By
Roberto Buonanno,
published on December 16, 2004
Source: Tom's Guide US | Keywords: notebook, cooler, pads | Themes: Business Notebooks
Source: Tom's Guide US | Keywords: notebook, cooler, pads | Themes: Business Notebooks
Contents
5. Noise Level Analysis Device
SA-3055 One-third Octave Real-Time Audio Analyzer
| Instrument Type | ANSI Class II real-time audio |
|---|---|
| Analyzer Inputs Microphone | Balanced low impedance |
| Connector | 3 pin XLR female |
| Impedance | Suitable for 150 ohm microphones, actual impedance is 5 Kohms |
| Phantom Power | +12V simplex |
| Acoustical Signal Level | 44 dB SPL to 136 dB SPL |
| Instrumentation | High-impedance, unbalanced input |
| Connector | RCA |
| Impedance | 1 Mohm in parallel with 30 pF |
| Signal Level | -56 to +36 dBu |
| Balanced Bridging | Balanced, high-impedance input |
| Connector | ΒΌ" tip-ring-sleeve phone jack |
| Impedance | 10 Kohms |
| Signal Level | -56 to +36 dBu |
| Filters | |
| Filter Characteristic | Fourth-order bandpass. Meets or exceeds ANSI S1.11-1986 ClassII, Type E specifications |
| Frequency Range | 30 1/3 octave bands from 25 to 20 kHz on |
| Display | |
| Spectrum Display | 9x30 LED matrix |
| SPL Display | 9 LED bar graph (4dB resolution) |
| 4 digit full-screen display (1/10th dB resolution) | |
| Website | http://www.audiocontrol.com/MobileAudio/Products/Analyzers/index.html |
We measured the sound levels produced by the units with two SA-3055 devices (one per channel) paired with special high impedance microphones. These were provided courtesy of Mr. Guido Marinello, official referee for SPL (Sound Pressure Level) competitions in Italy. He assisted us during all tests, and personally positioned the two microphones to correspond to where the ears of a virtual user would be.
The tests were done in an ordinary office environment.
High Impedance Microphone - handle with care!
- Previous page Test Configuration
- Next page Noise Level Tests
Here is my situation, I like to lay in bed at night and surf and play games. I have an Acer Aspire 5100 (which I think is a well designed laptop). I noticed a tiny spot on the top panel by the space bar, just above the power supply where the plastic had actually softened and began to melt a little. Yikes!!! Obviously it was from setting the laptop on the covers and blocking the air intakes. I think my solution will be to buy both the aluminum model for home use and the thin plastic model to carry in my bag. I also have fabricated a very thin an lightweight 1/8" piece of birch wood to set the cooling pads on. This should solve it. Now I just gotta go look around and find them and buy them.
Birch wood?
who are you grisley adams?