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Force measuring device and reference unit

A technology of force measuring device and reference unit, which is applied in the direction of measuring device, weighing equipment testing/calibration, weighing equipment using electromagnetic balance, etc., and can solve problems such as complex measurement

Active Publication Date: 2008-03-12
METTLER TOLEDO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, particularly complex and expensive measurements are required to suppress the so-called pop noise usually caused by semiconductors with metallic impurities in the transition region

Method used

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  • Force measuring device and reference unit
  • Force measuring device and reference unit
  • Force measuring device and reference unit

Examples

Experimental program
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Embodiment Construction

[0044] Figure 1 shows a balance 1000 operating according to the principle of electromagnetic force compensation with a measuring unit 100 which can be equipped with one compensation coil 1 or two compensation coils 1a, 1b, the compensation coils 1a, 1b is used to generate magnetic fields in opposite directions with a time offset in push / pull mode of operation.

[0045] The mechanical part of a scale 1000 shown schematically in FIG. On the parallelogram leg 104, a cantilever 1041 is formed on the parallelogram leg 104 and serves to receive the load F MO . Two parallelogram legs 103 and 104 are connected to two guide members 101 and 102 by flexible pivots 110 . A magnet system 2 is attached to the support arm 1032 extending from the stationary parallelogram leg 103, the magnet system 2 comprising a permanent magnet 21 having a pole plate 22 and a cup-shaped magnetic field guide 23, wherein the pole plate 22 is placed on the permanent magnet. On top of the magnet 21, a cup-sha...

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Abstract

A force-measuring device (1000) includes a measuring unit (100) and a reference unit (100R), wherein the reference unit (100R) is used to deliver a reference quantity, a reference current (IREF) or a reference voltage (UREF), by means of which the force (FMO) of a measurement object which is to be determined can be measured by the measuring unit (100). According to the invention, the reference unit (100) is a force-measuring device which is loaded with a reference mass (mREF) and which in accordance with the principle of electromagnetic force compensation generates a reference current (IREF) that can be regulated by means of a measuring-and regulating device (3R, 4R) in such a way that in a first reference coil (1R;1Ra) which is held by a reference lever (105R), the reference current (IREF) generates a magnetic field which cooperates with the magnetic field of a reference magnet (2R;2-2R) in such a way that a magnetic force is brought to bear on the reference lever (105R), wherein the force (FREF) of the reference mass (mREF) which is likewise acting on the reference lever can be compensated by said magnetic force.

Description

technical field [0001] The invention relates to a force measuring device, in particular to a scale (balance) and a reference unit. Background technique [0002] The measuring accuracy of a force measuring device is influenced by many factors, which are described in reference [2]: "Wgefibel" (Weighing Primer), Mettler-Toledo GmbH, April 2001, the force measuring device Examples are scales based on electromagnetic force compensation or strain gauge technology (see reference [1]: "Build your Quality on a Solid Foundation!", company publication, Mettler-Toledo GmbH, January 2001, pp. 14-15). [0003] Scales of various types are particularly susceptible to disturbances due to mechanical influences such as vibrations or shocks, and are therefore provided with filters for removing disturbance-related signal parts. For example, in reference [3]: US 2004 / 0088342A1 and reference [4]: ​​US 6,271,484B1, methods are described in which the signals produced by the measuring sensors of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01G23/10G01G7/02G01G7/04
CPCG01G7/04G01G23/01G01G23/10
Inventor D·雷伯H-R·布克哈德
Owner METTLER TOLEDO INC
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