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Need to measure 10 microvolt EMF noise

Hello, I do eeg research (brainwaves). Signals are on the order of

10 microvolts (millionths of a volt). I need a battery powered instrument to measure noise in my environment on the same order. The Vellemans, Flukes, Teks, and so on I've looked at only get down to .1 mV or 30 microvolts (Velleman 230). This won't do.

1 - does anybody know of a more sensitive, battery powered instrumcnt?

2 - could I build/buy some sort of battery powered amp or preamp for the noise I pick up with an antenna? (was thinking about a 9v guitar preamp)

Thanks in advance for any help....

Jim

Reply to
kroger
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Almost any operational amplifier will do the job. And you can add simple filtering: capacitive coupling to the feed-forward resistor for the low end, and a shunt capacitor across the feedback resistor for the high end. I did that with a uA709 ages ago for a bio-feedback "machine" that fit ina pocket and ran from a 9V battery.

Reply to
Robert Baer

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