A-M Systems 3000 Gebrauchsanweisung - Seite 11

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connector is less than ±10 V, otherwise higher and/or lower portions of the signal

may appear cutoff or flattened.

Stimulating

The

switch should be placed in the

MODE

monitored by measuring the voltage (V) across an internal, fixed resistor (R = 100 Ω)

in series with the electrodes. Since I=V/R and R is known, the voltage is a measure of

the stimulus current. The internal resistor is in series with the indifferent lead (

so that excessive voltages do not appear at the Probe Amplifier inputs. Therefore, to

ensure that the current in the indifferent lead is equal to and opposite of that in the

active lead, only isolated stimulus sources should be used. An added benefit of

isolated stimulus sources is that they produce less stimulus artifact than ground

referenced sources. The Positive Conductor of the Stimulus connector (center pin) is

connected through the Probe to the active electrode lead, while the Negative

Conductor (outside ring of the BNC) is connected to the indifferent electrode lead.

When an isolated stimulator is used the

function properly

Mounting Micropipettes

The easiest way to use a micropipette as an electrode is to place the micropipette in

a micropipette holder with a 2mm pin. It will fit firmly into the headstage (+) input

connector.

Mounting the Head stage in a Micromanipulator

The Head stage should be clamped in the manipulator by means of the mounting rod

supplied. The mounting rod can be screwed into the cable end of the head stage for in-

line mounting.

A-M Systems

STIM

PROBE-

131 Business Park Loop, P.O. Box 850 Carlsborg, WA 98324

Telephone: 800-426-1306 * 360-683-8300 * FAX: 360-683-3525

E-mail: [email protected] * Website:

position. Stimulation current (I) is

connector must be grounded to

http://www.a-msystems.com

)

PROBE-