DAM50細胞外生物放大器
DAM50 Extracellular Amplifier
型號： SYS-DAM50

• 低噪音細胞外生物放大器。
• 採用高品質組件製成，確保最小化內在(散粒)雜訊。
• 電池供電，以消除線路噪音。
• 手持式。
• 可安裝於機架上。

特色

WPI的 DAM系列放大器是知名的細胞外電位放大業內標準。此款電池式生物放大器的緊湊設計，讓研究人員放置在離待測物更近的位置，有效減少過長導線造成的噪音。每個放大器均搭配可調式高/低濾波器，和一個位置控制(position control)用於抵消紀錄時產生的偏移電位。模式選擇功能提供的附加功能，對於特定應用上十分有用。

差分放大(Differential Amplification)以減低噪音

在生物電紀錄，差分放大對於減少永遠存在的電源線感應所造成的噪音干擾來說十分重要。設計精良的差分放大器將顯著減輕電源線(電源)噪音。最為重要的是製備物與電極連接並接至絕佳的電器接地，以及DAM50本身的接地線，此方式應該可以大幅減低靜電感應電勢產生的影響。除了製備物接地以外，兩個差分輸入連接必須透過合適電極施用紀錄點，用以優化紀錄生物電位差。

 可攜帶性

DAM系列放大器可在任何桌面上，作為一個獨立裝置使用，或是使用選配的安裝夾具零件，方便的將其安裝在工作區內。此外，標準型裝置機架可使用機架安裝套組(#3484)安裝2組放大器。多種掛勾配件，可搭配您的需求選購。

規格

下列DAM 50 頻寬圖表顯示放大器在使用多種濾波器和增益下的反應。

The following bandwidth charts for the DAM50 show the response of the amplifier when various filters and gains are used.

增益：上方圖表顯示標準3分貝頻率在最高過濾帶通過時切斷。

GAINS: This chart shows the standard 3dB frequency cutoff at  maximum filter band pass.

過濾器：設定AC x 1000增益下使用各種低通量和高通量濾波器，以顯示DAM 50放大器的頻寬。

FILTERS: Various low pass and high pass filters were applied at the AC x1000 gain setting to show the bandwidth of and actual DAM50 amplifier.

金屬電極的差分應用

下圖顯示金屬電極的兩種應用。

第一個範例顯示EP1銀/氯化銀電極小球焊接至放大器電纜，此亦顯示一個差分組態(differential configuration)。EP1適合用於小鼠顱內應用，此種應用需用到延長線纜，將其連接到DAM 50電纜上的白綠色GND接線。

The images below show two applications for metal electrodes.

This first example shows an EP1 silver/silver chloride electrode pellet soldered to the amplifier cable. This shows a differential configuration. The EP1 is suitable for use in a mouse cranial application. To do so, it needs an extension wire to connect it to the white-green GND junction on the DAM50 cable.

第二種範例中，密封的RC1 銀/氯化銀電極小球牽線連接至放大器電纜，此亦顯示一個差分組態(differential configuration)。

In this second example, a sealed RC1Ag/AgCl electrode pellet is wired to the amplifier cable. This also shows a differential configuration.

Features

WPI’s DAM series amplifier’s are well known as a standard of the industry for extracellular potential amplification. These battery powered bio-amplifiers are designed with a compact chassis profile that lets you locate the extracellular amplifier closer to the preparation. This minimizes long lead lengths which contribute to noise. Each amplifier is equipped with selectable high and low filters, and a position control to offset galvanic potentials which may develop during recording. A choice of models offer additional features that are useful for certain applications.

Reducing Noise with Differential Amplification

Differential amplification is of great importance in bioelectric recording to reduce the ever present effect of noise interference from power line induction. A well designed differential amplifier will significantly diminish power line (mains) noise. It is most essential that the preparation be connected with an electrode to a good electrical ground as well as to the grounding wire of the DAM50 itself. This should have the effect of greatly reducing electrostatically induced potential. In addition to the preparation ground, two differential input connections must be made via appropriate electrodes applied to the recording site so as to optimally record a bioelectric potential difference.

Portability

DAM series amplifiers can be used as standalone units on any tabletop, or use optional clamp-mounting hardware to locate them conveniently within the work area. Alternatively, a pair of amplifiers can be mounted into a standard equipment rack with a rack mount kit (#3484). A variety of hook up accessories are available to configure your application.