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Double-Ended Sockets allow construction
of fixtures with shorter signal path lengths
compared to conventional wire-wrapped
designs. The shorter path length allows
for improved signal integrity from the
tester circuits to the Unit Under Test
(UUT). Fixtures built in this manner are
referred to as "wireless," type test fixtures.
The impedance characteristics are improved,
allowing greater bandwidths for analog
test signals and higher vector rates for
digital testing. For three probes on .100
inch centers (signal between two grounds),
excellent performance to more than 2 Ghz
was achieved. For more information on
high frequency testing, please request
Frequency Response for Double-Ended Socket
and Probe Configurations.
A Double-Ended Socket consists of a conventional
socket with a non-replaceable interface
probe contact as its termination. The
interface probe typically contacts a flat
plated surface, which is part of a dedicated
PCB that interfaces with the interface
probes on the specified tester. Basic
tip styles such as spherical and chisel,
are offered on the bottom side probe due
to the flat contact surface. Because the
bottom probe is used in non-cycling applications,
it will last the life of the socket. In
the event that the socket is damaged or
worn, the complete Double-Ended assembly
is replaced.
The top of the socket accepts standard
probes from QA Technology 050-16, 050-PT25,
075-25, and 100-25 series and is replaceable,
as routine maintenance requires.
Double-Ended sockets have bottom side
probes with a total stroke of .150 (3.81).
This allows a set height variation between
.047 (1.19) and .137 (3.48) or a total
of .090 (2.29). This design allows a much
larger variation in set height to accommodate
the majority of component heights found
on loaded boards.
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| Spring Force
chart for .150 (3.81)-stroke interface
probes |
Interface
Probe |
Suggested Mixed-Mounting
fixture for Double-Ended Sockets
Note differences in Socket set Heights
(marked with *)
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