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Electronic Calibration of Glide Head Transducer

IP.com Disclosure Number: IPCOM000061902D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Smith, GJ: AUTHOR

Abstract

The block diagram in Fig. 1 shows how the calibration circuit is used in conjunction with other hardware to perform a calibration of a piezoelectric (PZT) transducer. The calibration is performed by first measuring the electromechanical response of PZT transducer to a given electrical stimulus. The resulting PZT signal amplitude is compared to a standard response for that same stimulus. A correction factor for the PZT sensitivity is then applied when the glide head/transducer is used for magnetic disk glide testing.

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Electronic Calibration of Glide Head Transducer

The block diagram in Fig. 1 shows how the calibration circuit is used in conjunction with other hardware to perform a calibration of a piezoelectric (PZT) transducer. The calibration is performed by first measuring the electromechanical response of PZT transducer to a given electrical stimulus. The resulting PZT signal amplitude is compared to a standard response for that same stimulus. A correction factor for the PZT sensitivity is then applied when the glide head/transducer is used for magnetic disk glide testing.

In Fig. 2, the components of the calibration circuit are shown. A timing circuit 2 is used to gate a pulse generator circuit 1 and also control an analog switch 3. The timing circuit 2 ensures that the charge amplifier 5 is disconnected from the PZT transducer 4 when the transducer is being electrically stimulated via a switch 6 controlled by pulse gener 1. After the electrical stimulation, the switch 7 connecting the PZT transducer 4 to charge amplifier 5 is opened. Thus the PZT charge, which has resulted from the stimulus is amplified and available for measurement, as a voltage, at the output of amplifier 5.

Disclosed anonymously.

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