## PSN-L Email List Message

**
Subject: Re: New Lehman on line (almost)**

From: ChrisAtUpw@.......

Date: Wed, 2 Oct 2002 14:04:51 EDT

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

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