A microprocessor controlled hand held portable electronic pipette
A microprocessor controlled hand held portable electronic pipette is disclosed, comprising a hand holdable housing supporting a linear actuator for driving a plunger lengthwise in a cylinder to aspirate and dispense fluid into and from a pipette tip extending from the housing, the linear actuator be...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | A microprocessor controlled hand held portable electronic pipette is disclosed, comprising a hand holdable housing supporting a linear actuator for driving a plunger lengthwise in a cylinder to aspirate and dispense fluid into and from a pipette tip extending from the housing, the linear actuator being powered by a battery contained in the housing or an external power source and comprising a stepper motor with current receiving windings for receiving drive signals for electromagnetically driving a rotor to impart the lengthwise movement to the plunger at controlled speeds through a series of microsteps, the pipette being characterized in that it further includes a control circuit for the pipette including a user controllable microprocessor powered by the battery or external power source and programmed to generate the drive signals for the stepper motor which are pulse width modulated signals derived by the microprocessor and having duty cycles corresponding to different microstep positions for the stepper motor. |
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