigger modes, Math,
FFTs etc
Elan Digital Systems Ltd.
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USBscope50 USER’S GUIDE Iss5
4.1 Power Requirements ....................................................................................36
4.2 Mechanical ....................................................................................................36
4.3 Environmental ..............................................................................................36
4.4 Performance..................................................................................................37
4.4.2 Static Performance...................................................................................38
4.4.3 Dynamic Performance .............................................................................39
4.4.4 Miscelaneous............................................................................................39
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Disclaimer
This document has been carefully prepared and checked. No responsibility can be
assumed for inaccuracies. Elan reserves the right to make changes without prior notice
to any products herein to improve functionality, reliability or other design aspects. Elan
does not assume any liability for loses arising out of the use of any product described
herein; neither does its use convey any license under its patent rights or the rights of
others. Elan does not guarantee the compatibility or fitness for purpose of any product
listed herein. Elan products are not authorized for use as components in life support
services or systems. Elan should be informed of any such intended use to determine
suitability of the products.
Software supplied with Elan PC-Cards, Compact Flash cards or USB devices is
provided “as-is” with no warranty, express or implied, as to its quality or fitness for a
particular purpose. Elan assumes no liability for any direct or indirect losses arising
from use of the supplied code.
Copyright © 2005 Elan Digital Systems Ltd.
Federal Communications Commission (FCC) Statement
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna
- Increase the separation between the equipment and receiver
- Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
- Consult an Elan authorized dealer or service representative for help.
Elan is not responsible for any radio or television interference caused by using other than
recommended cables and connectors or by unauthorized changes or modifications to this equipment.
Unauthorized changes or modifications could void the user's authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
Listed Products
The models covered by this installation guide are intended only for installation in Listed computers for
use in business or home.
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USBscope50 USER’S GUIDE Iss5
1 OVERVIEW
The USBscope50 is a digital storage oscilloscope that has the
following features:
• Single channel scope with BNC input and USB PC interface
• Each USBscope50 can be stacked to increase channel count (each
requires its own USB connection)1
• 50MSample/sec single shot sample rate
• Timebase from 4ns/div to 4s/div in 1,2,4 steps
• 3000 sample points, 8-bits per sample
• AC and DC coupling
• Input sensitivities with x1 probe are 30mV/div, 300mV/div,
3V/div and with x10 probe are 300mV/div, 3V/div, 30V/div
• 1Meg input impedance, 16pF
• Channel offset control
• Auto and Normal hardware triggering with >, <, +, – modes
• Host powered from USB (200mA typ)
• Stacked configurations of 2,3 and 4 channels are supported
• Stacked configurations allow any channel to be trigger channel
• Stacked configurations have tight phase locking between channels
• Probe compensation output, 3V 1KHz
• Power/activity LED
1 A stacking connector kit is required
2 In stacked configurations the channels share a common ground at the BNC terminals
3 Suitable to measure repetitive signals that are not phase locked with the internal acquisition clock
4 Hardware trigger bandwidth is approximately 60MHz
5 Only in single-shot mode
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2 ABOUT THE USBscope50
2.1 General
The USBscope50 uses a 50MSample/sec 8-bit A-to-D converter.
The A-to-D and front-end circuits that process the input waveform,
and the digital stages that acquire and store the waveform are all
powered from the USB host interface via an isolated supply. This
means that there is no galvanic connection between the BNC ground
(or BNC centre terminal), and the USB interface. When you
measure a circuit and connect the scope ground clip to a voltage that
is not at the same ground potential as the host computer, no current
can flow and the host computer is therefore not forced to be at the
same potential as the circuit under test. This clearly has major safety
advantages. The USBscope50 has been designed so that up to 300V
and the host computer ground.
Each USBscope50 can be used as an independent single channel
scope but to enhance flexibility several USBscope50s can be stacked
together to make a combined 2,3 or 4-channel device. In this case,
each scope is synchronised with the others so that the compound
device acts like a single multi-channel instrument.
Each
USBscope50 still needs its own USB connection and the combined
device shares a common ground between all the BNC connectors i.e.
the channels are isolated from the USB but not from each other.
6 The CAT rating refers to how large a transient over-voltage may be when connected to the circuit in
question. The USBscope50 is designed to handle a certain transient over-voltage between the BNC
and the USB host i.e. across the internal isolation circuits. The CAT II UL rating defines a more
severe environment than CAT I and hence larger transients are possible. This is why the isolation
rating for CAT II is lower than the rating for CAT I. For further information on CAT ratings please
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USBscope50 USER’S GUIDE Iss5
2.2 USBscope50 Architecture
The figure below shows a simplified diagram of the USBscope50.
STACK
CONN
AC/DC
CONTROLLER
BNC
USB
CONTROLLER
USB
COMP
Trigger
DATA
PSU
ATTENUATOR
1Meg
AMP
8-BIT ADC
ISOLATION BARRIER
Figure 2.2-1 USBscope50 Architecture Diagram
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USBscope50 USER’S GUIDE Iss5
2.3 Using More Than One USBscope50
A unique feature of the USBscope50 architecture is that up to 4
In order to use a stacked configuration, you must purchase the
stacking connector kit. This kit comprises 3 long lead connectors
and 1 short lead connector as shown:
2.3.1 Assembling The Stack
To stack the USBscope50 devices, first be sure that none of them are
connected to a USB port.
Before you begin, put the short lead connector to one-side…you’ll
use that one last.
Now, insert one of the long connectors from the top of one of the
scopes (it doesn’t really matter which one). Push the pins of the
connector into the top of the stacking connector from the side where
you can see the top of the black connector down inside the scope.
Be careful when doing this, don’t use too much force or you may
damage the connector pins. Push the long connector all the way in
until it seats down on the scope’s internal connector. You should be
able to see the gold pins about 2-3mm beyond the bottom surface of
the scope. The connectors have no pin orientation…they can go in 2
possible ways round…both are OK.
7 Don’t stack more than 4, the software will reject this.
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