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Discussion in 'Archived Threads 2001-2004' started by Rob Curtis, Jan 4, 2002.
Can anyone help me find it, or repost it please?
Perfect!!Thank you it's exactly what I was looking for.
Deleted by author.
What tone does Video Essentials use for it's calibration?
Warning: Newbie in this area.
Does this chart compensate for human hearing or is it used for some other reason?
It's used for correcting the deficiencies of the mic pickup used in the RS SPL meter at various parts of the audio spectrum.
is the provided scale for the digital or analog model or both?
As a non-precise manner of SPL measuring, the corrections will work for both models.
That is totally weird that the meter would have those deficiencies. But I guess we're not paying a huge amount for it.
I am assuming I have been using those correction factors correctly.
As an example, if my reading at 25 Hz is showing -5db on the meter scale, my level is actually zero since the meter is insenstive at that frequency by 5db.
Is this correct?
Ten - 4
BTW, ignore the calibration numbers for anything over 9KHz, there's a big fall-off in mic sensitivity there. (Then again, unless you're testing tweeters, it's not a big deal).
Can anybody answer Mal Ps question? What db adjustment do we need for the test tone on VE with the Rat Shack SPL meter?
Ted, the second post in this thread answered the question. If the meter reads what's in the first column, you must add the value in the second to get the actual reading.
Actually, I believe the test tones on VE (if they're like Avia) are low-frequency pink noise, random LF signal. It's my understanding that the RS meters read 2-3 dB low on such a signal, so you would add, say, 2.5dB to the raw RS reading to get the "true" level of the tones.
Jeff, I am aware of the second post, but I dont know what frequency the test tones are in VE. Jack just answered my question, though. Thanks!
I *know* that Avia is set up with the RS meter in mind. No calibration offset adjustments are necessary. I would think that VE is the same way. ??
Are you absolutely sure about the corrections being built into AVIA?
The reason I ask is because I thought I read in one of Guy's post that he didn't use the corrections because he had know way of knowing what everyone would use as measuring devices. Seems like he used ETF and a preamp mic setup himself. I've also read where others are using Spectra Plus and they use the RS mic compensation for monitoring or recording AVIA sweeps.
I'm very curious about this.