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10
Switch and Measurement
Connections
Most often, test systems must be
flexible enough to be easily moved
to a new location or modified for
different devices under test.
Having a removable wiring
terminal block or a pre-wired cable
is optimal in these situations. The
module’s terminal and/or cable
can simply be removed and
replaced with a different terminal
for the new test configuration. This
prevents the need to rewire the
same terminal each time for
different applications.
Fortunately, both the 34980A and
3499A/B/C provide the removable
terminals and pre-wired cables so
changing your test system wiring
from the 3499A/B/C to the 34980A
is fairly simple.
The 34980A offers the ability to
use either standard Dsub 50 and
Dsub 78 connectors/cables,
detachable terminal cards or mass
interconnect connections. The RF
and Microwave modules include
standard connectors such as SMA
and SMB. The 34980A cables
(Dsub50 and Dsub78) are low cost
and readily available from many
sources. The detachable screw
terminal blocks are easy to wire
and include built-in cable strain
relief. The screw terminals attach
to the switch modules with a
secure latching mechanism for
ease of use and improved
connection reliability. No tools
are required to easily connect and
disconnect the wired terminals.
The 3499 terminals are secured to
the module and housing by screws
at the end of the terminals and
require a screwdriver to remove
or replace.
For more complex test system
wiring, mass interconnect (one
location in a system where the
switch, instruments and DUT are
interconnected) is made easy by
using solutions provided by
connection experts. The standard
Dsub 50 and Dsub 78 connectors
make it faster and easier for Mass
Interconnect suppliers to provide a
test system wiring solution. The
easy to use connections facilitate
time and cost savings for test
systems using the 34980A.
The 34980A terminal wiring and
cables are different from that of
the 3499A/B/C. However, they
offer a better solution to test
system interface due to the use of
highly reliable standard
connectors and low cost cables.
Refer to Table 2 for the modules
that have optional terminal
blocks or the 34980A data sheet
for specific module wiring
connection details:
http://www.agilent.com/find/34980A.
The 3499A/B/C offers removable
screw terminal blocks for many of
the modules and also an option for
pre-wired DIN96 to quad D25, or
dual D50 cables. Some of the
modules such as the Optics,
Microwave and RF modules
include the SMA or BNC terminals
for application specific
connections. Refer to Table 2 for
modules that include terminals.
34980A Modules and Std DSub 50/78 connectors 3499A/B/C Modules and Terminals