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131 Business Park Loop ,
Sequim ,
Washington 98382
USA
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Model 3100 - Intracellular Electrometer

Model 3100 - Intracellular Electrometer

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The Model 3100 Intracellular Electrometer is a simple to use low cost full function intracellular amplifier. Research quality recordings made possible by an instrument you can purchase on a teaching budget. The amplifiers current compensation circuit includes a dual-transient control that provides extremely precise adjustments to transient suppression during membrane recordings. Its DC balance control eliminates the need for an external bridge or a differential input oscilloscope. The DC offset control can eliminate up to ±1V of offset. An internal square-wave generator supplies a 100Hz current pulse to determine electrode resistance. Capacity compensation can adjust up to 35pF of electrode capacitance. Additional stray capacitance can be reduced by using the driven shield connector on the head stage probe.

Details

The Model 3100’s uses an advanced capacitance “Ringer” for clearing electrode tips and enhancing the membrane penetration of neurons. The Ringer’s amplitude and frequency of the pulsed oscillations sent to the electrode can be adjusted. Low pass filtering combined with a line frequency notch filter are available for the researcher to diminish extraneous frequencies and external line noise.

The current injection system allows for both internally generated and externally generated current. This current can be set for continuous or momentary injection. The sum of the current can be gated by an external TTL logic signal source.

The small size of the amplifier and its remote power supply offer the advantage of placing the amplifier near to the experimental set up. For example, the amplifier can be placed within a Faraday cage with minimal power-line interference.

Specifications

  • Noise (10 Hz - 50 kHz): 18 µV, rms shorted; < 350 µV, 20 MΩ source
  • Input impedance: 1013 Ω; capacitance adjustable to zero
  • Bias current: Adjustable to zero
  • Voltage gain: x1 and x10
  • Capacity Compensation: -4 pF–35 pF
  • DC Offset: ±1 V
  • Max internal current: 1 µA
  • External current: 100 nA/V; 10 V maximum
  • Electrode test: 100 Hz, 10 nA; (i.e. 10 mV/M? electrode resistance)
  • Ringer: 0 - 10 V biphasic, 2 - 8 kHz
  • External power supply for low noise
  • Custom settings available—call for details!

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