5968-4632E Datasheet, PDF (70/77 Pages) Keysight Technologies – Probing Solutions for Logic Analyzers

70 | Keysight | Probing Solutions for Logic Analyzers - Data Sheet
Probing Solutions for 40-pin Logic Analyzers
Custom Probing
Low density, moderate performance
solutions shown in the “High-Density,
High-Performance” (page 62) section
of this document can be used in
place of the solutions described here.
Keysight recommends standard 0.1 inch
center connectors for normal density
applications if the loading/speed is not
a significant issue. Many of these items
are available from 3M or Keysight (see
Table 8). See the “Related Information”
section at the end of this document for
3M address information.
Table 8. Twenty-pin connectors for fixed configuration probing.
(Requires isolation adapter)
Keysight part number
1251-8106
1251-8473
3M part number
2520-6002
2520-5002
Connector description
20-pin, low-profile (straight)
20-pin, low-profile (right-angle)
Direct connection through
isolation adapter
Isolation adapters (Keysight part number
Logic analyzer pod cable
01650-63203) that connect to the end of
the probe cable are designed to perform
two functions. The first is to reduce the
number of pins required for the header
on the target board from 40 pins to 20
pins. This process reduces the board area
dedicated to the probing connection.
The second function is to provide the
Isolation adapter
(Keysight 01650-63203)
proper RC networks in a very convenient
package. Figure 9.36 illustrates how the
isolation adapter physically connects to
the target system and the equivalent load
of the isolation adapter connected to a
Keysight logic analyzer. Figures 9.37 and
20-pin connector
(Keysight 1251-8106)
9.38 show the pinout diagrams for the
probe cable and the isolation a^Isd^oa^lap^tit^oeⁿr,^{adapter RC network}
Equivalent load
respectively. There are two 20-pin
k
connectors, along with their Keysight and
Isolation adapter RC network
3M part numbers, listed in Table 8.
k
100 k
Equivalent load
100 k
1. The Keysight 01650-63203 saves space by
using a common ground (see Figure 4.5). This
will impact signal fidelity, especially faster
transition times (< 4 to 5 ns).
Figure 9.36. Isolation adapter (01650-63203) and equivalent load.