Manual 07500770
Model 3000-46
Page 9
O
peration Manual
Chapter 3
Functional Description
3.1
Introduction
This User Guide provides a basic description of the Model 3000-46, Flex Switch module. Also included
are installation and input connection procedures, programming information, service and maintenance
information.
3.2
General Description
The Model 3000-46 is a versatile switch array for those who need mix signal capability. The module has
sixty four (64) DPST coaxially shielded relays for dual wire isolation. These relays can be used to switch
signal paths to a digital subsystem. Bandwidth of these paths is greater than 100 MHz. At the input of
these isolation relays are sixteen (16) 8x1 trees which are arranged as eight (8) pairs of 8x1 trees with
individual control of the + and - side of the differential lines in the trees. Additionally, the 8x1 trees can
be combined to form four (4) pairs of 16x1 trees, or two pairs of (2) 32x1 trees, or a single pair of 64x1
tree. All of the combinations of trees allow independent control of the + and - side of the tree for true
differential measurement across any path. This capability allows 64 channels of signals to be switch to
either a digital subsystem or they can be individually switched to analog test equipment. Because all of
these options can be accomplished through software control, this switch module provides maximum
Flexibility regardless of the switch tree selected.
All of the relays are coaxially shielded to provide superior performance. The isolation relays are dual
coaxially shielded reed relays with a common control coil (DPST). These isolation relays provide support
for high speed digital performance, 100 MHz minimum bandwidth (150 MHz typical). The switch trees
are coaxially shielded SPST for maximum analog versatility at >>80 MHz bandwidth. Each of the sixteen
8x1 trees connect to a switch array to allow for combinations as 8x1, 16x1, 32x1, or 64x1 to the output
connectors, J2 and J5. There are sixteen 8x1 outputs, eight 16x1 outputs, four 32x1 outputs, and two
64x1 outputs. They can be all use together or switched out to provide superior performance by isolating
signal paths to improve the transmission line.
With this flexible combination of utilizing the switch trees, up to 30 instruments can be connected to the
Model 3000-46, Flex-switch in addition to the 64 pairs of digital signals. Additionally, two external
references are provided as well as analog and chassis ground for measurements of the + or - side of the
inputs to be measured against the 4 references. Two additional reference inputs are provided on the
daughter board (J5) which are assign to the - side of the measurement trees.
In a typical application without the 3000-46, the system designer would be required to use several
modules and wire them together to get mix signal capability. This inter-module wiring carries with it the
inherent loss of bandwidth due to spliced wires and other wiring requirements associated with inter-
module wiring. The ASCOR 3000-46 Flex-switch offers the customer the ability to combine all of the
different modules within a single module with exceptional low noise and high bandwidth performance.
The connectors are Robinson Nugent type P50E series ribbon cable connector. This connector accepts
dual ribbon cables with 0.050" centers. This series of connector has a high density 0.050" pitch contacts
which accepts standard 0.050" pitch ribbon on each side of the connector. The signal pins are located
