Gerald,
I need to review what I did because according to the Zoom H2 forum
http://www.2090.org/zoom/bbs/viewtopic.php?t=3D9542
I should be getting about -115db which is more in line with Robs web
page figures. Maybe I should not set the recording gain above 100?
I'll get back when I figure out my problem if there is one.
Ted
--- In G W <> wrote:
>
> http://www.uwm.edu/~type/audio-reports/HiMD/index.htm
>
>
> ----- Original Message ----
> From: Ted Coffey <>
> To:
> Sent: Monday, October 8, 2007 7:11:11 PM
> Subject: Re: [Nature Recordists] Zoom H2 Self-Noise Test
>
> Gerald,
> I failed to note that the recording level was set yo 127 the max
> level. I have not tried this test at other levels but maybe that would
> be informative. I did vary the resistor value over a range of 10 ohms
> to 10,000 ohms and did not notice any significance. I think I'll add
> that recording level info to the data file.
> Can you give me a link to Rob's web page of the data you referenced?
> I'll see if I can correlate.
> The data I collected would represent a level of noise around 60 db
> below the maximum recording level just below the clipping level.
> There is variation based on frequency. The low frequencies are worst
> of all reaching -50db but that is in a region that is not a problem.
> The values in the 2000 to 6000 hz range are most important to me.
>
> Ted
>
> --- In naturerecordists@ yahoogroups. com, G W <gwapuffin@ ..> wrote:
> >
> > Ted,
> > I struggle with interpreting test numbers so perhaps your test is
> self explanatory, please help me get a handle on your test.
> > I looked at Rob's web page where he describes the self-noise of the
> HIMD and find it difficult to relate that info to yours. If the HIMD
> numbers in Rob's information were represented as -db, what would that
> be? Or the point of my question is what is the difference between the
> two units? Would the gain setting on the H-2 make a difference with
> the external mic shorted with the resister or does that produce max
gain?
> > Gerald White Muscatine, IA
> > ----- Original Message ----
> > From: Ted Coffey <twcoffey@ .>
> > To: naturerecordists@ yahoogroups. com
> > Sent: Monday, October 8, 2007 2:00:41 PM
> > Subject: [Nature Recordists] Zoom H2 Self-Noise Test
> >
> > I just uploaded 2 files to the members file folder:
> > 1. Zoom H2 Self-Noise.Wav
> > 2. Self-Noise Test Data.txt
> >
> > Conditions for the test are listed in the txt file with the data
values.
> > I used Audacity to analyze the spectrum.
> > Recorder serial number 5926
> >
> > Ted
> >
> >
> >
> >
> >
> >
> >
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