The Amaseis processing works the same as Dataq's. It samples at 240
samples per second and averages to data down to the user's acquisition rate.

Bob

On Tue, Jul 24, 2012 at 10:02 AM, Randall Pratt wrote:

>  Hi All,****
>
> ** **
>
> I am looking at my noise and aliasing and it brings up a question on
> sample rates.****
>
> ** **
>
> Using a Dataq 154 and their collection software the data rate is set as a
> reduction from the basic 240 sps either by averaging such as using 40
> samples to get 6 sps, by taking the max value of the 40 samples or by one
> of several other options .  My understanding is that the averaging method
> provides some reduction of noise and aliasing and would be the better
> option from that respect and also because the sample would be taken at a
> set time period versus a max value occurring anywhere during the 40 sample
> period.  Also by sampling at 240 and using a factor of 240 to average and
> reduce the rate will result in 60 hz aliasing into the nyquist bin with
> little effect on frequencies of interest.****
>
> ** **
>
> The question then is this.  When I log using AmaSeis and the DI-154 at 6
> sps do I get an average, a max of a group of samples or a specific Amaseis
> controlled sample rate of single 6 sps samples?  ****
>
> ** **
>
> Randy****
>
> ** **
>
=C2=A0 The Amaseis processing=
 works the same as Dataq's. It samples at 240 samples per second and av=
erages to data down to the user's acquisition rate.
<=
font>


Bob<=
br>
On Tue, Jul 24, 2012 at 10:=
02 AM, Randall Pratt <rpratt@.............> wrote:















Hi All,

=C2=A0

I am looking at my noise and aliasing and it brings up =
a
question on sample rates.

=C2=A0

Using a Dataq 154 and their collection software the dat=
a
rate is set as a reduction from the basic 240 sps either by averaging such =
as using
40 samples to get 6 sps, by taking the max value of the 40 samples or by on=
e of
several other options .=C2=A0 My understanding is that the averaging method
provides some reduction of noise and aliasing and would be the better optio=
n
from that respect and also because the sample would be taken at a set time
period versus a max value occurring anywhere during the 40 sample period.=
=C2=A0
Also by sampling at 240 and using a factor of 240 to average and reduce the
rate will result in 60 hz aliasing into the nyquist bin with little effect =
on
frequencies of interest.

=C2=A0

The question then is this.=C2=A0 When I log using AmaSe=
is and
the DI-154 at 6 sps do I get an average, a max of a group of samples or a
specific Amaseis controlled sample rate of single 6 sps samples?=C2=A0 <=
/u>


=C2=A0

Randy

=C2=A0