Yes, of course, I can even tune the frequency by hand, with a wheel. Using
the cathode display there is no problem to make a complete sweep in 1 sec.
Remember that if there is an error with the compression, it's the same erro=
r
every time. I can still compare one measurment with another. And besides,
doing measurment on a parabol, outside, I set the sweep from 500 - 16.000
Hz. I'm only interested in high frequency response. It's there things happe=
n
when you deal with PZM's.
Using the printer, I always tune the frequency manually.
But I still need a definite answer from someone: Will the FFT analyser make
the same analysis, regardless of what the file looks like? If I use sine
wave sweep, - I was told - the FFT will behave differently depending on if
the sweep is linear or log.
I can't use an analysis instrument which change its measuring behavior
depending on what it is measuring! Perhaps I can't use the FFT and it seems
as if there is no other (budget) software to get.
Klas.
At 16:07 2003-07-05 -0700, you wrote:
>Klas, you wrote,
>
>>I don't know. In real life it seems to work as any compressor. Without it=
,
>>the frequency curve gets jumpier, exactly the same but more up and down. =
It
>>is a part of the complete analog machine, made in Germany sometimes aroun=
d
>>1980. Only the HP XY printer is separate.
>>
>>This machine has been very handly, as - when I work with a microphone
>>capsule - I can set the machine to make a sweep "loop", around and around=
,
>>and in the same time see the measured frequency response on a special
>>cathode-ray tube. It looks exactly as a log. frequency scale, with x=3Dfr=
eq
>>and a glowing dot following the Y=3Doutput from the microphone.
>
>That's what I envisioned from your original description. There's got
>to be an averaging time delay in that detection process, and I doubt
>that it can be accurate at the low end for fast one-second sweeps.
>Can you compare a one-second sweep with a slow one to see?
>
>-Dan
>
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