From: sleeper75se (sleeper75se_at_yahoo.se)
Date: 2002-04-23 18:21:15
--- In buildcheapeeg_at_yahoogroups.com, "Rob Legg" <legg_at_magma.ca> wrote:
> Joerg,
>
> Your test set-up should attempt to duplicate end-use,
> particularly with the power to the DUT. The measurement
> should not be affected by 250VAC of common mode noise,
> if correctly configured.
>
> I inquired earlier, why the sampling frequency
> wasn't chosen to reject 50/60hz interference,
> and was reassured that this hadn't been a problem
> and wasn't expected to be a problem. Using a sampling
Hello Rob,
you address Joerg, but I assume it is me (Andreas) that you are
talking to? I'm the one who did these tests.
Anyway, you bring up a valid point - it could be more realistic. As
long as there are pieces missing, we should take some results with a
pinch of salt. This was more of a module-test rather than a system-
test, so there was neither any isolation, nor any DRL in use.
Joerg has done tests with his amplifier design, with electrodes on
his head and stepping on a 230V cable.
Without the DRL there was lots of interference. With the DRL there
was none (or very little). As long as I cannot reproduce his results,
my design or my test setup needs modification.
Take a look at this post:
http://groups.yahoo.com/group/buildcheapeeg/message/2182
I hope I sound convincing. :-) If not, feel free to ask more
questions ...
Regards,
Andreas
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:43 BST