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Re: Question about cables and probes for hp 16715a.


 

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On 2024-08-29 06:05, Don't Know via groups.io wrote:
Hi all. I have two 16715a cards, with cables, but without pods with wires to connect to hooks. I would like to make them myself, but I need more information about them. Specifically, I need to understand the pinout of the pod connector, and how they differ from each other.
A) What does "L clock / K clock / M clock / J clock" mean and the pod numbering, is there any difference in them, or are they just stickers for the symbol?
B) And, I wonder what kind of 40 pin pods existed for logic analyzers? Were they purely passive, or was the +5V line in the cables used to power the probes?
B) Also, do the wires themselves, going from the 40 pin connector to the hooks?, have the same resistance as the 16715-61601 cables? (thanks Keith)
if someone measures the cable resistance with a multimeter, it will help me a lot.
? - Photo 40 pin pod that I'm talking:
?
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If you have any information on this topic, please share it.
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A lot of the information you are looking for may be found in the manual "Logic Analyzer Probing Solutions" available from Keysight On the flying lead probe you have pictured, the individual wires from the connector to the plastic piece with the probe number on it is a coax and may be lossy coax however even it it is, it is only about 22cm long and would contribute little to the 90.1K I measured compared to the the resistance of the isolation network housed in that same little piece of plastic.? I suspect the last 3cm from the isolation network to the tip is just a straight wire.? In the manual there is a section concerning custom probing that includes cautions about lead length and grounding.??

When I first got an HP analyzer? I made up rough isolation networks based on the information from the above mentioned manual and used about 15cm long jumpers to connect to the signals I wanted to monitor, they worked but may have been problematic if I had tried to monitor any really fast signals. ?

Each of the 40 pin connectors has one signal line designated as a clock the letters assigned relate to the pod number for instance the pod 1 in your picture is clock "J", pod 2 has clock "K" and so on, this is how the software on you logic analysis system will refer to the clocks.? In a pinch the clock lines can usually be used as another probe line too.

Paul.?


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