question for TermLab experts!
02-18-2005, 08:00 PM
#1
0 Watt CAFz'r
Thread Starter
Join Date: Jun 2004
Posts: 14
I just got my TermLab USB and am starting to learn its workings. I see that the sensor is registering between 100 and 105 db in a quiet car interior! I've got the MIN setting at 100.... does this seem right? I've heard the sensor isn't really accurate below 120 db - which is fine, but I'd like to confirm.
Any other tips? The meter seems to do exactly what i'd expect - and easily! No complaints other than measuring 105 db in a quiet car interior! any thoughts?
bmoney
Any other tips? The meter seems to do exactly what i'd expect - and easily! No complaints other than measuring 105 db in a quiet car interior! any thoughts?
bmoney
02-18-2005, 08:26 PM
#2
500 Watt CAFz'r
Join Date: Mar 2004
Posts: 820
Mine sometimes measures upto 125 db's when quite. I posted a thread on termpro and they told me it's due to a dirty power supply, ie bad wall socket.
The meter is said to still read accurate, just reads those DB's when the system isn't on because of that.
The meter is said to still read accurate, just reads those DB's when the system isn't on because of that.
02-18-2005, 08:43 PM
#3
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Join Date: Jun 2004
Posts: 14
Right on....I can't see how a fully charged drycell/deep cycle battery directly connected to the control box could be dirty? Although I've tried it with several outlets in the same house and arrived at the same "resting" reading of 100 ish.....
As long as the readings are dead accurate like the industry says it is, then I don't care about how low it reads. I'm going to set the threshold back up to 110 so that I simply don't see it...
thanks!
bmoney
As long as the readings are dead accurate like the industry says it is, then I don't care about how low it reads. I'm going to set the threshold back up to 110 so that I simply don't see it...
thanks!
bmoney
02-19-2005, 12:50 AM
#7
interesting to see ppl with no recent termlabs giving advise
anyways, whatever your termlab is doin its fine. never unplug it when its on, NEVER.
your mic will do a reading even with no input into the mic, thats normall.
the USB version reads 0.7 db higher than the .NET set up (the big official one)
and dont play with your K-Factor, just set it to what it says on your mic and leave it.
anyways, whatever your termlab is doin its fine. never unplug it when its on, NEVER.
your mic will do a reading even with no input into the mic, thats normall.
the USB version reads 0.7 db higher than the .NET set up (the big official one)
and dont play with your K-Factor, just set it to what it says on your mic and leave it.
02-19-2005, 07:26 AM
#8
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Join Date: Jun 2004
Posts: 14
Excellent. This unit is BRAND new, we're talking 3 days old here [img]smile.gif[/img] Yeah, I played again and it definitely jumps around the 100 db mark. I also noticed (as stated above) that without the sensor even plugged in it reads this....
Yah, and unplugging things while they're on is not usually a good idea [img]smile.gif[/img] I boot the computer, plug in the control box to usb, plug in lan cable and then plug in sensor. I reverse this order exactly when shutting down...
thanks for the advice!
bmoney
Yah, and unplugging things while they're on is not usually a good idea [img]smile.gif[/img] I boot the computer, plug in the control box to usb, plug in lan cable and then plug in sensor. I reverse this order exactly when shutting down...
thanks for the advice!
bmoney
02-19-2005, 07:39 AM
#9
u should have everything plugged in and ready to go before u actually start the termlab software. and when u are done first thing u should do is shut down the software and then unplug things.
have fun with your new toy!
have fun with your new toy!
02-27-2005, 05:34 PM
#10
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Posts: n/a
I usually see around 100-105 dB with my TL USB - it ca be attributed to the low signal to noise ratio between the pressure transducer and the D/A converter. Once the SPL is over 120dB, everything is just fine...
If it's really bothering you, you can set the low SPL threshold to something like 107dB and it will show 0dB untill you hit that mark.
Another option is to build you own power supply that is quieter than the wall-wart that the unit comes with - but I'd vote that that's overkill.
Anyways, it's working fine... enjoy!
If it's really bothering you, you can set the low SPL threshold to something like 107dB and it will show 0dB untill you hit that mark.
Another option is to build you own power supply that is quieter than the wall-wart that the unit comes with - but I'd vote that that's overkill.
Anyways, it's working fine... enjoy!
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