Title:
IMPROVEMENTS IN OR RELATING TO TRANSDUCER INTERFACES
Document Type and Number:
WIPO Patent Application WO1987003436
Kind Code:
A3
Abstract:
An addressable transducer interface which may be associated with a particular electrical transducer, comprises means (107) for storing correction data for the correction of errors as herein defined relating to that transducer so that on addressing of the interface by external control means, the correction data may be transmitted to the control means together with measurement data from the transducer. The storing means is arranged to store said correction data in digital form.The interface includes an analogue to digital converter circuit which comprises means (305, 306) for changing a capacitor (303) of a given value from a source of constant current of a given value, voltage comparator means (310, 311, 3121 arranged to compare the value of an analogue voltage signal on an input with the charge voltage in said capacitor, a digital counter (301) arranged to start a count of cycles of a reference frequency when charging the capacitor is commenced from zero charge, a shift register (316, 317, 318) and a loading circuit arranged to cause the instantaneous count in said counter to be loaded into said shift register at the time when the charge in said capacitor is detected by said comparator as being equal to the value of the analogue signal.
Inventors:
GIMBLETT CHRISTOPHER FRANCIS (GB)
Application Number:
PCT/GB1986/000705
Publication Date:
July 16, 1987
Filing Date:
November 19, 1986
Export Citation:
Assignee:
DRALLIM IND (GB)
GIMBLETT CHRISTOPHER FRANCIS (GB)
GIMBLETT CHRISTOPHER FRANCIS (GB)
International Classes:
G01D3/02; G01D3/028; G01D5/12; H03M1/00; H03M1/06; (IPC1-7): H03M1/06; H03M1/56
Domestic Patent References:
| WO1982003121A1 | 1982-09-16 |
Foreign References:
| DE3411306A1 | 1984-10-11 | |||
| GB2065890A | 1981-07-01 | |||
| US3815100A | 1974-06-04 | |||
| US4190800A | 1980-02-26 |
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