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MODEL 4502
4384 Enterprise Place, Fremont, CA 94538-6365
Telephone: (510)490-2300
Fax: (510)490-8493
Website: www.ascor-inc.com
ASCOR Model 4502 Switches
Model 4502
The Model 4502 is a sister to the
Model 4501. It is a dual wire switch
that provides very high performance
for single-ended or differential
signals. It has bandwidths exceeding
25MHz. It has sixteen dual- wire
3-pole star switches combine with
sixteen dual-wire 4-pole star switches
linked together and joined into a 8
by 10 dual-wire matrix.
The matrix provides 10 analog
bus connections to the Series 4000
Signal Guard analog back plane.
This module is great for switching
of different types of dual-wire or
single wire signals from resources
to the interface connector or to the
analog matrix. Digital or analog
instruments can be connected
directly to the interface or routed
through the matrix in order to reach
another switch module.
MODEL 4502
ASCOR Model 4502
Switches
Features
Bandwidth Performance:
s
3-pole dual-wire star: >200 MHz
s
4-pole dual-wire star: >200 MHz
s
Star switch thru matrix: >35 MHz
ASCOR Is The One Switch Source For
Multiple Switching Solutions.
Traditionally ATE systems have been
designed using switching components
wired together to form a system switch.
This is especially true of VXI switch
modules that are combined through
external wiring components. The
instrumentation then requires additional
wiring to be integrated into this maze of
switches. The biggest drawbacks to this
approach are the loss of performance due
to mismatched impedance, signal loses
due to long cables and higher resistive,
capacitive or inductive loads due to poor
wiring design. It is always ideal to design
a good switch system to minimize
cabling and match impedances.
ASCOR has designed a new family
of switches that does just that using the
existing 4000 series multi-slot carrier.
Replacing the traditional VXI card front
panel with a standard Virginia Panel
TAC connector allows the Device Interface
Board (DIB) to mate directly to the 4500
Series switch card. Test engineers no
longer need to install a custom cable
assembly between the individual switch-
card front panels and the DIB interface.
The 4500 Series ensures test signal integrity
by shielding all signal connections starting
from the internal switch assemblies
through impedance matched transmission
lines to the TAC connector interface. The
standardized interfaces allow convenient
card removal from the front for rapid
maintenance and configuration changes.
Providing high density, high signal
integrity connections to the test device
has become the principle test system
design challenge. The 4500 Series
eliminates the custom cabling funnels,
which were re-engineered for every test
system thereby improving the customers
time-to-market and test design cycle-time
while simultaneously reducing design
risks and test system costs in construction,
software development and configuration
management.
Signal Guard is a 600MHz analog bus
interface connecting all Ascor 4500 Series
VXI cards. Shielded transmission lines
and relays ensure high signal integrity
by preventing noise ingress and crosstalk
within the switching system. Impedance
matched transmission lines minimize the
effects of internal, high frequency signal
reflections. No custom cabling is required
between the switch cards. Signal Guard
also eliminates customized cabling
between switches and instrumentation.
Signal Guards high bandwidth, modular
interface saves engineering time and
avoids the risk of cabling problems
degrading effective instrumentation
performance.
The Ascor 4000 Series Switching
System also simplifies software design,
coding and driver interface tasks. The
4000 Series cards assemble into a carrier
cage prior to insertion in the VXI
chassis. The carriers backplane interface
allows the entire switching system to
connect with a single VXI address.
Software developers no longer need account
for the highly variable effects of multiple
switch addresses, multiple driver
interfaces, multiple card-to-card switch
interconnections, variable path settling
times, multiple device interface variations
and configuration dependent query/error
tracking functions.
All Ascor 4000 Series switch products
are register-based devices and are supplied
with software drivers for LabVIEW,
LabWindowsCVi, C, C++, and Visual
Basic. Ascors VXI cards conform to
European standards for CE marking.
Ascor is the one switch source for
multiple switching solutions.
4000 Series Multi-Slot Carrier 4384 Enterprise Place, Fremont, CA 94538-6365
Telephone: (510)490-2300
Fax: (510)490-8493
Website: www.ascor-inc.com
Custom Solutions Through Engineering
Innovation
ASCOR, founded in 1987 and head-
quartered in Californias Silicon
Valley, provides a complete line of
VXI Switching and Digital Modules
for industrial, medical, scientific
and governmental automatic test
applications. Ascor VXI products are
the quietest, cleanest, highest density
VXI modules commercially available.
S P E C I F I C A T I O N S
MODEL 4502
ASCOR Model 4502
Switches
Resource Connector
1 of 64
Receiver Connector
Model 4502, Part 1
Four Each 3 Pole Stars (4 of 16)
Resource Connector
2 of 64
Receiver Connector
Resource Connector
3 of 64
Receiver Connector
Resource Connector
4 of 64
Receiver Connector
Resource Connector
1 of 64
Receiver Connector
Resource Connector
4 o 64
Receiver Connector
Resource Connector
3 o 64
Receiver Connector
Resource Connector
2 o 64
Receiver Connector
Model 4502, Part 2
Four Each 4 Pole Stars (4 of 16)
Resource
to
Receiver
200 MHz
Receiver
Analog Bus
Receiver
35 MHz
1.5
Amp
Carry
Analog Bus
1- 4 5- 8 9-10
I
1
I
3
I
7
4 Pole
Star
3 Pole
Star
3 Pole
Star
4 Pole
Star
4 Pole
Star
4 Pole
Star
I
2
I
4
3 Pole
Star
3 Pole
Star
I
5
I
6
Receiver

1-4 1-4

5-8

5-8 9-12 9-12

13-16 13-16

17-20 21-24 25-28 29-32
Tap 1 - 4
Feed
Through
I
8
Feed Through 1-4 5-8 9-12 13-16 17-20 21-24 15-28 28-32
Resource Top Connector
DPDT
Typical
2ea SPST
Typical
DPDT
Typical
3-pole dual-wire star: > 200MHz 4-pole dual-wire star: > 200MHz
Star switch thru matrix: > 35MHz
Connect to Station Resources
Troubleshooting
Busses 9 - 10
Model 4502 Block Diagram
100 Ohm Resource Card
DPST
Series 4000 Analog Bus
1 .... 4
9 10
5 .... 8
Receiver Connector TAP 1 2 3 4
Local
Buss
01 - 04
05 - 08
09 - 12
13 - 16
17 - 20
21 - 24
25 - 28
29 - 32
Model 4502, Part 3
Example: Switching Resource
Measurement System, Model 4501 and 4502
Twelve
100 Ohm
Analog
Buss
R
ece
i
v
e
r
768
4 (256 Times)
50 Ohm
and
DMM
Resource
Distributor
50 Ohms
100 Ohms
100 Ohm Station Resources
100 Ohm
Resource
Switching
512
4 (256 Times)
2 (512 Times)
64
50 Ohm Station Resources
16
50 Ohm DSO
4
100 Ohm DMM
4
ASCOR Is The One Switch Source For
Multiple Switching Solutions.
Summary For 4500 Family
s
Optimum system configuration
switching
s
Maximum perform far exceed
standard VXI designs
s
Coaxial, single wire, dual wire,
twisted pair switching
s
Integrated with built-in adapter
to Virginia Panel Receiver
Mechanism
s
Controled Impedance
s
Shielded and floating analog
ground utilized.
s
Dual VXI chassis with mechanism
available
© 2002 ASCOR Incorporated. Specifications subject to change without notice. 10/31/02