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16517-82106

更新时间: 2024-10-29 00:54:47
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是德科技 - KEYSIGHT /
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77页 6162K
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Probing Solutions for Logic Analyzers

16517-82106 数据手册

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04 | Keysight | Probing Solutions for Logic Analyzers - Data Sheet  
Reliable Connections Ensure Accuracy  
Signal frequency content drives probing solutions  
– Impedance  
High input impedance ensures  
minimum intrusion on your circuit.  
Although many probes might be  
acceptable for lower frequencies,  
capacitive loading becomes  
significant at higher frequencies. The  
Keysight probing products perform  
over a wide frequency spectrum.  
Faster clock rates demand tighter timing tolerances, such as setup and hold  
specifications. Systems with faster clock rates usually have shorter rise and fall times.  
Signals with shorter transition times have more high frequency content and are more  
susceptible to high frequency analog problems such as cross talk, reflections, ground  
bounce, noise and emissions. Susceptibility of a system to analog problems relates to  
the transition times of the signals, not the clock rate. A system with slow transition times  
cannot have high clock rates. However, it is possible for a system with slower clock rates  
to have signals with very fast transition times.  
– Ruggedness  
General-purpose probing solutions provide the analog bandwidth required to run  
each logic analyzer module at its maximum clock rate. The high input impedance of  
these probes, especially at high frequencies, presents a minimal load to most systems.  
Systems that are operating with little margin should be designed with consideration for  
both the system components and the input impedance of the probing solution being  
used during debug. Input impedance specifications or equivalent load diagrams can be  
found for each of the probing solutions described in this document.  
Probes with quality mechanical  
design provide solid electrical  
connections. Intermittent open  
circuits would only add one more  
variable to your debugging equation.  
Keysight probes are mechanically  
designed to relieve strain and ensure  
rugged, reliable connection.  
– Immunity to Noise  
Electromagnetic noise can corrupt  
data captured by the logic analyzer.  
Keysight probing solutions are  
designed for a high immunity to  
transient noise.  
Which Logic Analyzer?  
For logic analyzers with 160-pin front panel connector, use probes identified in  
this document as “Direct-connect probes.”  
For logic analyzers with cables that use a 3M-style connector with two rows of  
20 pins on 0.1-inch centers, as illustrated in Figure 1.1, use probes identified in  
this document as “for analyzers with 40-pin pod connectors.”  
– Performance  
Keysight logic analyzers have  
front-end circuitry that supports the  
state and timing specifications of  
the analyzer. This circuitry, together  
with the Keysight probing solutions  
described in this document, will  
accurately capture the target signals  
at the specified clock rates.  
For logic analyzers with cables that use a 90-pin, high-density connector as  
illustrated in Figure 1.2, use probes identified in this document as “for analyzers  
with 90-pin pod connectors.”  
90-pin pod connector (pages 10 to 36)  
16950B, 16951B  
40-pin pod connector (pages 47 to 70)  
16911A  
U4164A, U4154A/B, and 16962A  
16910A  
16800 Series benchtop analyzers  
Other considerations  
Physical connection compatibility  
between various Keysight probes may  
allow you to mix and match a variety  
of probes and accessories. However, a  
probe accessory designed for slower  
clock speeds will not deliver high-speed  
target performance simply because it  
is used with a higher speed analyzer  
module. Also, the serial connection of  
multiple probe leads and/or accessories  
will degrade signal integrity.  
Direct connect probe/cables  
(pages 37 to 39)  
U4164A  
U4154A/B, 16850 Series  
Figure 1.1. 40-pin pod connector  
Figure 1.2. 90-pin pod connector  

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