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FOUR-CHANNEL MOVING AVERAGER
(Model: MA-821/RSP)
New model! Used to quantify multi-unit nerve and muscle activity in rodents

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The MA-821/RSP is the latest incarnation of one of our first commercial instruments.
The Moving Averager (MA), or Paynter filter, has long been used to quantify multi-unit nerve and muscle activity. For example, the MA is strongly correlated with the force of contraction of a muscle at any given time. It employs a precision, full-wave rectifier and third-order filtering to create a smoothed envelope around the nerve or muscle burst. This approach has the advantages of a high degree of smoothing, while retaining a fast dynamic response, so no details of the electrical activity are lost. The time constant (TC) determines the amount of smoothing. The Moving Averager should not be confused with "leaky integrator" or other simplified first-order circuits that do not preserve the dynamics of the signal.

Convenient Features:
The MA-821/RSP is a rack-mountable instrument with four independent signal processing channels. Each has pushbutton-selectable time constants, so the averaging time can be changes instantaneously. The gain and offset is adjustable using panel mounted controls. Input, rectified output, and MA output jacks are located on front and rear panels for convenient rack wiring.

Programmable Time Constants:
This new version of the instrument is completely redesigned, and features all-electronic switching of the three Time Constant Modules included with each channel. A microprocessor and non-volatile memory store the settings, and restore them the next time the instrument is used. The standard TC's provided are 50, 100, and 200mS. The time constants are programmed using interchangeable Time Constant Modules (three per channel), so any values in the range 10 - 500mS can be specified. These modules are available separately (Part No. MA-821-TCM), and can be changed by the user as needed.

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Input type and impedance Single-ended, 1MOhms impedance
Input voltage range +10V
Gain range 1-10X
Coupling AC or DC, switchable
Offset adjustment (Position) range, activated with push/pull switch +2.5V
Moving Average output +10V, 10mA max
Full-wave Rectified output +10V, 10mA max
Moving Average function 3rd-order Paynter filter
Moving Average Time Constants 50, 100, and 200mS standard
Input and output connectors BNC jack
Power requirements 120/240VAC 50/60Hz, switch selectable
Dimensions 17.2W x 3.5H x 12.5D inches (44 x 9 x 32cm)

Model:
MA-821/RSP
Four-Channel Moving Averager
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Bioseb - In Vivo Research Instruments
Phone worldwide : +33 442 344 360 - USA/Canada : (727) 521-1808
e-Mail : Worldwide: info@bioseb.com - USA/Canada: info-us@bioseb.com