dfulton at kopb2.opb.org
Wed Mar 19 18:39:00 CET 1997
On Wed, 19 Mar 1997 gstopp at fibermux.com wrote:
> It really does sound like a power supply issue, at least so far...
> does that HP power supply have a current limit knob? If so, crank it
> to max current. There's no problem in doing that, if all connections
> are OK. The ASM will only take what it needs.
No current adjustment. And the ASM draws the specified amount of current
(or close to it) from both supplies.
> Otherwise, make sure that you're using fairly big wire for power.
> Skinny wire carrying current causes voltage drops. Any impedence in
> the power lines other than 0.0 ohms may cause circuit interactions.
> I've used 24 gauge solid (LAN UTP cable), but it would be better to
> use 14-18 gauge if it's handy.
I just used small hook up wire until I was done with the bench testing, I
will attempt to swap them out with some larger wire.
> Also - you did include all of the bypass caps, right? They should be
> around 0.1uF each, or 0.22, or something larger than tiny and smaller
> than huge.
Yes,& this might be where I screwed myself. I used cheap .1uf 50V ceramic
caps for bypass purposes only. I think this is unlikely but possible.
I take it to mean that any amount of crosstalk between modules is not the
norm & all could be removed?
I bussed the wiring between the PCB & Panel(so that it looks neat). It
is possible that I am getting small amounts of crosstalk just within the
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