公开(公告)号：NO301672B1

公开(公告)日：1997-11-24

申请号：NO881169

申请日：1988-03-16

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01D5/12 ,  G01D5/24 ,  G01R27/26

Abstract: A transmitter provides an output representative of a parameter. A generating circuit in the transmitter senses the parameter and provides charge packets having adjustable magnitudes to a measurement circuit. The measurement circuit measures the quantity of charge and provides a measurement signal representing the charge to a feedback circuit. The feedback circuit is controlled by the measurement signal and provides timed feedback signals to the generating means. The feedback signals control the generation and magnitude of the charge packets such that the charge coupled to the measurement circuit is finely balanced in a short measurement interval. The feedback means counts the number of charge packets provided during a measurement interval such that the numbers counted are representative of the sensed parameter.

公开(公告)号：FI96144C

公开(公告)日：1996-05-10

申请号：FI884562

申请日：1988-10-04

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01R20060101 ,  G01R11/52 ,  G01R27/26 ,  G01R29/24

公开(公告)号：FI96144B

公开(公告)日：1996-01-31

申请号：FI884562

申请日：1988-10-04

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01R20060101 ,  G01R11/52 ,  G01R27/26 ,  G01R29/24

Abstract: A measurement circuit (10) provides an output signal as a function of an input signal. The measurement circuit includes a charge generator (18) which provides packets of charge as a function of the input signal to a measurement element (34). The measurement element (34) measures the charge provided and provides a measurement signal as a function of the charge received. The measurement signal (28) is coupled to a feedback circuit (9) which couples to switches in the charge generator (18) to control production of charge packets. The feedback circuit (9) provides at least one output signal indicative of the quantity or number of charge packets provided.

公开(公告)号：HU210496B

公开(公告)日：1995-04-28

申请号：HU275587

申请日：1987-04-16

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01R20060101 ,  G01R11/52 ,  G01R27/26 ,  G01R29/24

Abstract: A measurement circuit (10) provides an output signal as a function of an input signal. The measurement circuit includes a charge generator (18) which provides packets of charge as a function of the input signal to a measurement element (34). The measurement element (34) measures the charge provided and provides a measurement signal as a function of the charge received. The measurement signal (28) is coupled to a feedback circuit (9) which couples to switches in the charge generator (18) to control production of charge packets. The feedback circuit (9) provides at least one output signal indicative of the quantity or number of charge packets provided.

公开(公告)号：NO175556C

公开(公告)日：1994-10-26

申请号：NO875401

申请日：1987-12-22

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01R20060101 ,  G01R11/52 ,  G01R27/26 ,  G01R29/24

Abstract: A measurement circuit (10) provides an output signal as a function of an input signal. The measurement circuit includes a charge generator (18) which provides packets of charge as a function of the input signal to a measurement element (34). The measurement element (34) measures the charge provided and provides a measurement signal as a function of the charge received. The measurement signal (28) is coupled to a feedback circuit (9) which couples to switches in the charge generator (18) to control production of charge packets. The feedback circuit (9) provides at least one output signal indicative of the quantity or number of charge packets provided.

公开(公告)号：ZA9207996B

公开(公告)日：1994-04-18

申请号：ZA9207996

申请日：1992-10-16

Applicant: ROSEMOUNT INC

Inventor： LOFGREN LYLE E ,  SCHULTE JOHN P ,  SEEMANN BRIAN

IPC: G01D5/24 ,  G01L9/12 ,  G01L13/06 ,  G01R27/26 ,  G01R27/28 ,  G01D ,  G08C

CPC classification number: G01L9/125

公开(公告)号：CA2119437A1

公开(公告)日：1993-04-29

申请号：CA2119437

申请日：1992-10-13

Applicant: ROSEMOUNT INC

Inventor： LOFGREN LYLE E ,  SCHULTE JOHN P ,  SEEMANN BRIAN

IPC: G01D5/24 ,  G01L9/12 ,  G01L13/06 ,  G01R27/26 ,  G01R27/28

Abstract: A two wire transmitter responsive to a pressure differential sensor includes a fixed module and a removable module. The fixed module is adapted for connection to an analog removable module having compensation capacitance MACDA or a digital removable module having compensation capacitance CDD. Capacitance compensation circuitry is included in the fixed module which includes a compensation capacitance CDM which is selected whereby MACDA equals CDD when the analog removable module and the digital removable module are calibrated. This provides a pressure transfer function which is more linearized and less susceptible to temperature variations.

公开(公告)号：MX165723B

公开(公告)日：1992-12-02

申请号：MX605787

申请日：1987-04-14

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01R20060101 ,  G01R11/52 ,  G01R27/26 ,  G01R29/24 ,  G01R3/00

Abstract: A measurement circuit (10) provides an output signal as a function of an input signal. The measurement circuit includes a charge generator (18) which provides packets of charge as a function of the input signal to a measurement element (34). The measurement element (34) measures the charge provided and provides a measurement signal as a function of the charge received. The measurement signal (28) is coupled to a feedback circuit (9) which couples to switches in the charge generator (18) to control production of charge packets. The feedback circuit (9) provides at least one output signal indicative of the quantity or number of charge packets provided.

公开(公告)号：CA1308568C

公开(公告)日：1992-10-13

申请号：CA542306

申请日：1987-07-16

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01D5/12 ,  G01D5/24 ,  G01R27/26 ,  G01R11/52

Abstract: A transmitter provides an output representative of a parameter. A generating circuit in the transmitter senses the parameter and provides charge packets having adjustable magnitudes to a measurement circuit . The measurement circuit measures the quantity of charge and provides a measurement signal representing the charge to a feedback circuit . The feedback circuit is controlled by the measurement signal and provides timed feedback signals to the generating circuit . The feedback signals control the generation and magnitude of the charge packets such that the charge coupled to the measurement circuit is finely balanced in a short measurement interval. The feedback circuit counts the number of charge packets provided during a measurement interval such that the numbers counted are representative of the sensed parameter

公开(公告)号：BR8707676A

公开(公告)日：1989-08-15

申请号：BR8707676

申请日：1987-04-16

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01R20060101 ,  G01R11/52 ,  G01R27/26 ,  G01R29/24

Abstract: A measurement circuit (10) provides an output signal as a function of an input signal. The measurement circuit includes a charge generator (18) which provides packets of charge as a function of the input signal to a measurement element (34). The measurement element (34) measures the charge provided and provides a measurement signal as a function of the charge received. The measurement signal (28) is coupled to a feedback circuit (9) which couples to switches in the charge generator (18) to control production of charge packets. The feedback circuit (9) provides at least one output signal indicative of the quantity or number of charge packets provided.