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HP Logic Analyzer Inverse Assemblers

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deanclaxton:
So yeah - it looks like I need the E5378A probe set which mates to a Samtec ASP-65067-01 connector. Probing solutions datasheet here : https://www.keysight.com/gb/en/assets/7018-06707/data-sheets/5968-4632.pdf

deanclaxton:
Ok so I've designed a 65C02 adapter for the Agilent E5378A probe set (Samtec).

I noted however that on these 90 pin analyzers, there are differential clock signals on each pod - CLKp and CLKn.

If I'm connecting to a single ended clock source, do I just use CLKp? And leave CLKn unconnected, or connect it to ground? On the 40 pin pods there was just the one CLK signal.

I should add that I havent actually received my analyzer yet, else I'd have tested this!


EDIT : Found this on page 53 of this manual https://www.artisantg.com/info/Agilent_E5378A_Manual.pdf :

Clock input
The clock input to the E5378A probe is differential. If you supply a differential clock, you should select the "differential" option in the clock threshold user interface.

If your system uses a single-ended clock signal, the CLKn input should be either grounded or connected to a dc power supply.

You may:

• Ground the CLKn input and adjust the clock threshold from the user interface to between -3V dc and +5V dc.
Or
• Supply a threshold reference voltage between -3V dc and +5V dc to the CLKn input. In this case, the clock threshold in the user interface should be set to zero.

If your circuit uses a resistive divider to provide a threshold reference, be sure to consider the equivalent circuit consisting of the 20k resistor connected to +0.75V
as shown on page 34 and 35.

The threshold for the clock input has a separate adjustment in the user interface, independent of the data inputs.

MarkL:
Nice adapter!

You might need some mechanical support for the connector and/or analyzer cable.  The Samtec has a good friction fit, but it may not sufficiently resist the sideways force from the weight of the cable.  HPAK sold a "shroud" to help with this problem.

BTW, the analyzer side of the 90-pin cable uses the same 100-pin Samtec connector, if you want to get an idea for the tightness of the fit.

deanclaxton:
Ok cool - I will check that out. I do have the mounting holes on the board for the shroud, but no idea where I'd get one. Perhaps eBay? I'll have a look.

MarkL:
Keysight has them for sale on their Find-A-Part page for US$8.94, plus no doubt additional fees and shipping:

  https://www.keysight.com/us/en/ecom/parts/parts-number.html/16760-02302

Rather pricey for a piece of sheet metal, but not surprising for them.  Plus, they've been increasingly difficult to deal with if you're not a business.

I would try to buy it from them, and if unsuccessful, maybe a Keysight reseller will order it for you.  Or, if you're good with mechanical design, a 3-D printed shroud could be done.


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