GTA
Support Equipment For PCP/HPA/CO2 and springers ,rams => Support Equipment For PCP/HPA/CO2 => Topic started by: Earl on September 23, 2022, 03:10:35 PM
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What is the difference in Peak and Max decibels?
Which one should I use for airguns?
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What phone?
The thing about apps for a phone is your not getting a calibrated mic so the readings are mostly suspect.
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What phone?
iphone 7
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Best I can offer is this.
https://apps.apple.com/us/app/niosh-slm/id1096545820 (https://apps.apple.com/us/app/niosh-slm/id1096545820)
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Should I use Lmax or LCpeak for airgun shots?
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https://acousticalengineer.com/are-lpeak-and-lmax-different/ (https://acousticalengineer.com/are-lpeak-and-lmax-different/)
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Thank you, Privateer.
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I'm not a big Fan of Apps to do a definitive sound reading.
To many variables involved.
Now I did go to a school for running Sound Boards for Bands years ago.
Even some of the best stuff We used back then was subject to SO MANY things that could be wonky.
But I have beat Court Cases based on wrongfully obtained Sound levels.
Mostly for tickets for loud exhaust on motorcycles. Not real popular with the local LEO's for that!
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CDC did some work on this and came up with an iPhone app.
https://www.cdc.gov/niosh/topics/noise/app.html (https://www.cdc.gov/niosh/topics/noise/app.html)
There is a low cost mic you can add
https://www.amazon.com/Dayton-Audio-iMM-6-Calibrated-Measurement/dp/B00ADR2B84 (https://www.amazon.com/Dayton-Audio-iMM-6-Calibrated-Measurement/dp/B00ADR2B84)
I don't have an iPhone so I have not tried the app. The mic works reasonably well.
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I measured the peak decibels of my stock Gauntlet .177 on my iphone 7 near the shooter's ear.
NIOSH app averaged = 111.1 decibels
Decibel X app averaged = 99.3 decibels
These measurements were taken at the same location within 10 minutes of each other.
I don't understand the big difference.
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Interesting, are you using the same settings on both (MAX, fast, A or C weighted, etc)?
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Interesting, are you using the same settings on both (MAX, fast, A or C weighted, etc)?
Using the PEAK in Decibel X.
Using the LCpeak in NIOSH SLM.
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I tend to use MAX. I think the instantaneous PEAK is too short of a duration and too variable. Everything I've read points to the ear needing time to respond, basically collect some energy.
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I tend to use MAX. I think the instantaneous PEAK is too short of a duration and too variable. Everything I've read points to the ear needing time to respond, basically collect some energy.
OK, I will try MAX in both apps and post the results.
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NIOSH max NIOSH peak Decibel X max Decibel X peak
Stock baffels Stock baffels Stock baffels Stock baffels
91.7 avg 108.2 avg 86.9 avg 96.2 avg
Yes, the max seems more reasonable.
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Thats a moot queation!
They might give great response but in reality the microphone is rated in the 200-3000kHz band double if best.
The next problem is response time, what if your impulse is 1 milli second (I dont know what 1/1000 second is in imperial) and your phones electronics responce time is 2ms. so the sound burst is over before the phone even begins to register.
Thats going to give a nice flat curve!
A true sound monitor rated to 165+Db goes for more than $3000. And thats no Fluke!
https://duckduckgo.com/?q=gun+rated+sound+meter&t=ffsb&ia=web