olympus recorder dm-420
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Olympus Digital Voice Recorder DM-420 List Price: $249.99 Sale Price: Too low to display Used From: $79.99  |
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An ultra high-quality stereo microphone steps up to the plate and special sound editing software brings it on home. And in between are a series of features-from 2GB of internal memory, to MP3 and WMA recording format capabilities, to sophisticated user-friendly editing software-that make the DM-420 the recorder of champions. |
Is this Olympus DM-420 digital recorder completely SILENT?
http://www.amazon.com/Olympus-Digital-Voice-Recorder-DM-420/dp/B002JTX87W/ref=pd_rhf_p_t_3
I want to know if I hide it in a room, set to record for like 3 hours, will it be completely silent without any clicking of any kind, and will it record for that long with no one being aware of it (no noise coming from it).
sure, could be done. recording voices in a situation where people have a reasonable expectation of privacy could lead to legal difficulty if done without a court order.
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Whatâs Shaking in Electrophysiological Research?
Electrophysiology requires accurate measurements free of interference from outside sources such as electrical impulses and vibrations.
Phoenix, AZ - Electro-physiologists studying the flow of ions in biological tissues must create an environment free of electrical interference and mechanical vibration. The various recording techniques used to measure electric current or fluctuations in voltage are not reliable unless such noise is eliminated.
In order to study the electrical properties of cells and tissues, first make a connection between the inside of the cell or tissue and an amplifier. This connection is made with a glass pipette. A metal electrode or wire is connected to an amplifier, and the electrode is inserted into the pipette which is also filled with a particular solution (such as a chloride-based salt solution). The pipette is maneuvered into place against the exterior wall of a tissue or cell with micromanipulators and held in place with suction. The suction pulls wall membrane into the pipette making the electrical connection. Once the connection is made, the scientists can hold the current constant and measure changes in voltage, or vice versa. This electrophysiological recording technique is known as patch clamp. There are several variations of patch clamping.
In every instance, however, mechanical vibration and electrical interference frustrate data collection. Electrical interference can be minimized by placing a Faraday cage over the microscope workstation. Microscope manufacturers work diligently to design microscopes that do not create vibrations by virtue of their own operation. Popular models include: (1) Leica DM LFS, (2) Nikon Eclipse E600FN, (3) Olympus BX51W1/BX61W1, and the (4) Carl Zeiss Axio Imager. Nevertheless, environmental vibrations will still disrupt an electro-physiologists work.
An answer for the environmental vibration problem that does not create electrical field interference is required. An effective solution is a mechanical and passive vibration isolation bearing combined with a platform that is compact and designed for the footprint of the instrument to be isolated. Such a vibration isolation platform does not create electrical interference since it does not have air hoses or supporting computer hardware, and therefore it can be placed inside the Faraday cage.
About the Author
Paul Attaway is founder and President of Vistek Inc. For over ten years Vistek has been a leading provider of highly effective, yet simple vibration isolation solutions for challenges faced in the life sciences and semiconductor industries. Paul Attaway also founded, built and then sold Tekton Inc., a solutions provider for data centers mitigating the risk that earthquakes pose to safety and continued operations. Paul firmly believes that the most elegant solutions are simple and arrived at through close communication with customers. Prior to entering the business world, Paul practiced law in Phoenix, AZ. Paul graduated in 1988 from the University Of Georgia School Of Law and from Georgetown University in 1985 with a degree in finance.
Contact: Paul Attaway
Address: 1741 W. University Drive, Ste 146. Tempe, AZ 85281
Toll free: 602-426-1211
Fax: 602-426-1611
Email: PAttaway@truegravity.com
Website: http://www.vistekinc.com
