GB1523301A - Compensation of differential temperature drift - Google Patents

Compensation of differential temperature drift

Info

Publication number
GB1523301A
GB1523301A GB838075A GB838075A GB1523301A GB 1523301 A GB1523301 A GB 1523301A GB 838075 A GB838075 A GB 838075A GB 838075 A GB838075 A GB 838075A GB 1523301 A GB1523301 A GB 1523301A
Authority
GB
United Kingdom
Prior art keywords
temperature
resistors
housing
compensation
change
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB838075A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Avery Weigh Tronix Ltd
Original Assignee
W&T Avery Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by W&T Avery Ltd filed Critical W&T Avery Ltd
Priority to GB838075A priority Critical patent/GB1523301A/en
Publication of GB1523301A publication Critical patent/GB1523301A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/1414—Arrangements for correcting or for compensating for unwanted effects
    • G01G3/1418—Arrangements for correcting or for compensating for unwanted effects for temperature variations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
    • G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
    • G01D3/0365—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves the undesired influence being measured using a separate sensor, which produces an influence related signal

Abstract

1523301 Temperature compensation for electronic instruments W & T AVERY Ltd 26 Feb 1976 [28 Feb 1975] 8380/75 Heading G1N The output of an electronic instrument mounted in a housing is compensated for the effects of temperature gradients existing in the housing. An electronic weighing machine of the type shown in Patent No. 1263182 and including a platform supported by a load receiving member mounted in cantilever fashion by three flexure strips forming a parallelogrammic linkage, one of which strips carries strain gauges has the strips enclosed within a housing which also contains a power supply and digital display circuitry. The temperature in the housing due to the electrical equipment is not uniform and can result in a change in the geometric configuration of the transducer resulting in erroneous results. To compensate for these effects a pair of temperature sensitive elements such as thermistors, thermocouples or temperature dependant resistors are mounted at spaced apart locations in the housing and connected in series. Two such resistors in one embodiment have equal temperature coefficients so that the change in voltage at the junction thereof is indicative of the temperature difference between the locations whereas changes in absolute temperature have no effect. The junction point is connected via a resistive network to the non-inverting input of a unity gain differential amplifier to the inverting input of which is applied the transducer output. By adjusting the resistive network the magnitude of the change due to temperature difference is made equal and opposite to the change occurring in the signal derived from the transducer due to temperature difference and compensation is achieved. Compensation signals dependant on both differential and absolute temperature may be produced if resistors of unequal temperature coefficients and/or unequal value are used. The temperature sensitive resistors may be connected in a bridge circuit. A plurality of pairs of resistors may be used located at different positions.
GB838075A 1976-02-26 1976-02-26 Compensation of differential temperature drift Expired GB1523301A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB838075A GB1523301A (en) 1976-02-26 1976-02-26 Compensation of differential temperature drift

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB838075A GB1523301A (en) 1976-02-26 1976-02-26 Compensation of differential temperature drift

Publications (1)

Publication Number Publication Date
GB1523301A true GB1523301A (en) 1978-08-31

Family

ID=9851448

Family Applications (1)

Application Number Title Priority Date Filing Date
GB838075A Expired GB1523301A (en) 1976-02-26 1976-02-26 Compensation of differential temperature drift

Country Status (1)

Country Link
GB (1) GB1523301A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018001886A1 (en) * 2016-06-27 2018-01-04 Bizerba SE & Co. KG Load cell having compensation of temperature differences

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018001886A1 (en) * 2016-06-27 2018-01-04 Bizerba SE & Co. KG Load cell having compensation of temperature differences
US11022481B2 (en) 2016-06-27 2021-06-01 Bizerba SE & Co. KG Load cell having compensation of temperature differences

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee
PCNP Patent ceased through non-payment of renewal fee
PCNP Patent ceased through non-payment of renewal fee

Free format text: FOR 1523301 READ 1524301 IN JOURNAL 4988 PAGE 3284