Ultra Quiet Intracellular Amplifier

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

Features

• Driven guard shield
• Test port
• Ground port
• Portable
• Remote headstage

Benefits

• Cost effective
• Battery powered
• Capacitance compensation

Applications

• Measure intracellular action potentials

 

Electro 705 comes with 1 each of Microelectrode Holder : MEH1SF10, MEH1SF12, MEH1SF15 and MEH1SF20. The RC1T is recommended for reference electrode.

Electro 705, a battery operated, low noise, wide band electrometer preamplifier, is designed for intracellular voltage measurement. Two 705’s can be linked together to form a high impedance differential electrometer pair. Each instrument includes a miniature gold plated active probe to which a microelectrode can be attached using the WPI microelectrode holder supplied.

Remote headstage

Easily mounted in any manipulator, this compact probe, containing the first stage of amplification, includes a microelectrode holder, which plugs directly into the probe input.

Battery power

Four 9V alkaline batteries (included) power the Electro 705 for approximately 500 hours giving a clean, low noise source of power, making the Electro 705 the quietest amplifier available. Batteries can be easily tested by the press of a button.

Capacitance compensation

Corrects for loss of rise time caused by the presence of electrode capacity. Up to 50 pF of electrode shunt capacity may be neutralized.

Driven guard shield

Stray capacitance can be further reduced by placing the driven guard shield (included) over the microelectrode holder at the input end of the probe.

Test features

A Tickler Circuit offers a momentary oscillation that helps achieve cell penetration. The Electo 705 provides a 1 nA electrode test current. Electrode resistance is monitored at the 1X output as a voltage (1 mV/M). The Probe Test Port allows the convenience of testing the amplifier's intrinsic noise and gain without cumbersome external test hookups. Head stage leakage current can also be adjusted with minimum effort. The Baseline Position Control adds or subtracts up to 300 mV to the headstage output, allowing artifact voltages such as liquid junction potentials to be nulled prior to recording.

Differential output

Two Electro 705 units can be connected in tandem to create an optional differential amplifier probe system.

Electro705 Instruction Manual

Input Impedance	1012 Ω, shunted by 1pF
Output Impedance	100 Ω, both outputs
Gain	X1: ±0.1%
Input Voltage Range	±5 V
Risetime	15 µs, 10-90%
Noise Level	500 μV peak-to-peak*
Input Capacitance Compensation	0-50 pF
Gate Leakage Curent	±10 pA, adjustable to zero
Electrode Resistance Test	1 mV/MΩ
DC Positioning	±300 mV
Common Mode Rejection	>104 (in differential mode)
Power	Four 9 V alkaline batteries, supplied
Dimensions	8.5 x 3.5 x 2.2 in. (22 x 9 x 6 cm)
Shipping Weight	5 lb. (2.3 kg)