22 Jul
2006
22 Jul
'06
2:25 p.m.
no grounded track immediately available, so I'm
running the leads across the two channel N outputs.
also tried to chassis/earth ground, didn't make a difference . . .
That doesn't make much sense. The scope is across the PSU Channel 4 (-5V) outputs
(labeled + and -, I'm pretty sure they are GND and -5V in that order)
22 Jul
22 Jul
3:33 p.m.
New subject: Capacitor problems
On 7/22/2006 at 4:25 PM Scott Quinn wrote:
That doesn't make much sense. The scope is across
the PSU Channel 4 (-5V)
outputs (labeled + and -, I'm pretty sure they are GND and -5V in that
order)
I'm just thinking that your high-frequency noise is leaking in via some
non-obvious path. What happens if you leave your scope ground connected
where it is, but terminate the probe in a, say, 10K resistor to ground
(i.e. taken off the PSU supply rail)? I'm wondering if the noise is
really on the DC line and not just being picked up via a ground loop.
Cheers,
Chuck
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