Bio-Amplifier with active probe
- Low noise, battery-operated amplifier
- Includes low-noise headstage
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 the user to 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. A choice of models offer additional features that are useful for certain applications. The startup kit (included) is shown in the image below.
Current Generation
Gated or manual current generation for histological marking, iontophoresis, or cell stimulation.
Remote active headstage
DAM80, an AC amplifier only, features a very low noise headstage probe which can be mounted in micromanipulators for up-close cortical recording, for extracellular recording from high impedance glass or metal microelectrodes. Also provides a gated current for tissue marking.
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
Specifications
| INPUT IMPEDANCE | 1012Ω, common mode and differential |
| INPUT LEAKAGE CURRENT | 50pA (typical) |
| COMMON MODE REJECTION RATIO | 100dB @ 50/60Hz |
| INPUT CAPACITANCE | 20pF |
| AC MODE NOISE | 0.4uV RMS (2uV p-p) 0.1-100Hz |
| AC MODE NOISE | 2.6uV RMS (10uV p-p) 1Hz-10 kH |
| BANDWIDTH FILTER SETTINGS, AC Mode | Low frequency, 0.1, 1, 10, 300 Hz |
| BANDWIDTH FILTER SETTINGS: AC Mode(DAM80) | High frequency, 0.1, 1, 3, 10 kHz |
| OUTPUT CONNECTORS | 3.5mm MiniPhone connector on DAM80 |
| OUTPUT VOLTAGE SWING | ±8V |
| OUTPUT IMPEDANCE | 470ohm |
| BATTERY TEST | Audible tone |
| CALIBRATOR SIGNAL | 10Hz square wave |
| POSITION | Approximately 250mV |
| CURRENT SOURCE:DAM80: DC Generator | 0 to ±50uA, variable |
| EXTERNAL COMMAND | Input Voltage ±10V commands |
| AC or DC current waveform | ±50uA max. amplitude @ 200ohm |
| BATTERIES | 2 x 9V alkaline (included) |
| DIMENSIONS:DAM80 | 7 x 4 x 1.75 in. (17.8 x 10.2 x 4.4 cm) |
| SHIPPING WEIGHT | 3.5 lb (1.6 kg) |
- Accessories
| DAM80P | Replacement Probe |
| CBL102 | 3.5mm Phone plug to BNC Cable |
| 2851 | BNC-to-BNC Cable |
| 2033 | Black Insulated Mini-Banana Plug |
| 2034 | Red Insulated Mini-Banana Plug |
| 2035 | Uninsulated Mini-Banana Plug |
| 2102 | 9V Alkaline Battery, each (2 required) |
| 3484 | Rack Mount Kit (for 2 DAM preamps) |
| 3485 | Ringstand Mounting Kit |
| 5469 | Metal Micro electrode Adaptor (DAM80) (mini banana plug to 0.031 in. socket) |
| 13388 | Adapter, mini-banana plug to 2mm socket |
| 5371 | Cable, Low noise (2mm pin to 2mm pin) |
| 3578 | Adapter Cable for Ag/AgCl pellets (2mm pin) |
| 300102 | Electrode Extension, 4" |
| 3414 | 9V NiMH Battery |
The DAM80 Startup Kit includes: 2-CBL102, 5469, 2-13388, 3294, 2033, 2034, 2-2035
-Application Notes
Mutliple applications are available with a variety of options. Here you can see two setups.
DIFFERENTIAL APPLICATION FOR METAL ELECTRODES
In this setup, metal electrodes are used with a differential amplifier. In this setup, a DAM80 is shown, but you could easily substitute a DAM50 (with 5489), ISO-DAM8A (with 74040) or ISO-80.
EXTRACELLULAR APPLICATIONS UTILIZING GLASS
For rare instances when using extracellular amplifiers with glass, you could use the setup shown below. In this setup, a DAM80 is shown, but you could easily substitute an ISO-DAM8A (with 74040) or ISO-80. Likewise, this setup shows the 2505 handle (1/4" - 6.3mm), but if you have a smaller micromanipulator, you may need the 5444 handle (3/16" - 4.8mm). In this illustration, MEH7W-10 is used, but any glass-size MEH7W could be used. (MEH7W-10 is 1.0mm glass, MEH7W-12 is 1.2mm glass, MEH7W-15 is 1.5mm glass and MEH7W-20 is 2.0mm glass.) EP2 is used for grounding in the illustration.
For single-ended applications, however, a 2033 wire adapter on the black connector socket can be connected to the 3294 cable. The tip used depends on your specific needs. In the illustration, TIP1TW1 was suggested. NOTE that the glass is not shown in the illustration below.
