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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Technical term needed
What is the name for the electronic device that measures decibel levels?
Steve |
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SteveB wrote:
What is the name for the electronic device that measures decibel levels? Steve A decibel meter, aka db meter. Said to be "about $50 on ebay" but not by me. GWE |
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It's a sound pressure meter
SteveB wrote: What is the name for the electronic device that measures decibel levels? Steve |
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"SteveB" wrote in message news:OTrWd.161$qf7.129@fed1read03... What is the name for the electronic device that measures decibel levels? Steve This is not a question with an easy answer. The decibel is a relative measure, i.e., it is the ratio of two power levels expressed as a logrithm (dB = 10 log P1/P2). Sometimes, sound levels are measured in decibels referenced to the threshold of audibility. Commonly, radio frequency power is expressed in decibels referenced to a milliwatt (dBm) or to a watt (dBW). Antenna gain is expressed in dB referenced to the performance of an isotropic antenna. If the impedences are constant, since P = E squared / Z, decibels can express the ratio of two voltages (dB = 20 log E1/E2). Hence, the signal level into a receiver is often expressed as decibels referenced to a microvolt (dBuv). The list goes on and on... And a wide variety of instruments are used to make the various measurements. Jerry |
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"SteveB" wrote: What is the name for the electronic device that measures decibel levels? ^^^^^^^^^^^^^ The commonly used term that I know is "sound level meter." |
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On Sat, 5 Mar 2005 16:10:26 -0800, the inscrutable "SteveB"
spake: What is the name for the electronic device that measures decibel levels? Those at Rat Shack are called "sound level meters". ================================================== ======== Save the ||| http://diversify.com Endangered SKEETS! ||| Web Application Programming ================================================== ======== |
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Nice answer to an indepth question, Jerry.
Bob Swinney "Jerry Foster" wrote in message om... "SteveB" wrote in message news:OTrWd.161$qf7.129@fed1read03... What is the name for the electronic device that measures decibel levels? Steve This is not a question with an easy answer. The decibel is a relative measure, i.e., it is the ratio of two power levels expressed as a logrithm (dB = 10 log P1/P2). Sometimes, sound levels are measured in decibels referenced to the threshold of audibility. Commonly, radio frequency power is expressed in decibels referenced to a milliwatt (dBm) or to a watt (dBW). Antenna gain is expressed in dB referenced to the performance of an isotropic antenna. If the impedences are constant, since P = E squared / Z, decibels can express the ratio of two voltages (dB = 20 log E1/E2). Hence, the signal level into a receiver is often expressed as decibels referenced to a microvolt (dBuv). The list goes on and on... And a wide variety of instruments are used to make the various measurements. Jerry |
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SteveB wrote:
What is the name for the electronic device that measures decibel levels? Steve Sonometer? -- Gary Brady Austin, TX www.powdercoatoven.4t.com |
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WHAT????
"SteveB" wrote in message news:OTrWd.161$qf7.129@fed1read03... What is the name for the electronic device that measures decibel levels? Steve |
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In article , Jerry Foster
says... And a wide variety of instruments are used to make the various measurements. It's true you could use a yardstick and measure two distances, so it would be 20log(10)d1/d2 to give distance, say, measured in dB form. Or weight, with a scale. Or a simpson meter measuring some dc voltage. But I think he was probably after a 'sound power level meter' even though he didn't come right out and say 'sound' in his question. :^) Jim -- ================================================== please reply to: JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com ================================================== |
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Grant Erwin wrote:
SteveB wrote: What is the name for the electronic device that measures decibel levels? Steve A decibel meter, aka db meter. Said to be "about $50 on ebay" but not by me. GWE Are you measuring voltage or sound ? - db is a measurement of 'pressure'... dbA Be sure you know what type you are looking for. Martin -- Martin Eastburn, Barbara Eastburn @ home at Lion's Lair with our computer NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder |
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SPL meter. (stands for Sound Pressure Level Meter)
They come in all sorts and functions. As cheap and limited as Radioshack meters with just A and C weighting, or as expensive as as Bruel & Kjers or Terrasondes with direct reference to ANSI standards, frequency bands, time measurement options, interchangeable microphones, etc.... If you are a neofite and just need an approximate reading, the Radioshack will do fine. If you need something that will hold up in court then hire an acoustician. He/she will come equipped with appropriate measurement system. cheers T. Alan "SteveB" wrote in message news:OTrWd.161$qf7.129@fed1read03... What is the name for the electronic device that measures decibel levels? Steve |
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