Specifications

Here is a possible Agilent
34980A configuration with
discussion points:
• 34980A Switch/
Measure Unit
• (1) 34945A Switch/
Attenuator Driver w/cable
• (3) 34945EXT with RJ-45
extender cables
• (3) Y1154A Distribution
Boards
• (3) Y1155A Distribution
Boards
• (3) Y1153A Distribution
Boards
• (5) Y1158A Cable Kits
for 87222E switches and
84905M attenuators
• Optional (6) Y1159A
Cable Kits for LEDs
If using the L4445A
Switch/Attenuator, simply
replace 34980A, 34945A, and
one of the 34945EXT’s above
with a single L4445A. (It comes
with a single 34945EXT).
Using Tables 1 and 2, the Agilent
87222E requires the Y1154A
Distribution Board. The Agilent
33314D are not supported with
connectors so they require the
Y1155A Distribution Board. The
Agilent 84905M requires the
Y1153A Distribution Board.
Since each test box already
has a 24 V power supply, that
supply will be used to power
the 34945EXT modules. The
34945A/L4445A will be con-
nected directly to the first
34945EXT with the supply
9-pin cable. The remaining
34945EXT’s are daisy chained
from the first 34945EXT using
the supplied RJ-45 cables.
If the 24 V power supplies had
not been available in the test
boxes, the solution could have
been to provide three 34945A/
L4445A modules where each
would be connected to a single
34945EXT. In that case, each
34945EXT would be powered
directly by the 34945A/L4445A
module. That solution is only
possible when all the switches
and/or attenuators use
24 V coils.
Additional observations on
Examples #1 and #2
configurations:
• Each 34980A has room
to expand. You can expand
microwave switch control
with additional 34945EXTs.
Plus there are still 7 slots in
the 34980A mainframe for
expansion of other modules
such as Digital IO, Analog
Output, Switching, etc.
• The 34980A has standard
LAN, USB, and GPIB for
easy connection to a PC.
Plus it has a graphical Web
interface for controlling the
switches over a LAN. The
L4445A has optional GPIB,
if necessary.
• Example #2 has additional
capacity to drive six N181x
switches (Y1154A), another
attenuator (Y1153A), and six
coils not used on the Y1155A.
The 34980EXT is actually
designed with mounting holes
for locating within test fixtures,
as illustrated below. This gets
the switches right next to the
DUT and improves signal
integrity by permitting the
use of semi-rigid coax.
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