Atec Agilent-346a - Manual (Page 13)

13
General-Purpose Probing
For All Agilent Logic Analyzers with 40-pin Pod Connectors
IC Clips
The surface-mount device IC clip
with twin hooks (part number
5090-4833, containing 20 IC clips)
is designed for fine surface-
mounted component leads. The
twin hook 0.5 mm IC clip (part
number 10467-68701, containing
four 0.5 mm IC clips), is very use-
ful for 0.5 mm pitch components.
See Figure 4.5.
The E2421A kit contains one
each: 8-pin, 14-pin, 16-pin, 20-pin,
24-pin, and 28-pin SOIC test clips.
See Figure 4.6.
The E2422A kit contains one
each: 20-pin, 28-pin, 44-pin,
52-pin, 66-pin, and 84-pin QUAD
IC test adapters. See Figure 4.6.
Grounding
There are three methods of
grounding the probe system.
First, the entire probe lead set
can be grounded through the
common ground. This requires
only one connection, but is not
recommended because it will
cause poor signal fidelity in
systems with fast transition
times. The recommended method
is to individually ground each
probe lead. This yields optimal
signal fidelity and is required for
signals with faster transition
times (< 4 - 5 ns).
For moderate rise times (greater
than 2 ns), it may be acceptable
to ground every other (or every
fourth) ground connection to
the target.
Figure 4.4. Connecting IC clips and ground leads to probes
Figure 4.5. SMD IC clip and 0.5 mm IC clip
Signal leads
SMT IC clip
RC network housing
Figure 4.6. Typical IC test clips available in E2421A SOIC kit (left) and
E2422A QUAD kit (right)
5090-4833 10467-68701
Probe ground leads