At that sensitivity, power-supply noise becomes significant. While a really
good quality lab supply can meet the requirements, you can do a lot worse
than to use a pair of 9v batteries. There's NO noise except what your
wiring picks up from the environment.
Norm
> -----Original Message-----
> From: Tomasz Motylewski [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, October 07, 1999 5:26 PM
> To: ahgu
> Cc: RtLinuX (rtl)
> Subject: Re: [OFF TOPIC] [rtl] how to amplify the signal from the
> detector?
>
> On Thu, 7 Oct 1999, ahgu wrote:
>
> > Wonder if anyone encountered the signal amplification problem. My
> detector
> > give out slow-varying DC signal in couple mV range. My A/D board reads
> 0-5V
> > and I need all the 16bit resolution. Where would I get a DC amplifier to
>
> Look at the list at http://www.xs4all.nl/~ganswijk/chipdir/f/amp.htm
> and choose some high precision low noise stable instrumentation amplifier.
>
> I have been using OP07, but there are probably better ones.
> See http://www.analog.com/pdf/op07.pdf
>
> Be aware that 16 bits at 5 mV means 76 nV precision. So your amplifier
> should
> be attached directly to the detector, everything well shielded, stable
> (good
> resistors, possibly temperature stabilised, some RC filter to reduce the
> higher frequency noise). If signal changes slowly, avaraging lots of
> samples
> will reduce noise significantly. In my experience, getting noise below 0.1
> mV
> might be very tricky.
>
> Best regards,
> --
> Tomek
>
> --- [rtl] ---
> To unsubscribe:
> echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
> echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
> ----
> For more information on Real-Time Linux see:
> http://www.rtlinux.org/~rtlinux/
--- [rtl] ---
To unsubscribe:
echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
----
For more information on Real-Time Linux see:
http://www.rtlinux.org/~rtlinux/
