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white noise generator for low frequency

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StB71

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Hello all

I'm looking for a white noise generator for a 1Hz voltage measurement. Is there an easy way to build such a noise generator? The offset and the noise level should be adjustable.

Sorry for this question but I'm not an expert in electronics.

Thanks for your help
 

It is very hard to define a white noise for one particular frequency. White noise is a rather wide-band signal.
 

The question isn't well elaborated. You should specify a frequency range for that constant noise density is intended. Usual analog noise sources like zener diodes show often 1/f spectral density below 10 Hz, some equalization may be required.
 

"White" implies a specific equal energy per unit frequency
frequency profile of the noise.

"Pink" is equal energy per octave (or decade), logarithmic.

You can see sub-Hz activity in RTN (random telegraph noise)
and many semiconductor devices will produce white noise
(in current mode) which is transformed to pink with any
significant shunt C (corner frequency depends on the
source element Rout and Cshunt).

Now how a noise source enables a voltage measurement,
I couldn't say. Nor whether you really want white, pink
or plaid. Are you tasked with measuring the AC voltage
in a band surrounding 1Hz (+/- ?) To measure the voltage
at 1 second intervals?
 

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