5968-4632E Datasheet, PDF (63/77 Pages) Keysight Technologies – Probing Solutions for Logic Analyzers

63 | Keysight | Probing Solutions for Logic Analyzers - Data Sheet
Probing Solutions for 40-pin Logic Analyzers
Mictor and Samtec Probing (Continued)
Keysight Technologies E5346A, E5339A, and E5385A probes
The E5346A, E5339A, and E5385A probes include the required isolation networks for
the logic analyzer right at the probe tip, close to the target. The E5346A and E5385A are
designed to acquire signals with peak-to-peak amplitude as low as 500 mV. The E5339A
is designed to acquire signals as small as 250 mV peak-to-peak. Figure 9.24 shows
the equivalent load for the E5339A, and Figure 9.25 shows the equivalent load for the
E5346A. Figure 9.26 shows the equivalent load for the E5385A.
To use the E5346A, E5339A, or E5385A at high clock speeds, the following design
guidelines should be observed:
– Calculate the electrical length of the probe hookup stub.
– For PC board material with E_r=4.9, use a propagation delay of 160 ps/inch.
– Check that the propagation delay of the probe hookup stub is less than 20% of the
bus signal rise time (T_r). If it is, the E5346A, E5339A, or E5385A can be used for
connection.
For example, if E_r=4.9, a 2.5 inch probe hookup stub generates a propagation delay of
400 ps. If T_r is > 2 ns, the E5346A, E5339A, or E5385A is a viable probing choice.
The E5346A and E5339A use the AMP Mictor 38-pin connector. The E5385A uses a
100-pin connector manufactured by Samtec. Keysight recommends the E5394A or
E5385A for new applications, due to the reduced input capacitive loading and improved
isolation between adjacent channels.
Equivalent load
Equivalent load
Equivalent load
Figure 9.24. E5339A Low Voltage Mictor probe
input equivalent load.
Figure 9.25. E5346A Mictor probe input
equivalent load.
1.5
k
Figure 9.26. E5385A Samtec probe input
equivalent load
For additional information on designing connectors into a target system, refer to the following documents:
Keysight E5346A/E5351A Probe/Adapter Installation note E5346-92016 http://literature.cdn.keysight.com/litweb/pdf/E5346-92016.pdf
Cable
Keysight E5339A Low Voltage Probe
Installation note E5339-92002 http://literature.cdn.keysight.com/litweb/pdf/E5339-92002.pdf
Keysight E5385A Probe
Installation note E5385-92001 http://literature.cdn.keysight.com/litweb/pdf/E5385-92001.pdf