1
General Information
1-1
1.1
Introduction
This section contains general information about the Model
708A Switching System. The Model 708A is designed as a
programmable switch for connecting signal paths in a matrix
topology. It is for applications requiring a small-scale matrix
(up to 96 crosspoints per mainframe and 480 crosspoints per
master/slave configuration). Plug-in cards are available for
general and special purpose switching applications.
1.2
Features
Key features of the Model 708A Switching System are:
• The switching system accepts one 7X7X switching card
(front or rear panel installation).
• Digital I/O contained in the switching system (sixteen
inputs and outputs with internal pull-up resistors).
• IEEE-488 bus or interactive programming.
• Storage of 100 sets of relay setups, which can be up-
loaded or downloaded through the IEEE-488 interface.
• An active front panel LED display shows the present re-
lay status, a stored setup, or an editing scratchpad.
• High-speed triggering of stored setups.
• Make/break and break/make switching programmable
matrix by rows. Operation is transparent and indepen-
dent of the relay setup.
• Maximum matrix size of 8 rows by 60 columns (480
crosspoints on one IEEE-488 address with five units
connected in a master/slave configuration).
• Sealed construction, low heat producing design elimi-
nates vent holes, which is suitable for cleanrooms.
• An optional light pen is available for interactive control
of relays and editing stored relay setups.
1.3
Warranty information
Warranty information is located at the front of this manual.
Should your Model 708A require warranty service, contact
your Keithley representative or an authorized repair facility
in your area for further information.
1.4
Manual addenda
Any improvements or changes concerning the switching sys-
tem or manual will be explained in an addendum. Be sure to
note these changes and incorporate them into the manual be-
fore using or servicing the unit.
1.5
Safety symbols and terms
The following symbols and terms may be found on an instru-
ment or used in this manual.
The
symbol on an instrument indicates that the user
should refer to the operating instructions located in the in-
struction manual.
The
symbol on an instrument shows that high voltage
may be present on the terminal(s). Use standard safety pre-
cautions to avoid personal contact with these voltages.
The
WARNING
heading used in this manual explains dan-
gers that might result in personal injury or death. Always
read the associated information very carefully before per-
forming the indicated procedure.
The
CAUTION
heading used in this manual explains haz-
ards that could damage the instrument. Such damage may in-
validate the warranty.
!
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