Below is the list of meters that meet the MILSTD1474D.

- B&K 2209
- B&K Pulse
- Larson 800B
- Roin NA-42 *Sampling frequency 250 kHz*
- National Instruments
- Adlink USB-2405
- RogaDAQ 4
- Measurement Computing DT9837 Series

You need a meter with <20 microsecond rise time with impulse PSPL of a gunshot. Those start at about 20 times the price of that industrial environment 3M meter. For detecting the Peak are found in the standards IEC 60651 (2001) and IEC 60804 (2000), which have both now been superseded by standards ...

B&K 2250 Specifications
Rated for <100 μs according to their published manuals.

What are the thoughts on the Larson & Davis 814 sound meter , Written in the manual Rise time is 25 micro seconds ?

I started the calibration and adjustment procedure I checked the power supply. The voltage in the center transformer is w/in spec as shown on my schematic attachment. -8.5 Vdc measured vs. 9V schematic. 4.12 Vdc measured vs. 5V schematic. -3.6 Vdc measured vs. -2.9V schematic. https://i.imgur.com/8e...

When you test it w/ the Pistonphone, what are your results? 124DB What are the frequencies you're testing the gunshots at? PLS explain Different weightings aren't meant to yield the same dB # Be equal if the frequency is 1000 Hz , at a given Hz. That's one of the points I was trying to make in my p...

Equipment: B&K 2209 meter B&K type 4136 ¼” microphone B&K type 4220 pistonphone I tested on AK47 and had the results *Ammo:123g 7.62x39 Frequency weighting "A" and meter switch "Peak hold" AVG:158.7DB Frequency weighting "D" and meter switch "Peak hold&...

doubloon wrote:Google provided me an answer in 0.71 seconds.

I am talking about a problem reading a measurement in a B&K 2209 meter , not about general information in Google

Hello , Is there a difference in the weighting frequency between "A" and "D" ? When I put frequency weighting "A" and meter switch "Peak hold",My B&K 2209 measures about 6db low, I suspect the sensitivity is the problem. How can I repair the meter? Kind Re...

Anyone know What software is available to calibrate and analyze recorded sounds, for the purpose of determining average SPL

Info
captures noise data using the AC output from a b&k 2209 direct to PC.

Thank you for your reply.

I have scale 2B goes to 160dB and Also, I have 4220 pistonphone
I think Diaphragm that is the problem!!

Hello,, Today I got the b&k 2209 , after turn switch to "Bett.(rec)" the batteries good,then turn switch to "fast" ,weighting networks switch to "c". There is no response to The cursor,does not work !!! After checking the microphone I found is damaged. Is this why h...

Regarding B&K 2209
Can I use the B&K 4135 microphone with adapter directly on (Input stage ZC 0007)
For information Type 4135 frequency Response 100 kHz

I know you need a fast rise time approaching 20 micro secs,
But i did not find any document about value of Peak Rise time.

up

What about a Bruel Kjaer 2260? , Can I use B&K 2260 for standard for suppressor testing?

regards
Sofyan

Twisted cone design pics

Impressive, looks like it can only be made by 3D printing. Or a lot of machine hours and welding.

To not require 3D printer, images baffle

Is there a Relation between Sampling interval and Peak Detector Rise Time?

I have no experience w/ the one you listed so take this as just a cost reference. A LarsonDavis LXT1QPR (quite possibly the standard for suppressor testing), w/ the mic kit, tripod, accessory kit, etc, is about $4k. You can also rent the above for ~$800/month Thank you for your reply. The Larson Da...

What about a ONO SOKKI LA5111? , I know you need a fast rise time approaching 20 micro secs ?

Like This One??

http://www.hitechfacility.co.jp/details.php?id=E0002902

regards
Sofyan

I want to know clip baffle. Affect in a positive way in the design

Thank you I'm from morocco. I do not have machines. Working on the design, then we deal of the workshop for manufacturing. How are the gun laws in Morocco? Did not know silencers where allowed there? Gunny Yes, there are complex controls for the issuance of licenses. The licenses give the weapon hu...

Welcome new member. Nice drawings, you mentioned 7075 tubing, so my guess is that you are machining these from bar stock? Where are you located? What are your machining skills? What machines do you have? Sorry for all the questions but this helps in future explanations of options / regulations PS y...

Hi everyone, I am working on a supressor design for ak47 Which is better in design http://i1148.photobucket.com/albums/o577/sasgun/Assem1_zps1xhqvwg6.png Tube: 7" al 7075 1.5" OD, .12" walls threaded on both ends to 24 TPI Mount: 304 Stainless threaded to 14x1 LH Endcap: 304 stainless...