Kation Scientific ExAmp-20K User Manual
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ExAmp-20KS Extracellular Spike AmplifierUser guideThe ExAmp-20K is an AC-coupled spike amplifierdesigned for low-noise extracellular recording fromsingle- or multiple units. Its unique headstage probedesign puts the first stage of amplification at themicroelectrode interface, resulting in less externalinterference noise pickup. The built-in filters areoptimized for solid-conductor microelectrodes suchas carbon fiber, tungsten or stainless steel. Theincluded 60 Hz (or 50 Hz, selectable) reject filter andour special electrode holder adapters virtually elimi-nate the need for Faraday cages. Front and rear panelcontrols are intentionally simplified for ease of usewithout compromising the quality of recordings.The positive input of the front amplifier (center pinof the headstage’s SMA receptacle) is referenced tothe ground (ground socket) providing high-quality,single-ended (monopolar) recordings. The ExAmp-20K can be used for research and teaching purposesonly that do not involve human subjects.Main unit specificationsInput impedance: 1013 ΩInput bias current: 2 pASystem gain: 200x to 20,000x in 7 calibrated stepsSystem noise: > 2.5 μV peak to peak with probe input groundedBandpass filter: 300 Hz to 8000 Hz, built-in Butterworth 4-poleNotch filter: 50/60 Hz, selectable inside the boxOutput voltage swing: ±10 V, maximumPower source: External, 12 VDC power supplyPower consumption: 200 mA, maximumAmplifier (Gnd) ground: Isolated from DC input ground (Case)Dimensions: 155 x 54 x 175 mm aluminum boxWeight: 1.35 lb (614 grams)Front panel viewPower: Turns the unit on or off. Red LED signalson statusProbe: Inputs the plug of headstage probeGain: Selects the magnitude of amplificationfrom 200x to 20,000x in 7-positionsOffset: Offsets the output signal by +/- 1V, max.Polarity: Changes the polarity of outputOutput: BNC jack out-putting amplified signalFront panel controlsGeneral descriptionRear panel viewColor of parts may varyKation Scientific, LLC, P.O. Box 14674, Minneapolis, MN 55414 Phone/Fax: (651) 698-5167.E-mail: info@kationscientific.com Web site: www.kationscientific.comHeadstage probeSignal amplification: 10x, single-ended, AC-coupledMounting rod diameter x length: 1/4" (6.35 mm) x 4" (105 mm)Body diameter x length: 0.75" (19 mm) square x 2.05" (52 mm)Material: Nickel-plated brassCable length: 52" (132 cm)Input receptacle: SMA, spark plug type, gold-platedInput & ground sockets mate with: 0.0315"-0.0370" (0.80-0.95 mm) diametermale pinsPower In: Two identical DC power jacks for12 VDC input and output,2.1 mm x 5 mm typeGnd: Circuit ground, galvanically isolatedfrom ‘Power In’ ground (Case),2.64 mm banana jackCase: Ground (0V) of 12 VDC power input2.64 mm banana jackBack panel objectsThis exceptional headstage probe is an electrodeholder in one. Using appropriate holder adapters, allKation-made microelectrodes or third-party standardmetal electrodes can directly be plugged into theprobe. There is no need for additional electrode hold-ers. See next page for details.Also, the coaxial arrangement of the mounting rodand the SMA-type electrode input receptacle allowsan easy yet precise positioning of the recording elec-trode. The robust, nickel-plated body of the probeprovides and unsurpassed protection from electro-magnetic interference.Mounting rod CableElectrode inputGroundSMA receptacle |
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