From: Andreas Robinson (sleeper75se_at_yahoo.se)
Date: 2002-04-13 23:46:59
Hello people,
time for a little progress report:
I am the cat who just found the cream.
After a lot of little nuisances I finally got my
12-bit data acquisition board up and running, without
letting the smoke out of any of the parts! (Ok, that's
an EE in-joke.)
I have attached two screenshots from my oscilloscope
app (written using MFC, mohaha). One shows the noise
present in a full-scale square wave. It is merely 1
LSB, but I believe it is from the function generator
since it disappears when I lower the amplitude.
The second shows a full scale sine wave on channel 0.
The other three channels are floating, so there is
quite a bit of interference from channel 0 on those. I
hope that it will go away if I connect them to ground
or another low-impedance source - haven't had the time
to do that yet as I am doing this at home and not in
the lab.
This does not mean that the device is ready, but it is
much closer to completion anyway.
What's next: I will build and test the rs232
optocoupler (a new solution using a MAX1488E), redraw
the layout a bit and then create a neat little package
for you to download. This won't include the analog
section, but for testing and code development you just
need an instrumentation amplifier, and a handful of
parts. Or you could build Joergs amplifier board
(assuming it can be converted to +/-5 volts?). How are
things going with that Joerg?!
Regards,
Andreas
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:43 BST
