Hi Jim et al
      I like the auto-variable gain idea. I have in the past run a 12 =
bit A/D with a variable gain (1- 1024). The triggering routine and how =
you store the data gets a little complicated, but it works pretty well. =
There can be a slight zero shift when the computer changes gains. I used =
a Maxim 16 position switch with a resistor ladder. It's best run running =
at a reasonable gain and if an event occurs, then the gain is reduced by =
multiples of two to stay on scale. One can store the gain setting for =
each data point at the lower bit area. 16 bit with variable gain is what =
I'm shooting for. =20
Regards
Barry









Hi Jim et al
      I like =
the=20
auto-variable gain idea. I have in the past run a 12 bit A/D with a =
variable=20
gain (1- 1024). The triggering routine and how you store the data gets a =
little=20
complicated, but it works pretty well. There can be a slight zero shift =
when the=20
computer changes gains. I used a Maxim 16 position switch with a =
resistor=20
ladder. It's best run running at a reasonable gain and if an event =
occurs, then=20
the gain is reduced by multiples of two to stay on scale. One can =
store the=20
gain setting for each data point at the lower bit area. 16 bit with =

variable gain is what I'm shooting for.  
Regards
Barry