Each system maintains constant the electrical resistance measured between the low resistance pipette fluid, and the fluid being measured by generating an equal and opposing pressure which is measured by standard pressure transducers (supplied by the user).

Specially developed circuitry matched to the hydraulic properties of the glass micropipettes allows one to measure pressures through tip openings as small as 1/2 micrometer ID, with high resolution and fidelity.

Frequency response linear from DC to 30Hz.

Linear output throughout the measuring range. Measures pressures to 200 mm Hg.

Can be utilized with glass pipettes with inside diameter tips ranging from .5 to 5 micrometer. Can also be used with a single pipette for single site measurements.

Continuous monitoring of system condition during operation, including simultaneous internal video presentation of pipette resistance, bridge balance, bridge resistance, and output power.

BNC video output connectors are provided so that the video presentation can be displayed on other monitors.

A special quadrature phase feedback system is incorporated to automatically correct for phase errors so as to maintain servo-null phase detector operation at maximum sensitivity, eliminating the need for manual adjustment for stray capacity.

1. Input preamplifier with automatic stray capacitance compensation feature.
2. Processing amplifiers.
3. Electro-hydraulic voltage to pressure converters.
4. 4 micro-cannulae holders.
5. 2 Test chambers for micro pipettes.
6. Complete operating instructions including electronic and hydraulic checkout.