Geoff,

It looks like you are on the right track.  The source code is in fortran
and I can send it along if you want to play with it.

60 db is a lot of gain but not too much for a 1 Hz geophone

how did you get to a recording media gain of 1023?

Angel




On Sat, 2010-04-10 at 09:27 -0700, Geoffrey wrote:
> Hello sismos/Angel;
> 
> here is first results which i need to play around with.
> It (response) looks about as I thought it would except this is displacement
> instead of velocity.
> 
> Thanks very much for the download and information.
> 
> This program is written like I used to write
> in the old QBASIC interpreter which came free in MSDOS.
> 
> The FTP server did not want me to log on at first
> but it did finally let me do so.
> 
> Do I understand displacement gain at 1Hz of 75 million ?
> 
> Best regards,
> geoff
> 
> 
> 
> ********************************* BELOW **********************
>   SENSOR TYPE: SEISMOMETER       RESPONSE: DISPLACEMENT   
>   SEISMOMETER PERIOD=   1.000000    
>   GENERATOR CONSTANT=   117.0000    
>   DAMPING RATIO     =  0.7071000    
>   AMPLIFIER GAIN(DB)=   60.00000    
>   RECORDING GAIN=       1023.000    
>   FILTER CONSTANTS
>   F=  2.00   POLES=  6
>   F=  0.14   POLES=  1
>   F=  0.03   POLES= -2
>   GAIN AT 1 HZ=        7.5269264E+07
>  

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