In a message dated 02/10/02, randallpratts@.......... writes:

> With the boom blocked I don't get a step function as in fig 4.5.1a but 
> rather an exponential decay.  I find that a bit confusing since I put a 
> steady battery voltage across the coil but I have attempted to determine 
> the curve and adjust subsequent readings by the correct factor over time.  
> I'm also not clear about para 9 where a0 is computed.  What does that 
> formula really mean?

Hi Randy,

       Looking at you Website, I note that you are using the PSN amplifier. 
This has a high pass filter in it which will give an exponential response to 
a step signal.
       If you can refer to the particular section, we may be able to help 
you. My para 9 has no a0 in it and doing a text search, there are several 
references to variables, but none with just a0.

       Regards,

       Chris Chapman
In a message dated 02/10/02, randallpratts@.......... writes:



With the boom blocked I don't get a step function as in fig 4.5.1a but rather an exponential decay.  I find that a bit confusing since I put a steady battery voltage across the coil but I have attempted to determine the curve and adjust subsequent readings by the correct factor over time.  I'm also not clear about para 9 where a0 is computed.  What does that formula really mean?




Hi Randy,



       Looking at you Website, I note that you are using the PSN amplifier. This has a high pass filter in it which will give an exponential response to a step signal.

       If you can refer to the particular section, we may be able to help you. My para 9 has no a0 in it and doing a text search, there are several references to variables, but none with just a0.



       Regards,



       Chris Chapman