DAM50 Extracellular Amplifier

$1,647.00
Prices valid in USA, Canada, and PR only.
Order code
SYS-DAM50
Prices valid in USA, Canada, and PR only.

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 enables you locate the unit closer to the preparation and thereby minimize 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.

DAM series amplifiers can be used as stand-alone 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.

To learn more about our warranty options, click here.

Prices valid in USA, Canada, and PR only.

See the current Spec Sheet.

See what you need to know before you buy an amplifier.

A family of very low noise battery-operated amplifiers

Features

  • Battery powered to eliminate line noise
  • High pass and low pass filtering
  • Single ended or differential operation
  • DC/AC amplification
  • Variable output positioning
  • Constructed of high quality components to ensure minimal intrinsic (shot) noise
  • Portable
  • Rack mountable
  • The DAM50 package now includes the 300647 shielded metal electrode cable and one shielded modular cable.

Benefits

  • Very low internal noise
  • Ultra quiet DC power supply ­— no AC required
  • Intrinsic low susceptibility to ground loops
  • Small footprint
  • Cost-effective
  • Electrostatic Discharge Protection!
  • Premium Warranty Available

Applications

  • Amplifying biopotentials from metal electrodes
  • Brain slice field stimulation
  • EAG (Electroantennogram)
  • ERG (Electroretinogram)

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.

Feature Comparison Chart

Type DAM50 DAM80
Input Mode AC/DC AC
Input Configuration Differential/Single Ended Differential
Gain Range 100-10,000 (AC)
10-1,000 (DC)
100 - 10,000 (AC)
High/Low Filters Yes Yes
Offset Position Control Yes Yes
Current Generator No Yes
Remote Active Headstage No Yes
Output Connection BNC 3.5 mm mini phone
Standard Input Connection unterminated wire Mini banana
Power Supply (2) 9V alkaline batteries (2) 9V alkaline batteries

      

Differential Applications for Metal Electrodes

The images below show two applications for metal electrodes.  

In this first example, a sealed RC1T Ag/AgCl electrode pellet is wired to the amplifier cable. This also shows a differential configuration.

DAM50

This second example shows an EP2 silver/silver chloride electrode pellet connected to  the amplifier adaptor 5389. This shows a differential configuration. The EP2 is suitable for use in a mouse cranial application. To do so, it needs an extension wire 3294 to connect it to the 5389 adaptor.

Dam50

More Information
SKU SYS-DAM50
Upsell Products
  1. Tungsten Profile C, 127 mm long Tungsten Profile C, 127 mm long
    In stock
INPUT IMPEDANCE 1012 Ω, common mode and differential
INPUT LEAKAGE CURRENT 50 pA (typical)
MAX. DC DIFFERENTIAL SIGNAL ±2.5 V (DAM 50)
GAIN AC: 100x, 1000x, 10000x, DC: 10x, 100x, 1000x (DAM50)
COMMON MODE REJECTION RATIO 100dB @ 50/60 Hz
INPUT CAPACITANCE 20 pF
AC MODE NOISE 0.4 μV RMS (2uV p-p) 0.1-100 Hz
AC MODE NOISE 2.6 μV RMS (10uV p-p) 1 Hz-10 kH
DC MODE NOISE (DAM50) (DAM50) 7.5uV RMS (30uV p-p) 3-10 kHz
BANDWIDTH FILTER SETTINGS:AC Mode Low frequency, 0.1, 1, 10, 300 Hz
BANDWIDTH FILTER SETTINGS: DC Mode(DAM50) High frequency, 0.1, 1, 3, 10 kHz
OUTPUT CONNECTORS BNC
OUTPUT VOLTAGE SWING ±8 V
OUTPUT IMPEDANCE 470 Ω
BATTERY TEST Audible tone
CALIBRATOR SIGNAL 10 Hz square wave
POSITION Approximately 250 mV
EXTERNAL COMMAND Input Voltage ±10 V commands
AC or DC current waveform ±50μA max. amplitude @ 200 KΩ
BATTERIES 2 x 9 V alkaline (included)
DIMENSIONS:DAM50 8 x 4 x 1.75 in. (20.3 x 10.2 x 4.4 cm)
SHIPPING WEIGHT 3.5 lb. (1.6 kg)

The following bandwidth charts for the DAM50 show the response of the amplifier when various filters and gains are used. For larger images, click on the thumbnails below. 

Bandwidth charts for the DAM50

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

The standard 3dB frequency

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.

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