Hi to all users of Dataq serial devices,

  I have developed a package of applications that are written in Visual Basic 
6.0 specifically for amateur seismography.  They permit gap-free data 
logging, heliplot display, filtering, editing, and conversion of WDQ format 
files to PSN Type 4.

  For data logging, you can have your choice of multi-channel output files, 
or separate files for each enabled channel.  Start-up can be manual, 
triggered, or scheduled.  Event marks are made on downward transitions of 
digital input D0.  In triggered start mode, recording starts on the first 
downward transition of D0.  Sequential files of any sample size can be made 
without loss of any samples.  A real-time spectrum analyzer is built into one 
version of the data logger.

  For editing, you can splice single channel files together, or combine 
separate channel files into one multi-channel file.  You can correct the 
recorded start time, and trim the recorded sample period to its true value.  
You can convert files to PSN format, using header templates already set up 
with your sensor properties and timing information.

  For display and filtering the DrumPlot and ShortPlot programs are included. 
 Filtered versions of raw data files can be created and saved.  For 
Lehman-type sensors, a filter is provided that mathematically extends the 
period of the sensor up to five times its natural period.  (Since my sensor 
is only 11 seconds natural period, I would be lost without this filter.)  To 
see the entire plotting surface, your screen area must be at least 1024 x 768 
pixels.

  This package will eventually be posted on John Lahr's web site,

 http://www.jjlahr.com/science/psn as "SeismicForDataq.zip".

  It will augment and update other applications already on the site. If you 
should want an advance copy, please contact me by email.

Regards,

Bob McClure

Hi to all users of Dataq serial devices,



  I have developed a package of applications that are written in Visual=
 Basic 6.0 specifically for amateur seismography.  They permit gap-free=
 data logging, heliplot display, filtering, editing, and conversion of WDQ f=
ormat files to PSN Type 4.



  For data logging, you can have your choice of multi-channel output fi=
les, or separate files for each enabled channel.  Start-up can be manua=
l, triggered, or scheduled.  Event marks are made on downward transitio=
ns of digital input D0.  In triggered start mode, recording starts on t=
he first downward transition of D0.  Sequential files of any sample siz=
e can be made without loss of any samples.  A real-time spectrum analyz=
er is built into one version of the data logger.



  For editing, you can splice single channel files together, or combine=
 separate channel files into one multi-channel file.  You can correct t=
he recorded start time, and trim the recorded sample period to its true valu=
e.  You can convert files to PSN format, using header templates already=
 set up with your sensor properties and timing information.



  For display and filtering the DrumPlot and ShortPlot programs are inc=
luded.  Filtered versions of raw data files can be created and saved.&n=
bsp; For Lehman-type sensors, a filter is provided that mathematically exten=
ds the period of the sensor up to five times its natural period.  (Sinc=
e my sensor is only 11 seconds natural period, I would be lost without this=20=
filter.)  To see the entire plotting surface, your screen area must be=20=
at least 1024 x 768 pixels.



  This package will eventually be posted on John Lahr's web site,



 http://www.jjlahr.com/science/psn as "SeismicForDataq.zip".



  It will augment and update other applications already on the site. If=
 you should want an advance copy, please contact me by email.



Regards,



Bob McClure