RE: Fluke pod cables (related to 6502 pod)

Hello,

    I'm new to this group so I hope that this message gets through. I found
the same problem (pod fails/works with shield connected/unconnected) with a
pod cable on a z80 pod that I recently purchased from Art AS IS only the
internal short to the shield was on pin 2 (A12). Must be a degradation over
time in the insulation which was used inside the 40 pin DIP connector of the
pod cable. I fixed mine by bypassing pin 2 with a 40 pin socket adapter.
Hearing this, I now will expect that this can happen with all original pod
cables over time and will need to find (make) a suitable replacement. To
debug it I used a flat ribbon cable from an IDE cable and added a 40 pin IDC
connector. I put the ribbon cable back on the pod and am learning how to
use the 9010A - I don't think that the unshielded cable will hurt me in my
low-freq. application (repairing pacman boards). For other pods / higher
freq systems, I think the twisted pairs cabling will be needed and I won't
buy NOS Fluke replacement cables as a solution.

Best Regards,

Bill Karkula
  -----Original Message-----
  From: owner-techtoolslist@flippers.com
[mailto:owner-techtoolslist@flippers.com]On Behalf Of David Shoemaker
  Sent: Thursday, February 19, 2004 1:56 AM
  To: techtoolslist@flippers.com
  Subject: Fluke pod cables (related to 6502 pod)

  Working on a set of Cloak & Dagger boards I found that my one good set
just didn't reliably want to pass self test or run with the pod connected.

  Talking to Kev I started thinking maybe the pod was a touch slow or that
the standard flat ribbon cable was giving too much cross talk.

  I pulled a twisted pair pod cable off of a spare 8085 pod and set it up
for self test. Everything works fine UNLESS I actually connect the shield
ground connector on the cable to the pod ground screw. Did some pin checks
and it appears they connect the shield ground directly to pin 20 (GND) in
the UUT end of the cable. Reasonable.

  The reason the 6502 pod fails if I connect the shield is that on CPU pin
20 is AB11 and the CPU ground is on pin 21 for the 6502.

  Leaving the shield ground unconnected the C&D board comes up and passes
self test. So I do think there is cross talk going in the flat cable.

  Did anyone ever find a solid lead on replacement pod cables?

  Oh I also looked at a spare Z80 pod which has a nice juicy 18" or so
twisted pair pod cable. Its got shield ground connected to pin 29 and
something else around pin 25 that I haven't figured out yet as even with the
shield unconnected the pod won't pass self test.

  David

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Received on Thu Feb 19 06:28:51 2004